diff --git a/packages/synthetic-chain/cli.ts b/packages/synthetic-chain/cli.ts
index 1ace67c5..828f574f 100755
--- a/packages/synthetic-chain/cli.ts
+++ b/packages/synthetic-chain/cli.ts
@@ -4,10 +4,13 @@ import { parseArgs } from 'node:util';
 import path from 'node:path';
 import { execSync } from 'node:child_process';
 import { buildProposalSubmissions, buildTestImages } from './src/cli/build.js';
-import { refreshDockerfile } from './src/cli/dockerfileGen.js';
+import { writeDockerfile } from './src/cli/dockerfileGen.js';
 import { matchOneProposal, readProposals } from './src/cli/proposals.js';
 import { debugTestImage, runTestImages } from './src/cli/run.js';
 
+// Tag of the agoric-3 image containing all passed proposals
+const baseTag = 'main';
+
 const { positionals, values } = parseArgs({
   options: {
     match: { short: 'm', type: 'string' },
@@ -28,20 +31,33 @@ const [cmd] = positionals;
 
 // TODO consider a lib like Commander for auto-gen help
 const usage = `USAGE:
-build
+append [<tag>]  - build on top of an existing image (defaults to latest from a3p)
+
+rebuild         - build from the beginning
 
-test [--debug]
+test [--debug]  - run the tests of the proposals
 `;
 
+const buildImages = () => {
+  execSync(
+    // XXX very brittle
+    'cp -r node_modules/@agoric/synthetic-chain/upgrade-test-scripts .',
+  );
+  buildProposalSubmissions(proposals);
+  buildTestImages(proposals, values.dry);
+};
+
 switch (cmd) {
-  case 'build':
-    execSync(
-      // XXX very brittle
-      'cp -r node_modules/@agoric/synthetic-chain/upgrade-test-scripts .',
-    );
-    refreshDockerfile(allProposals);
-    buildProposalSubmissions(proposals);
-    buildTestImages(proposals, values.dry);
+  case 'amend': // alias for backcompat
+  case 'append':
+    const fromTag = positionals[1] || baseTag;
+    writeDockerfile(allProposals, fromTag);
+    buildImages();
+    break;
+  case 'build': // alias for backcompat
+  case 'rebuild':
+    writeDockerfile(allProposals);
+    buildImages();
     break;
   case 'test':
     if (values.debug) {
diff --git a/packages/synthetic-chain/package.json b/packages/synthetic-chain/package.json
index 1354832a..550da6b5 100644
--- a/packages/synthetic-chain/package.json
+++ b/packages/synthetic-chain/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@agoric/synthetic-chain",
-  "version": "0.0.1-alpha",
+  "version": "0.0.1",
   "description": "Utilities to build a chain and test proposals atop it",
   "bin": "./cli.ts",
   "main": "index.js",
@@ -30,5 +30,8 @@
       "ts": "module"
     }
   },
-  "license": "Apache-2.0"
+  "license": "Apache-2.0",
+  "publishConfig": {
+    "access": "public"
+  }
 }
diff --git a/packages/synthetic-chain/src/cli/build.ts b/packages/synthetic-chain/src/cli/build.ts
index 49038830..5d049516 100755
--- a/packages/synthetic-chain/src/cli/build.ts
+++ b/packages/synthetic-chain/src/cli/build.ts
@@ -1,4 +1,5 @@
 import { execSync } from 'node:child_process';
+import fs from 'node:fs';
 import path from 'node:path';
 import { ProposalInfo, imageNameForProposal } from './proposals.js';
 
@@ -22,9 +23,18 @@ export const buildProposalSubmissions = (proposals: ProposalInfo[]) => {
       cwd: submissionPath,
       env: { ...process.env, HOME: '.' },
     });
-    // UNTIL https://github.com/Agoric/agoric-sdk/pull/8559 is merged
-    // Move bundles from submission subdir to submission path.
-    execSync(`mv ${submissionPath}/.agoric/cache/* ${submissionPath}`);
+    // find the one file ending in -plan.json
+    // TODO error if there is more than one
+    const planPath = execSync(
+      `find ${submissionPath} -maxdepth 1 -type f -name '*-plan.json'`,
+    )
+      .toString()
+      .trim();
+    const plan = JSON.parse(fs.readFileSync(planPath, 'utf-8'));
+    for (const { fileName } of plan.bundles) {
+      // Copy the bundle into the submission path.
+      execSync(`cp ${fileName} ${submissionPath}`);
+    }
   }
 };
 
diff --git a/packages/synthetic-chain/src/cli/dockerfileGen.ts b/packages/synthetic-chain/src/cli/dockerfileGen.ts
index 0b8938f8..1df03ee2 100755
--- a/packages/synthetic-chain/src/cli/dockerfileGen.ts
+++ b/packages/synthetic-chain/src/cli/dockerfileGen.ts
@@ -7,12 +7,6 @@ import type {
   ProposalInfo,
   SoftwareUpgradeProposal,
 } from './proposals.js';
-import { readProposals } from './proposals.js';
-
-const agZeroUpgrade = 'agoric-upgrade-7-2';
-
-// TODO change the tag to 'main' after multi-platform support https://github.com/Agoric/agoric-3-proposals/pull/32
-const baseImage = 'ghcr.io/agoric/agoric-3-proposals:pr-32-linux_arm64_v8';
 
 /**
  * Templates for Dockerfile stages
@@ -24,6 +18,7 @@ const stage = {
    * @param to
    */
   START(proposalName: string, to: string) {
+    const agZeroUpgrade = 'agoric-upgrade-7-2';
     return `
 ## START
 # on ${agZeroUpgrade}, with upgrade to ${to}
@@ -40,15 +35,16 @@ RUN /usr/src/upgrade-test-scripts/start_ag0.sh
 `;
   },
   /**
-   * Resume from latest production state
+   * Resume from state of an existing image
+   * @param fromTag
    * @param proposalName
    * @param to
    */
-  RESUME(proposalName: string, to: string) {
+  RESUME(fromTag: string, proposalName: string, to: string) {
     return `
 ## RESUME
 # on a3p base, with upgrade to ${to}
-FROM ${baseImage} as prepare-${proposalName}
+FROM ghcr.io/agoric/agoric-3-proposals:${fromTag} as prepare-${proposalName}
 `;
   },
 
@@ -209,7 +205,10 @@ ENTRYPOINT ./start_agd.sh
   },
 };
 
-export function refreshDockerfile(allProposals: ProposalInfo[]) {
+export function writeDockerfile(
+  allProposals: ProposalInfo[],
+  fromTag?: string,
+) {
   // Each stage tests something about the left argument and prepare an upgrade to the right side (by passing the proposal and halting the chain.)
   // The upgrade doesn't happen until the next stage begins executing.
   const blocks: string[] = [];
@@ -227,9 +226,11 @@ export function refreshDockerfile(allProposals: ProposalInfo[]) {
       // handle the first proposal specially
       if (previousProposal) {
         blocks.push(stage.PREPARE(proposal, previousProposal));
+      } else if (fromTag) {
+        blocks.push(
+          stage.RESUME(fromTag, proposal.proposalName, proposal.planName),
+        );
       } else {
-        // TODO for external use, provide a way to stack upgrades onto an existing chain
-        // blocks.push(stage.RESUME(proposal.proposalName, proposal.planName));
         blocks.push(stage.START(proposal.proposalName, proposal.planName));
       }
       blocks.push(stage.EXECUTE(proposal));
diff --git a/proposals/34:upgrade-10/agoric-synthetic-chain-0.0.1-alpha.tgz b/proposals/34:upgrade-10/agoric-synthetic-chain-0.0.1-alpha.tgz
deleted file mode 100644
index 0e985be6..00000000
Binary files a/proposals/34:upgrade-10/agoric-synthetic-chain-0.0.1-alpha.tgz and /dev/null differ
diff --git a/proposals/34:upgrade-10/package.json b/proposals/34:upgrade-10/package.json
index 2808a7be..505ed806 100644
--- a/proposals/34:upgrade-10/package.json
+++ b/proposals/34:upgrade-10/package.json
@@ -8,7 +8,7 @@
     "type": "module",
     "license": "Apache-2.0",
     "dependencies": {
-        "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz",
+        "@agoric/synthetic-chain": "^0.0.1-rc0",
         "ava": "^5.3.1",
         "better-sqlite3": "^8.5.1",
         "execa": "^7.2.0"
diff --git a/proposals/34:upgrade-10/yarn.lock b/proposals/34:upgrade-10/yarn.lock
index 7184a69f..d685e083 100644
--- a/proposals/34:upgrade-10/yarn.lock
+++ b/proposals/34:upgrade-10/yarn.lock
@@ -5,14 +5,15 @@ __metadata:
   version: 8
   cacheKey: 10c0
 
-"@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz::locator=root-workspace-0b6124%40workspace%3A.":
-  version: 0.0.1-alpha
-  resolution: "@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz#./agoric-synthetic-chain-0.0.1-alpha.tgz::hash=1144d8&locator=root-workspace-0b6124%40workspace%3A."
+"@agoric/synthetic-chain@npm:^0.0.1-rc0":
+  version: 0.0.1-rc0
+  resolution: "@agoric/synthetic-chain@npm:0.0.1-rc0"
   dependencies:
     tsx: "npm:^3.12.8"
+    typescript: "npm:^5.3.3"
   bin:
-    synthetic-chain: ./cli.ts
-  checksum: 012b67bb80fc818bdb63a16f05007c7183a63d45d0a99a2ce1477079fe2249eae0961c6325b30cea111f4dd38487011f20a94a1518a8b8badef7c4583992d131
+    synthetic-chain: cli.ts
+  checksum: b038f72b31d176f35e580ef18ba656f14e39494b165232f5b636bd8b493240c04007752f6d971f2ad3e7a5224f3951ff77f244c98f7ee9d406958fbf297a5f1e
   languageName: node
   linkType: hard
 
@@ -2064,7 +2065,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "root-workspace-0b6124@workspace:."
   dependencies:
-    "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz"
+    "@agoric/synthetic-chain": "npm:^0.0.1-rc0"
     ava: "npm:^5.3.1"
     better-sqlite3: "npm:^8.5.1"
     execa: "npm:^7.2.0"
@@ -2419,6 +2420,26 @@ __metadata:
   languageName: node
   linkType: hard
 
+"typescript@npm:^5.3.3":
+  version: 5.3.3
+  resolution: "typescript@npm:5.3.3"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: e33cef99d82573624fc0f854a2980322714986bc35b9cb4d1ce736ed182aeab78e2cb32b385efa493b2a976ef52c53e20d6c6918312353a91850e2b76f1ea44f
+  languageName: node
+  linkType: hard
+
+"typescript@patch:typescript@npm%3A^5.3.3#optional!builtin<compat/typescript>":
+  version: 5.3.3
+  resolution: "typescript@patch:typescript@npm%3A5.3.3#optional!builtin<compat/typescript>::version=5.3.3&hash=e012d7"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: 1d0a5f4ce496c42caa9a30e659c467c5686eae15d54b027ee7866744952547f1be1262f2d40de911618c242b510029d51d43ff605dba8fb740ec85ca2d3f9500
+  languageName: node
+  linkType: hard
+
 "unique-filename@npm:^3.0.0":
   version: 3.0.0
   resolution: "unique-filename@npm:3.0.0"
diff --git a/proposals/43:upgrade-11/agoric-synthetic-chain-0.0.1-alpha.tgz b/proposals/43:upgrade-11/agoric-synthetic-chain-0.0.1-alpha.tgz
deleted file mode 100644
index 0e985be6..00000000
Binary files a/proposals/43:upgrade-11/agoric-synthetic-chain-0.0.1-alpha.tgz and /dev/null differ
diff --git a/proposals/43:upgrade-11/package.json b/proposals/43:upgrade-11/package.json
index bb2e6cf5..b84c7144 100644
--- a/proposals/43:upgrade-11/package.json
+++ b/proposals/43:upgrade-11/package.json
@@ -8,7 +8,7 @@
     "type": "module",
     "license": "Apache-2.0",
     "dependencies": {
-        "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz",
+        "@agoric/synthetic-chain": "^0.0.1-rc0",
         "ava": "^5.3.1",
         "better-sqlite3": "^8.5.1",
         "execa": "^7.2.0"
diff --git a/proposals/43:upgrade-11/yarn.lock b/proposals/43:upgrade-11/yarn.lock
index 7184a69f..d685e083 100644
--- a/proposals/43:upgrade-11/yarn.lock
+++ b/proposals/43:upgrade-11/yarn.lock
@@ -5,14 +5,15 @@ __metadata:
   version: 8
   cacheKey: 10c0
 
-"@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz::locator=root-workspace-0b6124%40workspace%3A.":
-  version: 0.0.1-alpha
-  resolution: "@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz#./agoric-synthetic-chain-0.0.1-alpha.tgz::hash=1144d8&locator=root-workspace-0b6124%40workspace%3A."
+"@agoric/synthetic-chain@npm:^0.0.1-rc0":
+  version: 0.0.1-rc0
+  resolution: "@agoric/synthetic-chain@npm:0.0.1-rc0"
   dependencies:
     tsx: "npm:^3.12.8"
+    typescript: "npm:^5.3.3"
   bin:
-    synthetic-chain: ./cli.ts
-  checksum: 012b67bb80fc818bdb63a16f05007c7183a63d45d0a99a2ce1477079fe2249eae0961c6325b30cea111f4dd38487011f20a94a1518a8b8badef7c4583992d131
+    synthetic-chain: cli.ts
+  checksum: b038f72b31d176f35e580ef18ba656f14e39494b165232f5b636bd8b493240c04007752f6d971f2ad3e7a5224f3951ff77f244c98f7ee9d406958fbf297a5f1e
   languageName: node
   linkType: hard
 
@@ -2064,7 +2065,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "root-workspace-0b6124@workspace:."
   dependencies:
-    "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz"
+    "@agoric/synthetic-chain": "npm:^0.0.1-rc0"
     ava: "npm:^5.3.1"
     better-sqlite3: "npm:^8.5.1"
     execa: "npm:^7.2.0"
@@ -2419,6 +2420,26 @@ __metadata:
   languageName: node
   linkType: hard
 
+"typescript@npm:^5.3.3":
+  version: 5.3.3
+  resolution: "typescript@npm:5.3.3"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: e33cef99d82573624fc0f854a2980322714986bc35b9cb4d1ce736ed182aeab78e2cb32b385efa493b2a976ef52c53e20d6c6918312353a91850e2b76f1ea44f
+  languageName: node
+  linkType: hard
+
+"typescript@patch:typescript@npm%3A^5.3.3#optional!builtin<compat/typescript>":
+  version: 5.3.3
+  resolution: "typescript@patch:typescript@npm%3A5.3.3#optional!builtin<compat/typescript>::version=5.3.3&hash=e012d7"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: 1d0a5f4ce496c42caa9a30e659c467c5686eae15d54b027ee7866744952547f1be1262f2d40de911618c242b510029d51d43ff605dba8fb740ec85ca2d3f9500
+  languageName: node
+  linkType: hard
+
 "unique-filename@npm:^3.0.0":
   version: 3.0.0
   resolution: "unique-filename@npm:3.0.0"
diff --git a/proposals/49:smart-wallet-nft/agoric-synthetic-chain-0.0.1-alpha.tgz b/proposals/49:smart-wallet-nft/agoric-synthetic-chain-0.0.1-alpha.tgz
deleted file mode 100644
index 0e985be6..00000000
Binary files a/proposals/49:smart-wallet-nft/agoric-synthetic-chain-0.0.1-alpha.tgz and /dev/null differ
diff --git a/proposals/49:smart-wallet-nft/package.json b/proposals/49:smart-wallet-nft/package.json
index e761c608..e3dc1797 100644
--- a/proposals/49:smart-wallet-nft/package.json
+++ b/proposals/49:smart-wallet-nft/package.json
@@ -5,7 +5,7 @@
     "type": "module",
     "license": "Apache-2.0",
     "dependencies": {
-        "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz",
+        "@agoric/synthetic-chain": "^0.0.1-rc0",
         "@endo/zip": "^0.2.35",
         "ava": "^5.3.1",
         "better-sqlite3": "^8.5.1",
diff --git a/proposals/49:smart-wallet-nft/yarn.lock b/proposals/49:smart-wallet-nft/yarn.lock
index 422a4296..00809067 100644
--- a/proposals/49:smart-wallet-nft/yarn.lock
+++ b/proposals/49:smart-wallet-nft/yarn.lock
@@ -5,14 +5,15 @@ __metadata:
   version: 8
   cacheKey: 10c0
 
-"@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz::locator=root-workspace-0b6124%40workspace%3A.":
-  version: 0.0.1-alpha
-  resolution: "@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz#./agoric-synthetic-chain-0.0.1-alpha.tgz::hash=1144d8&locator=root-workspace-0b6124%40workspace%3A."
+"@agoric/synthetic-chain@npm:^0.0.1-rc0":
+  version: 0.0.1-rc0
+  resolution: "@agoric/synthetic-chain@npm:0.0.1-rc0"
   dependencies:
     tsx: "npm:^3.12.8"
+    typescript: "npm:^5.3.3"
   bin:
-    synthetic-chain: ./cli.ts
-  checksum: 012b67bb80fc818bdb63a16f05007c7183a63d45d0a99a2ce1477079fe2249eae0961c6325b30cea111f4dd38487011f20a94a1518a8b8badef7c4583992d131
+    synthetic-chain: cli.ts
+  checksum: b038f72b31d176f35e580ef18ba656f14e39494b165232f5b636bd8b493240c04007752f6d971f2ad3e7a5224f3951ff77f244c98f7ee9d406958fbf297a5f1e
   languageName: node
   linkType: hard
 
@@ -2146,7 +2147,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "root-workspace-0b6124@workspace:."
   dependencies:
-    "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz"
+    "@agoric/synthetic-chain": "npm:^0.0.1-rc0"
     "@endo/zip": "npm:^0.2.35"
     ava: "npm:^5.3.1"
     better-sqlite3: "npm:^8.5.1"
@@ -2512,6 +2513,26 @@ __metadata:
   languageName: node
   linkType: hard
 
+"typescript@npm:^5.3.3":
+  version: 5.3.3
+  resolution: "typescript@npm:5.3.3"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: e33cef99d82573624fc0f854a2980322714986bc35b9cb4d1ce736ed182aeab78e2cb32b385efa493b2a976ef52c53e20d6c6918312353a91850e2b76f1ea44f
+  languageName: node
+  linkType: hard
+
+"typescript@patch:typescript@npm%3A^5.3.3#optional!builtin<compat/typescript>":
+  version: 5.3.3
+  resolution: "typescript@patch:typescript@npm%3A5.3.3#optional!builtin<compat/typescript>::version=5.3.3&hash=e012d7"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: 1d0a5f4ce496c42caa9a30e659c467c5686eae15d54b027ee7866744952547f1be1262f2d40de911618c242b510029d51d43ff605dba8fb740ec85ca2d3f9500
+  languageName: node
+  linkType: hard
+
 "unique-filename@npm:^3.0.0":
   version: 3.0.0
   resolution: "unique-filename@npm:3.0.0"
diff --git a/proposals/53:kread-start/agoric-synthetic-chain-0.0.1-alpha.tgz b/proposals/53:kread-start/agoric-synthetic-chain-0.0.1-alpha.tgz
deleted file mode 100644
index 1da6309e..00000000
Binary files a/proposals/53:kread-start/agoric-synthetic-chain-0.0.1-alpha.tgz and /dev/null differ
diff --git a/proposals/53:kread-start/package.json b/proposals/53:kread-start/package.json
index dfd87bbd..2f0d6f5e 100644
--- a/proposals/53:kread-start/package.json
+++ b/proposals/53:kread-start/package.json
@@ -5,7 +5,7 @@
   "type": "module",
   "license": "Apache-2.0",
   "dependencies": {
-    "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz",
+    "@agoric/synthetic-chain": "^0.0.1-rc0",
     "@endo/zip": "^0.2.35",
     "ava": "^5.3.1",
     "better-sqlite3": "^8.5.1",
diff --git a/proposals/53:kread-start/yarn.lock b/proposals/53:kread-start/yarn.lock
index 6a9e61c3..00809067 100644
--- a/proposals/53:kread-start/yarn.lock
+++ b/proposals/53:kread-start/yarn.lock
@@ -5,14 +5,15 @@ __metadata:
   version: 8
   cacheKey: 10c0
 
-"@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz::locator=root-workspace-0b6124%40workspace%3A.":
-  version: 0.0.1-alpha
-  resolution: "@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz#./agoric-synthetic-chain-0.0.1-alpha.tgz::hash=f042ca&locator=root-workspace-0b6124%40workspace%3A."
+"@agoric/synthetic-chain@npm:^0.0.1-rc0":
+  version: 0.0.1-rc0
+  resolution: "@agoric/synthetic-chain@npm:0.0.1-rc0"
   dependencies:
     tsx: "npm:^3.12.8"
+    typescript: "npm:^5.3.3"
   bin:
-    synthetic-chain: ./cli.ts
-  checksum: f80028205d24465ff5d7b6cf47e7bb7c1d7f255a98a868a6b2d110be99744fca77b6ee7963b971200b0b6e4f021030ee1ab1207f70d76eb4a40d7c1ceee3d6ea
+    synthetic-chain: cli.ts
+  checksum: b038f72b31d176f35e580ef18ba656f14e39494b165232f5b636bd8b493240c04007752f6d971f2ad3e7a5224f3951ff77f244c98f7ee9d406958fbf297a5f1e
   languageName: node
   linkType: hard
 
@@ -2146,7 +2147,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "root-workspace-0b6124@workspace:."
   dependencies:
-    "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz"
+    "@agoric/synthetic-chain": "npm:^0.0.1-rc0"
     "@endo/zip": "npm:^0.2.35"
     ava: "npm:^5.3.1"
     better-sqlite3: "npm:^8.5.1"
@@ -2512,6 +2513,26 @@ __metadata:
   languageName: node
   linkType: hard
 
+"typescript@npm:^5.3.3":
+  version: 5.3.3
+  resolution: "typescript@npm:5.3.3"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: e33cef99d82573624fc0f854a2980322714986bc35b9cb4d1ce736ed182aeab78e2cb32b385efa493b2a976ef52c53e20d6c6918312353a91850e2b76f1ea44f
+  languageName: node
+  linkType: hard
+
+"typescript@patch:typescript@npm%3A^5.3.3#optional!builtin<compat/typescript>":
+  version: 5.3.3
+  resolution: "typescript@patch:typescript@npm%3A5.3.3#optional!builtin<compat/typescript>::version=5.3.3&hash=e012d7"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: 1d0a5f4ce496c42caa9a30e659c467c5686eae15d54b027ee7866744952547f1be1262f2d40de911618c242b510029d51d43ff605dba8fb740ec85ca2d3f9500
+  languageName: node
+  linkType: hard
+
 "unique-filename@npm:^3.0.0":
   version: 3.0.0
   resolution: "unique-filename@npm:3.0.0"
diff --git a/proposals/55:statom-vaults/agoric-synthetic-chain-0.0.1-alpha.tgz b/proposals/55:statom-vaults/agoric-synthetic-chain-0.0.1-alpha.tgz
deleted file mode 100644
index 0e985be6..00000000
Binary files a/proposals/55:statom-vaults/agoric-synthetic-chain-0.0.1-alpha.tgz and /dev/null differ
diff --git a/proposals/55:statom-vaults/package.json b/proposals/55:statom-vaults/package.json
index e761c608..e3dc1797 100644
--- a/proposals/55:statom-vaults/package.json
+++ b/proposals/55:statom-vaults/package.json
@@ -5,7 +5,7 @@
     "type": "module",
     "license": "Apache-2.0",
     "dependencies": {
-        "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz",
+        "@agoric/synthetic-chain": "^0.0.1-rc0",
         "@endo/zip": "^0.2.35",
         "ava": "^5.3.1",
         "better-sqlite3": "^8.5.1",
diff --git a/proposals/55:statom-vaults/yarn.lock b/proposals/55:statom-vaults/yarn.lock
index 422a4296..00809067 100644
--- a/proposals/55:statom-vaults/yarn.lock
+++ b/proposals/55:statom-vaults/yarn.lock
@@ -5,14 +5,15 @@ __metadata:
   version: 8
   cacheKey: 10c0
 
-"@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz::locator=root-workspace-0b6124%40workspace%3A.":
-  version: 0.0.1-alpha
-  resolution: "@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz#./agoric-synthetic-chain-0.0.1-alpha.tgz::hash=1144d8&locator=root-workspace-0b6124%40workspace%3A."
+"@agoric/synthetic-chain@npm:^0.0.1-rc0":
+  version: 0.0.1-rc0
+  resolution: "@agoric/synthetic-chain@npm:0.0.1-rc0"
   dependencies:
     tsx: "npm:^3.12.8"
+    typescript: "npm:^5.3.3"
   bin:
-    synthetic-chain: ./cli.ts
-  checksum: 012b67bb80fc818bdb63a16f05007c7183a63d45d0a99a2ce1477079fe2249eae0961c6325b30cea111f4dd38487011f20a94a1518a8b8badef7c4583992d131
+    synthetic-chain: cli.ts
+  checksum: b038f72b31d176f35e580ef18ba656f14e39494b165232f5b636bd8b493240c04007752f6d971f2ad3e7a5224f3951ff77f244c98f7ee9d406958fbf297a5f1e
   languageName: node
   linkType: hard
 
@@ -2146,7 +2147,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "root-workspace-0b6124@workspace:."
   dependencies:
-    "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz"
+    "@agoric/synthetic-chain": "npm:^0.0.1-rc0"
     "@endo/zip": "npm:^0.2.35"
     ava: "npm:^5.3.1"
     better-sqlite3: "npm:^8.5.1"
@@ -2512,6 +2513,26 @@ __metadata:
   languageName: node
   linkType: hard
 
+"typescript@npm:^5.3.3":
+  version: 5.3.3
+  resolution: "typescript@npm:5.3.3"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: e33cef99d82573624fc0f854a2980322714986bc35b9cb4d1ce736ed182aeab78e2cb32b385efa493b2a976ef52c53e20d6c6918312353a91850e2b76f1ea44f
+  languageName: node
+  linkType: hard
+
+"typescript@patch:typescript@npm%3A^5.3.3#optional!builtin<compat/typescript>":
+  version: 5.3.3
+  resolution: "typescript@patch:typescript@npm%3A5.3.3#optional!builtin<compat/typescript>::version=5.3.3&hash=e012d7"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: 1d0a5f4ce496c42caa9a30e659c467c5686eae15d54b027ee7866744952547f1be1262f2d40de911618c242b510029d51d43ff605dba8fb740ec85ca2d3f9500
+  languageName: node
+  linkType: hard
+
 "unique-filename@npm:^3.0.0":
   version: 3.0.0
   resolution: "unique-filename@npm:3.0.0"
diff --git a/proposals/63:upgrade-12/agoric-synthetic-chain-0.0.1-alpha.tgz b/proposals/63:upgrade-12/agoric-synthetic-chain-0.0.1-alpha.tgz
deleted file mode 100644
index 0e985be6..00000000
Binary files a/proposals/63:upgrade-12/agoric-synthetic-chain-0.0.1-alpha.tgz and /dev/null differ
diff --git a/proposals/63:upgrade-12/package.json b/proposals/63:upgrade-12/package.json
index 68eaf80d..1dcff079 100644
--- a/proposals/63:upgrade-12/package.json
+++ b/proposals/63:upgrade-12/package.json
@@ -8,7 +8,7 @@
     "type": "module",
     "license": "Apache-2.0",
     "dependencies": {
-        "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz",
+        "@agoric/synthetic-chain": "^0.0.1-rc0",
         "ava": "^5.3.1",
         "execa": "^7.2.0"
     },
diff --git a/proposals/63:upgrade-12/yarn.lock b/proposals/63:upgrade-12/yarn.lock
index c45a0b06..4e970381 100644
--- a/proposals/63:upgrade-12/yarn.lock
+++ b/proposals/63:upgrade-12/yarn.lock
@@ -5,14 +5,15 @@ __metadata:
   version: 8
   cacheKey: 10c0
 
-"@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz::locator=root-workspace-0b6124%40workspace%3A.":
-  version: 0.0.1-alpha
-  resolution: "@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz#./agoric-synthetic-chain-0.0.1-alpha.tgz::hash=1144d8&locator=root-workspace-0b6124%40workspace%3A."
+"@agoric/synthetic-chain@npm:^0.0.1-rc0":
+  version: 0.0.1-rc0
+  resolution: "@agoric/synthetic-chain@npm:0.0.1-rc0"
   dependencies:
     tsx: "npm:^3.12.8"
+    typescript: "npm:^5.3.3"
   bin:
-    synthetic-chain: ./cli.ts
-  checksum: 012b67bb80fc818bdb63a16f05007c7183a63d45d0a99a2ce1477079fe2249eae0961c6325b30cea111f4dd38487011f20a94a1518a8b8badef7c4583992d131
+    synthetic-chain: cli.ts
+  checksum: b038f72b31d176f35e580ef18ba656f14e39494b165232f5b636bd8b493240c04007752f6d971f2ad3e7a5224f3951ff77f244c98f7ee9d406958fbf297a5f1e
   languageName: node
   linkType: hard
 
@@ -1825,7 +1826,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "root-workspace-0b6124@workspace:."
   dependencies:
-    "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz"
+    "@agoric/synthetic-chain": "npm:^0.0.1-rc0"
     ava: "npm:^5.3.1"
     execa: "npm:^7.2.0"
   languageName: unknown
@@ -2104,6 +2105,26 @@ __metadata:
   languageName: node
   linkType: hard
 
+"typescript@npm:^5.3.3":
+  version: 5.3.3
+  resolution: "typescript@npm:5.3.3"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: e33cef99d82573624fc0f854a2980322714986bc35b9cb4d1ce736ed182aeab78e2cb32b385efa493b2a976ef52c53e20d6c6918312353a91850e2b76f1ea44f
+  languageName: node
+  linkType: hard
+
+"typescript@patch:typescript@npm%3A^5.3.3#optional!builtin<compat/typescript>":
+  version: 5.3.3
+  resolution: "typescript@patch:typescript@npm%3A5.3.3#optional!builtin<compat/typescript>::version=5.3.3&hash=e012d7"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: 1d0a5f4ce496c42caa9a30e659c467c5686eae15d54b027ee7866744952547f1be1262f2d40de911618c242b510029d51d43ff605dba8fb740ec85ca2d3f9500
+  languageName: node
+  linkType: hard
+
 "unique-filename@npm:^3.0.0":
   version: 3.0.0
   resolution: "unique-filename@npm:3.0.0"
diff --git a/proposals/65:upgrade-13/package.json b/proposals/65:upgrade-13/package.json
index 451f6bbb..535bf47f 100644
--- a/proposals/65:upgrade-13/package.json
+++ b/proposals/65:upgrade-13/package.json
@@ -8,6 +8,7 @@
   "type": "module",
   "license": "Apache-2.0",
   "dependencies": {
+    "@agoric/synthetic-chain": "^0.0.1-rc0",
     "ava": "^5.3.1",
     "execa": "^7.2.0"
   },
diff --git a/proposals/65:upgrade-13/yarn.lock b/proposals/65:upgrade-13/yarn.lock
index 7dd389c9..4e970381 100644
--- a/proposals/65:upgrade-13/yarn.lock
+++ b/proposals/65:upgrade-13/yarn.lock
@@ -5,6 +5,172 @@ __metadata:
   version: 8
   cacheKey: 10c0
 
+"@agoric/synthetic-chain@npm:^0.0.1-rc0":
+  version: 0.0.1-rc0
+  resolution: "@agoric/synthetic-chain@npm:0.0.1-rc0"
+  dependencies:
+    tsx: "npm:^3.12.8"
+    typescript: "npm:^5.3.3"
+  bin:
+    synthetic-chain: cli.ts
+  checksum: b038f72b31d176f35e580ef18ba656f14e39494b165232f5b636bd8b493240c04007752f6d971f2ad3e7a5224f3951ff77f244c98f7ee9d406958fbf297a5f1e
+  languageName: node
+  linkType: hard
+
+"@esbuild/android-arm64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/android-arm64@npm:0.18.20"
+  conditions: os=android & cpu=arm64
+  languageName: node
+  linkType: hard
+
+"@esbuild/android-arm@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/android-arm@npm:0.18.20"
+  conditions: os=android & cpu=arm
+  languageName: node
+  linkType: hard
+
+"@esbuild/android-x64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/android-x64@npm:0.18.20"
+  conditions: os=android & cpu=x64
+  languageName: node
+  linkType: hard
+
+"@esbuild/darwin-arm64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/darwin-arm64@npm:0.18.20"
+  conditions: os=darwin & cpu=arm64
+  languageName: node
+  linkType: hard
+
+"@esbuild/darwin-x64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/darwin-x64@npm:0.18.20"
+  conditions: os=darwin & cpu=x64
+  languageName: node
+  linkType: hard
+
+"@esbuild/freebsd-arm64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/freebsd-arm64@npm:0.18.20"
+  conditions: os=freebsd & cpu=arm64
+  languageName: node
+  linkType: hard
+
+"@esbuild/freebsd-x64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/freebsd-x64@npm:0.18.20"
+  conditions: os=freebsd & cpu=x64
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-arm64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/linux-arm64@npm:0.18.20"
+  conditions: os=linux & cpu=arm64
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-arm@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/linux-arm@npm:0.18.20"
+  conditions: os=linux & cpu=arm
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-ia32@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/linux-ia32@npm:0.18.20"
+  conditions: os=linux & cpu=ia32
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-loong64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/linux-loong64@npm:0.18.20"
+  conditions: os=linux & cpu=loong64
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-mips64el@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/linux-mips64el@npm:0.18.20"
+  conditions: os=linux & cpu=mips64el
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-ppc64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/linux-ppc64@npm:0.18.20"
+  conditions: os=linux & cpu=ppc64
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-riscv64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/linux-riscv64@npm:0.18.20"
+  conditions: os=linux & cpu=riscv64
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-s390x@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/linux-s390x@npm:0.18.20"
+  conditions: os=linux & cpu=s390x
+  languageName: node
+  linkType: hard
+
+"@esbuild/linux-x64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/linux-x64@npm:0.18.20"
+  conditions: os=linux & cpu=x64
+  languageName: node
+  linkType: hard
+
+"@esbuild/netbsd-x64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/netbsd-x64@npm:0.18.20"
+  conditions: os=netbsd & cpu=x64
+  languageName: node
+  linkType: hard
+
+"@esbuild/openbsd-x64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/openbsd-x64@npm:0.18.20"
+  conditions: os=openbsd & cpu=x64
+  languageName: node
+  linkType: hard
+
+"@esbuild/sunos-x64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/sunos-x64@npm:0.18.20"
+  conditions: os=sunos & cpu=x64
+  languageName: node
+  linkType: hard
+
+"@esbuild/win32-arm64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/win32-arm64@npm:0.18.20"
+  conditions: os=win32 & cpu=arm64
+  languageName: node
+  linkType: hard
+
+"@esbuild/win32-ia32@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/win32-ia32@npm:0.18.20"
+  conditions: os=win32 & cpu=ia32
+  languageName: node
+  linkType: hard
+
+"@esbuild/win32-x64@npm:0.18.20":
+  version: 0.18.20
+  resolution: "@esbuild/win32-x64@npm:0.18.20"
+  conditions: os=win32 & cpu=x64
+  languageName: node
+  linkType: hard
+
 "@isaacs/cliui@npm:^8.0.2":
   version: 8.0.2
   resolution: "@isaacs/cliui@npm:8.0.2"
@@ -294,6 +460,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"buffer-from@npm:^1.0.0":
+  version: 1.1.2
+  resolution: "buffer-from@npm:1.1.2"
+  checksum: 124fff9d66d691a86d3b062eff4663fe437a9d9ee4b47b1b9e97f5a5d14f6d5399345db80f796827be7c95e70a8e765dd404b7c3ff3b3324f98e9b0c8826cc34
+  languageName: node
+  linkType: hard
+
 "cacache@npm:^18.0.0":
   version: 18.0.1
   resolution: "cacache@npm:18.0.1"
@@ -584,6 +757,83 @@ __metadata:
   languageName: node
   linkType: hard
 
+"esbuild@npm:~0.18.20":
+  version: 0.18.20
+  resolution: "esbuild@npm:0.18.20"
+  dependencies:
+    "@esbuild/android-arm": "npm:0.18.20"
+    "@esbuild/android-arm64": "npm:0.18.20"
+    "@esbuild/android-x64": "npm:0.18.20"
+    "@esbuild/darwin-arm64": "npm:0.18.20"
+    "@esbuild/darwin-x64": "npm:0.18.20"
+    "@esbuild/freebsd-arm64": "npm:0.18.20"
+    "@esbuild/freebsd-x64": "npm:0.18.20"
+    "@esbuild/linux-arm": "npm:0.18.20"
+    "@esbuild/linux-arm64": "npm:0.18.20"
+    "@esbuild/linux-ia32": "npm:0.18.20"
+    "@esbuild/linux-loong64": "npm:0.18.20"
+    "@esbuild/linux-mips64el": "npm:0.18.20"
+    "@esbuild/linux-ppc64": "npm:0.18.20"
+    "@esbuild/linux-riscv64": "npm:0.18.20"
+    "@esbuild/linux-s390x": "npm:0.18.20"
+    "@esbuild/linux-x64": "npm:0.18.20"
+    "@esbuild/netbsd-x64": "npm:0.18.20"
+    "@esbuild/openbsd-x64": "npm:0.18.20"
+    "@esbuild/sunos-x64": "npm:0.18.20"
+    "@esbuild/win32-arm64": "npm:0.18.20"
+    "@esbuild/win32-ia32": "npm:0.18.20"
+    "@esbuild/win32-x64": "npm:0.18.20"
+  dependenciesMeta:
+    "@esbuild/android-arm":
+      optional: true
+    "@esbuild/android-arm64":
+      optional: true
+    "@esbuild/android-x64":
+      optional: true
+    "@esbuild/darwin-arm64":
+      optional: true
+    "@esbuild/darwin-x64":
+      optional: true
+    "@esbuild/freebsd-arm64":
+      optional: true
+    "@esbuild/freebsd-x64":
+      optional: true
+    "@esbuild/linux-arm":
+      optional: true
+    "@esbuild/linux-arm64":
+      optional: true
+    "@esbuild/linux-ia32":
+      optional: true
+    "@esbuild/linux-loong64":
+      optional: true
+    "@esbuild/linux-mips64el":
+      optional: true
+    "@esbuild/linux-ppc64":
+      optional: true
+    "@esbuild/linux-riscv64":
+      optional: true
+    "@esbuild/linux-s390x":
+      optional: true
+    "@esbuild/linux-x64":
+      optional: true
+    "@esbuild/netbsd-x64":
+      optional: true
+    "@esbuild/openbsd-x64":
+      optional: true
+    "@esbuild/sunos-x64":
+      optional: true
+    "@esbuild/win32-arm64":
+      optional: true
+    "@esbuild/win32-ia32":
+      optional: true
+    "@esbuild/win32-x64":
+      optional: true
+  bin:
+    esbuild: bin/esbuild
+  checksum: 473b1d92842f50a303cf948a11ebd5f69581cd254d599dd9d62f9989858e0533f64e83b723b5e1398a5b488c0f5fd088795b4235f65ecaf4f007d4b79f04bc88
+  languageName: node
+  linkType: hard
+
 "escalade@npm:^3.1.1":
   version: 3.1.1
   resolution: "escalade@npm:3.1.1"
@@ -732,7 +982,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"fsevents@npm:~2.3.2":
+"fsevents@npm:~2.3.2, fsevents@npm:~2.3.3":
   version: 2.3.3
   resolution: "fsevents@npm:2.3.3"
   dependencies:
@@ -742,7 +992,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"fsevents@patch:fsevents@npm%3A~2.3.2#optional!builtin<compat/fsevents>":
+"fsevents@patch:fsevents@npm%3A~2.3.2#optional!builtin<compat/fsevents>, fsevents@patch:fsevents@npm%3A~2.3.3#optional!builtin<compat/fsevents>":
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   resolution: "fsevents@patch:fsevents@npm%3A2.3.3#optional!builtin<compat/fsevents>::version=2.3.3&hash=df0bf1"
   dependencies:
@@ -765,6 +1015,15 @@ __metadata:
   languageName: node
   linkType: hard
 
+"get-tsconfig@npm:^4.7.2":
+  version: 4.7.2
+  resolution: "get-tsconfig@npm:4.7.2"
+  dependencies:
+    resolve-pkg-maps: "npm:^1.0.0"
+  checksum: 169b2beababfbb16e8a0ae813ee59d3e14d4960231c816615161ab5be68ec07a394dce59695742ac84295e2efab8d9e89bcf3abaf5e253dfbec3496e01bb9a65
+  languageName: node
+  linkType: hard
+
 "glob-parent@npm:^5.1.2, glob-parent@npm:~5.1.2":
   version: 5.1.2
   resolution: "glob-parent@npm:5.1.2"
@@ -1542,6 +1801,13 @@ __metadata:
   languageName: node
   linkType: hard
 
+"resolve-pkg-maps@npm:^1.0.0":
+  version: 1.0.0
+  resolution: "resolve-pkg-maps@npm:1.0.0"
+  checksum: fb8f7bbe2ca281a73b7ef423a1cbc786fb244bd7a95cbe5c3fba25b27d327150beca8ba02f622baea65919a57e061eb5005204daa5f93ed590d9b77463a567ab
+  languageName: node
+  linkType: hard
+
 "retry@npm:^0.12.0":
   version: 0.12.0
   resolution: "retry@npm:0.12.0"
@@ -1560,6 +1826,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "root-workspace-0b6124@workspace:."
   dependencies:
+    "@agoric/synthetic-chain": "npm:^0.0.1-rc0"
     ava: "npm:^5.3.1"
     execa: "npm:^7.2.0"
   languageName: unknown
@@ -1676,6 +1943,23 @@ __metadata:
   languageName: node
   linkType: hard
 
+"source-map-support@npm:^0.5.21":
+  version: 0.5.21
+  resolution: "source-map-support@npm:0.5.21"
+  dependencies:
+    buffer-from: "npm:^1.0.0"
+    source-map: "npm:^0.6.0"
+  checksum: 9ee09942f415e0f721d6daad3917ec1516af746a8120bba7bb56278707a37f1eb8642bde456e98454b8a885023af81a16e646869975f06afc1a711fb90484e7d
+  languageName: node
+  linkType: hard
+
+"source-map@npm:^0.6.0":
+  version: 0.6.1
+  resolution: "source-map@npm:0.6.1"
+  checksum: ab55398007c5e5532957cb0beee2368529618ac0ab372d789806f5718123cc4367d57de3904b4e6a4170eb5a0b0f41373066d02ca0735a0c4d75c7d328d3e011
+  languageName: node
+  linkType: hard
+
 "sprintf-js@npm:~1.0.2":
   version: 1.0.3
   resolution: "sprintf-js@npm:1.0.3"
@@ -1797,6 +2081,23 @@ __metadata:
   languageName: node
   linkType: hard
 
+"tsx@npm:^3.12.8":
+  version: 3.14.0
+  resolution: "tsx@npm:3.14.0"
+  dependencies:
+    esbuild: "npm:~0.18.20"
+    fsevents: "npm:~2.3.3"
+    get-tsconfig: "npm:^4.7.2"
+    source-map-support: "npm:^0.5.21"
+  dependenciesMeta:
+    fsevents:
+      optional: true
+  bin:
+    tsx: dist/cli.mjs
+  checksum: b6c938bdae9c656aef2aa0130ee6aa8f3487b5d411d5f7934b705c28ff44ab268db3dde123cf5237b4e5e2ab4441a0bad4b1a39e3ff2170d138538e44082f05d
+  languageName: node
+  linkType: hard
+
 "type-fest@npm:^0.13.1":
   version: 0.13.1
   resolution: "type-fest@npm:0.13.1"
@@ -1804,6 +2105,26 @@ __metadata:
   languageName: node
   linkType: hard
 
+"typescript@npm:^5.3.3":
+  version: 5.3.3
+  resolution: "typescript@npm:5.3.3"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: e33cef99d82573624fc0f854a2980322714986bc35b9cb4d1ce736ed182aeab78e2cb32b385efa493b2a976ef52c53e20d6c6918312353a91850e2b76f1ea44f
+  languageName: node
+  linkType: hard
+
+"typescript@patch:typescript@npm%3A^5.3.3#optional!builtin<compat/typescript>":
+  version: 5.3.3
+  resolution: "typescript@patch:typescript@npm%3A5.3.3#optional!builtin<compat/typescript>::version=5.3.3&hash=e012d7"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: 1d0a5f4ce496c42caa9a30e659c467c5686eae15d54b027ee7866744952547f1be1262f2d40de911618c242b510029d51d43ff605dba8fb740ec85ca2d3f9500
+  languageName: node
+  linkType: hard
+
 "unique-filename@npm:^3.0.0":
   version: 3.0.0
   resolution: "unique-filename@npm:3.0.0"
diff --git a/proposals/b:zoe1/agoric-synthetic-chain-0.0.1-alpha.tgz b/proposals/b:zoe1/agoric-synthetic-chain-0.0.1-alpha.tgz
deleted file mode 100644
index 0e985be6..00000000
Binary files a/proposals/b:zoe1/agoric-synthetic-chain-0.0.1-alpha.tgz and /dev/null differ
diff --git a/proposals/b:zoe1/package.json b/proposals/b:zoe1/package.json
index 12a6fda8..da6d7299 100644
--- a/proposals/b:zoe1/package.json
+++ b/proposals/b:zoe1/package.json
@@ -5,7 +5,7 @@
     "type": "module",
     "license": "Apache-2.0",
     "dependencies": {
-        "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz",
+        "@agoric/synthetic-chain": "^0.0.1-rc0",
         "@endo/zip": "^0.2.35",
         "ava": "^5.3.1",
         "better-sqlite3": "^8.5.1",
diff --git a/proposals/b:zoe1/yarn.lock b/proposals/b:zoe1/yarn.lock
index 422a4296..00809067 100644
--- a/proposals/b:zoe1/yarn.lock
+++ b/proposals/b:zoe1/yarn.lock
@@ -5,14 +5,15 @@ __metadata:
   version: 8
   cacheKey: 10c0
 
-"@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz::locator=root-workspace-0b6124%40workspace%3A.":
-  version: 0.0.1-alpha
-  resolution: "@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz#./agoric-synthetic-chain-0.0.1-alpha.tgz::hash=1144d8&locator=root-workspace-0b6124%40workspace%3A."
+"@agoric/synthetic-chain@npm:^0.0.1-rc0":
+  version: 0.0.1-rc0
+  resolution: "@agoric/synthetic-chain@npm:0.0.1-rc0"
   dependencies:
     tsx: "npm:^3.12.8"
+    typescript: "npm:^5.3.3"
   bin:
-    synthetic-chain: ./cli.ts
-  checksum: 012b67bb80fc818bdb63a16f05007c7183a63d45d0a99a2ce1477079fe2249eae0961c6325b30cea111f4dd38487011f20a94a1518a8b8badef7c4583992d131
+    synthetic-chain: cli.ts
+  checksum: b038f72b31d176f35e580ef18ba656f14e39494b165232f5b636bd8b493240c04007752f6d971f2ad3e7a5224f3951ff77f244c98f7ee9d406958fbf297a5f1e
   languageName: node
   linkType: hard
 
@@ -2146,7 +2147,7 @@ __metadata:
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   resolution: "root-workspace-0b6124@workspace:."
   dependencies:
-    "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz"
+    "@agoric/synthetic-chain": "npm:^0.0.1-rc0"
     "@endo/zip": "npm:^0.2.35"
     ava: "npm:^5.3.1"
     better-sqlite3: "npm:^8.5.1"
@@ -2512,6 +2513,26 @@ __metadata:
   languageName: node
   linkType: hard
 
+"typescript@npm:^5.3.3":
+  version: 5.3.3
+  resolution: "typescript@npm:5.3.3"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: e33cef99d82573624fc0f854a2980322714986bc35b9cb4d1ce736ed182aeab78e2cb32b385efa493b2a976ef52c53e20d6c6918312353a91850e2b76f1ea44f
+  languageName: node
+  linkType: hard
+
+"typescript@patch:typescript@npm%3A^5.3.3#optional!builtin<compat/typescript>":
+  version: 5.3.3
+  resolution: "typescript@patch:typescript@npm%3A5.3.3#optional!builtin<compat/typescript>::version=5.3.3&hash=e012d7"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: 1d0a5f4ce496c42caa9a30e659c467c5686eae15d54b027ee7866744952547f1be1262f2d40de911618c242b510029d51d43ff605dba8fb740ec85ca2d3f9500
+  languageName: node
+  linkType: hard
+
 "unique-filename@npm:^3.0.0":
   version: 3.0.0
   resolution: "unique-filename@npm:3.0.0"
diff --git a/proposals/c:crabble-start/agoric-synthetic-chain-0.0.1-alpha.tgz b/proposals/c:crabble-start/agoric-synthetic-chain-0.0.1-alpha.tgz
deleted file mode 100644
index 0e985be6..00000000
Binary files a/proposals/c:crabble-start/agoric-synthetic-chain-0.0.1-alpha.tgz and /dev/null differ
diff --git a/proposals/c:crabble-start/package.json b/proposals/c:crabble-start/package.json
index dfd87bbd..2f0d6f5e 100644
--- a/proposals/c:crabble-start/package.json
+++ b/proposals/c:crabble-start/package.json
@@ -5,7 +5,7 @@
   "type": "module",
   "license": "Apache-2.0",
   "dependencies": {
-    "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz",
+    "@agoric/synthetic-chain": "^0.0.1-rc0",
     "@endo/zip": "^0.2.35",
     "ava": "^5.3.1",
     "better-sqlite3": "^8.5.1",
diff --git a/proposals/c:crabble-start/yarn.lock b/proposals/c:crabble-start/yarn.lock
index d8c2020e..baef88fc 100644
--- a/proposals/c:crabble-start/yarn.lock
+++ b/proposals/c:crabble-start/yarn.lock
@@ -5,14 +5,15 @@ __metadata:
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   cacheKey: 10c0
 
-"@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz::locator=root-workspace-0b6124%40workspace%3A.":
-  version: 0.0.1-alpha
-  resolution: "@agoric/synthetic-chain@file:./agoric-synthetic-chain-0.0.1-alpha.tgz#./agoric-synthetic-chain-0.0.1-alpha.tgz::hash=1144d8&locator=root-workspace-0b6124%40workspace%3A."
+"@agoric/synthetic-chain@npm:^0.0.1-rc0":
+  version: 0.0.1-rc0
+  resolution: "@agoric/synthetic-chain@npm:0.0.1-rc0"
   dependencies:
     tsx: "npm:^3.12.8"
+    typescript: "npm:^5.3.3"
   bin:
-    synthetic-chain: ./cli.ts
-  checksum: 012b67bb80fc818bdb63a16f05007c7183a63d45d0a99a2ce1477079fe2249eae0961c6325b30cea111f4dd38487011f20a94a1518a8b8badef7c4583992d131
+    synthetic-chain: cli.ts
+  checksum: b038f72b31d176f35e580ef18ba656f14e39494b165232f5b636bd8b493240c04007752f6d971f2ad3e7a5224f3951ff77f244c98f7ee9d406958fbf297a5f1e
   languageName: node
   linkType: hard
 
@@ -2146,7 +2147,7 @@ __metadata:
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   resolution: "root-workspace-0b6124@workspace:."
   dependencies:
-    "@agoric/synthetic-chain": "file:./agoric-synthetic-chain-0.0.1-alpha.tgz"
+    "@agoric/synthetic-chain": "npm:^0.0.1-rc0"
     "@endo/zip": "npm:^0.2.35"
     ava: "npm:^5.3.1"
     better-sqlite3: "npm:^8.5.1"
@@ -2512,6 +2513,26 @@ __metadata:
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   linkType: hard
 
+"typescript@npm:^5.3.3":
+  version: 5.3.3
+  resolution: "typescript@npm:5.3.3"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
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+  languageName: node
+  linkType: hard
+
+"typescript@patch:typescript@npm%3A^5.3.3#optional!builtin<compat/typescript>":
+  version: 5.3.3
+  resolution: "typescript@patch:typescript@npm%3A5.3.3#optional!builtin<compat/typescript>::version=5.3.3&hash=e012d7"
+  bin:
+    tsc: bin/tsc
+    tsserver: bin/tsserver
+  checksum: 1d0a5f4ce496c42caa9a30e659c467c5686eae15d54b027ee7866744952547f1be1262f2d40de911618c242b510029d51d43ff605dba8fb740ec85ca2d3f9500
+  languageName: node
+  linkType: hard
+
 "unique-filename@npm:^3.0.0":
   version: 3.0.0
   resolution: "unique-filename@npm:3.0.0"