diff --git a/test/000_fullchain-boost.test.ts b/test/000_fullchain-boost.test.ts
index 186cc9e6..c5f8871c 100644
--- a/test/000_fullchain-boost.test.ts
+++ b/test/000_fullchain-boost.test.ts
@@ -38,7 +38,7 @@ import {
 } from '../utils/poco-tools';
 import { IexecWrapper } from './utils/IexecWrapper';
 import { loadHardhatFixtureDeployment } from './utils/hardhat-fixture-deployer';
-import { randomAddress } from './utils/utils';
+import { expectProxyBalanceToEqualAllFrozen, randomAddress } from './utils/utils';
 
 const taskIndex = 0n;
 const volume = taskIndex + 1n;
@@ -109,6 +109,10 @@ describe('IexecPocoBoostFacet (IT)', function () {
         await iexecWrapper.setTeeBroker('0x0000000000000000000000000000000000000000');
     });
 
+    afterEach('Check escrow invariant', async () => {
+        await expectProxyBalanceToEqualAllFrozen(proxyAddress);
+    });
+
     async function initFixture() {
         const accounts = await getIexecAccounts();
         ({
diff --git a/test/000_fullchain.test.ts b/test/000_fullchain.test.ts
index ddda44e8..3d91b38a 100644
--- a/test/000_fullchain.test.ts
+++ b/test/000_fullchain.test.ts
@@ -16,7 +16,7 @@ import {
 } from '../utils/poco-tools';
 import { IexecWrapper } from './utils/IexecWrapper';
 import { loadHardhatFixtureDeployment } from './utils/hardhat-fixture-deployer';
-import { randomAddress } from './utils/utils';
+import { expectProxyBalanceToEqualAllFrozen, randomAddress } from './utils/utils';
 
 //  +---------+-------------+-------------+-------------+----------+-----+---------------------------------------------+
 //  |         | Sponsorship | Replication | Beneficiary | Callback | BoT |              Type                           |
@@ -67,6 +67,10 @@ describe('Integration tests', function () {
         await loadFixture(initFixture);
     });
 
+    afterEach('Check escrow invariant', async () => {
+        await expectProxyBalanceToEqualAllFrozen(proxyAddress);
+    });
+
     async function initFixture() {
         const accounts = await getIexecAccounts();
         ({
diff --git a/test/200_fullchain-bot.test.ts b/test/200_fullchain-bot.test.ts
index 9012ac82..ff86e2ee 100644
--- a/test/200_fullchain-bot.test.ts
+++ b/test/200_fullchain-bot.test.ts
@@ -10,6 +10,7 @@ import { OrdersActors, OrdersAssets, OrdersPrices, buildOrders } from '../utils/
 import { TaskStatusEnum, buildUtf8ResultAndDigest, getIexecAccounts } from '../utils/poco-tools';
 import { IexecWrapper } from './utils/IexecWrapper';
 import { loadHardhatFixtureDeployment } from './utils/hardhat-fixture-deployer';
+import { expectProxyBalanceToEqualAllFrozen } from './utils/utils';
 
 const appPrice = 1000n;
 const datasetPrice = 1_000_000n;
@@ -43,6 +44,10 @@ describe('Integration tests', function () {
         await loadFixture(initFixture);
     });
 
+    afterEach('Check escrow invariant', async () => {
+        await expectProxyBalanceToEqualAllFrozen(proxyAddress);
+    });
+
     async function initFixture() {
         const accounts = await getIexecAccounts();
         ({
diff --git a/test/201_fullchain-multi-orders.test.ts b/test/201_fullchain-multi-orders.test.ts
index 4a0c5a64..efe56663 100644
--- a/test/201_fullchain-multi-orders.test.ts
+++ b/test/201_fullchain-multi-orders.test.ts
@@ -23,6 +23,7 @@ import {
 import { maxBigInt, minBigInt } from '../utils/tools';
 import { IexecWrapper } from './utils/IexecWrapper';
 import { loadHardhatFixtureDeployment } from './utils/hardhat-fixture-deployer';
+import { expectProxyBalanceToEqualAllFrozen } from './utils/utils';
 
 const appPrice = 1000n;
 const datasetPrice = 1_000_000n;
@@ -47,6 +48,10 @@ describe('Integration tests', function () {
         await loadFixture(initFixture);
     });
 
+    afterEach('Check escrow invariant', async () => {
+        await expectProxyBalanceToEqualAllFrozen(proxyAddress);
+    });
+
     async function initFixture() {
         const accounts = await getIexecAccounts();
         ({ requester, appProvider, datasetProvider, scheduler, anyone, worker1 } = accounts);
diff --git a/test/300_fullchain-reopen.test.ts b/test/300_fullchain-reopen.test.ts
index 960e916d..2505a438 100644
--- a/test/300_fullchain-reopen.test.ts
+++ b/test/300_fullchain-reopen.test.ts
@@ -9,6 +9,7 @@ import { ZeroAddress } from 'ethers';
 import { IexecInterface, IexecInterface__factory } from '../typechain';
 import { OrdersActors, OrdersAssets, OrdersPrices, buildOrders } from '../utils/createOrders';
 import { loadHardhatFixtureDeployment } from './utils/hardhat-fixture-deployer';
+import { expectProxyBalanceToEqualAllFrozen } from './utils/utils';
 
 import { TAG_STANDARD } from '../utils/constants';
 import {
@@ -52,6 +53,10 @@ describe('Integration tests', function () {
         await loadFixture(initFixture);
     });
 
+    afterEach('Check escrow invariant', async () => {
+        await expectProxyBalanceToEqualAllFrozen(proxyAddress);
+    });
+
     async function initFixture() {
         const accounts = await getIexecAccounts();
         ({
diff --git a/test/byContract/IexecERC20/IexecERC20.test.ts b/test/byContract/IexecERC20/IexecERC20.test.ts
index ef69d0ba..ee696eb0 100644
--- a/test/byContract/IexecERC20/IexecERC20.test.ts
+++ b/test/byContract/IexecERC20/IexecERC20.test.ts
@@ -15,7 +15,7 @@ import {
 import { getIexecAccounts } from '../../../utils/poco-tools';
 import { IexecWrapper } from '../../utils/IexecWrapper';
 import { loadHardhatFixtureDeployment } from '../../utils/hardhat-fixture-deployer';
-import { setZeroAddressBalance } from '../../utils/utils';
+import { expectProxyBalanceToEqualAllFrozen, setZeroAddressBalance } from '../../utils/utils';
 
 const value = 100n;
 
@@ -33,6 +33,10 @@ describe('ERC20', async () => {
         await loadFixture(initFixture);
     });
 
+    afterEach('Check escrow invariant', async () => {
+        await expectProxyBalanceToEqualAllFrozen(proxyAddress);
+    });
+
     async function initFixture() {
         const accounts = await getIexecAccounts();
         // Setup current test accounts from some arbitrary iExec accounts
diff --git a/test/byContract/IexecEscrow/IexecEscrow.test.ts b/test/byContract/IexecEscrow/IexecEscrow.test.ts
index 626135fe..c193eb49 100644
--- a/test/byContract/IexecEscrow/IexecEscrow.test.ts
+++ b/test/byContract/IexecEscrow/IexecEscrow.test.ts
@@ -9,7 +9,7 @@ import { ethers } from 'hardhat';
 import { IexecInterface, IexecInterface__factory, RLC, RLC__factory } from '../../../typechain';
 import { getIexecAccounts } from '../../../utils/poco-tools';
 import { loadHardhatFixtureDeployment } from '../../utils/hardhat-fixture-deployer';
-import { setZeroAddressBalance } from '../../utils/utils';
+import { expectProxyBalanceToEqualAllFrozen, setZeroAddressBalance } from '../../utils/utils';
 
 const amount = ethers.parseUnits('100', 9);
 
@@ -24,6 +24,10 @@ describe('IexecEscrow', () => {
         await loadFixture(initFixture);
     });
 
+    afterEach('Check escrow invariant', async () => {
+        await expectProxyBalanceToEqualAllFrozen(proxyAddress);
+    });
+
     async function initFixture() {
         const accounts = await getIexecAccounts();
         ({
diff --git a/test/byContract/IexecPoco/IexecPoco2-claim.test.ts b/test/byContract/IexecPoco/IexecPoco2-claim.test.ts
index 5955529e..f606d13e 100644
--- a/test/byContract/IexecPoco/IexecPoco2-claim.test.ts
+++ b/test/byContract/IexecPoco/IexecPoco2-claim.test.ts
@@ -17,6 +17,7 @@ import {
 } from '../../../utils/poco-tools';
 import { IexecWrapper } from '../../utils/IexecWrapper';
 import { loadHardhatFixtureDeployment } from '../../utils/hardhat-fixture-deployer';
+import { expectProxyBalanceToEqualAllFrozen } from '../../utils/utils';
 import * as constants from './../../../utils/constants';
 
 const categoryTime = 300n;
@@ -46,6 +47,10 @@ describe('IexecPoco2#claim', async () => {
         await loadFixture(initFixture);
     });
 
+    afterEach('Check escrow invariant', async () => {
+        await expectProxyBalanceToEqualAllFrozen(proxyAddress);
+    });
+
     async function initFixture() {
         const accounts = await getIexecAccounts();
         ({ iexecAdmin, requester, sponsor, scheduler, worker1, worker2, anyone } = accounts);
diff --git a/test/byContract/IexecPoco/IexecPoco2-contribute-and-finalize.test.ts b/test/byContract/IexecPoco/IexecPoco2-contribute-and-finalize.test.ts
index 6a07801e..668e707b 100644
--- a/test/byContract/IexecPoco/IexecPoco2-contribute-and-finalize.test.ts
+++ b/test/byContract/IexecPoco/IexecPoco2-contribute-and-finalize.test.ts
@@ -22,6 +22,7 @@ import {
 } from '../../../utils/poco-tools';
 import { IexecWrapper } from '../../utils/IexecWrapper';
 import { loadHardhatFixtureDeployment } from '../../utils/hardhat-fixture-deployer';
+import { expectProxyBalanceToEqualAllFrozen } from '../../utils/utils';
 
 const appPrice = 1000n;
 const datasetPrice = 1_000_000n;
@@ -60,6 +61,10 @@ describe('IexecPoco2#contributeAndFinalize', () => {
         await loadFixture(initFixture);
     });
 
+    afterEach('Check escrow invariant', async () => {
+        await expectProxyBalanceToEqualAllFrozen(proxyAddress);
+    });
+
     async function initFixture() {
         const accounts = await getIexecAccounts();
         ({ requester, appProvider, datasetProvider, scheduler, sms, enclave, worker, anyone } =
diff --git a/test/byContract/IexecPoco/IexecPoco2-finalize.test.ts b/test/byContract/IexecPoco/IexecPoco2-finalize.test.ts
index bfa46d02..f8802599 100644
--- a/test/byContract/IexecPoco/IexecPoco2-finalize.test.ts
+++ b/test/byContract/IexecPoco/IexecPoco2-finalize.test.ts
@@ -24,6 +24,7 @@ import {
 import { getPocoStorageSlotLocation } from '../../../utils/proxy-tools';
 import { IexecWrapper } from '../../utils/IexecWrapper';
 import { loadHardhatFixtureDeployment } from '../../utils/hardhat-fixture-deployer';
+import { expectProxyBalanceToEqualAllFrozen } from '../../utils/utils';
 
 const { results, resultDigest } = buildUtf8ResultAndDigest('result');
 const hexResults = ethers.hexlify(results);
@@ -63,6 +64,10 @@ describe('IexecPoco2#finalize', async () => {
         await loadFixture(initFixture);
     });
 
+    afterEach('Check escrow invariant', async () => {
+        await expectProxyBalanceToEqualAllFrozen(proxyAddress);
+    });
+
     async function initFixture() {
         const accounts = await getIexecAccounts();
         ({
diff --git a/test/byContract/IexecPocoBoost/IexecPocoBoost.test.ts b/test/byContract/IexecPocoBoost/IexecPocoBoost.test.ts
index dbdb68ad..ceb66b72 100644
--- a/test/byContract/IexecPocoBoost/IexecPocoBoost.test.ts
+++ b/test/byContract/IexecPocoBoost/IexecPocoBoost.test.ts
@@ -59,7 +59,7 @@ import {
 } from '../../../utils/poco-tools';
 import { IexecWrapper } from '../../utils/IexecWrapper';
 import { loadHardhatFixtureDeployment } from '../../utils/hardhat-fixture-deployer';
-import { randomAddress } from '../../utils/utils';
+import { expectProxyBalanceToEqualAllFrozen, randomAddress } from '../../utils/utils';
 
 const taskIndex = 0n;
 const volume = taskIndex + 1n;
@@ -108,6 +108,10 @@ describe('IexecPocoBoost', function () {
         await loadFixture(initFixture);
     });
 
+    afterEach('Check escrow invariant', async () => {
+        await expectProxyBalanceToEqualAllFrozen(proxyAddress);
+    });
+
     async function initFixture() {
         const accounts = await getIexecAccounts();
         ({
diff --git a/test/utils/utils.ts b/test/utils/utils.ts
index c46ba500..90562a35 100644
--- a/test/utils/utils.ts
+++ b/test/utils/utils.ts
@@ -1,6 +1,7 @@
+import { expect } from 'chai';
 import { ZeroAddress } from 'ethers';
 import { ethers } from 'hardhat';
-import { IexecLibOrders_v5 } from '../../typechain';
+import { IexecInterface__factory, IexecLibOrders_v5 } from '../../typechain';
 
 export async function hashDomain(domain: IexecLibOrders_v5.EIP712DomainStructOutput) {
     return ethers.TypedDataEncoder.hashDomain({
@@ -30,3 +31,31 @@ export async function setZeroAddressBalance() {
 export function randomAddress() {
     return ethers.Wallet.createRandom().address;
 }
+
+/**
+ * Assert the escrow invariant: the sRLC held by the proxy is exactly the sum of
+ * every account's frozen sRLC.
+ *
+ * `EscrowLib.seize` and `EscrowLib.rewardAndLock` are the only escrow operations
+ * that write `m_frozens` without an sRLC transfer, so they preserve this
+ * invariant only when they are paired on the same value. Per-account balance and
+ * frozen deltas cannot detect such a mismatch: a seize without its
+ * `rewardAndLock` leaves the proxy holding sRLC no account can claim, and the
+ * opposite leaves frozen values that a later unlock cannot transfer.
+ *
+ * The invariant assumes no account sRLC-transfers to the proxy outside of the
+ * escrow (`transfer(proxyAddress, ...)` or `depositFor(proxyAddress, ...)`),
+ * which no production code path does.
+ */
+export async function expectProxyBalanceToEqualAllFrozen(proxyAddress: string) {
+    const iexecPoco = IexecInterface__factory.connect(proxyAddress, ethers.provider);
+    const accounts = [
+        proxyAddress, // The proxy itself never freezes, but a non null value would break the sum.
+        await iexecPoco.kitty_address(),
+        ...(await ethers.getSigners()).map((signer) => signer.address),
+    ];
+    const totalFrozen = await Promise.all(
+        accounts.map((account) => iexecPoco.frozenOf(account)),
+    ).then((frozens) => frozens.reduce((total, frozen) => total + frozen, 0n));
+    expect(await iexecPoco.balanceOf(proxyAddress)).to.equal(totalFrozen);
+}