diff --git a/packages/vats/src/orch-purse/mock-orch-chain.js b/packages/vats/src/orch-purse/mock-orch-chain.js
index 189edd797fa0..ae30fbeb1d48 100644
--- a/packages/vats/src/orch-purse/mock-orch-chain.js
+++ b/packages/vats/src/orch-purse/mock-orch-chain.js
@@ -16,14 +16,6 @@ import {
  * @import {Zone} from '@agoric/base-zone'
  */
 
-const makeMinDenomInfo = (chain, _denom) => {
-  const brand = {}; // TODO the whole thing
-  return harden({
-    brand,
-    chain,
-  });
-};
-
 /**
  * @param {Zone} zone
  */
@@ -31,28 +23,28 @@ export const prepareMinOrchestrator = zone => {
   const makeMinOrchAccount = zone.exoClass(
     'MinOrchAccount',
     MinOrchAccountI,
-    (chain, ledger) => {
-      const addrValue = `${ledger.size()}`;
-      return { chain, ledger, addrValue };
+    (chains, denoms, accounts, chain) => {
+      const acctAddrValue = `${accounts.size()}`;
+      return { chains, denoms, accounts, chain, acctAddrValue };
     },
     {
       getAddress() {
-        const { chain, addrValue: value } = this.state;
+        const { chain, acctAddrValue } = this.state;
         const { chainId } = chain.getChainInfo();
-        return harden({ chainId, value });
+        return harden({ chainId, value: acctAddrValue });
       },
       getBalances() {
-        const { ledger, addrValue } = this.state;
-        const { balances } = ledger.get(addrValue);
+        const { ledger, acctAddrValue } = this.state;
+        const { balances } = ledger.get(acctAddrValue);
         return [...balances.values()];
       },
       getBalance(denom) {
-        const { ledger, addrValue } = this.state;
-        const { balances } = ledger.get(addrValue);
+        const { ledger, acctAddrValue } = this.state;
+        const { balances } = ledger.get(acctAddrValue);
         return balances.get(denom);
       },
-      transfer(destAddr, denomAmount) {
-
+      transfer(_destAddr, _denomAmount) {
+        // TODO
       },
     },
   );
@@ -60,19 +52,10 @@ export const prepareMinOrchestrator = zone => {
   const makeMinChain = zone.exoClass(
     'MinChain',
     MinChainI,
-    chainName => ({
+    (chains, denoms, chainName) => ({
+      chains,
+      denoms,
       chainId: chainName,
-      denoms: zone.mapStore('denoms', {
-        keyShape: M.string(), // denom
-        valueShape: MinDenomInfoShape,
-      }),
-      ledger: zone.mapStore('accounts', {
-        keyShape: M.string(), // addrValue
-        valueShape: {
-          account: MinOrchAccountShape,
-          balances: M.remotable('balances'),
-        },
-      }),
     }),
     {
       getChainInfo() {
@@ -80,12 +63,14 @@ export const prepareMinOrchestrator = zone => {
         return harden({ chainId });
       },
       makeAccount() {
-        const { ledger } = this.state;
         const { self } = this;
-        const account = makeMinOrchAccount(self, ledger);
-        const { value: addrValue } = account.getAddress();
-        ledger.init(
-          addrValue,
+        const { chains, denoms, chainId } = this.state;
+        const { accounts } = chains.get(chainId);
+
+        const account = makeMinOrchAccount(chains, denoms, accounts, self);
+        const { value: acctAddrValue } = account.getAddress();
+        accounts.init(
+          acctAddrValue,
           harden({
             account,
             balances: zone.mapStore('balances', {
@@ -96,16 +81,8 @@ export const prepareMinOrchestrator = zone => {
         );
         return account;
       },
-      getDenomInfo(denom) {
-        const { denoms } = this.state;
-        const { self } = this;
-        return provideLazy(denoms, denom, d => makeMinDenomInfo(self, d));
-      },
-      asAmount(denomAmount) {
-        const { self } = this;
-        const { denom, value } = denomAmount;
-        const { brand } = self.getDenomInfo(denom);
-        return AmountMath.make(brand, value);
+      makeDenom(_denom) {
+        // TODO return orchIssuerKit
       },
     },
   );
@@ -115,14 +92,48 @@ export const prepareMinOrchestrator = zone => {
     MinOrchestratorI,
     () => ({
       chains: zone.mapStore('chains', {
-        keyShape: M.string(),
-        valueShape: MinChainShape,
+        keyShape: M.string(), // chainName === chainId
+        valueShape: {
+          chain: MinChainShape,
+          denoms: M.remotable('denoms'),
+          accounts: M.remotable('accounts'),
+        },
+      }),
+      denoms: zone.mapStore('denoms', {
+        keyShape: M.string(), // denom
+        valueShape: MinDenomInfoShape,
       }),
     }),
     {
       getChain(chainName) {
-        const { chains } = this.state;
-        return provideLazy(chains, chainName, makeMinChain);
+        const { chains, denoms } = this.state;
+        const { chain } = provideLazy(chains, chainName, cName => {
+          const ch = makeMinChain(chains, denoms, cName);
+          chains.init(
+            chainName,
+            harden({
+              ch,
+              accounts: zone.mapStore('accounts', {
+                keyShape: M.string(), // acctAddrValue
+                valueShape: {
+                  account: MinOrchAccountShape,
+                  balances: M.remotable('balances'),
+                },
+              }),
+            }),
+          );
+        });
+        return chain;
+      },
+      getDenomInfo(denom) {
+        const { denoms } = this.state;
+        return denoms.get(denom);
+      },
+      asAmount(denomAmount) {
+        const { self } = this;
+        const { denom, value } = denomAmount;
+        const { brand } = self.getDenomInfo(denom);
+        return AmountMath.make(brand, value);
       },
     },
   );
diff --git a/packages/vats/src/orch-purse/typeGuards.js b/packages/vats/src/orch-purse/typeGuards.js
index 8ad2dc75e6eb..0df8582efd92 100644
--- a/packages/vats/src/orch-purse/typeGuards.js
+++ b/packages/vats/src/orch-purse/typeGuards.js
@@ -62,9 +62,8 @@ export const MinChainI = M.interface('MinChain', {
   getChainInfo: M.call().returns(M.eref(ChainInfoShape)),
   makeAccount: M.call().returns(M.eref(MinOrchAccountShape)),
 
-  // In the real API, these are on OrchestratorI
-  getDenomInfo: M.call(DenomShape).returns(MinDenomInfoShape),
-  asAmount: M.call(DenomAmountShape).returns(AmountShape),
+  // TODO returns(OrchIssuerKitShape)
+  makeDenom: M.call(DenomShape).returns(M.any()),
 });
 
 /**
@@ -73,6 +72,8 @@ export const MinChainI = M.interface('MinChain', {
  */
 export const MinOrchestratorI = M.interface('MinOrchestrator', {
   getChain: M.call(M.string()).returns(M.eref(MinChainShape)),
+  getDenomInfo: M.call(DenomShape).returns(MinDenomInfoShape),
+  asAmount: M.call(DenomAmountShape).returns(AmountShape),
 });
 
 // //////////////////////// ERTP-like //////////////////////////////////////////
diff --git a/packages/vats/src/orch-purse/types.ts b/packages/vats/src/orch-purse/types.ts
index 41bb0e566275..79d25bfcaa58 100644
--- a/packages/vats/src/orch-purse/types.ts
+++ b/packages/vats/src/orch-purse/types.ts
@@ -13,7 +13,7 @@ import type { Denom, DenomAmount, ChainAddress } from '@agoric/orchestration';
  */
 export type MinChainAcctAddr = {
   chainId: string;
-  value: string;
+  value: string; // acctAddrValue
 };
 
 /**
@@ -50,9 +50,7 @@ export type MinChain = {
   getChainInfo(): ERef<MinChainInfo>;
   makeAccount(): ERef<MinOrchAccount>;
 
-  // In the real API, these are on Orchestrator
-  getDenomInfo(denom: Denom): MinDenomInfo;
-  asAmount(denomAmount: DenomAmount): Amount;
+  makeDenom(denom: Denom): any; // TODO OrchIssuerKit
 };
 
 /**
@@ -60,6 +58,8 @@ export type MinChain = {
  */
 export type MinOrchestrator = {
   getChain(chainName: string): ERef<MinChain>;
+  getDenomInfo(denom: Denom): MinDenomInfo;
+  asAmount(denomAmount: DenomAmount): Amount;
 };
 
 // //////////////////////// ERTP-like //////////////////////////////////////////