diff --git a/packages/boot/test/bootstrapTests/orchestration.test.ts b/packages/boot/test/bootstrapTests/orchestration.test.ts
index 1e22fe8dea8..5deaca784a1 100644
--- a/packages/boot/test/bootstrapTests/orchestration.test.ts
+++ b/packages/boot/test/bootstrapTests/orchestration.test.ts
@@ -2,12 +2,12 @@ import { test as anyTest } from '@agoric/zoe/tools/prepare-test-env-ava.js';
 
 import { Fail } from '@agoric/assert';
 import { AmountMath } from '@agoric/ertp';
+import { documentStorageSchema } from '@agoric/internal/src/storage-test-utils.js';
 import type { CosmosValidatorAddress } from '@agoric/orchestration';
 import type { start as startStakeIca } from '@agoric/orchestration/src/examples/stakeIca.contract.js';
 import type { Instance } from '@agoric/zoe/src/zoeService/utils.js';
 import { M, matches } from '@endo/patterns';
 import type { TestFn } from 'ava';
-import { documentStorageSchema } from '@agoric/internal/src/storage-test-utils.js';
 import {
   makeWalletFactoryContext,
   type WalletFactoryTestContext,
@@ -231,3 +231,35 @@ test.serial('stakeAtom - smart wallet', async t => {
     'delegate fails with invalid validator',
   );
 });
+
+// XXX rely on .serial to be in sequence, and keep this one last
+test.serial('revise chain info', async t => {
+  const {
+    buildProposal,
+    evalProposal,
+    runUtils: { EV },
+  } = t.context;
+
+  const agoricNames = await EV.vat('bootstrap').consumeItem('agoricNames');
+
+  await t.throwsAsync(EV(agoricNames).lookup('chain', 'hot'), {
+    message: '"nameKey" not found: "hot"',
+  });
+
+  // Revise chain info in agoricNames with the fixture in this script
+  await evalProposal(
+    buildProposal('@agoric/builders/scripts/testing/append-chain-info.js'),
+  );
+
+  const hotchain = await EV(agoricNames).lookup('chain', 'hot');
+  t.deepEqual(hotchain, { allegedName: 'Hot New Chain', chainId: 'hot-1' });
+
+  const connection = await EV(agoricNames).lookup(
+    'chainConnection',
+    'cosmoshub-4_hot-1',
+  );
+  t.like(connection, {
+    id: 'connection-99',
+    client_id: '07-tendermint-3',
+  });
+});
diff --git a/packages/builders/scripts/testing/append-chain-info.js b/packages/builders/scripts/testing/append-chain-info.js
new file mode 100644
index 00000000000..f141fe49074
--- /dev/null
+++ b/packages/builders/scripts/testing/append-chain-info.js
@@ -0,0 +1,50 @@
+/// <reference types="ses" />
+import { makeHelpers } from '@agoric/deploy-script-support';
+
+/** @type {Record<string, import('@agoric/orchestration/src/chain-info.js').ChainInfo>} */
+const chainInfo = {
+  hot: {
+    allegedName: 'Hot New Chain',
+    chainId: 'hot-1',
+    connections: {
+      'cosmoshub-4': {
+        id: 'connection-99',
+        client_id: '07-tendermint-3',
+        counterparty: {
+          client_id: '07-tendermint-2',
+          connection_id: 'connection-1',
+          prefix: {
+            key_prefix: '',
+          },
+        },
+        state: 3 /* IBCConnectionState.STATE_OPEN */,
+        transferChannel: {
+          portId: 'transfer',
+          channelId: 'channel-1',
+          counterPartyChannelId: 'channel-1',
+          counterPartyPortId: 'transfer',
+          ordering: 1 /* Order.ORDER_UNORDERED */,
+          state: 3 /* IBCConnectionState.STATE_OPEN */,
+          version: 'ics20-1',
+        },
+      },
+    },
+  },
+};
+
+/** @type {import('@agoric/deploy-script-support/src/externalTypes.js').CoreEvalBuilder} */
+export const defaultProposalBuilder = async () =>
+  harden({
+    sourceSpec: '@agoric/orchestration/src/proposals/revise-chain-info.js',
+    getManifestCall: [
+      'getManifestForReviseChains',
+      {
+        chainInfo,
+      },
+    ],
+  });
+
+export default async (homeP, endowments) => {
+  const { writeCoreEval } = await makeHelpers(homeP, endowments);
+  await writeCoreEval('revise-chain-info', defaultProposalBuilder);
+};
diff --git a/packages/builders/scripts/testing/tweak-chain-info.js b/packages/builders/scripts/testing/tweak-chain-info.js
new file mode 100644
index 00000000000..922300ea7c0
--- /dev/null
+++ b/packages/builders/scripts/testing/tweak-chain-info.js
@@ -0,0 +1,53 @@
+/// <reference types="ses" />
+import { makeHelpers } from '@agoric/deploy-script-support';
+
+/** @type {Record<string, import('@agoric/orchestration/src/chain-info.js').ChainInfo>} */
+const chainInfo = {
+  agoric: {
+    chainId: 'agoric-4',
+  },
+  hot: {
+    allegedName: 'Hot New Chain',
+    chainId: 'hot-1',
+    connections: {
+      'cosmoshub-4': {
+        id: 'connection-99',
+        client_id: '07-tendermint-3',
+        counterparty: {
+          client_id: '07-tendermint-2',
+          connection_id: 'connection-1',
+          prefix: {
+            key_prefix: '',
+          },
+        },
+        state: 3 /* IBCConnectionState.STATE_OPEN */,
+        transferChannel: {
+          portId: 'transfer',
+          channelId: 'channel-1',
+          counterPartyChannelId: 'channel-1',
+          counterPartyPortId: 'transfer',
+          ordering: 1 /* Order.ORDER_UNORDERED */,
+          state: 3 /* IBCConnectionState.STATE_OPEN */,
+          version: 'ics20-1',
+        },
+      },
+    },
+  },
+};
+
+/** @type {import('@agoric/deploy-script-support/src/externalTypes.js').CoreEvalBuilder} */
+export const defaultProposalBuilder = async () =>
+  harden({
+    sourceSpec: '@agoric/orchestration/src/proposals/revise-chain-info.js',
+    getManifestCall: [
+      'getManifestForReviseChains',
+      {
+        chainInfo,
+      },
+    ],
+  });
+
+export default async (homeP, endowments) => {
+  const { writeCoreEval } = await makeHelpers(homeP, endowments);
+  await writeCoreEval('revise-chain-info', defaultProposalBuilder);
+};
diff --git a/packages/orchestration/src/proposals/revise-chain-info.js b/packages/orchestration/src/proposals/revise-chain-info.js
new file mode 100644
index 00000000000..b864bfedfc1
--- /dev/null
+++ b/packages/orchestration/src/proposals/revise-chain-info.js
@@ -0,0 +1,44 @@
+import { makeTracer } from '@agoric/internal';
+import { registerChain } from '../chain-info.js';
+
+const trace = makeTracer('ReviseChainInfo', true);
+
+/** @import {CosmosChainInfo} from '../types.js'; */
+
+/**
+ * This will add news values AND overwrite any existing values. Voters on a
+ * proposal of core-eval must be careful not to overwrite any values operating
+ * in production.
+ *
+ * @param {BootstrapPowers} powers
+ * @param {{ options: { chainInfo: Record<string, CosmosChainInfo> } }} opt
+ */
+export const reviseChainInfo = async (
+  { consume: { agoricNamesAdmin } },
+  { options: { chainInfo } },
+) => {
+  trace('init-chainInfo');
+
+  assert(chainInfo, 'chainInfo is required');
+
+  trace(chainInfo);
+
+  // Now register the names
+  for await (const [name, info] of Object.entries(chainInfo)) {
+    await registerChain(agoricNamesAdmin, name, info, trace);
+  }
+};
+harden(reviseChainInfo);
+
+export const getManifestForReviseChains = (_powers, { chainInfo }) => ({
+  manifest: {
+    [reviseChainInfo.name]: {
+      consume: {
+        agoricNamesAdmin: true,
+      },
+    },
+  },
+  options: {
+    chainInfo,
+  },
+});