diff --git a/.gitignore b/.gitignore
index d3d18f1..6b51961 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,6 +26,5 @@ lighthouse/*
 target/
 **/*.txt
 **/*.rs.bk
-Cargo.lock
 files/tools/*/bin
 .mypy_cache/
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 90fed9a..925510b 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -5,31 +5,38 @@ repos:
 
 # Python
 # TODO remove branch paths, should use specific revisions
-  - repo: https://github.com/psf/black
-    rev: 19.10b0
-    hooks:
-      - id: black
-        name: python-black
-
+#  - repo: https://github.com/psf/black
+#    rev: 20.8b1
+#    hooks:
+#      - id: black
+#        name: python-black
+#
 #  - repo: https://github.com/asottile/seed-isort-config
 #    rev: v1.9.3
 #    hooks:
 #      - id: seed-isort-config
 #        name: seed-isort-config
-
-  - repo: https://github.com/timothycrosley/isort
-    rev: 4.3.21
-    hooks:
-      - id: isort
-        name: python-isort
-        additional_dependencies: [toml]
+#
+#  - repo: https://github.com/timothycrosley/isort
+#    rev: 5.5.3
+#    hooks:
+#      - id: isort
+#        name: python-isort
+#        additional_dependencies: [toml]
 
 # Rust
   - repo: https://github.com/doublify/pre-commit-rust
-    rev: 55f347186aec7f2a4ec13c31effdb4b26512f2bc
+    rev: v1.0
     hooks:
       - id: fmt
-        name: rust-fmt
+        name: cargo-fmt-bf2
+        args: [--manifest-path, beaconfuzz_v2/Cargo.toml, --]
+      - id: fmt
+        name: cargo-fmt-eth2fuzz
+        args: [--manifest-path, eth2fuzz/Cargo.toml, --]
+      - id: fmt
+        name: cargo-fmt-eth2diff
+        args: [--manifest-path, eth2diff/Cargo.toml, --]
 # TODO currently doesn't work if Cargo.toml isn't in the root directory
 # Can have a hook that takes in Cargo.toml files and uses manifest-path for each
 #     - id: cargo-check
@@ -69,7 +76,7 @@ repos:
 
 # Shell
   - repo: https://github.com/jumanjihouse/pre-commit-hooks
-    rev: 1.11.0
+    rev: 2.1.4
     hooks:
         # These need external installation
         # TODO specify via additional_dependencies ?
@@ -78,8 +85,8 @@ repos:
         args: ['-l', '-i', '4', '-ci', '-w']
 
 # C, C++ etc
-  - repo: https://gitlab.com/daverona-env/pre-commit-cpp
-    rev: 0.6.0
+  - repo: https://gitlab.com/daverona/pre-commit/cpp
+    rev: 0.8.0
     hooks:
     - id: clang-format
     - id: cpplint
@@ -100,7 +107,7 @@ repos:
 
 # Misc/General
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v2.4.0
+    rev: v3.2.0
     hooks:
       - id: trailing-whitespace
       - id: end-of-file-fixer
diff --git a/beaconfuzz_v2/Cargo.lock b/beaconfuzz_v2/Cargo.lock
new file mode 100644
index 0000000..1c120a5
--- /dev/null
+++ b/beaconfuzz_v2/Cargo.lock
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+checksum = "841a6d1c35c6f596ccea1f82504a192a60378f64b3bb0261904ad8f2f5657556"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.67"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93b162580e34310e5931c4b792560108b10fd14d64915d7fff8ff00180e70092"
+
+[[package]]
+name = "web-sys"
+version = "0.3.44"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dda38f4e5ca63eda02c059d243aa25b5f35ab98451e518c51612cd0f1bd19a47"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "which"
+version = "3.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d011071ae14a2f6671d0b74080ae0cd8ebf3a6f8c9589a2cd45f23126fe29724"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "yaml-rust"
+version = "0.4.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "39f0c922f1a334134dc2f7a8b67dc5d25f0735263feec974345ff706bcf20b0d"
+dependencies = [
+ "linked-hash-map",
+]
+
+[[package]]
+name = "zeroize"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3cbac2ed2ba24cc90f5e06485ac8c7c1e5449fe8911aef4d8877218af021a5b8"
+dependencies = [
+ "zeroize_derive",
+]
+
+[[package]]
+name = "zeroize_derive"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de251eec69fc7c1bc3923403d18ececb929380e016afe103da75f396704f8ca2"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
diff --git a/beaconfuzz_v2/Cargo.toml b/beaconfuzz_v2/Cargo.toml
index c378dc4..38399fd 100644
--- a/beaconfuzz_v2/Cargo.toml
+++ b/beaconfuzz_v2/Cargo.toml
@@ -22,13 +22,16 @@ types = { path = "../../lighthouse/consensus/types" }
 #prysm = { path = "libs/prysm" }
 # lighthouse = { path = "libs/lighthouse" }
 eth2clientsfuzz = { path = "libs/eth2clientsfuzz" }
+teku = { path = "libs/teku" }
 
 [workspace]
 members = [
 	"libs/prysm",
 	"libs/nimbus",
-	"libs/lighthouse", 
-	"libs/eth2clientsfuzz"
+	"libs/lighthouse",
+	"libs/eth2clientsfuzz",
+	"libs/bfuzz-jni",
+	"libs/teku",
 ]
 
 
diff --git a/beaconfuzz_v2/README.md b/beaconfuzz_v2/README.md
index d0c70bf..75cd6a8 100644
--- a/beaconfuzz_v2/README.md
+++ b/beaconfuzz_v2/README.md
@@ -38,7 +38,7 @@ Clone the repository of nimbus and compile the nimbus fuzzing library:
 ```
 git clone https://github.com/status-im/nim-beacon-chain --branch devel
 cd nim-beacon-chain
-NIMFLAGS="-d:disableLTO" make libnfuzz.a libnfuzz.so
+NIMFLAGS="-d:disableLTO" make libnfuzz.a
 ```
 
 Finally, set the following variable with the current path of nimbus:
@@ -65,6 +65,70 @@ Set the following variable with the current path of prysm:
 export CARGO_PRYSM_DIR=beacon-fuzz/beaconfuzz_v2/libs
 ```
 
+### teku setup
+
+Install Java 11 or greater
+
+e.g.
+
+```console
+$ sudo apt install openjdk-11-jdk
+```
+
+Ensure `JAVA_HOME` is set.
+
+(If `echo $JAVA_HOME` is displays no output) it should probably be set to something like:
+
+```console
+$ export JAVA_HOME="$(dirname $(dirname $(readlink -f $(command -v java))))"
+```
+
+Probably want to add it to your `.profile`
+(This is `/usr/lib/jvm/java-11-openjdk-amd64` in ubuntu)
+
+Add `$JAVA_HOME/lib/server` to your runtime library path via *either* of the following methods:
+
+**via LD_LIBRARY_PATH**
+
+```console
+$ export LD_LIBRARY_PATH="$JAVA_HOME/lib/server"
+```
+
+This needs to be set at runtime - i.e. whenever you want to run the teku fuzzer, not when you're building it.
+
+Or
+
+**via ldconfig**
+
+```console
+$ echo "$JAVA_HOME/lib/server" >> /etc/ld.so.conf.d/java.conf
+$ sudo ldconfig
+```
+
+<!--
+Also adding this?
+$ echo "$JAVA_HOME/lib" >> /etc/ld.so.conf.d/java.conf
+-->
+
+
+Clone teku repository:
+```console
+$ git clone https://github.com/PegaSysEng/teku.git
+```
+
+Set `BFUZZ_TEKU_DIR` to the root teku directory:
+```console
+$ BFUZZ_TEKU_DIR="$(realpath -e path/to/teku)" && export BFUZZ_TEKU_DIR
+```
+
+Build teku:
+```console
+$ cd teku
+$ ./gradlew installDist -x test --stacktrace
+$ ./gradlew fuzz:build
+```
+
+
 ### Beaconfuzz_v2 compilation
 
 Compile the project using the Makefile
@@ -82,9 +146,9 @@ cargo +nightly install honggfuzz
 Compile and run the fuzzers:
 ```
 make fuzz_*
-fuzz_attestation               fuzz_block                     fuzz_proposer_slashing       
+fuzz_attestation               fuzz_block                     fuzz_proposer_slashing
 fuzz_attestation-struct        fuzz_block-struct              fuzz_proposer_slashing-struct
-fuzz_attester_slashing         fuzz_deposit                   fuzz_voluntary_exit          
+fuzz_attester_slashing         fuzz_deposit                   fuzz_voluntary_exit
 fuzz_attester_slashing-struct  fuzz_deposit-struct            fuzz_voluntary_exit-struct
 ```
 
@@ -94,4 +158,4 @@ there is two differents kind of fuzzing targets:
 
 <!---
 RUSTFLAGS='-L /home/scop/Documents/consulting/sigmaprime/prysm/pfuzz/ -L /home/scop/Documents/consulting/sigmaprime/nim-beacon-state/build/ ' make fuzz_block-struct
- -->
\ No newline at end of file
+ -->
diff --git a/beaconfuzz_v2/fuzz/Cargo.toml b/beaconfuzz_v2/fuzz/Cargo.toml
index 94b476a..e2519fb 100644
--- a/beaconfuzz_v2/fuzz/Cargo.toml
+++ b/beaconfuzz_v2/fuzz/Cargo.toml
@@ -21,6 +21,7 @@ types = { path = "../../../lighthouse/consensus/types", features = ["arbitrary-f
 # local library
 lighthouse = { path = "../libs/lighthouse" }
 eth2clientsfuzz = { path = "../libs/eth2clientsfuzz" }
+teku = { path = "../libs/teku" }
 
 [patch.crates-io]
 # Needed to provide paths to some relevant dependencies
diff --git a/beaconfuzz_v2/fuzz/fuzz_targets/struct_attestation.rs b/beaconfuzz_v2/fuzz/fuzz_targets/struct_attestation.rs
index 2066177..7cf1494 100644
--- a/beaconfuzz_v2/fuzz/fuzz_targets/struct_attestation.rs
+++ b/beaconfuzz_v2/fuzz/fuzz_targets/struct_attestation.rs
@@ -17,6 +17,7 @@ use std::process;
 
 use rand::seq::SliceRandom;
 use rand::thread_rng;
+use teku;
 
 /// List file in folder and return list of files paths
 #[inline(always)]
@@ -134,6 +135,7 @@ lazy_static! {
     static ref INIT_OK: bool = {
         // initialize client only once
         eth2clientsfuzz::initialize_clients(true);
+        teku::init_teku(true, teku::FuzzTarget::Attestation);
         true
     };
 }
diff --git a/beaconfuzz_v2/fuzz/fuzz_targets/struct_attester_slashing.rs b/beaconfuzz_v2/fuzz/fuzz_targets/struct_attester_slashing.rs
index d4fdaa2..5cac4f3 100644
--- a/beaconfuzz_v2/fuzz/fuzz_targets/struct_attester_slashing.rs
+++ b/beaconfuzz_v2/fuzz/fuzz_targets/struct_attester_slashing.rs
@@ -135,6 +135,7 @@ lazy_static! {
     static ref INIT_OK: bool = {
         // initialize client only once
         eth2clientsfuzz::initialize_clients(true);
+        teku::init_teku(true, teku::FuzzTarget::AttesterSlashing);
         true
     };
 }
diff --git a/beaconfuzz_v2/fuzz/fuzz_targets/struct_block.rs b/beaconfuzz_v2/fuzz/fuzz_targets/struct_block.rs
index 75b0669..3c04685 100644
--- a/beaconfuzz_v2/fuzz/fuzz_targets/struct_block.rs
+++ b/beaconfuzz_v2/fuzz/fuzz_targets/struct_block.rs
@@ -135,6 +135,7 @@ lazy_static! {
     static ref INIT_OK: bool = {
         // initialize client only once
         eth2clientsfuzz::initialize_clients(true);
+        teku::init_teku(true, teku::FuzzTarget::Block);
         true
     };
 }
diff --git a/beaconfuzz_v2/fuzz/fuzz_targets/struct_block_header.rs b/beaconfuzz_v2/fuzz/fuzz_targets/struct_block_header.rs
index 7d857fa..1967836 100644
--- a/beaconfuzz_v2/fuzz/fuzz_targets/struct_block_header.rs
+++ b/beaconfuzz_v2/fuzz/fuzz_targets/struct_block_header.rs
@@ -6,7 +6,7 @@ use lazy_static::lazy_static;
 use walkdir::WalkDir;
 
 use ssz::{Decode, Encode};
-use types::{BeaconState, MainnetEthSpec, BeaconBlock};
+use types::{BeaconBlock, BeaconState, MainnetEthSpec};
 
 use std::fs::File;
 use std::fs::OpenOptions;
@@ -135,6 +135,7 @@ lazy_static! {
     static ref INIT_OK: bool = {
         // initialize client only once
         eth2clientsfuzz::initialize_clients(true);
+        teku::init_teku(true, teku::FuzzTarget::BlockHeader);
         true
     };
 }
diff --git a/beaconfuzz_v2/fuzz/fuzz_targets/struct_deposit.rs b/beaconfuzz_v2/fuzz/fuzz_targets/struct_deposit.rs
index 070e5b2..8233f9e 100644
--- a/beaconfuzz_v2/fuzz/fuzz_targets/struct_deposit.rs
+++ b/beaconfuzz_v2/fuzz/fuzz_targets/struct_deposit.rs
@@ -135,6 +135,7 @@ lazy_static! {
     static ref INIT_OK: bool = {
         // initialize client only once
         eth2clientsfuzz::initialize_clients(true);
+        teku::init_teku(true, teku::FuzzTarget::Deposit);
         true
     };
 }
diff --git a/beaconfuzz_v2/fuzz/fuzz_targets/struct_proposer_slashing.rs b/beaconfuzz_v2/fuzz/fuzz_targets/struct_proposer_slashing.rs
index 77717aa..96ba18f 100644
--- a/beaconfuzz_v2/fuzz/fuzz_targets/struct_proposer_slashing.rs
+++ b/beaconfuzz_v2/fuzz/fuzz_targets/struct_proposer_slashing.rs
@@ -135,6 +135,7 @@ lazy_static! {
     static ref INIT_OK: bool = {
         // initialize client only once
         eth2clientsfuzz::initialize_clients(true);
+        teku::init_teku(true, teku::FuzzTarget::ProposerSlashing);
         true
     };
 }
diff --git a/beaconfuzz_v2/fuzz/fuzz_targets/struct_voluntary_exit.rs b/beaconfuzz_v2/fuzz/fuzz_targets/struct_voluntary_exit.rs
index 9be5c78..81db55a 100644
--- a/beaconfuzz_v2/fuzz/fuzz_targets/struct_voluntary_exit.rs
+++ b/beaconfuzz_v2/fuzz/fuzz_targets/struct_voluntary_exit.rs
@@ -135,6 +135,7 @@ lazy_static! {
     static ref INIT_OK: bool = {
         // initialize client only once
         eth2clientsfuzz::initialize_clients(true);
+        teku::init_teku(true, teku::FuzzTarget::VoluntaryExit);
         true
     };
 }
diff --git a/beaconfuzz_v2/libs/bfuzz-jni/Cargo.toml b/beaconfuzz_v2/libs/bfuzz-jni/Cargo.toml
new file mode 100644
index 0000000..8a6dca9
--- /dev/null
+++ b/beaconfuzz_v2/libs/bfuzz-jni/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "bfuzz-jni"
+version = "0.1.0"
+authors = ["Nathaniel Jensen <nathaniel at sigmaprime dot io>"]
+edition = "2018"
+description = "Provides interface to Java beacon-fuzz harnesses via JNI"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+
+[build-dependencies]
+cc = "1.0.59"
+bindgen = "0.55.1"
diff --git a/beaconfuzz_v2/libs/bfuzz-jni/build.rs b/beaconfuzz_v2/libs/bfuzz-jni/build.rs
new file mode 100644
index 0000000..25e0a2a
--- /dev/null
+++ b/beaconfuzz_v2/libs/bfuzz-jni/build.rs
@@ -0,0 +1,39 @@
+use bindgen;
+
+use std::env;
+use std::path::PathBuf;
+
+fn main() {
+    // TODO does it matter where I put these?
+    // TODO use clang?
+    println!("cargo:rerun-if-changed=src/bfuzzjni.c");
+    println!("cargo:rerun-if-changed=src/bfuzzjni.h");
+
+    let jvm_home = PathBuf::from(env::var("JAVA_HOME").expect("JAVA_HOME not set"));
+    println!("cargo:rustc-link-search={}", jvm_home.join("lib").display());
+    println!(
+        "cargo:rustc-link-search={}",
+        jvm_home.join("lib/server").display()
+    );
+    println!("cargo:rustc-link-lib=jvm");
+    // TODO need the equiv of -Wl,-R"${JAVA_HOME}/lib/server"?
+    // NOTE assumes a linux system here.
+    cc::Build::new()
+        .file("src/bfuzzjni.c")
+        .include("src")
+        .include(jvm_home.join("include"))
+        .include(jvm_home.join("include/linux"))
+        .compile("bfuzzjni");
+
+    let bindings = bindgen::Builder::default()
+        .header("src/bfuzzjni.h")
+        .parse_callbacks(Box::new(bindgen::CargoCallbacks))
+        .generate()
+        .expect("Unable to generate bindings");
+
+    // Write the bindings to the $OUT_DIR/bindings.rs file.
+    let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
+    bindings
+        .write_to_file(out_path.join("bindings.rs"))
+        .expect("Couldn't write bindings!");
+}
diff --git a/beaconfuzz_v2/libs/bfuzz-jni/src/DummyFuzzUtil.class b/beaconfuzz_v2/libs/bfuzz-jni/src/DummyFuzzUtil.class
new file mode 100644
index 0000000..263c733
Binary files /dev/null and b/beaconfuzz_v2/libs/bfuzz-jni/src/DummyFuzzUtil.class differ
diff --git a/beaconfuzz_v2/libs/bfuzz-jni/src/DummyFuzzUtil.java b/beaconfuzz_v2/libs/bfuzz-jni/src/DummyFuzzUtil.java
new file mode 100644
index 0000000..6e0e83a
--- /dev/null
+++ b/beaconfuzz_v2/libs/bfuzz-jni/src/DummyFuzzUtil.java
@@ -0,0 +1,30 @@
+import java.util.Optional;
+
+// TODO convert to testdata
+
+public class DummyFuzzUtil {
+  // NOTE: alternatively could also have these all in separate classes, which implement a
+  // "FuzzHarness" interface
+
+  // Size of ValidatorIndex returned by shuffle
+  private static final int OUTPUT_INDEX_BYTES = Long.BYTES;
+
+  private final boolean disable_bls;
+
+  // NOTE: this uses primitive values as parameters to more easily call via JNI
+  public DummyFuzzUtil(final boolean useMainnetConfig, final boolean disable_bls) {
+    initialize(useMainnetConfig, disable_bls);
+    this.disable_bls = disable_bls;
+  }
+
+  public static void initialize(final boolean useMainnetConfig, final boolean disable_bls) {
+    System.out.println("Initializing in Java");
+  }
+
+  public Optional<byte[]> fuzzAttestation(final byte[] input) {
+    System.out.println("Calling Java fuzzAttestation!");
+    //Just return the input
+    //return Optional.of(input);
+    return Optional.empty();
+  }
+}
diff --git a/beaconfuzz_v2/libs/bfuzz-jni/src/bfuzzjni.c b/beaconfuzz_v2/libs/bfuzz-jni/src/bfuzzjni.c
new file mode 100644
index 0000000..02c3feb
--- /dev/null
+++ b/beaconfuzz_v2/libs/bfuzz-jni/src/bfuzzjni.c
@@ -0,0 +1,405 @@
+#include "bfuzzjni.h"
+
+#include <inttypes.h>
+#include <jni.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+// LINT_C_FILE
+
+// TODO(gnattishness) note assumptions regarding trying to fuzz multiple Java
+// targets or implementations
+// TODO(gnattishness) allow fuzzing with more than 1 target - i.e. multiple
+// methods?
+
+// NOTE: just use global variables to store state for now
+// Means we can't have more than 1 Java client at once, but can't run multiple
+// JVM interpreters anyway
+
+static JavaVM *g_jvm;  // Pointer to the JVM
+static JNIEnv *g_env;  // Pointer to native interface
+static jclass g_fuzz_class;
+static jobject g_fuzz_instance;
+static jmethodID g_fuzz_method;
+static jclass g_optional_class;
+static jmethodID g_optional_is_present;
+static jmethodID g_optional_get;
+
+/**
+ * Holds the last result from the fuzzing target.
+ *
+ * May be NULL if the last result was an error
+ * A JNI global ref, needs to be explicitly freed.
+ */
+static jobject g_last_result;
+
+/**
+ * Stores the size of the last result, if it exists.
+ *
+ * May be -1 if the last result was an error.
+ *
+ * (Used for bounds checking)
+ *
+ * \Note jsize == int32_t
+ */
+static int32_t g_last_result_size;
+
+// TODO(gnattishness) do we reset g_last_result_size or leave as garbage when
+// freeing last result? if reset, can more safely handle when an error-free,
+// valid result is empty (with size 0)
+// * Only valid when `g_last_result != NULL`
+
+// TODO(gnattishness) use a persistent block of memory to hold most recent
+// result or malloc/free every time? time vs space tradeoffs we malloc for now,
+// for simplicity
+
+/**
+ * TODO(gnattishness) delete, outdated?
+ * Helper function to setup the temporary "g_last_result" storage for some size
+ *
+ * Upon completion, g_last_result points to some memory that can hold new_size
+ * bytes, and g_last_result_size == new_size.
+ *
+ * appropriately handles if g_last_result == NULL or not without leaking memory
+ *
+ * \param[in] new_size How big g_last_result should be.
+ *    If 0 or negative, g_last_result is set to NULL.
+ *
+ */
+// void prepare_last_result(int32_t new_size){
+//  // Also good for encapsulation so can more easily convert to fancier
+//  // methods to reduce memory allocations between fuzzing executions
+//  if (new_size <= 0) {
+//    if (g_last_result != NULL) {
+//      free(g_last_result);
+//      g_last_result = NULL;
+//    }
+//  } else if (g_last_result != NULL) {
+//    g_last_result = realloc(new_size);
+//    if (g_last_result == NULL) {
+//      fprintf(stderr, "BFUZZ Fatal: memory allocation failed.");
+//      abort();
+//    }
+//  } else {
+//    g_last_result = malloc(new_size);
+//    if (g_last_result == NULL) {
+//      fprintf(stderr, "BFUZZ Fatal: memory allocation failed.");
+//      abort();
+//    }
+//  }
+//  g_last_result_size = new_size;
+//}
+
+/**
+ * Just some safety checking.
+ *
+ * Should be NULL if bfuzz_jni_load_result was appropriately called after a
+ * successful result.
+ */
+void last_result_should_be_null() {
+  if (g_last_result != NULL) {
+    fprintf(stderr,
+            "BFUZZ warning: Need to call bfuzz_jni_load_result after every "
+            "successful call to bfuzz_jni_run! Likely bug in fuzzer.\n");
+    (*g_env)->DeleteGlobalRef(g_env, g_last_result);
+    g_last_result = NULL;
+  }
+}
+
+/**
+ * Initialize Java vm and target for fuzzing.
+ *
+ * \warning Should only be called once for the lifetime of the process.
+ *
+ * \param[in] fuzz_class_name The name Java class containing the fuzzing target
+ * to exercise. \param[in] fuzz_method_name The name of the fuzzing target to
+ * exercise. \param[in] class_path Java Classpath containing user defined
+ * classes and packages. Colon delimited in Unix. \param[in] bls_disabled
+ * Whether to disable bls verification. \see
+ * https://en.wikipedia.org/wiki/Classpath
+ */
+void bfuzz_jni_init(char const *fuzz_class_name, char const *fuzz_method_name,
+                    char const *class_path, bool bls_disabled) {
+  // TODO(gnattishness) more docs on what the expected Java interface looks
+  // like? i.e. Java take in some byte array and returns an optional byte array
+  JavaVMInitArgs vm_args;
+  size_t len = strlen(class_path);
+  char const *prefix = "-Djava.class.path=";
+  size_t prefix_len = strlen(prefix);
+  // can be big so use a heap variable
+  char *class_path_option = malloc(prefix_len + len + 1);
+  if (class_path_option == NULL) {
+    fprintf(stderr, "BFUZZ Fatal: Failed to allocate class_path_option memory");
+    abort();
+  }
+  strncpy(class_path_option, prefix, prefix_len + 1);
+  // TODO(gnattishness) best practice to add a null at the end here? it should
+  // never overflow anyway
+  strncat(class_path_option, class_path, len);
+
+  JavaVMOption options[1];
+  options[0].optionString = class_path_option;
+  // options[1].optionString = (char*)"-verbose:jni";
+
+  // TODO(gnattishness) abort and exit hooks if it doesn't immediately abort
+  // already?
+  // https://docs.oracle.com/en/java/javase/11/docs/specs/jni/invocation.html#jni_createjavavm
+  // TODO(gnattishness) what version should I use?
+  vm_args.version = JNI_VERSION_10;
+  vm_args.nOptions = 1;
+  vm_args.options = options;
+  vm_args.ignoreUnrecognized = false;
+  jint err = JNI_CreateJavaVM(&g_jvm, (void **)&g_env, &vm_args);
+  free(class_path_option);
+  if (err != JNI_OK) {
+    fprintf(stderr,
+            "BFUZZ Fatal: JNI_CreateJavaVM() initialization failed: %" PRId32
+            "\n",
+            (int32_t)err);
+    abort();
+  }
+
+  g_fuzz_class = (*g_env)->FindClass(g_env, fuzz_class_name);
+  if (g_fuzz_class == NULL) {
+    fprintf(stderr, "BFUZZ Fatal: Unable to load %s class definition\n",
+            fuzz_class_name);
+    (*g_env)->ExceptionDescribe(g_env);
+    abort();
+  }
+  jmethodID fuzzCtor =
+      (*g_env)->GetMethodID(g_env, g_fuzz_class, "<init>", "(ZZ)V");
+  if (fuzzCtor == NULL) {
+    fprintf(stderr, "BFUZZ Fatal: Unable to locate fuzz class constructor\n");
+    (*g_env)->ExceptionDescribe(g_env);
+    abort();
+  }
+  // bool params correspond to useMainnetConfig, disable_bls flags
+  g_fuzz_instance = (*g_env)->NewObject(g_env, g_fuzz_class, fuzzCtor, JNI_TRUE,
+                                        bls_disabled);
+  if (g_fuzz_instance == NULL) {
+    fprintf(stderr, "BFUZZ Fatal: Unable to construct fuzz class instance.\n");
+    (*g_env)->ExceptionDescribe(g_env);
+    abort();
+  }
+  g_fuzz_method = (*g_env)->GetMethodID(g_env, g_fuzz_class, fuzz_method_name,
+                                        "([B)Ljava/util/Optional;");
+  if (g_fuzz_method == NULL) {
+    fprintf(stderr, "BFUZZ Fatal: Unable to find method: %s.\n",
+            fuzz_method_name);
+    (*g_env)->ExceptionDescribe(g_env);
+    abort();
+  }
+  // we keep a reference to this so subsequent methodIds remain valid
+  // see
+  // https://docs.oracle.com/en/java/javase/11/docs/specs/jni/design.html#accessing-fields-and-methods
+  g_optional_class = (*g_env)->FindClass(g_env, "java/util/Optional");
+  if (g_optional_class == NULL) {
+    fprintf(stderr, "BFUZZ Fatal: Unable to locate \"Optional\" class\n");
+    (*g_env)->ExceptionDescribe(g_env);
+    abort();
+  }
+  g_optional_is_present =
+      (*g_env)->GetMethodID(g_env, g_optional_class, "isPresent", "()Z");
+  if (g_optional_is_present == NULL) {
+    fprintf(stderr,
+            "BFUZZ Fatal: Unable to locate Optional.isPresent() method\n");
+    (*g_env)->ExceptionDescribe(g_env);
+    abort();
+  }
+  // NOTE: for the types here, get should return a jbyteArray "()[B", but this
+  // is not enforced at runtime
+  g_optional_get = (*g_env)->GetMethodID(g_env, g_optional_class, "get",
+                                         "()Ljava/lang/Object;");
+  if (g_optional_get == NULL) {
+    fprintf(stderr, "BFUZZ Fatal: Unable to locate Optional.get() method\n");
+    (*g_env)->ExceptionDescribe(g_env);
+    abort();
+  }
+
+  g_last_result =
+      NULL;  // It should probably be this anyway, but double checking.
+  g_last_result_size = -1;
+  // TODO(gnattishness) detach?
+}
+
+/**
+ * Run the registered Java fuzzing target with some input.
+ *
+ * \param[in] data The memory area to pass to the fuzzing target.
+ * \param[in] size The number of bytes to pass.
+ * \return The number of bytes in the target's output, or -1 if an (expected)
+ * error occurred
+ *
+ * \note
+ * max java array size is contained within an int32, so fine to use an int32_t
+ * as the return type
+ * https://stackoverflow.com/questions/3038392/do-java-arrays-have-a-maximum-size
+ * Also GetArrayLength returns a jint, which is an int32
+ * https://docs.oracle.com/en/java/javase/11/docs/specs/jni/functions.html#getarraylength
+ * https://docs.oracle.com/en/java/javase/11/docs/specs/jni/types.html#primitive-types
+ *
+ */
+// TODO(gnattishness) should data be const?
+int32_t bfuzz_jni_run(uint8_t const *data, size_t size) {
+  last_result_should_be_null();
+
+  if (size > INT32_MAX) {
+    // this makes it ok to call NewByteArray without worrying about it
+    // truncating the size value.
+    fprintf(stderr,
+            "BFUZZ Fatal: input size %zu too large for Java Array (must be "
+            "within int32)\n",
+            size);
+    abort();
+  }
+
+  // TODO(gnattishness) in 2 steps to find the exact size?
+  // Does rust want to provide the return destination?
+  // or do we make it free the result?
+  // Just do the same as for Prysm for now
+  //
+  // TODO(gnattishness) think about how many times these are copied
+  // TODO(gnattishness) use primitivearraycritical to reduce copying?
+
+  jbyteArray input = (*g_env)->NewByteArray(g_env, size);
+  if (input == NULL) {
+    fprintf(stderr, "BFUZZ Fatal: Unable to create input jarray.\n");
+    (*g_env)->ExceptionDescribe(g_env);
+    abort();
+  }
+
+  (*g_env)->SetByteArrayRegion(g_env, input, 0, size, (const jbyte *)data);
+
+  // NOTE: type checking is not performed here
+  jobject maybe_result =
+      (*g_env)->CallObjectMethod(g_env, g_fuzz_instance, g_fuzz_method, input);
+  if ((*g_env)->ExceptionCheck(g_env) == JNI_TRUE) {
+    fprintf(stderr, "Uncaught Java exception while calling target:\n");
+    (*g_env)->ExceptionDescribe(g_env);
+    abort();
+  }
+  (*g_env)->DeleteLocalRef(g_env, input);  // no longer need this
+
+  if ((*g_env)->CallBooleanMethod(g_env, maybe_result, g_optional_is_present) ==
+      JNI_TRUE) {
+    // bytes were returned
+    jbyteArray result = (jbyteArray)(*g_env)->CallObjectMethod(
+        g_env, maybe_result, g_optional_get);
+    if (result == NULL) {
+      fprintf(stderr, "BFUZZ Fatal: Java result array unexpectedly NULL.\n");
+      (*g_env)->ExceptionDescribe(g_env);
+      abort();
+    }
+    jsize result_size = (*g_env)->GetArrayLength(g_env, result);
+    if ((*g_env)->ExceptionCheck(g_env) == JNI_TRUE) {
+      // NOTE: better practice to check for pending exceptions after each
+      // call, as later calls may have undefined behavior, but we are ok to
+      // abort if any exception occurs in the above
+      fprintf(stderr,
+              "BFUZZ Fatal: Unexpected exception extracting Java result.\n");
+      (*g_env)->ExceptionDescribe(g_env);
+      abort();
+    }
+
+    if (result_size == 0) {
+      // don't worry about the result if it's a 0 length array
+      (*g_env)->DeleteLocalRef(g_env, result);
+    } else {
+      g_last_result = (*g_env)->NewGlobalRef(g_env, result);
+      if (g_last_result == NULL) {
+        fprintf(stderr, "BFUZZ Fatal: System probably out of memory.\n");
+        abort();
+      }
+    }
+    g_last_result_size = result_size;
+  } else {
+    // optional result is empty, indicating an error during processing
+    g_last_result_size = -1;
+  }
+
+  // docs e.g.
+  // https://docs.oracle.com/en/java/javase/11/docs/specs/jni/design.html#referencing-java-objects
+  // refer to the case where java is calling a native method that eventually
+  // returns not the other way around - can a local ref used within a c++
+  // method be freed during any subsequent JNI method that is not
+  // `NewGlobalRef`?
+  //
+  // or are local references never automatically freed because this doesn't
+  // "return" to Java according to this:
+  // https://www.ibm.com/support/knowledgecenter/en/SSYKE2_8.0.0/com.ibm.java.vm.80.doc/docs/jni_refs.html
+  // we would need to detach from the JVM in order for automatic garbage
+  // collection to occur as this is single threaded, we never perform garbage
+  // collection unless we detach or manually Can methods create local
+  // references internally that can then explode?
+  //
+  // could detach and attach the jvm each time, but a fair bit of overhead?
+  // And how would gc occur without an active Java thread? a daemon-thread?
+  // TODO(gnattishness) if internal code creates local references that are
+  // never gc'd we'd need to detach
+  //
+  // TODO(gnattishness) delete local references
+  // shouldn't need to worry about threads and attaching the vm,
+  // as libfuzzer is single-threaded
+  //
+  // don't have to worry about cleaning up if we abort.
+  (*g_env)->DeleteLocalRef(g_env, maybe_result);
+
+  // TODO(gnattishness) detach?
+  return g_last_result_size;
+}
+
+/**
+ * Copy last successful fuzzing result into dest.
+ *
+ * \param[out] dest the memory region in which to store the result
+ * \param[in] size the maximum number of bytes to copy to dest
+ *
+ * \warning Should only be called at most once per call to bfuzz_jni_run
+ *
+ * Should be called if the last call to bfuzz_jni_run returned successfully
+ *
+ * may or may not deallocate the result after copying, so don't call it twice!
+ * size is not a necessary parameter, but is used to protect against accidental
+ * buffer overflows. will abort if size is not as expected
+ */
+void bfuzz_jni_load_result(uint8_t *dest, size_t size) {
+  if (g_last_result_size == -1) {
+    // Either called this twice in a row, or trying to get a result when an
+    // error was returned
+    fprintf(stderr,
+            "BFUZZ Fatal: trying to load a result when none was last returned. "
+            "Bug in fuzzing!\n");
+    abort();
+  }
+  if ((ptrdiff_t)size != (ptrdiff_t)g_last_result_size) {
+    fprintf(stderr,
+            "BFUZZ Fatal: trying to load result with wrong size. Bug in "
+            "fuzzing!\n");
+    abort();
+  }
+  if (g_last_result_size == 0) {
+    // TODO(gnattishness) implement - what to do it last_result_size is 0?
+    // complain or zero out, or noop?
+    fprintf(stderr,
+            "Need to figure out what to do for empty but valid results\n");
+    abort();
+  }
+  (*g_env)->GetByteArrayRegion(g_env, g_last_result, 0, size, (jbyte *)(dest));
+  if ((*g_env)->ExceptionCheck(g_env) == JNI_TRUE) {
+    fprintf(stderr,
+            "BFUZZ Fatal: Unexpected exception extracting Java result.\n");
+    (*g_env)->ExceptionDescribe(g_env);
+    abort();
+  }
+  // free g_last_result and uninitialize it
+  (*g_env)->DeleteGlobalRef(g_env, g_last_result);
+  g_last_result = NULL;
+  g_last_result_size = -1;
+
+  // TODO(gnattishness) detach?
+}
+
+// TODO(gnattishness) destroy VM?
diff --git a/beaconfuzz_v2/libs/bfuzz-jni/src/bfuzzjni.h b/beaconfuzz_v2/libs/bfuzz-jni/src/bfuzzjni.h
new file mode 100644
index 0000000..3463d1c
--- /dev/null
+++ b/beaconfuzz_v2/libs/bfuzz-jni/src/bfuzzjni.h
@@ -0,0 +1,58 @@
+#ifndef BEACONFUZZ_V2_LIBS_BFUZZ_JNI_SRC_BFUZZJNI_H_
+#define BEACONFUZZ_V2_LIBS_BFUZZ_JNI_SRC_BFUZZJNI_H_
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+/**
+ * Initialize Java vm and target for fuzzing.
+ *
+ * \warning Should only be called once for the lifetime of the process.
+ *
+ * \param[in] fuzz_class_name The name Java class containing the fuzzing target
+ * to exercise. \param[in] fuzz_method_name The name of the fuzzing target to
+ * exercise. \param[in] class_path Java Classpath containing user defined
+ * classes and packages. Colon delimited in Unix. \param[in] bls_disabled
+ * Whether to disable bls verification. \see
+ * https://en.wikipedia.org/wiki/Classpath
+ */
+void bfuzz_jni_init(char const *fuzz_class_name, char const *fuzz_method_name,
+                    char const *class_path, bool bls_disabled);
+
+/**
+ * Run the registered Java fuzzing target with some input.
+ *
+ * \param[in] data The memory area to pass to the fuzzing target.
+ * \param[in] size The number of bytes to pass.
+ * \return The number of bytes in the target's output, or -1 if an (expected)
+ * error occurred
+ *
+ * \note
+ * max java array size is contained within an int32, so fine to use an int32_t
+ * as the return type
+ * https://stackoverflow.com/questions/3038392/do-java-arrays-have-a-maximum-size
+ * Also GetArrayLength returns a jint, which is an int32
+ * https://docs.oracle.com/en/java/javase/11/docs/specs/jni/functions.html#getarraylength
+ * https://docs.oracle.com/en/java/javase/11/docs/specs/jni/types.html#primitive-types
+ *
+ */
+int32_t bfuzz_jni_run(uint8_t const *data, size_t size);
+
+/**
+ * Copy last successful fuzzing result into dest.
+ *
+ * \param[out] dest the memory region in which to store the result
+ * \param[in] size the maximum number of bytes to copy to dest
+ *
+ * \warning Should only be called at most once per call to bfuzz_jni_run
+ *
+ * Should be called if the last call to bfuzz_jni_run returned successfully
+ *
+ * may or may not deallocate the result after copying, so don't call it twice!
+ * size is not a necessary parameter, but is used to protect against accidental
+ * buffer overflows. will abort if size is not as expected
+ */
+void bfuzz_jni_load_result(uint8_t *dest, size_t size);
+
+#endif  // BEACONFUZZ_V2_LIBS_BFUZZ_JNI_SRC_BFUZZJNI_H_
diff --git a/beaconfuzz_v2/libs/bfuzz-jni/src/dummy.c b/beaconfuzz_v2/libs/bfuzz-jni/src/dummy.c
new file mode 100644
index 0000000..b198ce8
--- /dev/null
+++ b/beaconfuzz_v2/libs/bfuzz-jni/src/dummy.c
@@ -0,0 +1,19 @@
+#include <stdio.h>
+
+#include "bfuzzjni.h"
+
+int main() {
+  bfuzz_jni_init("DummyFuzzUtil", "fuzzAttestation", ".", 1);
+  uint8_t data[50] = {1, 2, 3, 4, 5};
+  int out = bfuzz_jni_run(data, 50);
+  printf("In C Result val=%d\n", out);
+  if (out > 0) {
+    uint8_t result[out];
+    bfuzz_jni_load_result(result, out);
+    printf("Result content: ");
+    for (int i = 0; i < 50; i++) {
+      printf("%d ", result[i]);
+    }
+    printf("\n");
+  }
+}
diff --git a/beaconfuzz_v2/libs/bfuzz-jni/src/lib.rs b/beaconfuzz_v2/libs/bfuzz-jni/src/lib.rs
new file mode 100644
index 0000000..37fc988
--- /dev/null
+++ b/beaconfuzz_v2/libs/bfuzz-jni/src/lib.rs
@@ -0,0 +1,23 @@
+use std::env;
+
+include!(concat!(env!("OUT_DIR"), "/bindings.rs"));
+
+// TODO do we want any more wrapped bindings here, so the unsafe stuff is done here?
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    // TODO(gnattishness) relevant tests
+
+    //#[test]
+    //fn call_it() {
+    //    unsafe {
+    //        hello();
+    //    }
+    //}
+
+    #[test]
+    fn it_works() {
+        assert_eq!(2 + 2, 4);
+    }
+}
diff --git a/beaconfuzz_v2/libs/eth2clientsfuzz/Cargo.toml b/beaconfuzz_v2/libs/eth2clientsfuzz/Cargo.toml
index d423823..47cab80 100644
--- a/beaconfuzz_v2/libs/eth2clientsfuzz/Cargo.toml
+++ b/beaconfuzz_v2/libs/eth2clientsfuzz/Cargo.toml
@@ -8,10 +8,11 @@ edition = "2018"
 
 [dependencies]
 nimbus = { path = "../nimbus" }
+teku = { path = "../teku" }
 prysm = { path = "../prysm" }
 lighthouse = { path = "../lighthouse" }
 eth2_ssz = { path = "../../../../lighthouse/consensus/ssz/" }
 eth2_ssz_derive = { path = "../../../../lighthouse/consensus/ssz_derive/" }
 state_processing = { path = "../../../../lighthouse/consensus/state_processing/", features = ["arbitrary-fuzz"]}
 types = { path = "../../../../lighthouse/consensus/types", features = ["arbitrary-fuzz"]}
-arbitrary = { version = "0.4.6", features = ["derive"] }
\ No newline at end of file
+arbitrary = { version = "0.4.6", features = ["derive"] }
diff --git a/beaconfuzz_v2/libs/eth2clientsfuzz/src/attestation.rs b/beaconfuzz_v2/libs/eth2clientsfuzz/src/attestation.rs
index 87b20ca..56c92e1 100644
--- a/beaconfuzz_v2/libs/eth2clientsfuzz/src/attestation.rs
+++ b/beaconfuzz_v2/libs/eth2clientsfuzz/src/attestation.rs
@@ -53,6 +53,7 @@ pub fn run_attestation(beacon_blob: &[u8], data: &[u8], debug: bool) {
             if debug {
                 println!("[LIGHTHOUSE] Processing {}", true);
             }
+            //TODO avoid serializing post 3 times
 
             // call prysm
             let res = prysm::process_attestation(&beacon_blob, &data, &post.as_ssz_bytes());
@@ -71,6 +72,15 @@ pub fn run_attestation(beacon_blob: &[u8], data: &[u8], debug: bool) {
             } else {
                 assert_eq!(res, true);
             }
+
+            // call teku
+            let res = teku::process_attestation(&state.clone(), &att, &post.as_ssz_bytes());
+
+            if debug {
+                println!("[TEKU] Processing {}", res);
+            } else {
+                assert_eq!(res, true);
+            }
         } else {
             if debug {
                 println!("[LIGHTHOUSE] Processing {}", false);
@@ -93,6 +103,15 @@ pub fn run_attestation(beacon_blob: &[u8], data: &[u8], debug: bool) {
             } else {
                 assert_eq!(res, false);
             }
+
+            // Verify that teku gives same result as lighthouse
+            let res = teku::process_attestation(&state.clone(), &att, &beacon_blob.clone());
+
+            if debug {
+                println!("[TEKU] Processing {}", res);
+            } else {
+                assert_eq!(res, false);
+            }
         }
 
     // Data is an invalid SSZ container
diff --git a/beaconfuzz_v2/libs/eth2clientsfuzz/src/attester_slashing.rs b/beaconfuzz_v2/libs/eth2clientsfuzz/src/attester_slashing.rs
index 65eead4..2fd4944 100644
--- a/beaconfuzz_v2/libs/eth2clientsfuzz/src/attester_slashing.rs
+++ b/beaconfuzz_v2/libs/eth2clientsfuzz/src/attester_slashing.rs
@@ -38,6 +38,15 @@ pub fn run_attester_slashing(beacon_blob: &[u8], data: &[u8], debug: bool) {
             } else {
                 assert_eq!(res, true);
             }
+
+            // call teku
+            let res = teku::process_attester_slashing(&state.clone(), &att, &post.as_ssz_bytes());
+
+            if debug {
+                println!("[TEKU] Processing {}", res);
+            } else {
+                assert_eq!(res, true);
+            }
         } else {
             if debug {
                 println!("[LIGHTHOUSE] Processing {}", false);
@@ -60,6 +69,15 @@ pub fn run_attester_slashing(beacon_blob: &[u8], data: &[u8], debug: bool) {
             } else {
                 assert_eq!(res, false);
             }
+
+            // Verify that teku gives same result as lighthouse
+            let res = teku::process_attester_slashing(&state.clone(), &att, &beacon_blob.clone());
+
+            if debug {
+                println!("[TEKU] Processing {}", res);
+            } else {
+                assert_eq!(res, false);
+            }
         }
 
     // Data is an invalid SSZ container
diff --git a/beaconfuzz_v2/libs/eth2clientsfuzz/src/block.rs b/beaconfuzz_v2/libs/eth2clientsfuzz/src/block.rs
index bfcd625..4c1278b 100644
--- a/beaconfuzz_v2/libs/eth2clientsfuzz/src/block.rs
+++ b/beaconfuzz_v2/libs/eth2clientsfuzz/src/block.rs
@@ -38,6 +38,15 @@ pub fn run_block(beacon_blob: &[u8], data: &[u8], debug: bool) {
             } else {
                 assert_eq!(res, true);
             }
+
+            // call teku
+            let res = teku::process_block(&state.clone(), &att, &post.as_ssz_bytes());
+
+            if debug {
+                println!("[TEKU] Processing {}", res);
+            } else {
+                assert_eq!(res, true);
+            }
         } else {
             if debug {
                 println!("[LIGHTHOUSE] Processing {}", false);
@@ -60,6 +69,15 @@ pub fn run_block(beacon_blob: &[u8], data: &[u8], debug: bool) {
             } else {
                 assert_eq!(res, false);
             }
+
+            // Verify that teku gives same result as lighthouse
+            let res = teku::process_block(&state.clone(), &att, &beacon_blob.clone());
+
+            if debug {
+                println!("[TEKU] Processing {}", res);
+            } else {
+                assert_eq!(res, false);
+            }
         }
 
     // Data is an invalid SSZ container
diff --git a/beaconfuzz_v2/libs/eth2clientsfuzz/src/block_header.rs b/beaconfuzz_v2/libs/eth2clientsfuzz/src/block_header.rs
index afeb5ac..de6c9bf 100644
--- a/beaconfuzz_v2/libs/eth2clientsfuzz/src/block_header.rs
+++ b/beaconfuzz_v2/libs/eth2clientsfuzz/src/block_header.rs
@@ -38,6 +38,15 @@ pub fn run_block_header(beacon_blob: &[u8], data: &[u8], debug: bool) {
             } else {
                 assert_eq!(res, true);
             }
+
+            // call teku
+            let res = teku::process_block_header(&state.clone(), &att, &post.as_ssz_bytes());
+
+            if debug {
+                println!("[TEKU] Processing {}", res);
+            } else {
+                assert_eq!(res, true);
+            }
         } else {
             if debug {
                 println!("[LIGHTHOUSE] Processing {}", false);
@@ -60,6 +69,15 @@ pub fn run_block_header(beacon_blob: &[u8], data: &[u8], debug: bool) {
             } else {
                 assert_eq!(res, false);
             }
+
+            // Verify that teku gives same result as lighthouse
+            let res = teku::process_block_header(&state.clone(), &att, &beacon_blob.clone());
+
+            if debug {
+                println!("[TEKU] Processing {}", res);
+            } else {
+                assert_eq!(res, false);
+            }
         }
 
     // Data is an invalid SSZ container
diff --git a/beaconfuzz_v2/libs/eth2clientsfuzz/src/deposit.rs b/beaconfuzz_v2/libs/eth2clientsfuzz/src/deposit.rs
index a083d7f..f0fb847 100644
--- a/beaconfuzz_v2/libs/eth2clientsfuzz/src/deposit.rs
+++ b/beaconfuzz_v2/libs/eth2clientsfuzz/src/deposit.rs
@@ -38,6 +38,15 @@ pub fn run_deposit(beacon_blob: &[u8], data: &[u8], debug: bool) {
             } else {
                 assert_eq!(res, true);
             }
+
+            // call teku
+            let res = teku::process_deposit(&state.clone(), &att, &post.as_ssz_bytes());
+
+            if debug {
+                println!("[TEKU] Processing {}", res);
+            } else {
+                assert_eq!(res, true);
+            }
         } else {
             if debug {
                 println!("[LIGHTHOUSE] Processing {}", false);
@@ -60,6 +69,15 @@ pub fn run_deposit(beacon_blob: &[u8], data: &[u8], debug: bool) {
             } else {
                 assert_eq!(res, false);
             }
+
+            // Verify that teku gives same result as lighthouse
+            let res = teku::process_deposit(&state.clone(), &att, &beacon_blob.clone());
+
+            if debug {
+                println!("[TEKU] Processing {}", res);
+            } else {
+                assert_eq!(res, false);
+            }
         }
 
     // Data is an invalid SSZ container
diff --git a/beaconfuzz_v2/libs/eth2clientsfuzz/src/lib.rs b/beaconfuzz_v2/libs/eth2clientsfuzz/src/lib.rs
index 0e25575..a73d995 100644
--- a/beaconfuzz_v2/libs/eth2clientsfuzz/src/lib.rs
+++ b/beaconfuzz_v2/libs/eth2clientsfuzz/src/lib.rs
@@ -7,6 +7,7 @@ pub mod proposer_slashing;
 pub mod voluntary_exit;
 
 // Initialize eth2clients
+// NOTE: teku needs to be initialized separately
 pub fn initialize_clients(disable_bls: bool) {
     prysm::init_prysm(disable_bls);
     nimbus::init_nimbus(disable_bls);
@@ -17,6 +18,7 @@ pub fn debug_clients(activate_debug_mode: bool) {
     prysm::debug_mode_prysm(activate_debug_mode);
     nimbus::debug_mode_nimbus(activate_debug_mode);
     lighthouse::debug_mode_lighthouse(activate_debug_mode);
+    teku::debug_mode_teku(activate_debug_mode);
 }
 
 // TODO - testing
diff --git a/beaconfuzz_v2/libs/eth2clientsfuzz/src/proposer_slashing.rs b/beaconfuzz_v2/libs/eth2clientsfuzz/src/proposer_slashing.rs
index c3fa063..4f85ffc 100644
--- a/beaconfuzz_v2/libs/eth2clientsfuzz/src/proposer_slashing.rs
+++ b/beaconfuzz_v2/libs/eth2clientsfuzz/src/proposer_slashing.rs
@@ -38,6 +38,15 @@ pub fn run_proposer_slashing(beacon_blob: &[u8], data: &[u8], debug: bool) {
             } else {
                 assert_eq!(res, true);
             }
+
+            // call teku
+            let res = teku::process_proposer_slashing(&state.clone(), &att, &post.as_ssz_bytes());
+
+            if debug {
+                println!("[TEKU] Processing {}", res);
+            } else {
+                assert_eq!(res, true);
+            }
         } else {
             if debug {
                 println!("[LIGHTHOUSE] Processing {}", false);
@@ -60,6 +69,15 @@ pub fn run_proposer_slashing(beacon_blob: &[u8], data: &[u8], debug: bool) {
             } else {
                 assert_eq!(res, false);
             }
+
+            // Verify that teku gives same result as lighthouse
+            let res = teku::process_proposer_slashing(&state.clone(), &att, &beacon_blob.clone());
+
+            if debug {
+                println!("[TEKU] Processing {}", res);
+            } else {
+                assert_eq!(res, false);
+            }
         }
 
     // Data is an invalid SSZ container
diff --git a/beaconfuzz_v2/libs/eth2clientsfuzz/src/voluntary_exit.rs b/beaconfuzz_v2/libs/eth2clientsfuzz/src/voluntary_exit.rs
index 1b3095c..e47bf72 100644
--- a/beaconfuzz_v2/libs/eth2clientsfuzz/src/voluntary_exit.rs
+++ b/beaconfuzz_v2/libs/eth2clientsfuzz/src/voluntary_exit.rs
@@ -38,6 +38,15 @@ pub fn run_voluntary_exit(beacon_blob: &[u8], data: &[u8], debug: bool) {
             } else {
                 assert_eq!(res, true);
             }
+
+            // call teku
+            let res = teku::process_voluntary_exit(&state.clone(), &att, &post.as_ssz_bytes());
+
+            if debug {
+                println!("[TEKU] Processing {}", res);
+            } else {
+                assert_eq!(res, true);
+            }
         } else {
             if debug {
                 println!("[LIGHTHOUSE] Processing {}", false);
@@ -60,6 +69,15 @@ pub fn run_voluntary_exit(beacon_blob: &[u8], data: &[u8], debug: bool) {
             } else {
                 assert_eq!(res, false);
             }
+
+            // Verify that teku gives same result as lighthouse
+            let res = teku::process_voluntary_exit(&state.clone(), &att, &beacon_blob.clone());
+
+            if debug {
+                println!("[TEKU] Processing {}", res);
+            } else {
+                assert_eq!(res, false);
+            }
         }
 
     // Data is an invalid SSZ container
diff --git a/beaconfuzz_v2/libs/nimbus/build.rs b/beaconfuzz_v2/libs/nimbus/build.rs
index 24cca9b..803dc95 100644
--- a/beaconfuzz_v2/libs/nimbus/build.rs
+++ b/beaconfuzz_v2/libs/nimbus/build.rs
@@ -4,6 +4,16 @@ fn main() {
     let nimbus_dir =
         env::var("CARGO_NIMBUS_DIR").expect("NIMBUS build: CARGO_NIMBUS_DIR not defined");
 
+    println!("cargo:rerun-if-env-changed=CARGO_NIMBUS_DIR");
+    println!("cargo:rerun-if-changed={}/build/libnfuzz.a", nimbus_dir);
+    println!(
+        "cargo:rustc-link-search=native={}/vendor/nim-libbacktrace/install/usr/lib/libbacktrace.a",
+        nimbus_dir
+    );
+    println!(
+        "cargo:rustc-link-search=native={}/vendor/nim-libbacktrace/install/usr/lib/libbacktracenim.a",
+        nimbus_dir
+    );
     println!("cargo:rustc-link-search=native={}/build/", nimbus_dir);
     println!("cargo:rustc-link-lib=static=nfuzz");
     println!(
diff --git a/beaconfuzz_v2/libs/prysm/build.rs b/beaconfuzz_v2/libs/prysm/build.rs
index e0ea796..ec837df 100644
--- a/beaconfuzz_v2/libs/prysm/build.rs
+++ b/beaconfuzz_v2/libs/prysm/build.rs
@@ -6,11 +6,20 @@ fn main() {
     // go build -o libpfuzz.a -buildmode=c-archive pfuzz.go
     // Prysm deps
 
+    println!("cargo:rerun-if-env-changed=CARGO_PRYSM_DIR");
+    println!(
+        "cargo:rustc-link-search=native={}/pfuzz/libpfuzz.a",
+        prysm_dir
+    );
+    println!(
+        "cargo:rustc-link-search=native={}/pfuzz/libbls384_256.a",
+        prysm_dir
+    );
+
     println!("cargo:rustc-link-search=native={}/pfuzz", prysm_dir);
     println!("cargo:rustc-link-lib=static=pfuzz");
     // deps patrick local
     //println!("cargo:rustc-link-search=native={}/src/github.com/herumi/bls-eth-go-binary/bls/lib/linux/amd64", prysm_dir);
-    println!("cargo:rustc-link-search=native={}/pfuzz", prysm_dir);
     println!("cargo:rustc-link-lib=static=bls384_256");
     println!("cargo:rustc-link-lib=dylib=stdc++");
 }
diff --git a/beaconfuzz_v2/libs/teku/Cargo.toml b/beaconfuzz_v2/libs/teku/Cargo.toml
new file mode 100644
index 0000000..739d91d
--- /dev/null
+++ b/beaconfuzz_v2/libs/teku/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "teku"
+version = "0.1.0"
+authors = ["Nathaniel Jensen <nathaniel at sigmaprime dot io>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+bfuzz-jni = { path = "../bfuzz-jni" }
+eth2_ssz = { path = "../../../../lighthouse/consensus/ssz/" }
+eth2_ssz_derive = { path = "../../../../lighthouse/consensus/ssz_derive/" }
+types = { path = "../../../../lighthouse/consensus/types" }
diff --git a/beaconfuzz_v2/libs/teku/src/attestation.rs b/beaconfuzz_v2/libs/teku/src/attestation.rs
new file mode 100644
index 0000000..76ca9d4
--- /dev/null
+++ b/beaconfuzz_v2/libs/teku/src/attestation.rs
@@ -0,0 +1,29 @@
+use ssz::Encode; //Decode
+use ssz_derive::{Decode, Encode};
+
+use types::{Attestation, BeaconState, MainnetEthSpec};
+
+// TODO move to common types/util crate?
+#[derive(Decode, Encode)]
+struct AttestationTestCase {
+    pre: BeaconState<MainnetEthSpec>,
+    attestation: Attestation<MainnetEthSpec>,
+}
+
+use crate::util::run_target;
+
+pub fn process_attestation(
+    beacon: &BeaconState<MainnetEthSpec>,
+    attest: &Attestation<MainnetEthSpec>,
+    post: &[u8],
+    debug: bool,
+) -> bool {
+    // create testcase ssz struct
+    let target: AttestationTestCase = AttestationTestCase {
+        pre: beacon.clone(),
+        attestation: attest.clone(),
+    };
+
+    let input_ssz = target.as_ssz_bytes();
+    run_target(input_ssz.as_slice(), post, debug)
+}
diff --git a/beaconfuzz_v2/libs/teku/src/attester_slashing.rs b/beaconfuzz_v2/libs/teku/src/attester_slashing.rs
new file mode 100644
index 0000000..1ece8a4
--- /dev/null
+++ b/beaconfuzz_v2/libs/teku/src/attester_slashing.rs
@@ -0,0 +1,28 @@
+use ssz::Encode; //Decode
+use ssz_derive::{Decode, Encode};
+
+use crate::util::run_target;
+use types::{AttesterSlashing, BeaconState, MainnetEthSpec};
+
+// TODO move to common types/util crate?
+#[derive(Decode, Encode)]
+struct AttesterSlashingTestCase {
+    pub pre: BeaconState<MainnetEthSpec>,
+    pub attester_slashing: AttesterSlashing<MainnetEthSpec>,
+}
+
+pub fn process_attester_slashing(
+    beacon: &BeaconState<MainnetEthSpec>,
+    attester_slashing: &AttesterSlashing<MainnetEthSpec>,
+    post: &[u8],
+    debug: bool,
+) -> bool {
+    // create testcase ssz struct
+    let target: AttesterSlashingTestCase = AttesterSlashingTestCase {
+        pre: beacon.clone(),
+        attester_slashing: attester_slashing.clone(),
+    };
+
+    let input_ssz = target.as_ssz_bytes();
+    run_target(input_ssz.as_slice(), post, debug)
+}
diff --git a/beaconfuzz_v2/libs/teku/src/block.rs b/beaconfuzz_v2/libs/teku/src/block.rs
new file mode 100644
index 0000000..9ffa50b
--- /dev/null
+++ b/beaconfuzz_v2/libs/teku/src/block.rs
@@ -0,0 +1,27 @@
+use ssz::Encode; //Decode
+use ssz_derive::{Decode, Encode};
+
+use crate::util::run_target;
+use types::{BeaconState, MainnetEthSpec, SignedBeaconBlock};
+
+#[derive(Decode, Encode)]
+struct BlockTestCase {
+    pub pre: BeaconState<MainnetEthSpec>,
+    pub beacon_block: SignedBeaconBlock<MainnetEthSpec>,
+}
+
+pub fn process_block(
+    beacon: &BeaconState<MainnetEthSpec>,
+    beacon_block: &SignedBeaconBlock<MainnetEthSpec>,
+    post: &[u8],
+    debug: bool,
+) -> bool {
+    // create testcase ssz struct
+    let target: BlockTestCase = BlockTestCase {
+        pre: beacon.clone(),
+        beacon_block: beacon_block.clone(),
+    };
+
+    let input_ssz = target.as_ssz_bytes();
+    run_target(input_ssz.as_slice(), post, debug)
+}
diff --git a/beaconfuzz_v2/libs/teku/src/block_header.rs b/beaconfuzz_v2/libs/teku/src/block_header.rs
new file mode 100644
index 0000000..8ae7d1a
--- /dev/null
+++ b/beaconfuzz_v2/libs/teku/src/block_header.rs
@@ -0,0 +1,32 @@
+use ssz::Encode; //Decode
+use ssz_derive::{Decode, Encode};
+
+use crate::util::run_target;
+use types::{BeaconBlock, BeaconState, MainnetEthSpec, Signature, SignedBeaconBlock};
+
+#[derive(Decode, Encode)]
+struct BlockHeaderTestCase {
+    pub pre: BeaconState<MainnetEthSpec>,
+    pub beacon_block: SignedBeaconBlock<MainnetEthSpec>,
+}
+
+// TODO modify to take a SignedBeaconBlock instead?
+pub fn process_block_header(
+    beacon: &BeaconState<MainnetEthSpec>,
+    beacon_block: &BeaconBlock<MainnetEthSpec>,
+    post: &[u8],
+    debug: bool,
+) -> bool {
+    // create testcase ssz struct
+    // we need to wrap BeaconBlock into a SignedBeaconBlock
+    let target: BlockHeaderTestCase = BlockHeaderTestCase {
+        pre: beacon.clone(),
+        beacon_block: SignedBeaconBlock {
+            message: beacon_block.clone(),
+            signature: Signature::empty(),
+        },
+    };
+
+    let input_ssz = target.as_ssz_bytes();
+    run_target(input_ssz.as_slice(), post, debug)
+}
diff --git a/beaconfuzz_v2/libs/teku/src/debug.rs b/beaconfuzz_v2/libs/teku/src/debug.rs
new file mode 100644
index 0000000..fa1785d
--- /dev/null
+++ b/beaconfuzz_v2/libs/teku/src/debug.rs
@@ -0,0 +1,22 @@
+use std::fs::File;
+use std::io::Write;
+
+const PREFIX: &str = "teku";
+
+pub fn dump_post_state(post: &[u8], out: &[u8]) {
+    // Create dump file for lighthouse post
+    // in case lighthouse return an error, this file will be the pre-state
+    let mut file_post =
+        File::create(&format!("{}_debug_post.ssz", PREFIX)).expect("Cannot open debug_post file");
+
+    // write the content
+    file_post
+        .write(&post)
+        .expect("Cannot write debug_post file");
+
+    // Create dump file for other client post
+    let mut file_out =
+        File::create(&format!("{}_debug_out.ssz", PREFIX)).expect("Cannot open debug_out file");
+    // write the content
+    file_out.write(&out).expect("Cannot write debug_out file");
+}
diff --git a/beaconfuzz_v2/libs/teku/src/deposit.rs b/beaconfuzz_v2/libs/teku/src/deposit.rs
new file mode 100644
index 0000000..1a0c4b4
--- /dev/null
+++ b/beaconfuzz_v2/libs/teku/src/deposit.rs
@@ -0,0 +1,28 @@
+use ssz::Encode; //Decode
+use ssz_derive::{Decode, Encode};
+
+use crate::util::run_target;
+use types::{BeaconState, Deposit, MainnetEthSpec};
+
+// TODO move to common types/util crate?
+#[derive(Decode, Encode)]
+struct DepositTestCase {
+    pub pre: BeaconState<MainnetEthSpec>,
+    pub deposit: Deposit,
+}
+
+pub fn process_deposit(
+    beacon: &BeaconState<MainnetEthSpec>,
+    deposit: &Deposit,
+    post: &[u8],
+    debug: bool,
+) -> bool {
+    // create testcase ssz struct
+    let target: DepositTestCase = DepositTestCase {
+        pre: beacon.clone(),
+        deposit: deposit.clone(),
+    };
+
+    let input_ssz = target.as_ssz_bytes();
+    run_target(input_ssz.as_slice(), post, debug)
+}
diff --git a/beaconfuzz_v2/libs/teku/src/lib.rs b/beaconfuzz_v2/libs/teku/src/lib.rs
new file mode 100644
index 0000000..87f20ca
--- /dev/null
+++ b/beaconfuzz_v2/libs/teku/src/lib.rs
@@ -0,0 +1,85 @@
+use types::{
+    Attestation, AttesterSlashing, BeaconBlock, BeaconState, Deposit, MainnetEthSpec,
+    ProposerSlashing, SignedBeaconBlock, SignedVoluntaryExit,
+};
+
+pub mod attestation;
+pub mod attester_slashing;
+pub mod block;
+pub mod block_header;
+pub mod debug;
+pub mod deposit;
+pub mod proposer_slashing;
+pub mod util;
+pub mod voluntary_exit;
+
+static mut DEBUG: bool = false;
+
+pub fn debug_mode_teku(activate_debug_mode: bool) {
+    unsafe {
+        DEBUG = activate_debug_mode;
+    }
+}
+
+pub use util::init_teku;
+pub use util::FuzzTarget;
+
+pub fn process_attestation(
+    beacon: &BeaconState<MainnetEthSpec>,
+    attest: &Attestation<MainnetEthSpec>,
+    post: &[u8],
+) -> bool {
+    self::attestation::process_attestation(beacon, attest, post, unsafe { DEBUG })
+}
+
+pub fn process_attester_slashing(
+    beacon: &BeaconState<MainnetEthSpec>,
+    attester_slashing: &AttesterSlashing<MainnetEthSpec>,
+    post: &[u8],
+) -> bool {
+    self::attester_slashing::process_attester_slashing(beacon, attester_slashing, post, unsafe {
+        DEBUG
+    })
+}
+
+pub fn process_block(
+    beacon: &BeaconState<MainnetEthSpec>,
+    beacon_block: &SignedBeaconBlock<MainnetEthSpec>,
+    post: &[u8],
+) -> bool {
+    self::block::process_block(beacon, beacon_block, post, unsafe { DEBUG })
+}
+
+pub fn process_block_header(
+    beacon: &BeaconState<MainnetEthSpec>,
+    beacon_block: &BeaconBlock<MainnetEthSpec>,
+    post: &[u8],
+) -> bool {
+    self::block_header::process_block_header(beacon, beacon_block, post, unsafe { DEBUG })
+}
+
+pub fn process_deposit(
+    beacon: &BeaconState<MainnetEthSpec>,
+    deposit: &Deposit,
+    post: &[u8],
+) -> bool {
+    self::deposit::process_deposit(beacon, deposit, post, unsafe { DEBUG })
+}
+
+pub fn process_proposer_slashing(
+    beacon: &BeaconState<MainnetEthSpec>,
+    proposer_slashing: &ProposerSlashing,
+    post: &[u8],
+) -> bool {
+    self::proposer_slashing::process_proposer_slashing(beacon, proposer_slashing, post, unsafe {
+        DEBUG
+    })
+}
+
+pub fn process_voluntary_exit(
+    beacon: &BeaconState<MainnetEthSpec>,
+    exit: &SignedVoluntaryExit,
+    post: &[u8],
+) -> bool {
+    self::voluntary_exit::process_voluntary_exit(beacon, exit, post, unsafe { DEBUG })
+}
diff --git a/beaconfuzz_v2/libs/teku/src/proposer_slashing.rs b/beaconfuzz_v2/libs/teku/src/proposer_slashing.rs
new file mode 100644
index 0000000..fa28f96
--- /dev/null
+++ b/beaconfuzz_v2/libs/teku/src/proposer_slashing.rs
@@ -0,0 +1,27 @@
+use ssz::Encode; //Decode
+use ssz_derive::{Decode, Encode};
+
+use crate::util::run_target;
+use types::{BeaconState, MainnetEthSpec, ProposerSlashing};
+
+#[derive(Decode, Encode)]
+struct ProposerSlashingTestCase {
+    pub pre: BeaconState<MainnetEthSpec>,
+    pub proposer_slashing: ProposerSlashing,
+}
+
+pub fn process_proposer_slashing(
+    beacon: &BeaconState<MainnetEthSpec>,
+    proposer_slashing: &ProposerSlashing,
+    post: &[u8],
+    debug: bool,
+) -> bool {
+    // create testcase ssz struct
+    let target: ProposerSlashingTestCase = ProposerSlashingTestCase {
+        pre: beacon.clone(),
+        proposer_slashing: proposer_slashing.clone(),
+    };
+
+    let input_ssz = target.as_ssz_bytes();
+    run_target(input_ssz.as_slice(), post, debug)
+}
diff --git a/beaconfuzz_v2/libs/teku/src/util.rs b/beaconfuzz_v2/libs/teku/src/util.rs
new file mode 100644
index 0000000..8957d96
--- /dev/null
+++ b/beaconfuzz_v2/libs/teku/src/util.rs
@@ -0,0 +1,206 @@
+use bfuzz_jni;
+use std::convert::TryInto;
+use std::env;
+use std::ffi::CString;
+use std::format;
+use std::path::Path;
+use std::path::PathBuf;
+use std::process::Command;
+
+use crate::debug::dump_post_state;
+
+const FUZZ_CLASS: &str = "tech/pegasys/teku/fuzz/FuzzUtil";
+
+// All supported teku fuzzing targets
+pub enum FuzzTarget {
+    Attestation,
+    AttesterSlashing,
+    Block,
+    BlockHeader,
+    Deposit,
+    ProposerSlashing,
+    Shuffle,
+    VoluntaryExit,
+}
+
+impl FuzzTarget {
+    fn to_method_name(&self) -> &str {
+        match self {
+            Self::Attestation => "fuzzAttestation",
+            Self::AttesterSlashing => "fuzzAttesterSlashing",
+            Self::Block => "fuzzBlock",
+            Self::BlockHeader => "fuzzBlockHeader",
+            Self::Deposit => "fuzzDeposit",
+            Self::ProposerSlashing => "fuzzProposerSlashing",
+            Self::Shuffle => "fuzzShuffle",
+            Self::VoluntaryExit => "fuzzVoluntaryExit",
+        }
+    }
+}
+
+// Extracts suitable Java CLASS_PATH from teku shell script
+// requires teku to have already been built and locally "installed"
+fn extract_classpath<P: AsRef<Path>>(teku_root: P) -> String {
+    let teku_root_p = teku_root.as_ref();
+    let teku_script = teku_root_p.join("build/scripts/teku");
+    if !teku_script.is_file() {
+        panic!(
+            "BeaconFuzz fatal: File does not exist: '{:?}'. Have you built teku?",
+            teku_script
+        )
+    }
+    let teku_home = teku_root_p
+        .join("build/install/teku")
+        .canonicalize()
+        .unwrap();
+    if !teku_home.is_dir() {
+        panic!(
+            "BeaconFuzz fatal: Directory does not exist '{:?}'. Have you built teku?",
+            teku_home
+        )
+    }
+    // TODO replace with rust equivalent
+    // JAVA_CLASSPATH=$(grep -F CLASSPATH= "$TEKU_SCRIPT" | head -n 1 | cut -d= -f 2 | sed 's:\$APP_HOME:'"$TEKU_HOME"':g')
+    let output = Command::new("sh")
+        .arg("-c")
+        .arg(format!(
+            "grep -F CLASSPATH= \"{}\" | head -n 1 | cut -d= -f 2 | sed 's:\\$APP_HOME:'\"{}\"':g'",
+            teku_script.display(),
+            teku_home.display()
+        ))
+        .output()
+        .expect("BeaconFuzz failed to execute command to extract Teku CLASSPATH");
+    if !output.status.success() {
+        panic!("BeaconFuzz fatal: Failed to extract Teku CLASSPATH() from script");
+    }
+    let dist_classpath = String::from_utf8(output.stdout).unwrap();
+    // TODO replace/fix workaround
+    // NOTE: this is hard-coding the fuzz output path so will break when new teku versions are
+    // released, also might have pain on Mac OS?
+    let teku_fuzz_jar = teku_root_p.join("fuzz/build/libs/teku-fuzz-0.12.9-SNAPSHOT.jar").canonicalize().expect("BeaconFuzz fatal: unable to locate teku fuzz class. Did you build with ./gradlew fuzz:build?");
+    format!("{}:{}", dist_classpath, teku_fuzz_jar.display())
+}
+
+// TODO safety to ensure this is never called twice
+pub fn init_teku(disable_bls: bool, target: FuzzTarget) {
+    let teku_root = PathBuf::from(
+        env::var("BFUZZ_TEKU_DIR").expect("BeaconFuzz config error: BFUZZ_TEKU_DIR not defined"),
+    );
+    let class_path = CString::new(extract_classpath(teku_root)).expect("CString::new failed");
+    let fuzz_class = CString::new(FUZZ_CLASS).expect("CString::new failed");
+    let method_name = CString::new(target.to_method_name()).expect("CString::new failed");
+
+    unsafe {
+        bfuzz_jni::bfuzz_jni_init(
+            fuzz_class.as_ptr(),
+            method_name.as_ptr(),
+            class_path.as_ptr(),
+            disable_bls,
+        );
+    }
+}
+
+pub fn run_target(input: &[u8], lh_post: &[u8], debug: bool) -> bool {
+    // TODO make unsafe chunk smaller
+    // only needed around the 2 bfuzz_jni calls and the set_len
+    unsafe {
+        let ret = bfuzz_jni::bfuzz_jni_run(input.as_ptr(), input.len().try_into().unwrap());
+        if debug {
+            println!("bfuzz_jni_run result val: {:?}", ret);
+        }
+        // If error triggered during processing, we return immediately
+        if ret < 0 {
+            return false;
+        }
+
+        let mut result: Vec<u8> = Vec::with_capacity(ret.try_into().unwrap());
+        let result_size: usize = ret.try_into().unwrap();
+        // NOTE: the C code uses a size_t but bindgen uses a u64 instead of usize
+        // (though looks to be more accurate behaviour)
+        // https://github.com/rust-lang/rust-bindgen/issues/1671
+        bfuzz_jni::bfuzz_jni_load_result(result.as_mut_ptr(), result_size.try_into().unwrap());
+        result.set_len(result_size);
+        if debug {
+            println!("result content: {:?}", result);
+        }
+        if result.as_slice() != lh_post {
+            if debug {
+                println!("[TEKU] Mismatch post");
+            } else {
+                // make fuzzer to crash
+                panic!("[TEKU] Mismatch post");
+            }
+        }
+
+        // dump post files for debugging
+        if debug {
+            dump_post_state(&lh_post, result.as_slice());
+        }
+    }
+
+    true
+}
+
+/*
+fn main() {
+    init_teku(true, FuzzTarget::Attestation);
+    // NOTE: this raises an exception because we expect to have received valid SSZ after initial
+    // pre-processing
+    let data: Vec<u8> = vec![0; 50];
+    let post: Vec<u8> = vec![0; 50];
+    run_target(data.as_slice(), post.as_slice(), true);
+}
+*/
+
+// TODO(gnattishness) use for unit test
+/*fn main() {
+    // dummy to try calling the java
+    let class_name = CString::new("DummyFuzzUtil").expect("CString::new failed");
+    let method_name = CString::new("fuzzAttestation").expect("CString::new failed");
+    // lol at this rust code
+    //let class_path = CString::new(
+    //    env::current_dir()
+    //        .unwrap()
+    //        .canonicalize()
+    //        .unwrap()
+    //        .to_str()
+    //        .unwrap(),
+    //)
+    //.expect("CString::new failed");
+    let class_path = CString::new(
+        env::current_dir()
+            .unwrap()
+            .join("../bfuzz-jni/src")
+            .canonicalize()
+            .unwrap()
+            .to_str()
+            .unwrap(),
+    )
+    .expect("CString::new failed");
+    let bls_disabled = true;
+    let mut data: Vec<u8> = vec![0; 50];
+    for i in 1..=5 {
+        data[i - 1] = i as u8;
+    }
+    // data is 1,2,3,4,5,0,0,0,0...
+    unsafe {
+        bfuzz_jni::bfuzz_jni_init(
+            class_name.as_ptr(),
+            method_name.as_ptr(),
+            class_path.as_ptr(),
+            bls_disabled,
+        );
+        let ret = bfuzz_jni::bfuzz_jni_run(data.as_ptr(), data.len().try_into().unwrap());
+        println!("bfuzz_jni_run result val: {:?}", ret);
+        if ret >= 0 {
+            let mut result: Vec<u8> = Vec::with_capacity(ret.try_into().unwrap());
+            let result_size: usize = ret.try_into().unwrap();
+            // NOTE: the C code uses a size_t but bindgen uses a u64 instead of usize
+            // (though looks to be more accurate behaviour)
+            // https://github.com/rust-lang/rust-bindgen/issues/1671
+            bfuzz_jni::bfuzz_jni_load_result(result.as_mut_ptr(), result_size.try_into().unwrap());
+            result.set_len(result_size);
+            println!("result content: {:?}", result);
+        }
+    }
+}*/
diff --git a/beaconfuzz_v2/libs/teku/src/voluntary_exit.rs b/beaconfuzz_v2/libs/teku/src/voluntary_exit.rs
new file mode 100644
index 0000000..4f29629
--- /dev/null
+++ b/beaconfuzz_v2/libs/teku/src/voluntary_exit.rs
@@ -0,0 +1,27 @@
+use ssz::Encode; //Decode
+use ssz_derive::{Decode, Encode};
+
+use crate::util::run_target;
+use types::{BeaconState, MainnetEthSpec, SignedVoluntaryExit};
+
+#[derive(Decode, Encode)]
+struct VoluntaryExitTestCase {
+    pub pre: BeaconState<MainnetEthSpec>,
+    pub exit: SignedVoluntaryExit,
+}
+
+pub fn process_voluntary_exit(
+    beacon: &BeaconState<MainnetEthSpec>,
+    exit: &SignedVoluntaryExit,
+    post: &[u8],
+    debug: bool,
+) -> bool {
+    // create testcase ssz struct
+    let target: VoluntaryExitTestCase = VoluntaryExitTestCase {
+        pre: beacon.clone(),
+        exit: exit.clone(),
+    };
+
+    let input_ssz = target.as_ssz_bytes();
+    run_target(input_ssz.as_slice(), post, debug)
+}
diff --git a/beaconfuzz_v2/src/bin/diff_attestation.rs b/beaconfuzz_v2/src/bin/diff_attestation.rs
index 6501aac..7321874 100644
--- a/beaconfuzz_v2/src/bin/diff_attestation.rs
+++ b/beaconfuzz_v2/src/bin/diff_attestation.rs
@@ -25,6 +25,8 @@ extern crate rand;
 use rand::seq::SliceRandom;
 use rand::thread_rng;
 
+use teku;
+
 /// List file in folder and return list of files paths
 #[inline(always)]
 fn list_files_in_folder(path_str: &String) -> Result<Vec<String>, ()> {
@@ -130,6 +132,7 @@ fn main() {
 
     // Initialize eth2client environment
     eth2clientsfuzz::initialize_clients(true);
+    teku::init_teku(true, teku::FuzzTarget::Attestation);
 
     // Run fuzzing loop
     loop {
diff --git a/beaconfuzz_v2/src/bin/diff_attester_slashing.rs b/beaconfuzz_v2/src/bin/diff_attester_slashing.rs
index ddf5668..4cad2e2 100644
--- a/beaconfuzz_v2/src/bin/diff_attester_slashing.rs
+++ b/beaconfuzz_v2/src/bin/diff_attester_slashing.rs
@@ -130,6 +130,7 @@ fn main() {
 
     // Initialize eth2client environment
     eth2clientsfuzz::initialize_clients(true);
+    teku::init_teku(true, teku::FuzzTarget::AttesterSlashing);
 
     // Run fuzzing loop
     loop {
diff --git a/beaconfuzz_v2/src/bin/diff_block.rs b/beaconfuzz_v2/src/bin/diff_block.rs
index 847d3f8..a2575eb 100644
--- a/beaconfuzz_v2/src/bin/diff_block.rs
+++ b/beaconfuzz_v2/src/bin/diff_block.rs
@@ -130,6 +130,7 @@ fn main() {
 
     // Initialize eth2client environment
     eth2clientsfuzz::initialize_clients(true);
+    teku::init_teku(true, teku::FuzzTarget::Block);
 
     // Run fuzzing loop
     loop {
diff --git a/beaconfuzz_v2/src/bin/diff_block_header.rs b/beaconfuzz_v2/src/bin/diff_block_header.rs
index 2aa8c44..877f726 100644
--- a/beaconfuzz_v2/src/bin/diff_block_header.rs
+++ b/beaconfuzz_v2/src/bin/diff_block_header.rs
@@ -130,6 +130,7 @@ fn main() {
 
     // Initialize eth2client environment
     eth2clientsfuzz::initialize_clients(true);
+    teku::init_teku(true, teku::FuzzTarget::BlockHeader);
 
     // Run fuzzing loop
     loop {
diff --git a/beaconfuzz_v2/src/bin/diff_deposit.rs b/beaconfuzz_v2/src/bin/diff_deposit.rs
index aef0ebe..0d50f75 100644
--- a/beaconfuzz_v2/src/bin/diff_deposit.rs
+++ b/beaconfuzz_v2/src/bin/diff_deposit.rs
@@ -130,6 +130,7 @@ fn main() {
 
     // Initialize eth2client environment
     eth2clientsfuzz::initialize_clients(true);
+    teku::init_teku(true, teku::FuzzTarget::Deposit);
 
     // Run fuzzing loop
     loop {
diff --git a/beaconfuzz_v2/src/bin/diff_proposer_slashing.rs b/beaconfuzz_v2/src/bin/diff_proposer_slashing.rs
index 3d413da..62a5f55 100644
--- a/beaconfuzz_v2/src/bin/diff_proposer_slashing.rs
+++ b/beaconfuzz_v2/src/bin/diff_proposer_slashing.rs
@@ -130,6 +130,7 @@ fn main() {
 
     // Initialize eth2client environment
     eth2clientsfuzz::initialize_clients(true);
+    teku::init_teku(true, teku::FuzzTarget::ProposerSlashing);
 
     // Run fuzzing loop
     loop {
diff --git a/beaconfuzz_v2/src/bin/diff_voluntary_exit.rs b/beaconfuzz_v2/src/bin/diff_voluntary_exit.rs
index 3835982..1a5a9bb 100644
--- a/beaconfuzz_v2/src/bin/diff_voluntary_exit.rs
+++ b/beaconfuzz_v2/src/bin/diff_voluntary_exit.rs
@@ -130,6 +130,7 @@ fn main() {
 
     // Initialize eth2client environment
     eth2clientsfuzz::initialize_clients(true);
+    teku::init_teku(true, teku::FuzzTarget::VoluntaryExit);
 
     // Run fuzzing loop
     loop {