diff --git a/packages/orchestration/src/chain-info.js b/packages/orchestration/src/chain-info.js
index f387faca34e..3cbc182bb5c 100644
--- a/packages/orchestration/src/chain-info.js
+++ b/packages/orchestration/src/chain-info.js
@@ -1,4 +1,4 @@
-import { registerChain } from './utils/chainHub.js';
+import { registerChain } from './exos/chain-hub.js';
 
 // Refresh with scripts/refresh-chain-info.ts
 import fetchedChainInfo from './fetched-chain-info.js';
diff --git a/packages/orchestration/src/examples/stakeBld.contract.js b/packages/orchestration/src/examples/stakeBld.contract.js
index 009094e802e..1652ae606fd 100644
--- a/packages/orchestration/src/examples/stakeBld.contract.js
+++ b/packages/orchestration/src/examples/stakeBld.contract.js
@@ -11,7 +11,7 @@ import { E } from '@endo/far';
 import { deeplyFulfilled } from '@endo/marshal';
 import { M } from '@endo/patterns';
 import { prepareLocalOrchestrationAccountKit } from '../exos/local-orchestration-account.js';
-import { makeChainHub } from '../utils/chainHub.js';
+import { makeChainHub } from '../exos/chain-hub.js';
 
 /**
  * @import {NameHub} from '@agoric/vats';
diff --git a/packages/orchestration/src/utils/chainHub.js b/packages/orchestration/src/exos/chain-hub.js
similarity index 86%
rename from packages/orchestration/src/utils/chainHub.js
rename to packages/orchestration/src/exos/chain-hub.js
index 6e7a0387239..321242ff812 100644
--- a/packages/orchestration/src/utils/chainHub.js
+++ b/packages/orchestration/src/exos/chain-hub.js
@@ -54,7 +54,38 @@ export const connectionKey = (chainId1, chainId2) => {
   return [chainId1, chainId2].sort().join(CHAIN_ID_SEPARATOR);
 };
 
+const ChainIdArgShape = M.or(
+  M.string(),
+  M.splitRecord(
+    {
+      chainId: M.string(),
+    },
+    undefined,
+    M.any(),
+  ),
+);
+
+const ChainHubI = M.interface('ChainHub', {
+  registerChain: M.call(M.string(), CosmosChainInfoShape).returns(),
+  getChainInfo: M.callWhen(M.string()).returns(CosmosChainInfoShape),
+  registerConnection: M.callWhen(
+    M.string(),
+    M.string(),
+    IBCConnectionInfoShape,
+  ).returns(),
+  getConnectionInfo: M.callWhen(ChainIdArgShape, ChainIdArgShape).returns(
+    IBCConnectionInfoShape,
+  ),
+});
+
 /**
+ * Make a new ChainHub in the zone (or in the heap if no zone is provided).
+ *
+ * The resulting object is an Exo singleton. It has no precious state. It's only
+ * state is a cache of queries to agoricNames and whatever info was provided in
+ * registration calls. When you need a newer version you can simply make a hub
+ * hub and repeat the registrations.
+ *
  * @param {Remote<NameHub>} agoricNames
  * @param {Zone} [zone]
  */
@@ -70,7 +101,7 @@ export const makeChainHub = (agoricNames, zone = makeHeapZone()) => {
     valueShape: IBCConnectionInfoShape,
   });
 
-  const chainHub = harden({
+  const chainHub = zone.exo('ChainHub', ChainHubI, {
     /**
      * Register a new chain. The name will override a name in well known chain
      * names.
diff --git a/packages/orchestration/src/exos/local-orchestration-account.js b/packages/orchestration/src/exos/local-orchestration-account.js
index 15e28d830a1..02a59a86b24 100644
--- a/packages/orchestration/src/exos/local-orchestration-account.js
+++ b/packages/orchestration/src/exos/local-orchestration-account.js
@@ -25,7 +25,7 @@ import { dateInSeconds, makeTimestampHelper } from '../utils/time.js';
  * @import {TimerService, TimerBrand, TimestampRecord} from '@agoric/time';
  * @import {PromiseVow, VowTools} from '@agoric/vow';
  * @import {TypedJson} from '@agoric/cosmic-proto';
- * @import {ChainHub} from '../utils/chainHub.js';
+ * @import {ChainHub} from './chain-hub.js';
  */
 
 const trace = makeTracer('LOA');
diff --git a/packages/orchestration/src/exos/orchestrator.js b/packages/orchestration/src/exos/orchestrator.js
index 1ffab8c2613..02087425537 100644
--- a/packages/orchestration/src/exos/orchestrator.js
+++ b/packages/orchestration/src/exos/orchestrator.js
@@ -13,7 +13,7 @@ import {
 
 /**
  * @import {Zone} from '@agoric/base-zone';
- * @import {ChainHub} from '../utils/chainHub.js';
+ * @import {ChainHub} from './chain-hub.js';
  * @import {AsyncFlowTools} from '@agoric/async-flow';
  * @import {Vow} from '@agoric/vow';
  * @import {TimerService} from '@agoric/time';
diff --git a/packages/orchestration/src/facade.js b/packages/orchestration/src/facade.js
index 6de79caa23f..b4f6c97d81c 100644
--- a/packages/orchestration/src/facade.js
+++ b/packages/orchestration/src/facade.js
@@ -28,7 +28,7 @@ import { prepareOrchestrator } from './exos/orchestrator.js';
  *   storageNode: Remote<StorageNode>;
  *   orchestrationService: Remote<OrchestrationService>;
  *   localchain: Remote<LocalChain>;
- *   chainHub: import('./utils/chainHub.js').ChainHub;
+ *   chainHub: import('./exos/chain-hub.js').ChainHub;
  *   makeLocalOrchestrationAccountKit: MakeLocalOrchestrationAccountKit;
  *   makeRecorderKit: MakeRecorderKit;
  *   makeCosmosOrchestrationAccount: any;
diff --git a/packages/orchestration/src/proposals/orchestration-proposal.js b/packages/orchestration/src/proposals/orchestration-proposal.js
index 46846cd17f6..b45ff54cff1 100644
--- a/packages/orchestration/src/proposals/orchestration-proposal.js
+++ b/packages/orchestration/src/proposals/orchestration-proposal.js
@@ -3,7 +3,7 @@ import { E, Far } from '@endo/far';
 import { makeMarshal } from '@endo/marshal';
 import { Fail } from '@agoric/assert';
 import { registerChainNamespace } from '../chain-info.js';
-import { CHAIN_KEY, CONNECTIONS_KEY } from '../utils/chainHub.js';
+import { CHAIN_KEY, CONNECTIONS_KEY } from '../exos/chain-hub.js';
 
 const trace = makeTracer('CoreEvalOrchestration', true);
 
diff --git a/packages/orchestration/src/proposals/start-stakeAtom.js b/packages/orchestration/src/proposals/start-stakeAtom.js
index 470236c54f8..05a6069dd9f 100644
--- a/packages/orchestration/src/proposals/start-stakeAtom.js
+++ b/packages/orchestration/src/proposals/start-stakeAtom.js
@@ -1,7 +1,7 @@
 import { makeTracer } from '@agoric/internal';
 import { makeStorageNodeChild } from '@agoric/internal/src/lib-chainStorage.js';
 import { E } from '@endo/far';
-import { getChainsAndConnection, makeChainHub } from '../utils/chainHub.js';
+import { getChainsAndConnection, makeChainHub } from '../exos/chain-hub.js';
 
 /**
  * @import {IBCConnectionID} from '@agoric/vats';
diff --git a/packages/orchestration/src/proposals/start-stakeOsmo.js b/packages/orchestration/src/proposals/start-stakeOsmo.js
index d61b73b5ae6..c7911c5e74c 100644
--- a/packages/orchestration/src/proposals/start-stakeOsmo.js
+++ b/packages/orchestration/src/proposals/start-stakeOsmo.js
@@ -1,7 +1,7 @@
 import { makeTracer } from '@agoric/internal';
 import { makeStorageNodeChild } from '@agoric/internal/src/lib-chainStorage.js';
 import { E } from '@endo/far';
-import { getChainsAndConnection, makeChainHub } from '../utils/chainHub.js';
+import { getChainsAndConnection, makeChainHub } from '../exos/chain-hub.js';
 
 /**
  * @import {IBCConnectionID} from '@agoric/vats';
diff --git a/packages/orchestration/src/utils/start-helper.js b/packages/orchestration/src/utils/start-helper.js
index 8ec73eb8bea..c064bca441b 100644
--- a/packages/orchestration/src/utils/start-helper.js
+++ b/packages/orchestration/src/utils/start-helper.js
@@ -4,7 +4,7 @@ import { prepareRecorderKitMakers } from '@agoric/zoe/src/contractSupport/record
 import { makeDurableZone } from '@agoric/zone/durable.js';
 import { prepareLocalOrchestrationAccountKit } from '../exos/local-orchestration-account.js';
 import { makeOrchestrationFacade } from '../facade.js';
-import { makeChainHub } from './chainHub.js';
+import { makeChainHub } from '../exos/chain-hub.js';
 import { prepareRemoteChainFacade } from '../exos/remote-chain-facade.js';
 import { prepareCosmosOrchestrationAccount } from '../exos/cosmos-orchestration-account.js';
 import { prepareLocalChainFacade } from '../exos/local-chain-facade.js';
diff --git a/packages/orchestration/test/examples/sendAnywhere.test.ts b/packages/orchestration/test/examples/sendAnywhere.test.ts
index 6c5b44a23f7..d3d44833155 100644
--- a/packages/orchestration/test/examples/sendAnywhere.test.ts
+++ b/packages/orchestration/test/examples/sendAnywhere.test.ts
@@ -9,7 +9,7 @@ import { makeIssuerKit } from '@agoric/ertp';
 import { CosmosChainInfo, IBCConnectionInfo } from '../../src/cosmos-api.js';
 import { commonSetup } from '../supports.js';
 import { SingleAmountRecord } from '../../src/examples/sendAnywhere.contract.js';
-import { registerChain } from '../../src/utils/chainHub.js';
+import { registerChain } from '../../src/exos/chain-hub.js';
 
 const dirname = path.dirname(new URL(import.meta.url).pathname);
 
diff --git a/packages/orchestration/test/utils/chainHub.test.ts b/packages/orchestration/test/exos/chain-hub.test.ts
similarity index 95%
rename from packages/orchestration/test/utils/chainHub.test.ts
rename to packages/orchestration/test/exos/chain-hub.test.ts
index 4f02ad81afa..516d07a44c6 100644
--- a/packages/orchestration/test/utils/chainHub.test.ts
+++ b/packages/orchestration/test/exos/chain-hub.test.ts
@@ -2,7 +2,7 @@
 import test from '@endo/ses-ava/prepare-endo.js';
 
 import { makeNameHubKit } from '@agoric/vats';
-import { makeChainHub } from '../../src/utils/chainHub.js';
+import { makeChainHub } from '../../src/exos/chain-hub.js';
 
 const connection = {
   id: 'connection-1',
diff --git a/packages/orchestration/test/exos/local-orchestration-account-kit.test.ts b/packages/orchestration/test/exos/local-orchestration-account-kit.test.ts
index dfff8afc620..21ba90fcd68 100644
--- a/packages/orchestration/test/exos/local-orchestration-account-kit.test.ts
+++ b/packages/orchestration/test/exos/local-orchestration-account-kit.test.ts
@@ -7,7 +7,7 @@ import { prepareRecorderKitMakers } from '@agoric/zoe/src/contractSupport/record
 import { Far } from '@endo/far';
 import { prepareLocalOrchestrationAccountKit } from '../../src/exos/local-orchestration-account.js';
 import { ChainAddress } from '../../src/orchestration-api.js';
-import { makeChainHub } from '../../src/utils/chainHub.js';
+import { makeChainHub } from '../../src/exos/chain-hub.js';
 import { NANOSECONDS_PER_SECOND } from '../../src/utils/time.js';
 import { commonSetup } from '../supports.js';