diff --git a/doc/README.md b/doc/README.md
index 112bee37e4a..9e066273946 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -1,4 +1,4 @@
-Zcash Core 0.11.2.z3
+Zcash Core 0.11.2.z4
 ====================
 
 [Zcash](https://z.cash/) is the Zcash client. It downloads and stores the entire history of Zcash transactions (which is currently several GBs); depending on the speed of your computer and network connection, the synchronization process can take anywhere from a few hours to a day or more.
diff --git a/doc/release-notes/release-notes-0.11.2.z4.md b/doc/release-notes/release-notes-0.11.2.z4.md
new file mode 100644
index 00000000000..cbdbafc26ec
--- /dev/null
+++ b/doc/release-notes/release-notes-0.11.2.z4.md
@@ -0,0 +1,70 @@
+Alex (1):
+      add sha256sum support for Mac OS X
+
+Alfie John (1):
+      Rename libzerocash to libzcash
+
+Jack Grigg (21):
+      Implement mining slow start with a linear ramp
+      Update subsidy tests to account for mining slow start
+      Update miner tests to account for mining slow start
+      Disable mining slow start in regtest mode
+      Fix failing miner test
+      Add Zcash revision to version strings
+      Bitcoin -> Zcash in version and help text
+      Add Zcash Developers to CLI copyright notice
+      Minor error message tweak
+      Refactor StepRow to make optimisation easier
+      Cleanups
+      Implement index-truncation Equihash optimisation
+      Store truncated indices in the same char* as the hash (H/T tromp for the idea!)
+      Use template parameters to statically initialise Equihash
+      Merge *StepRow XOR and trimming operations
+      Use comparator object for sorting StepRows
+      Store full indices in the same char* as the hash
+      Use fixed-width array for storing hash and indices
+      Use optimised Equihash solver for miner and benchmarks
+      Fix comment
+      Fix nits after review
+
+Nathan Wilcox (1):
+      Fix a test name bug so that ``make cov-zcash`` correctly runs the ``zcash-gtest`` binary. Fixes #946.
+
+Sean Bowe (14):
+      Refactor PRF_gadget to hand responsibility to PRF_addr_a_pk_gadget for creating the '0' argument to the PRF.
+      Enforce first four bits are zero for all spending keys and phi.
+      Enable binary serializations of proofs and r1cs keys, and make the `CPourTx` proof field fixed-size.
+      Reorder fields of CPourTx to reflect the spec.
+      Update proving key and tests that depend on transaction structure changes
+      Enable MULTICORE proving behavior with omp.
+      Pass `-fopenmp` at compile-time to enable MULTICORE.
+      Switch to Ed25519 for cryptographic binding of joinsplits to transactions.
+      Enforce that the `S` value of the ed25519 signature is smaller than the group order to prevent malleability attacks.
+      Use joinsplit_sig_t in more places.
+      Wrap lines in *CTransaction constructors.
+      Change error for invalid joinsplit signature for consistency.
+      Add additional assertions.
+      Update performance measurement transaction.
+
+Simon (2):
+      Remove Bitcoin testnet seeds.
+      Remove Bitcoin mainnet seeds.
+
+Taylor Hornby (16):
+      Fix build warnings in sighash tests.
+      Fix FORTIFY_SOURCE build errors.
+      Use HARDENED_CPPFLAGS in the Makefile consistently.
+      Use left shift instead of floating-point pow() in equihash.
+      Ignore deprecated declaration warnings.
+      Remove unused code in libzerocash util.cpp
+      Turn on -Werror for the Zcash build.
+      Patch libsnark to build with my compiler. Upstream PR #35.
+      Hide new Boost warnings on GCC 6.
+      Add ability to run things under valgrind.
+      Pass -DPURIFY to OpenSSL so it doesn't clutter valgrind output.
+      Enable -v for valgrind so we can see counts for each error.
+      Sign JoinSplit transactions
+      We don't want to benchmark signature creation / verification.
+      Implement signature verification in CheckTransaction
+      Fix tests for JoinSplit signatures
+
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
index 74d8ebdd819..db453576937 100644
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -150,10 +150,10 @@ class CTestNetParams : public CMainParams {
         consensus.nMajorityWindow = 100;
         consensus.powLimit = uint256S("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
         consensus.fPowAllowMinDifficultyBlocks = true;
-        pchMessageStart[0] = 0xf1;
-        pchMessageStart[1] = 0x2d;
-        pchMessageStart[2] = 0xea;
-        pchMessageStart[3] = 0x1c;
+        pchMessageStart[0] = 0x6d;
+        pchMessageStart[1] = 0xf6;
+        pchMessageStart[2] = 0xe7;
+        pchMessageStart[3] = 0x55;
         vAlertPubKey = ParseHex("04302390343f91cc401d56d68b123028bf52e5fca1939df127f63c6467cdf9c8e2c14b61104cf817d0b780da337893ecc4aaff1309e536162dabbdb45200ca2b0a");
         nDefaultPort = 18333;
         nMinerThreads = 0;