diff --git a/.github/workflows/docker-shared.yml b/.github/workflows/docker-shared.yml
index 618690b4a3..a2a0eb7cae 100644
--- a/.github/workflows/docker-shared.yml
+++ b/.github/workflows/docker-shared.yml
@@ -18,7 +18,7 @@ jobs:
 
       - uses: mlugg/setup-zig@v1
         with:
-          version: 0.13.0
+          version: 0.14.0
 
       #
       # BUILD
diff --git a/.github/workflows/shared.yml b/.github/workflows/shared.yml
index 865cf3c847..6f2a55d585 100644
--- a/.github/workflows/shared.yml
+++ b/.github/workflows/shared.yml
@@ -74,7 +74,7 @@ jobs:
 
       - uses: mlugg/setup-zig@v1
         with:
-          version: 0.13.0
+          version: 0.14.0
 
       - name: Build binaries
         run: |
diff --git a/.gitignore b/.gitignore
index f7267dc16c..69db6955cc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,9 +9,14 @@
 MODULE.bazel
 MODULE.bazel.lock
 
+# Zig
 **/.zig-cache
 **/zig-out
 
+# clangd
+**/.cache
+compile_commands.json
+
 # Swap files.
 *.swo
 *.swp
diff --git a/INSTALL.md b/INSTALL.md
index 6c01a93ce9..759a8069f1 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -17,7 +17,7 @@ Additional targets:
 
 ## Prerequisites
 
-Install version 0.13.0 of `zig` with the package manager of your choosing, e.g., `brew install zig`, or download the binary from [here][zig-download].
+Install version 0.14.0 of `zig` with the package manager of your choosing, e.g., `brew install zig`, or download the binary from [here][zig-download].
 
 ### macOS debugger
 
diff --git a/build.zig b/build.zig
index ffeaf1307f..0cae4640e4 100644
--- a/build.zig
+++ b/build.zig
@@ -1,21 +1,25 @@
 const std = @import("std");
 
-const VERSION = "3.3";
+const VERSION = "3.4";
 
-const main_targets = .{
+const main_targets: []const std.Target.Query = &[_]std.Target.Query{
     .{ .cpu_arch = .aarch64, .os_tag = .macos, .abi = null },
     .{ .cpu_arch = .x86_64, .os_tag = .macos, .abi = null },
     .{ .cpu_arch = .aarch64, .os_tag = .linux, .abi = .musl },
     .{ .cpu_arch = .x86_64, .os_tag = .linux, .abi = .musl },
 };
 
-const supported_targets: []const std.Target.Query = &(main_targets ++ .{
+const supported_targets: []const std.Target.Query = &[_]std.Target.Query{
+    .{ .cpu_arch = .aarch64, .os_tag = .macos, .abi = null },
+    .{ .cpu_arch = .x86_64, .os_tag = .macos, .abi = null },
+    .{ .cpu_arch = .aarch64, .os_tag = .linux, .abi = .musl },
+    .{ .cpu_arch = .x86_64, .os_tag = .linux, .abi = .musl },
     .{ .cpu_arch = .aarch64, .os_tag = .linux, .abi = .gnu },
     .{ .cpu_arch = .x86_64, .os_tag = .linux, .abi = .gnu },
     .{ .cpu_arch = .x86_64, .os_tag = .linux, .abi = .gnu, .glibc_version = std.SemanticVersion{ .major = 2, .minor = 27, .patch = 0 } },
-});
+};
 
-const targets: []const std.Target.Query = &main_targets;
+const targets: []const std.Target.Query = main_targets;
 
 const BuildCfg = struct {
     version: []const u8,
@@ -395,7 +399,7 @@ fn buildBinary(
     });
     b.getInstallStep().dependOn(&target_output.step);
 
-    if (target.result.isDarwin() and !target.query.isNative()) {
+    if (target.result.os.tag.isDarwin() and !target.query.isNative()) {
         const macos_sdk = b.lazyDependency("macos_sdk", .{
             .target = target,
             .optimize = optimize,
@@ -425,7 +429,7 @@ fn buildBinary(
     urbit.linkLibrary(whereami.artifact("whereami"));
     urbit.linkLibrary(wasm3.artifact("wasm3"));
 
-    if (t.isDarwin()) {
+    if (t.os.tag.isDarwin()) {
         // Requires llvm@18 homebrew installation
         if (cfg.asan or cfg.ubsan)
             urbit.addLibraryPath(.{
@@ -582,7 +586,7 @@ fn buildBinary(
                 .optimize = optimize,
             });
 
-            if (t.isDarwin() and !target.query.isNative()) {
+            if (t.os.tag.isDarwin() and !target.query.isNative()) {
                 const macos_sdk = b.lazyDependency("macos_sdk", .{
                     .target = target,
                     .optimize = optimize,
diff --git a/build.zig.zon b/build.zig.zon
index a038ed9e12..02726c661c 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -1,10 +1,11 @@
 .{
-    .name = "urbit",
+    .name = .urbit,
     .version = "0.0.1",
+    .fingerprint = 0x9e228a3003a2736b,
     .dependencies = .{
         .macos_sdk = .{
             .url = "https://github.com/joseluisq/macosx-sdks/releases/download/14.5/MacOSX14.5.sdk.tar.xz",
-            .hash = "122033a9c16c63f66ba4c83d6c61f487b06a6435ed57201eaccb4c5703ce4cdd956e",
+            .hash = "N-V-__8AAKtK4FMzqcFsY_ZrpMg9bGH0h7BqZDXtVyAerMtM",
             .lazy = true,
         },
         .pkg_c3 = .{
@@ -54,7 +55,7 @@
         },
         .zlib = .{
             .url = "https://github.com/allyourcodebase/zlib/archive/0918e87b7629b9c6a50a08edd0ce30d849758faf.tar.gz",
-            .hash = "122034ab2a12adf8016ffa76e48b4be3245ffd305193edba4d83058adbcfa749c107",
+            .hash = "zlib-1.3.1-AAAAACEMAAA0qyoSrfgBb_p25ItL4yRf_TBRk-26TYMF",
         },
         .wasm3 = .{
             .path = "./ext/wasm3",
diff --git a/ext/avahi/build.zig b/ext/avahi/build.zig
index 44fe568090..a389a95633 100644
--- a/ext/avahi/build.zig
+++ b/ext/avahi/build.zig
@@ -538,7 +538,7 @@ pub fn build(b: *std.Build) void {
     avahi.root_module.addCMacro("HAVE_DBUS_CONNECTION_CLOSE", "0");
     avahi.root_module.addCMacro("HAVE_EXPAT_H", "1");
     avahi.root_module.addCMacro("HAVE_CONFIG_H", "1");
-    if (!t.isGnu())
+    if (!t.isGnuLibC())
         avahi.root_module.addCMacro("HAVE_STRLCPY", "1");
 
     const avahi_config_h = b.addConfigHeader(.{
diff --git a/ext/avahi/build.zig.zon b/ext/avahi/build.zig.zon
index 47ff422e19..58ac25b4e2 100644
--- a/ext/avahi/build.zig.zon
+++ b/ext/avahi/build.zig.zon
@@ -4,15 +4,16 @@
     .dependencies = .{
         .avahi = .{
             .url = "https://github.com/lathiat/avahi/releases/download/v0.8/avahi-0.8.tar.gz",
-            .hash = "1220df62c88bd00f3a397a83b5fc8b4ab657884bbc452a653892790ce213aa6fd900",
+            .hash = "N-V-__8AAOLVeQDfYsiL0A86OXqDtfyLSrZXiEu8RSplOJJ5",
         },
         .dbus = .{
-            .url = "https://src.fedoraproject.org/repo/pkgs/dbus/dbus-1.14.8.tar.xz/sha512/f3dfc73da28cbe20449d15bbe4166c3574f0e551dfd15fca7cce2b8c71e778360ed2dd391ee5c414a7a47ff4b958727b26ef4cabfee70564f8d0a34bf5ad2386/dbus-1.14.8.tar.xz",
-            .hash = "122083df329bed83b1383e11ff9d40038d643730f7d610f002608d9a48c4500719a3",
+            .url = "https://distfiles.alpinelinux.org/distfiles/v3.17/dbus-1.14.8.tar.xz",
+            // .url = "https://src.fedoraproject.org/repo/pkgs/dbus/dbus-1.14.8.tar.xz/sha512/f3dfc73da28cbe20449d15bbe4166c3574f0e551dfd15fca7cce2b8c71e778360ed2dd391ee5c414a7a47ff4b958727b26ef4cabfee70564f8d0a34bf5ad2386/dbus-1.14.8.tar.xz",
+            .hash = "N-V-__8AAEB_jACD3zKb7YOxOD4R_51AA41kNzD31hDwAmCN",
         },
         .expat = .{
             .url = "https://github.com/libexpat/libexpat/releases/download/R_2_5_0/expat-2.5.0.tar.xz",
-            .hash = "1220b1874d568d61688789eb2f1f2fe1ed06f66bb0480000df645c476472e31ae30f",
+            .hash = "N-V-__8AABFoMgCxh01WjWFoh4nrLx8v4e0G9muwSAAA32Rc",
         },
     },
     .paths = .{
diff --git a/ext/backtrace/build.zig b/ext/backtrace/build.zig
index d18947984c..84645dc3fe 100644
--- a/ext/backtrace/build.zig
+++ b/ext/backtrace/build.zig
@@ -81,7 +81,7 @@ pub fn build(b: *std.Build) void {
         ._POSIX_SOURCE = null,
     });
 
-    if (t.isDarwin()) {
+    if (t.os.tag.isDarwin()) {
         config_h.addValues(.{
             .HAVE_MACH_O_DYLD_H = 1,
         });
diff --git a/ext/backtrace/build.zig.zon b/ext/backtrace/build.zig.zon
index f42f65d6a2..13b1682b98 100644
--- a/ext/backtrace/build.zig.zon
+++ b/ext/backtrace/build.zig.zon
@@ -4,7 +4,7 @@
     .dependencies = .{
         .backtrace = .{
             .url = "https://github.com/ianlancetaylor/libbacktrace/archive/4ead348bb45f753121ca0bd44170ff8352d4c514.tar.gz",
-            .hash = "12205a46d567bd07761595d56787a1abb487c321e204bf3148e3657203bb2329160e",
+            .hash = "N-V-__8AADzSKgBaRtVnvQd2FZXVZ4ehq7SHwyHiBL8xSONl",
         },
     },
     .paths = .{
diff --git a/ext/curl/build.zig b/ext/curl/build.zig
index f1493380ff..9ba69f907c 100644
--- a/ext/curl/build.zig
+++ b/ext/curl/build.zig
@@ -70,12 +70,9 @@ pub fn build(b: *std.Build) void {
     if (target.result.os.tag == .windows) {
         curl.linkSystemLibrary("bcrypt");
     } else {
-        curl.root_module.addCMacro(
-            "CURL_EXTERN_SYMBOL",
-            "__attribute__ ((__visibility__ (\"default\"))"
-        );
+        curl.root_module.addCMacro("CURL_EXTERN_SYMBOL", "__attribute__ ((__visibility__ (\"default\"))");
 
-        const isDarwin = target.result.isDarwin();
+        const isDarwin = target.result.os.tag.isDarwin();
         if (!isDarwin)
             curl.root_module.addCMacro("ENABLE_IPV6", "1");
         curl.root_module.addCMacro("HAVE_ALARM", "1");
diff --git a/ext/curl/build.zig.zon b/ext/curl/build.zig.zon
index 12ae0e3db9..cae43971c7 100644
--- a/ext/curl/build.zig.zon
+++ b/ext/curl/build.zig.zon
@@ -4,7 +4,7 @@
     .dependencies = .{
         .curl = .{
             .url = "https://github.com/curl/curl/releases/download/curl-8_9_1/curl-8.9.1.tar.gz",
-            .hash = "1220f36375f7a423b8dc41b14612d685f48e030b25d0f6eb69011179e9b68e4584e0",
+            .hash = "N-V-__8AAFnEQQHzY3X3pCO43EGxRhLWhfSOAwsl0PbraQER",
         },
         .openssl = .{
             .path = "../openssl",
diff --git a/ext/gmp/build.zig.zon b/ext/gmp/build.zig.zon
index 47538723d8..8925443e6f 100644
--- a/ext/gmp/build.zig.zon
+++ b/ext/gmp/build.zig.zon
@@ -3,8 +3,8 @@
     .version = "0.0.1",
     .dependencies = .{
         .gmp = .{
-            .url = "https://ftp.gnu.org/gnu/gmp/gmp-6.3.0.tar.gz",
-            .hash = "1220d46202c17aa35ab5848a7f7a812b797c9f07698f263c8a02b4ad9640a1bbe0e3",
+            .url = "https://ftp.fr.openbsd.org/pub/OpenBSD/distfiles/gmp-6.3.0.tar.xz",
+            .hash = "N-V-__8AAE5fAwHUYgLBeqNatYSKf3qBK3l8nwdpjyY8igK0",
         },
     },
     .paths = .{
diff --git a/ext/h2o/build.zig b/ext/h2o/build.zig
index c2bfc15b41..0149ef8bf4 100644
--- a/ext/h2o/build.zig
+++ b/ext/h2o/build.zig
@@ -55,7 +55,7 @@ pub fn build(b: *std.Build) !void {
         .files = &.{"cloexec.c"},
         .flags = &.{
             "-fno-sanitize=all",
-            if (t.isGnu())
+            if (t.isGnuLibC())
                 "-D_GNU_SOURCE"
             else
                 "",
diff --git a/ext/h2o/build.zig.zon b/ext/h2o/build.zig.zon
index aba19ec223..ba1f83d6b0 100644
--- a/ext/h2o/build.zig.zon
+++ b/ext/h2o/build.zig.zon
@@ -4,7 +4,7 @@
     .dependencies = .{
         .h2o = .{
             .url = "https://github.com/h2o/h2o/archive/refs/tags/v2.2.6.tar.gz",
-            .hash = "12206fb50c715a131282752c7cd92abe3f5647f3ac28ae5c56fdd231896c44fdb86d",
+            .hash = "N-V-__8AAFCFqAJvtQxxWhMSgnUsfNkqvj9WR_OsKK5cVv3S",
         },
         .libuv = .{
             .path = "../libuv",
@@ -17,11 +17,11 @@
         },
         .zlib = .{
             .url = "https://github.com/allyourcodebase/zlib/archive/0918e87b7629b9c6a50a08edd0ce30d849758faf.tar.gz",
-            .hash = "122034ab2a12adf8016ffa76e48b4be3245ffd305193edba4d83058adbcfa749c107",
+            .hash = "zlib-1.3.1-AAAAACEMAAA0qyoSrfgBb_p25ItL4yRf_TBRk-26TYMF",
         },
         .sse2neon = .{
             .url = "https://github.com/DLTcollab/sse2neon/archive/refs/tags/v1.5.1.tar.gz",
-            .hash = "1220ced40ef8af4a4565aa1a7de678d43478df9b26483c062db2dbdc58b42c822268",
+            .hash = "N-V-__8AAPihCgDO1A74r0pFZaoafeZ41DR435smSDwGLbLb",
         },
         .patches = .{
             .path = "./patches",
diff --git a/ext/libuv/build.zig.zon b/ext/libuv/build.zig.zon
index d8a37a7409..a0c83dc76d 100644
--- a/ext/libuv/build.zig.zon
+++ b/ext/libuv/build.zig.zon
@@ -4,7 +4,7 @@
     .dependencies = .{
         .libuv = .{
             .url = "https://dist.libuv.org/dist/v1.50.0/libuv-v1.50.0.tar.gz",
-            .hash = "12207ac22e5e40afe515b7c319237785113c97ee84a75f7c66c1a0e7cc6e743debeb",
+            .hash = "N-V-__8AAH34QwB6wi5eQK_lFbfDGSN3hRE8l-6Ep198ZsGg",
         },
     },
     .paths = .{
diff --git a/ext/lmdb/build.zig.zon b/ext/lmdb/build.zig.zon
index 142bd2d99b..8e874310f2 100644
--- a/ext/lmdb/build.zig.zon
+++ b/ext/lmdb/build.zig.zon
@@ -4,7 +4,7 @@
     .dependencies = .{
         .lmdb = .{
             .url = "https://github.com/LMDB/lmdb/archive/refs/tags/LMDB_0.9.29.tar.gz",
-            .hash = "122008e42c2b9e46f8251038a22f7968dddc17ad2ec9c278d9032014073c0f584fac",
+            .hash = "N-V-__8AAHEmCAAI5Cwrnkb4JRA4oi95aN3cF60uycJ42QMg",
         },
     },
     .paths = .{
diff --git a/ext/murmur3/build.zig.zon b/ext/murmur3/build.zig.zon
index c4f0ec46e5..05ab23ecaa 100644
--- a/ext/murmur3/build.zig.zon
+++ b/ext/murmur3/build.zig.zon
@@ -4,7 +4,7 @@
     .dependencies = .{
         .murmur3 = .{
             .url = "https://github.com/PeterScott/murmur3/archive/dae94be0c0f54a399d23ea6cbe54bca5a4e93ce4.tar.gz",
-            .hash = "12201b70bb970bb8e197936edd9be02fa67699d517515c8077031affc4f25226dcdf",
+            .hash = "N-V-__8AABE5AAAbcLuXC7jhl5Nu3ZvgL6Z2mdUXUVyAdwMa",
         },
     },
     .paths = .{
diff --git a/ext/natpmp/build.zig.zon b/ext/natpmp/build.zig.zon
index 76d822b995..038468f39f 100644
--- a/ext/natpmp/build.zig.zon
+++ b/ext/natpmp/build.zig.zon
@@ -3,8 +3,9 @@
     .version = "0.0.1",
     .dependencies = .{
         .natpmp = .{
-            .url = "https://debian.mirror.root.lu/debian/pool/main/libn/libnatpmp/libnatpmp_20230423.orig.tar.gz",
-            .hash = "12203f777796f1df1db24c4194bcc6060d2a7bee2eea88527c2336bbf455d4108239",
+            .url = "https://mirrors.wikimedia.org/ubuntu/ubuntu/pool/main/libn/libnatpmp/libnatpmp_20230423.orig.tar.gz",
+            // .url = "https://debian.mirror.root.lu/debian/pool/main/libn/libnatpmp/libnatpmp_20230423.orig.tar.gz",
+            .hash = "N-V-__8AAKudAQA_d3eW8d8dskxBlLzGBg0qe-4u6ohSfCM2",
         },
     },
     .paths = .{
diff --git a/ext/openssl/build.zig b/ext/openssl/build.zig
index 54187fd8cf..12d57ac5dd 100644
--- a/ext/openssl/build.zig
+++ b/ext/openssl/build.zig
@@ -18,9 +18,9 @@ pub fn build(b: *std.Build) !void {
         b,
         target,
         optimize,
-        if (target.result.isDarwin()) &macos_cflags else &linux_cflags,
+        if (target.result.os.tag.isDarwin()) &macos_cflags else &linux_cflags,
     );
-    if (target.result.isDarwin() and !target.query.isNative()) {
+    if (target.result.os.tag.isDarwin() and !target.query.isNative()) {
         const macos_sdk = b.lazyDependency("macos_sdk", .{
             .target = target,
             .optimize = optimize,
@@ -37,7 +37,7 @@ pub fn build(b: *std.Build) !void {
         b,
         target,
         optimize,
-        if (target.result.isDarwin()) &macos_cflags else &linux_cflags,
+        if (target.result.os.tag.isDarwin()) &macos_cflags else &linux_cflags,
     ));
 }
 
@@ -76,13 +76,6 @@ fn libcrypto(
     lib.addIncludePath(dep.path("crypto/modes"));
     lib.addIncludePath(dep.path("include"));
 
-    // lib.root_module.addCMacro("__APPLE__", "");
-    // lib.root_module.addCMacro("__ARMEB__", "");
-    if (t.cpu.arch.isAARCH64())
-        lib.root_module.addCMacro("__ILP32__", "");
-    // lib.root_module.addCMacro("__AARCH64EB__", "");
-    // lib.root_module.addCMacro("__KERNEL__", "");
-
     lib.root_module.addCMacro("L_ENDIAN", "");
     lib.root_module.addCMacro("OPENSSL_PIC", "");
     lib.root_module.addCMacro("OPENSSL_CPUID_OBJ", "");
@@ -113,7 +106,7 @@ fn libcrypto(
     // lib.root_module.addCMacro("OPENSSL_NO_STDIO", "");
     // lib.root_module.addCMacro("OSSL_PKEY_PARAM_RSA_DERIVE_FROM_PQ", "1");
 
-    if (t.isDarwin() and t.cpu.arch.isAARCH64()) {
+    if (t.os.tag.isDarwin() and t.cpu.arch.isAARCH64()) {
         lib.addIncludePath(b.path("gen/macos-aarch64/include"));
         lib.addIncludePath(b.path("gen/macos-aarch64/include/crypto"));
         lib.addIncludePath(b.path("gen/macos-aarch64/include/openssl"));
@@ -163,7 +156,7 @@ fn libcrypto(
         });
     }
 
-    if (t.isDarwin() and t.cpu.arch == .x86_64) {
+    if (t.os.tag.isDarwin() and t.cpu.arch == .x86_64) {
         lib.addIncludePath(b.path("gen/macos-x86_64/include"));
         lib.addIncludePath(b.path("gen/macos-x86_64/include/crypto"));
         lib.addIncludePath(b.path("gen/macos-x86_64/include/openssl"));
@@ -329,7 +322,7 @@ fn libssl(
     lib.addIncludePath(dep.path("include/internal"));
     lib.addIncludePath(dep.path("include/openssl"));
 
-    if (t.isDarwin() and t.cpu.arch.isAARCH64()) {
+    if (t.os.tag.isDarwin() and t.cpu.arch.isAARCH64()) {
         lib.addIncludePath(b.path("gen/macos-aarch64/include"));
         lib.addIncludePath(b.path("gen/macos-aarch64/include/openssl"));
         lib.installHeadersDirectory(b.path("gen/macos-aarch64/include/openssl"), "openssl", .{});
@@ -341,7 +334,7 @@ fn libssl(
         lib.installHeadersDirectory(b.path("gen/linux-aarch64/include/openssl"), "openssl", .{});
     }
 
-    if (t.isDarwin() and t.cpu.arch == .x86_64) {
+    if (t.os.tag.isDarwin() and t.cpu.arch == .x86_64) {
         lib.addIncludePath(b.path("gen/macos-x86_64/include"));
         lib.addIncludePath(b.path("gen/macos-x86_64/include/openssl"));
         lib.installHeadersDirectory(b.path("gen/macos-x86_64/include/openssl"), "openssl", .{});
@@ -353,8 +346,8 @@ fn libssl(
         lib.installHeadersDirectory(b.path("gen/linux-x86_64/include/openssl"), "openssl", .{});
     }
 
-    lib.defineCMacro("OPENSSLDIR", "\"\"");
-    lib.defineCMacro("ENGINESDIR", "\"\"");
+    lib.root_module.addCMacro("OPENSSLDIR", "\"\"");
+    lib.root_module.addCMacro("ENGINESDIR", "\"\"");
 
     lib.addCSourceFiles(.{
         .root = dep.path(""),
diff --git a/ext/openssl/build.zig.zon b/ext/openssl/build.zig.zon
index 6d9fe0d23f..57d01714af 100644
--- a/ext/openssl/build.zig.zon
+++ b/ext/openssl/build.zig.zon
@@ -1,15 +1,16 @@
 .{
-    .name = "openssl",
+    .name = .openssl,
+    .fingerprint = 0x773a47f1e2d96f2e,
     .version = "0.0.1",
     .dependencies = .{
         .macos_sdk = .{
             .url = "https://github.com/joseluisq/macosx-sdks/releases/download/14.5/MacOSX14.5.sdk.tar.xz",
-            .hash = "122033a9c16c63f66ba4c83d6c61f487b06a6435ed57201eaccb4c5703ce4cdd956e",
+            .hash = "N-V-__8AAKtK4FMzqcFsY_ZrpMg9bGH0h7BqZDXtVyAerMtM",
             .lazy = true,
         },
         .openssl = .{
             .url = "https://github.com/openssl/openssl/releases/download/OpenSSL_1_1_1w/openssl-1.1.1w.tar.gz",
-            .hash = "122042b0a69fc3deee3c603b11046f15693046e5cfcf56858e028b9ea4dc4b78b81a",
+            .hash = "N-V-__8AANidegJCsKafw97uPGA7EQRvFWkwRuXPz1aFjgKL",
         },
     },
     .paths = .{
diff --git a/ext/openssl/gen/macos-aarch64/crypto/chacha/chacha-armv8.S b/ext/openssl/gen/macos-aarch64/crypto/chacha/chacha-armv8.S
index 81e4da5ac3..3bf82d69af 100644
--- a/ext/openssl/gen/macos-aarch64/crypto/chacha/chacha-armv8.S
+++ b/ext/openssl/gen/macos-aarch64/crypto/chacha/chacha-armv8.S
@@ -14,7 +14,7 @@ LOPENSSL_armcap_P:
 #ifdef	__ILP32__
 .long	_OPENSSL_armcap_P-.
 #else
-.quad	_OPENSSL_armcap_P-.
+.quad	ARMV7_NEON
 #endif
 .byte	67,104,97,67,104,97,50,48,32,102,111,114,32,65,82,77,118,56,44,32,67,82,89,80,84,79,71,65,77,83,32,98,121,32,60,97,112,112,114,111,64,111,112,101,110,115,115,108,46,111,114,103,62,0
 .align	2
diff --git a/ext/openssl/gen/macos-aarch64/crypto/poly1305/poly1305-armv8.S b/ext/openssl/gen/macos-aarch64/crypto/poly1305/poly1305-armv8.S
index 1729cec6d2..32e46864ed 100644
--- a/ext/openssl/gen/macos-aarch64/crypto/poly1305/poly1305-armv8.S
+++ b/ext/openssl/gen/macos-aarch64/crypto/poly1305/poly1305-armv8.S
@@ -863,7 +863,7 @@ LOPENSSL_armcap_P:
 #ifdef	__ILP32__
 .long	_OPENSSL_armcap_P-.
 #else
-.quad	_OPENSSL_armcap_P-.
+.quad	ARMV7_NEON
 #endif
 .byte	80,111,108,121,49,51,48,53,32,102,111,114,32,65,82,77,118,56,44,32,67,82,89,80,84,79,71,65,77,83,32,98,121,32,60,97,112,112,114,111,64,111,112,101,110,115,115,108,46,111,114,103,62,0
 .align	2
diff --git a/ext/openssl/gen/macos-aarch64/crypto/sha/sha1-armv8.S b/ext/openssl/gen/macos-aarch64/crypto/sha/sha1-armv8.S
index d64987d2fa..d5a5fc6d41 100644
--- a/ext/openssl/gen/macos-aarch64/crypto/sha/sha1-armv8.S
+++ b/ext/openssl/gen/macos-aarch64/crypto/sha/sha1-armv8.S
@@ -1214,7 +1214,7 @@ LOPENSSL_armcap_P:
 #ifdef	__ILP32__
 .long	_OPENSSL_armcap_P-.
 #else
-.quad	_OPENSSL_armcap_P-.
+.quad	ARMV7_NEON
 #endif
 .byte	83,72,65,49,32,98,108,111,99,107,32,116,114,97,110,115,102,111,114,109,32,102,111,114,32,65,82,77,118,56,44,32,67,82,89,80,84,79,71,65,77,83,32,98,121,32,60,97,112,112,114,111,64,111,112,101,110,115,115,108,46,111,114,103,62,0
 .align	2
diff --git a/ext/openssl/gen/macos-aarch64/crypto/sha/sha256-armv8.S b/ext/openssl/gen/macos-aarch64/crypto/sha/sha256-armv8.S
index 7936328dac..2439362b89 100644
--- a/ext/openssl/gen/macos-aarch64/crypto/sha/sha256-armv8.S
+++ b/ext/openssl/gen/macos-aarch64/crypto/sha/sha256-armv8.S
@@ -1069,7 +1069,7 @@ LOPENSSL_armcap_P:
 # ifdef	__ILP32__
 .long	_OPENSSL_armcap_P-.
 # else
-.quad	_OPENSSL_armcap_P-.
+.quad	ARMV7_NEON
 # endif
 #endif
 .byte	83,72,65,50,53,54,32,98,108,111,99,107,32,116,114,97,110,115,102,111,114,109,32,102,111,114,32,65,82,77,118,56,44,32,67,82,89,80,84,79,71,65,77,83,32,98,121,32,60,97,112,112,114,111,64,111,112,101,110,115,115,108,46,111,114,103,62,0
diff --git a/ext/openssl/gen/macos-aarch64/crypto/sha/sha512-armv8.S b/ext/openssl/gen/macos-aarch64/crypto/sha/sha512-armv8.S
index 2460c4ad45..aa812a09d1 100644
--- a/ext/openssl/gen/macos-aarch64/crypto/sha/sha512-armv8.S
+++ b/ext/openssl/gen/macos-aarch64/crypto/sha/sha512-armv8.S
@@ -1091,7 +1091,7 @@ LOPENSSL_armcap_P:
 # ifdef	__ILP32__
 .long	_OPENSSL_armcap_P-.
 # else
-.quad	_OPENSSL_armcap_P-.
+.quad	ARMV7_NEON
 # endif
 #endif
 .byte	83,72,65,53,49,50,32,98,108,111,99,107,32,116,114,97,110,115,102,111,114,109,32,102,111,114,32,65,82,77,118,56,44,32,67,82,89,80,84,79,71,65,77,83,32,98,121,32,60,97,112,112,114,111,64,111,112,101,110,115,115,108,46,111,114,103,62,0
diff --git a/ext/pdjson/build.zig.zon b/ext/pdjson/build.zig.zon
index 142e2d3e30..1774d5b1a6 100644
--- a/ext/pdjson/build.zig.zon
+++ b/ext/pdjson/build.zig.zon
@@ -4,7 +4,7 @@
     .dependencies = .{
         .pdjson = .{
             .url = "https://github.com/skeeto/pdjson/archive/67108d883061043e55d0fb13961ac1b6fc8a485c.tar.gz",
-            .hash = "1220a7789c7b4539bd1ee8bb182609d9076ff19fc25026c9a61ca2df624d3170a7b0",
+            .hash = "N-V-__8AADC9AACneJx7RTm9Hui7GCYJ2Qdv8Z_CUCbJphyi",
         },
     },
     .paths = .{
diff --git a/ext/sigsegv/build.zig b/ext/sigsegv/build.zig
index cfc7c0f6cb..d7f885967b 100644
--- a/ext/sigsegv/build.zig
+++ b/ext/sigsegv/build.zig
@@ -16,7 +16,7 @@ pub fn build(b: *std.Build) void {
         .optimize = optimize,
     });
 
-    if (target.result.isDarwin() and !target.query.isNative()) {
+    if (target.result.os.tag.isDarwin() and !target.query.isNative()) {
         const macos_sdk = b.lazyDependency("macos_sdk", .{
             .target = target,
             .optimize = optimize,
@@ -30,7 +30,7 @@ pub fn build(b: *std.Build) void {
 
     lib.linkLibC();
 
-    lib.defineCMacro("HAVE_CONFIG_H", null);
+    lib.root_module.addCMacro("HAVE_CONFIG_H", &[_]u8{});
 
     const config_h = b.addConfigHeader(.{
         .style = .{
diff --git a/ext/sigsegv/build.zig.zon b/ext/sigsegv/build.zig.zon
index 1ef5aaafd7..39f2c583a2 100644
--- a/ext/sigsegv/build.zig.zon
+++ b/ext/sigsegv/build.zig.zon
@@ -4,12 +4,12 @@
     .dependencies = .{
         .macos_sdk = .{
             .url = "https://github.com/joseluisq/macosx-sdks/releases/download/14.5/MacOSX14.5.sdk.tar.xz",
-            .hash = "122033a9c16c63f66ba4c83d6c61f487b06a6435ed57201eaccb4c5703ce4cdd956e",
+            .hash = "N-V-__8AAKtK4FMzqcFsY_ZrpMg9bGH0h7BqZDXtVyAerMtM",
             .lazy = true,
         },
         .sigsegv = .{
-            .url = "https://ftp.gnu.org/gnu/libsigsegv/libsigsegv-2.14.tar.gz",
-            .hash = "122082332294b5084ed0032c635f36227fb0408c175617a73aa9798036ead4c22c79",
+            .url = "https://ftp.fr.openbsd.org/pub/OpenBSD/distfiles/libsigsegv-2.14.tar.gz",
+            .hash = "N-V-__8AAHQhHwCCMyKUtQhO0AMsY182In-wQIwXVhenOql5",
         },
     },
     .paths = .{
diff --git a/ext/softblas/build.zig.zon b/ext/softblas/build.zig.zon
index 431171b53b..a05aa5f8e8 100644
--- a/ext/softblas/build.zig.zon
+++ b/ext/softblas/build.zig.zon
@@ -7,7 +7,7 @@
         },
         .softblas = .{
             .url = "https://github.com/urbit/SoftBLAS/archive/cbffb33f19ea02f9ffbd184d445123c57929ec53.tar.gz",
-            .hash = "1220617c11d869ef2316571a430f51f93470e2d714141deb3bdfaa6b578cf151f258",
+            .hash = "N-V-__8AAJD5MgBhfBHYae8jFlcaQw9R-TRw4tcUFB3rO9-q",
         },
     },
     .paths = .{
diff --git a/ext/softfloat/build.zig.zon b/ext/softfloat/build.zig.zon
index fcb318807a..11f753d89d 100644
--- a/ext/softfloat/build.zig.zon
+++ b/ext/softfloat/build.zig.zon
@@ -4,7 +4,7 @@
     .dependencies = .{
         .softfloat = .{
             .url = "https://github.com/ucb-bar/berkeley-softfloat-3/archive/5c06db33fc1e2130f67c045327b0ec949032df1d.tar.gz",
-            .hash = "1220a4d2ebf2da3f160133eb6caf4a99b9e7b9879820de8f3bd9e56b2448c5688a07",
+            .hash = "N-V-__8AAJjNHACk0uvy2j8WATPrbK9KmbnnuYeYIN6PO9nl",
         },
     },
     .paths = .{
diff --git a/ext/unwind/build.zig.zon b/ext/unwind/build.zig.zon
index 1ec070d557..5ebfff4aad 100644
--- a/ext/unwind/build.zig.zon
+++ b/ext/unwind/build.zig.zon
@@ -4,7 +4,7 @@
     .dependencies = .{
         .unwind = .{
             .url = "https://github.com/libunwind/libunwind/archive/7cc4c20fbcf65a9c855fb9d950fad8d0e29b092e.tar.gz",
-            .hash = "1220c7280ef49dc581a2f8ba029c58380410b9bbb1701afacba13205324d2ec8225a",
+            .hash = "N-V-__8AAA54RADHKA70ncWBovi6ApxYOAQQubuxcBr6y6Ey",
         },
     },
     .paths = .{
diff --git a/ext/urcrypt/build.zig.zon b/ext/urcrypt/build.zig.zon
index a7866adde4..e32b027102 100644
--- a/ext/urcrypt/build.zig.zon
+++ b/ext/urcrypt/build.zig.zon
@@ -4,18 +4,18 @@
     .dependencies = .{
         .aes_siv = .{
             .url = "https://github.com/dfoxfranke/libaes_siv/archive/9681279cfaa6e6399bb7ca3afbbc27fc2e19df4b.tar.gz",
-            .hash = "1220a898068525a4bda3be4139c68555ec3a9cef03ed94c63115dde4a5204126f69a",
+            .hash = "N-V-__8AADRgAQComAaFJaS9o75BOcaFVew6nO8D7ZTGMRXd",
         },
         .openssl = .{
             .path = "../openssl",
         },
         .secp256k1 = .{
             .url = "https://github.com/bitcoin-core/secp256k1/archive/refs/tags/v0.5.1.tar.gz",
-            .hash = "1220bb683a6df744e618f58a008eaae3eb62b70a78334cec676bd82b1b9e8e944eeb",
+            .hash = "N-V-__8AAJ4DSwC7aDpt90TmGPWKAI6q4-titwp4M0zsZ2vY",
         },
         .urcrypt = .{
             .url = "https://github.com/urbit/urcrypt/archive/465aad6262f2710f76f75adfe74effb5751c5ab3.tar.gz",
-            .hash = "1220c0f7141ab0aeb4164c5c2ae42848035e5b2fdff52c66c57d5744e3e3751e12c8",
+            .hash = "N-V-__8AAL3OSQDA9xQasK60FkxcKuQoSANeWy_f9SxmxX1X",
         },
     },
     .paths = .{
diff --git a/ext/wasm3/build.zig.zon b/ext/wasm3/build.zig.zon
index 55d9473907..d669115ee0 100644
--- a/ext/wasm3/build.zig.zon
+++ b/ext/wasm3/build.zig.zon
@@ -8,7 +8,7 @@
         .wasm3 = .{
             // .path = "../../../../wasm3"
             .url = "https://github.com/urbit/wasm3/archive/5b74cbca01793cda71ebf707b0587616c32cc88c.tar.gz",
-            .hash = "12200fb06246d1956d73684cddbf84e819e4a0d7b1817bf5934b836466d194e3c60d",
+            .hash = "N-V-__8AAMKiSAAPsGJG0ZVtc2hM3b-E6BnkoNexgXv1k0uD",
         },
     },
     .paths = .{
diff --git a/ext/whereami/build.zig.zon b/ext/whereami/build.zig.zon
index 82294555eb..42cb792b2e 100644
--- a/ext/whereami/build.zig.zon
+++ b/ext/whereami/build.zig.zon
@@ -4,7 +4,7 @@
     .dependencies = .{
         .whereami = .{
             .url = "https://github.com/gpakosz/whereami/archive/ba364cd54fd431c76c045393b6522b4bff547f50.tar.gz",
-            .hash = "122044406f3ffcdba6c41cdcbf8c2cfe3197db3560c6f1baa7a82c651a8a20dac35b",
+            .hash = "N-V-__8AALQtAQBEQG8__NumxBzcv4ws_jGX2zVgxvG6p6gs",
         },
     },
     .paths = .{
diff --git a/pkg/c3/build.zig b/pkg/c3/build.zig
index 866007559f..387a3bcd0c 100644
--- a/pkg/c3/build.zig
+++ b/pkg/c3/build.zig
@@ -13,7 +13,7 @@ pub fn build(b: *std.Build) void {
         .optimize = optimize,
     });
 
-    if (target.result.isDarwin() and !target.query.isNative()) {
+    if (target.result.os.tag.isDarwin() and !target.query.isNative()) {
         const macos_sdk = b.lazyDependency("macos_sdk", .{
             .target = target,
             .optimize = optimize,
diff --git a/pkg/c3/build.zig.zon b/pkg/c3/build.zig.zon
index 4e62a8027c..857a5164dc 100644
--- a/pkg/c3/build.zig.zon
+++ b/pkg/c3/build.zig.zon
@@ -4,7 +4,7 @@
     .dependencies = .{
         .macos_sdk = .{
             .url = "https://github.com/joseluisq/macosx-sdks/releases/download/14.5/MacOSX14.5.sdk.tar.xz",
-            .hash = "122033a9c16c63f66ba4c83d6c61f487b06a6435ed57201eaccb4c5703ce4cdd956e",
+            .hash = "N-V-__8AAKtK4FMzqcFsY_ZrpMg9bGH0h7BqZDXtVyAerMtM",
             .lazy = true,
         },
     },
diff --git a/pkg/noun/build.zig b/pkg/noun/build.zig
index c46f1029ab..1e7ffd947f 100644
--- a/pkg/noun/build.zig
+++ b/pkg/noun/build.zig
@@ -14,7 +14,7 @@ pub fn build(b: *std.Build) !void {
         .optimize = optimize,
     });
 
-    if (target.result.isDarwin() and !target.query.isNative()) {
+    if (target.result.os.tag.isDarwin() and !target.query.isNative()) {
         const macos_sdk = b.lazyDependency("macos_sdk", .{
             .target = target,
             .optimize = optimize,
@@ -139,7 +139,7 @@ pub fn build(b: *std.Build) !void {
     var flags = std.ArrayList([]const u8).init(b.allocator);
     defer flags.deinit();
     try flags.appendSlice(&.{
-        "-pedantic",
+        // "-pedantic",
         "-std=gnu23",
     });
     try flags.appendSlice(copts);
diff --git a/pkg/noun/build.zig.zon b/pkg/noun/build.zig.zon
index 3982a2a467..7b4c408a16 100644
--- a/pkg/noun/build.zig.zon
+++ b/pkg/noun/build.zig.zon
@@ -4,7 +4,7 @@
     .dependencies = .{
         .macos_sdk = .{
             .url = "https://github.com/joseluisq/macosx-sdks/releases/download/14.5/MacOSX14.5.sdk.tar.xz",
-            .hash = "122033a9c16c63f66ba4c83d6c61f487b06a6435ed57201eaccb4c5703ce4cdd956e",
+            .hash = "N-V-__8AAKtK4FMzqcFsY_ZrpMg9bGH0h7BqZDXtVyAerMtM",
             .lazy = true,
         },
         .pkg_c3 = .{
@@ -51,7 +51,7 @@
         },
         .zlib = .{
             .url = "https://github.com/allyourcodebase/zlib/archive/0918e87b7629b9c6a50a08edd0ce30d849758faf.tar.gz",
-            .hash = "122034ab2a12adf8016ffa76e48b4be3245ffd305193edba4d83058adbcfa749c107",
+            .hash = "zlib-1.3.1-AAAAACEMAAA0qyoSrfgBb_p25ItL4yRf_TBRk-26TYMF",
         },
         .wasm3 = .{
             .path = "../../ext/wasm3",
diff --git a/pkg/noun/urth.c b/pkg/noun/urth.c
index 6eb6f8fcc3..81c542da8a 100644
--- a/pkg/noun/urth.c
+++ b/pkg/noun/urth.c
@@ -12,6 +12,7 @@
 #include "imprison.h"
 #include "jets.h"
 #include "manage.h"
+#include "options.h"
 #include "retrieve.h"
 #include "serial.h"
 #include "ur/ur.h"
@@ -460,6 +461,136 @@ u3u_meld(void)
 }
 #endif
 
+/* BEGIN helper functions for u3u_melt
+   -------------------------------------------------------------------
+*/
+/* _cj_warm_tap(): tap war_p to rel
+*/
+static void
+_cj_warm_tap(u3_noun kev, void* wit)
+{
+  u3_noun* rel = wit;
+  *rel = u3nc(u3k(kev), *rel);
+}
+
+static inline u3_weak
+_cu_melt_get(u3p(u3h_root) set_p, u3_noun som)
+{
+  u3_post hav_p = u3h_git(set_p, som);
+
+  if ( u3_none == hav_p ) {
+    return u3_none;
+  }
+
+  //  restore tag bits from [som]
+  //
+  return (hav_p >> u3a_vits) | (som & 0xc0000000);
+}
+
+static inline void
+_cu_melt_put(u3p(u3h_root) set_p, u3_noun som)
+{
+  //  strip tag bits from [som] to skip refcounts
+  //
+  u3_post hav_p = u3a_to_off(som);
+  u3h_put(set_p, som, hav_p);
+}
+
+static void
+_cu_melt_noun(u3p(u3h_root) set_p, u3_noun* mos)
+{
+  u3_noun som = *mos;
+  u3_weak hav;
+
+  //  skip direct atoms
+  //
+  if ( c3y == u3a_is_cat(som) ) {
+    return;
+  }
+
+  //  [som] equals [hav], and [hav] is canonical
+  //
+  if ( u3_none != (hav = _cu_melt_get(set_p, som)) ) {
+    if ( hav != som ) {
+      u3z(som);
+      *mos = u3k(hav);
+    }
+    return;
+  }
+
+  //  traverse subtrees
+  //
+  if ( c3y == u3a_is_cell(som) ) {
+    u3a_cell *cel_u = u3a_to_ptr(som);
+    _cu_melt_noun(set_p, &cel_u->hed);
+    _cu_melt_noun(set_p, &cel_u->tel);
+  }
+
+  //  [som] is canonical
+  //
+  _cu_melt_put(set_p, som);
+}
+
+/* u3u_melt(): globally deduplicate memory and pack in-place.
+*/
+c3_w
+u3u_melt(void)
+{
+  c3_w pre_w = u3a_open(u3R);
+
+  // Verify that we're on the main road.
+  //
+  u3_assert( &(u3H->rod_u) == u3R );
+
+  // Store a cons list of the cold jet registrations in `cod`
+  //
+  u3_noun cod = u3_nul;
+  u3h_walk_with(u3R->jed.cod_p, _cj_warm_tap, &cod);
+
+  u3m_reclaim();     // refresh the byte-code interpreter.
+
+  u3h_free(u3R->cax.per_p);
+  u3R->cax.per_p = u3h_new_cache(u3C.per_w);
+
+  u3h_free(u3R->jed.cod_p);
+  u3R->jed.cod_p = u3h_new();
+
+  {
+    u3p(u3h_root) set_p = u3h_new(); // temp hashtable
+
+    _cu_melt_noun(set_p, &cod);      // melt the jets
+    _cu_melt_noun(set_p, &u3A->roc); // melt the kernel
+
+    u3h_free(set_p);  // release the temp hashtable
+  }
+
+  // re-initialize the jets
+  //
+  u3j_boot(c3y);
+
+  // Put the jet registrations back. Loop over cod putting them back into the cold jet
+  // dashboard. Then re-run the garbage collector.
+  //
+  {
+    u3_noun codc = cod;
+
+    while(u3_nul != cod) {
+      u3_noun kev = u3h(cod);
+      u3h_put(u3R->jed.cod_p, u3h(kev), u3k(u3t(kev)));
+      cod = u3t(cod);
+    }
+
+    u3z(codc);
+  }
+
+  // remove free space
+  //
+  u3j_ream();
+  u3m_pack();
+
+  return (u3a_open(u3R) - pre_w);
+}
+
 /* _cu_rock_path(): format rock path.
 */
 static c3_o
diff --git a/pkg/noun/urth.h b/pkg/noun/urth.h
index e2ab3e6f44..a11b9aa824 100644
--- a/pkg/noun/urth.h
+++ b/pkg/noun/urth.h
@@ -10,7 +10,12 @@
       /* u3u_meld(): globally deduplicate memory, returns u3a_open delta.
       */
         c3_w
-        u3u_meld(void);
+        u3u_meld(void) __attribute__ ((deprecated));
+
+      /* u3u_melt(): globally deduplicate memory and pack in-place.
+      */
+        c3_w
+        u3u_melt(void) __attribute__ ((deprecated));
 
       /* u3u_cram(): globably deduplicate memory, and write a rock to disk.
       */
diff --git a/pkg/vere/build.zig b/pkg/vere/build.zig
index cb1668e175..119907ccbd 100644
--- a/pkg/vere/build.zig
+++ b/pkg/vere/build.zig
@@ -18,7 +18,7 @@ pub fn build(b: *std.Build) !void {
         .optimize = optimize,
     });
 
-    if (target.result.isDarwin() and !target.query.isNative()) {
+    if (target.result.os.tag.isDarwin() and !target.query.isNative()) {
         const macos_sdk = b.lazyDependency("macos_sdk", .{
             .target = target,
             .optimize = optimize,
@@ -224,6 +224,7 @@ const c_source_files = [_][]const u8{
     "lord.c",
     "mars.c",
     "mdns.c",
+    "melt.c",
     "newt.c",
     "pier.c",
     "save.c",
diff --git a/pkg/vere/build.zig.zon b/pkg/vere/build.zig.zon
index bfcac8e59a..f368d3c55c 100644
--- a/pkg/vere/build.zig.zon
+++ b/pkg/vere/build.zig.zon
@@ -4,7 +4,7 @@
     .dependencies = .{
         .macos_sdk = .{
             .url = "https://github.com/joseluisq/macosx-sdks/releases/download/14.5/MacOSX14.5.sdk.tar.xz",
-            .hash = "122033a9c16c63f66ba4c83d6c61f487b06a6435ed57201eaccb4c5703ce4cdd956e",
+            .hash = "N-V-__8AAKtK4FMzqcFsY_ZrpMg9bGH0h7BqZDXtVyAerMtM",
             .lazy = true,
         },
         .pkg_c3 = .{
@@ -48,7 +48,7 @@
         },
         .zlib = .{
             .url = "https://github.com/allyourcodebase/zlib/archive/0918e87b7629b9c6a50a08edd0ce30d849758faf.tar.gz",
-            .hash = "122034ab2a12adf8016ffa76e48b4be3245ffd305193edba4d83058adbcfa749c107",
+            .hash = "zlib-1.3.1-AAAAACEMAAA0qyoSrfgBb_p25ItL4yRf_TBRk-26TYMF",
         },
     },
     .paths = .{
diff --git a/pkg/vere/main.c b/pkg/vere/main.c
index a8469c10b8..f4463111d2 100644
--- a/pkg/vere/main.c
+++ b/pkg/vere/main.c
@@ -800,7 +800,8 @@ _cw_usage(c3_c* bin_c)
     "  %s dock %.*s              copy binary:\n",
     "  %s grab %.*s              measure memory usage:\n",
     "  %s info %.*s              print pier info:\n",
-    "  %s meld %.*s              deduplicate snapshot:\n",
+    "  %s meld %.*s              deduplicate and minimize snapshot:\n",
+    "  %s melt %.*s              deduplicate snapshot:\n",
     "  %s pack %.*s              defragment snapshot:\n",
     "  %s play %.*s              recompute events:\n",
     "  %s prep %.*s              prepare for upgrade:\n",
@@ -2005,7 +2006,7 @@ _cw_queu(c3_i argc, c3_c* argv[])
   }
 }
 
-/* _cw_uniq(): deduplicate persistent nouns
+/* _cw_meld(): canonicalize persistent nouns and compact state.
 */
 static void
 _cw_meld(c3_i argc, c3_c* argv[])
@@ -2094,7 +2095,95 @@ _cw_meld(c3_i argc, c3_c* argv[])
   u3_Host.eve_d = u3m_boot(u3_Host.dir_c, (size_t)1 << u3_Host.ops_u.lom_y);
   u3_disk* log_u = _cw_disk_init(u3_Host.dir_c); // XX s/b try_aquire lock
 
-  u3a_print_memory(stderr, "urbit: meld: gained", u3u_meld());
+  u3a_print_memory(stderr, "urbit: meld: gained", u3_meld_all(stderr));
+
+  u3m_save();
+  u3_disk_exit(log_u);
+  u3m_stop();
+}
+
+/* _cw_melt(): canonicalize persistent nouns.
+*/
+static void
+_cw_melt(c3_i argc, c3_c* argv[])
+{
+  c3_i ch_i, lid_i;
+  c3_w arg_w;
+
+  static struct option lop_u[] = {
+    { "loom",      required_argument, NULL, c3__loom },
+    { "no-demand", no_argument,       NULL, 6 },
+    { "swap",      no_argument,       NULL, 7 },
+    { "swap-to",   required_argument, NULL, 8 },
+    { "gc-early",  no_argument,       NULL, 9 },
+    { NULL, 0, NULL, 0 }
+  };
+
+  u3_Host.dir_c = _main_pier_run(argv[0]);
+
+  while ( -1 != (ch_i=getopt_long(argc, argv, "", lop_u, &lid_i)) ) {
+    switch ( ch_i ) {
+      case c3__loom: {
+        if (_main_readw_loom("loom", &u3_Host.ops_u.lom_y)) {
+          exit(1);
+        }
+      } break;
+
+      case 6: {  //  no-demand
+        u3_Host.ops_u.map = c3n;
+        u3C.wag_w |= u3o_no_demand;
+      } break;
+
+      case 7: {  //  swap
+        u3_Host.ops_u.eph = c3y;
+        u3C.wag_w |= u3o_swap;
+      } break;
+
+      case 8: {  //  swap-to
+        u3_Host.ops_u.eph = c3y;
+        u3C.wag_w |= u3o_swap;
+        u3C.eph_c = strdup(optarg);
+        break;
+      }
+
+      case 9: {  //  gc-early
+        u3C.wag_w |= u3o_check_corrupt;
+        break;
+      }
+
+      case '?': {
+        fprintf(stderr, "invalid argument\r\n");
+        exit(1);
+      } break;
+    }
+  }
+
+  //  argv[optind] is always "melt"
+  //
+
+  if ( !u3_Host.dir_c ) {
+    if ( optind + 1 < argc ) {
+      u3_Host.dir_c = argv[optind + 1];
+    }
+    else {
+      fprintf(stderr, "invalid command, pier required\r\n");
+      exit(1);
+    }
+
+    optind++;
+  }
+
+  if ( optind + 1 != argc ) {
+    fprintf(stderr, "invalid command\r\n");
+    exit(1);
+  }
+
+  u3C.wag_w |= u3o_hashless;
+
+  u3_Host.eve_d = u3m_boot(u3_Host.dir_c, (size_t)1 << u3_Host.ops_u.lom_y);
+  u3_disk* log_u = _cw_disk_init(u3_Host.dir_c); // XX s/b try_aquire lock
+
+  u3a_print_memory(stderr, "urbit: melt: gained", u3_melt_all(stderr));
 
   u3m_save();
   u3_disk_exit(log_u);
@@ -3147,6 +3236,7 @@ _cw_utils(c3_i argc, c3_c* argv[])
 
     case c3__info: _cw_info(argc, argv); return 1;
     case c3__meld: _cw_meld(argc, argv); return 1;
+    case c3__melt: _cw_melt(argc, argv); return 1;
     case c3__next: _cw_next(argc, argv); return 2; // continue on
     case c3__pack: _cw_pack(argc, argv); return 1;
     case c3__play: _cw_play(argc, argv); return 1;
diff --git a/pkg/vere/mars.c b/pkg/vere/mars.c
index 6d4af05420..17588c4ff1 100644
--- a/pkg/vere/mars.c
+++ b/pkg/vere/mars.c
@@ -190,24 +190,24 @@ _mars_do_boot(u3_disk* log_u, c3_d eve_d)
   //
   //    XX support -J
   //
-  {
-    c3_d  len_d = u3_Ivory_pill_len;
-    c3_y* byt_y = u3_Ivory_pill;
-    u3_cue_xeno* sil_u = u3s_cue_xeno_init_with(ur_fib27, ur_fib28);
-    u3_weak pil;
+  /* { */
+  /*   c3_d  len_d = u3_Ivory_pill_len; */
+  /*   c3_y* byt_y = u3_Ivory_pill; */
+  /*   u3_cue_xeno* sil_u = u3s_cue_xeno_init_with(ur_fib27, ur_fib28); */
+  /*   u3_weak pil; */
 
-    if ( u3_none == (pil = u3s_cue_xeno_with(sil_u, len_d, byt_y)) ) {
-      u3l_log("lite: unable to cue ivory pill");
-      exit(1);
-    }
+  /*   if ( u3_none == (pil = u3s_cue_xeno_with(sil_u, len_d, byt_y)) ) { */
+  /*     u3l_log("lite: unable to cue ivory pill"); */
+  /*     exit(1); */
+  /*   } */
 
-    u3s_cue_xeno_done(sil_u);
+  /*   u3s_cue_xeno_done(sil_u); */
 
-    if ( c3n == u3v_boot_lite(pil)) {
-      u3l_log("lite: boot failed");
-      exit(1);
-    }
-  }
+  /*   if ( c3n == u3v_boot_lite(pil)) { */
+  /*     u3l_log("lite: boot failed"); */
+  /*     exit(1); */
+  /*   } */
+  /* } */
 
   u3l_log("--------------- bootstrap starting ----------------");
 
@@ -349,7 +349,7 @@ u3_mars_play(u3_mars* mar_u, c3_d eve_d, c3_d sap_d)
           //  XX pack before meld?
           //
           if ( u3C.wag_w & u3o_auto_meld ) {
-            u3a_print_memory(stderr, "mars: meld: gained", u3u_meld());
+            u3a_print_memory(stderr, "mars: meld: gained", u3_meld_all(stderr));
           }
           else {
             u3a_print_memory(stderr, "mars: pack: gained", u3m_pack());
diff --git a/pkg/vere/melt.c b/pkg/vere/melt.c
new file mode 100644
index 0000000000..113a08c317
--- /dev/null
+++ b/pkg/vere/melt.c
@@ -0,0 +1,217 @@
+#include "allocate.h"
+#include "hashtable.h"
+#include "jets.h"
+#include "options.h"
+#include "retrieve.h"
+#include "vortex.h"
+
+static c3_d
+_melt_hash(u3_noun foo)
+{
+  return u3r_mug(foo) * 11400714819323198485ULL;
+}
+
+static c3_i
+_melt_cmp_atoms(u3_atom a, u3_atom b)
+{
+  if ( a == b ) return 1;
+
+  //  XX assume(c3y == u3a_is_pug(a) && c3y == u3a_is_pug(b))
+  u3a_atom *a_u = u3a_to_ptr(a);
+  u3a_atom *b_u = u3a_to_ptr(b);
+
+  //  XX assume( a_u->mug_w && b_u->mug_w )
+  if ( a_u->mug_w != b_u->mug_w ) return 0;
+
+  if ( a_u->len_w != b_u->len_w ) return 0;
+
+  return 0 == memcmp(a_u->buf_w, b_u->buf_w, a_u->len_w << 2);
+}
+
+#define NAME    _coins
+#define KEY_TY  u3_atom
+#define HASH_FN _melt_hash
+#define CMPR_FN _melt_cmp_atoms
+#include "verstable.h"
+
+static c3_i
+_melt_cmp_cells(u3_cell a, u3_cell b)
+{
+  if ( a == b ) return 1;
+
+  u3a_cell *a_u = u3a_to_ptr(a);
+  u3a_cell *b_u = u3a_to_ptr(b);
+
+  //  XX assume( a_u->mug_w && b_u->mug_w )
+  if ( a_u->mug_w != b_u->mug_w ) return 0;
+
+  c3_d *a_d = (c3_d*)&(a_u->hed);
+  c3_d *b_d = (c3_d*)&(b_u->hed);
+
+  return *a_d == *b_d;
+}
+
+#define NAME    _cells
+#define KEY_TY  u3_cell
+#define HASH_FN _melt_hash
+#define CMPR_FN _melt_cmp_cells
+#include "verstable.h"
+
+typedef struct {
+  _coins  vat_u;
+  _cells  cel_u;
+  c3_w    len_w;
+  c3_w    siz_w;
+  u3_noun *tac;
+} _melt_ctx;
+
+static u3_noun
+_melt_canon_next(_melt_ctx *can_u, u3_noun som)
+{
+  _coins_itr vit_u;
+  _cells_itr cit_u;
+
+  while ( 1 ) {
+    if ( c3y == u3a_is_cat(som) ) return som;
+
+    if ( c3n == u3a_is_cell(som) ) {
+      vit_u  = vt_get_or_insert(&can_u->vat_u, som);
+      u3_assert( !vt_is_end(vit_u) ); // OOM
+      return vit_u.data->key;
+    }
+
+    cit_u = vt_get(&can_u->cel_u, som);
+    if ( !vt_is_end(cit_u) ) return cit_u.data->key;
+
+    if ( can_u->len_w == can_u->siz_w ) {
+      can_u->siz_w += c3_min(can_u->siz_w, 1024);
+      can_u->tac    = c3_realloc(can_u->tac, sizeof(*can_u->tac) * can_u->siz_w);
+    }
+
+    can_u->tac[can_u->len_w++] = u3a_to_off(som) >> u3a_vits;
+    som = u3h(som);
+    continue;
+  }
+}
+
+static inline void __attribute__((always_inline))
+_melt_xchange(u3_noun new, u3_noun *som)
+{
+  u3_noun old = *som;
+
+  if ( old != new ) {
+    *som = u3k(new);
+    u3z(old);
+  }
+}
+
+static u3_noun
+_melt_canon(_melt_ctx *can_u, u3_noun can)
+{
+  _cells_itr cit_u;
+  u3a_cell  *cel_u;
+  u3_noun     *top;
+
+  can_u->len_w = 0;
+
+  can = _melt_canon_next(can_u, can);
+
+  while ( can_u->len_w ) {
+    top = &(can_u->tac[can_u->len_w - 1]);
+
+    if ( !(*top >> 31) ) {                       // head frame
+      cel_u = u3to(u3a_cell, *top << u3a_vits);
+      _melt_xchange(can, &cel_u->hed);
+      *top |= 1U << 31;                          // tail frame
+      can   = _melt_canon_next(can_u, cel_u->tel);
+    }
+    else {
+      *top  &= (1U << 31) - 1;
+      *top <<= u3a_vits;
+      cel_u  = u3to(u3a_cell, *top);
+      _melt_xchange(can, &cel_u->tel);
+      cit_u  = vt_get_or_insert(&can_u->cel_u, u3a_to_pom(*top));
+      u3_assert( !vt_is_end(cit_u) ); // OOM
+      can    = cit_u.data->key;
+
+      can_u->len_w--;
+    }
+  }
+
+  return can;
+}
+
+static void
+_melt_canon_ptr(_melt_ctx *can_u, u3_noun *som)
+{
+  u3_noun can = _melt_canon(can_u, *som);
+  _melt_xchange(can, som);
+}
+
+static void
+_melt_walk_hamt(u3_noun kev, void* ptr_v)
+{
+  _melt_ctx *can_u = ptr_v;
+  (void)_melt_canon(can_u, kev);
+}
+
+c3_w
+u3_melt_all(FILE *fil_u)
+{
+  c3_w     pre_w = u3a_idle(u3R);
+  _melt_ctx can_u = {0};
+
+  // Verify that we're on the main road.
+  //
+  u3_assert( &(u3H->rod_u) == u3R );
+
+  can_u.siz_w = 32;
+  can_u.tac   = c3_malloc(sizeof(*can_u.tac) * can_u.siz_w);
+
+  vt_init(&can_u.vat_u);
+  vt_init(&can_u.cel_u);
+
+  u3m_reclaim();
+
+  //  XX packed struct
+  //
+  {
+    u3_noun roc = u3A->roc;
+    _melt_canon_ptr(&can_u, &roc);
+    u3A->roc = roc;
+  }
+
+  u3h_walk_with(u3R->jed.cod_p, _melt_walk_hamt, &can_u);
+  u3h_walk_with(u3R->cax.per_p, _melt_walk_hamt, &can_u);
+
+  u3j_boot(c3n);
+  u3j_ream();
+
+  if ( fil_u ) {
+    fprintf(fil_u, "atoms (%zu)", vt_size(&can_u.vat_u));
+    u3a_print_memory(fil_u, "", (c3_w)vt_bucket_count(&can_u.vat_u));
+    fprintf(fil_u, "cells (%zu)", vt_size(&can_u.cel_u));
+    u3a_print_memory(fil_u, "", (c3_w)vt_bucket_count(&can_u.cel_u));
+  }
+
+  vt_cleanup(&can_u.vat_u);
+  vt_cleanup(&can_u.cel_u);
+
+  c3_free(can_u.tac);
+
+  return u3a_idle(u3R) - pre_w;
+}
+
+c3_w
+u3_meld_all(FILE *fil_u)
+{
+  c3_w pre_w = u3a_open(u3R);
+
+  u3h_free(u3R->cax.per_p);
+  u3R->cax.per_p = u3h_new_cache(u3C.per_w);
+
+  (void)u3_melt_all(fil_u);
+  (void)u3m_pack();
+
+  return u3a_open(u3R) - pre_w;
+}
diff --git a/pkg/vere/serf.c b/pkg/vere/serf.c
index 4ea6cebfb2..38b5494e70 100644
--- a/pkg/vere/serf.c
+++ b/pkg/vere/serf.c
@@ -1069,7 +1069,7 @@ u3_serf_live(u3_serf* sef_u, u3_noun com, u3_noun* ret)
       }
       else {
         u3z(com);
-        u3a_print_memory(stderr, "serf: meld: gained", u3u_meld());
+        u3a_print_memory(stderr, "serf: meld: gained", u3_meld_all(stderr));
         *ret = u3nc(c3__live, u3_nul);
         return c3y;
       }
diff --git a/pkg/vere/vere.h b/pkg/vere/vere.h
index afc3571584..3aced7b491 100644
--- a/pkg/vere/vere.h
+++ b/pkg/vere/vere.h
@@ -1607,4 +1607,14 @@
         c3_w
         u3_readdir_r(DIR *dirp, struct dirent *entry, struct dirent **result);
 
+      /* u3_melt_all(): canonicalize persistent state
+      */
+        c3_w
+        u3_melt_all(FILE*);
+
+      /* u3_meld_all(): canonicalize persistent nouns and compact state.
+      */
+        c3_w
+        u3_meld_all(FILE*);
+
 #endif /* ifndef U3_VERE_H */