diff --git a/test/abstract/FlowERC1155Test.sol b/test/abstract/FlowERC1155Test.sol
new file mode 100644
index 00000000..79d6f96e
--- /dev/null
+++ b/test/abstract/FlowERC1155Test.sol
@@ -0,0 +1,44 @@
+// SPDX-License-Identifier: CAL
+pragma solidity ^0.8.18;
+
+import {Vm} from "forge-std/Test.sol";
+import {FlowUtilsAbstractTest} from "test/abstract/FlowUtilsAbstractTest.sol";
+import {InterpreterMockTest} from "test/abstract/InterpreterMockTest.sol";
+import {IFlowERC1155V5, FlowERC1155ConfigV3} from "src/interface/unstable/IFlowERC1155V5.sol";
+import {EvaluableConfigV3} from "rain.interpreter.interface/interface/IInterpreterCallerV2.sol";
+import {STUB_EXPRESSION_BYTECODE} from "./TestConstants.sol";
+import {EvaluableV2} from "rain.interpreter.interface/lib/caller/LibEvaluable.sol";
+import {CloneFactory} from "rain.factory/src/concrete/CloneFactory.sol";
+import {FlowERC1155} from "../../src/concrete/erc1155/FlowERC1155.sol";
+
+abstract contract FlowERC1155Test is FlowUtilsAbstractTest, InterpreterMockTest {
+    CloneFactory internal immutable iCloneFactory;
+    IFlowERC1155V5 internal immutable iFlowImplementation;
+
+    constructor() {
+        vm.pauseGasMetering();
+        iCloneFactory = new CloneFactory();
+        iFlowImplementation = new FlowERC1155();
+        vm.resumeGasMetering();
+    }
+
+    function deployIFlowERC1155V5(string memory uri)
+        internal
+        returns (IFlowERC1155V5 flowErc1155, EvaluableV2 memory evaluable)
+    {
+        expressionDeployerDeployExpression2MockCall(address(0), bytes(hex"0006"));
+        // Create the evaluableConfig
+        EvaluableConfigV3 memory evaluableConfig =
+            EvaluableConfigV3(iDeployer, STUB_EXPRESSION_BYTECODE, new uint256[](0));
+        // Create the flowConfig array with one entry
+        EvaluableConfigV3[] memory flowConfigArray = new EvaluableConfigV3[](1);
+        flowConfigArray[0] = evaluableConfig;
+        // Initialize the FlowERC1155ConfigV3 struct
+        FlowERC1155ConfigV3 memory flowErc1155Config = FlowERC1155ConfigV3(uri, evaluableConfig, flowConfigArray);
+        vm.recordLogs();
+        flowErc1155 = IFlowERC1155V5(iCloneFactory.clone(address(iFlowImplementation), abi.encode(flowErc1155Config)));
+        Vm.Log[] memory logs = vm.getRecordedLogs();
+        Vm.Log memory concreteEvent = findEvent(logs, keccak256("FlowInitialized(address,(address,address,address))"));
+        (, evaluable) = abi.decode(concreteEvent.data, (address, EvaluableV2));
+    }
+}
diff --git a/test/concrete/flowErc1155/FlowSignedContextTest.sol b/test/concrete/flowErc1155/FlowSignedContextTest.sol
new file mode 100644
index 00000000..2c633840
--- /dev/null
+++ b/test/concrete/flowErc1155/FlowSignedContextTest.sol
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: CAL
+pragma solidity ^0.8.19;
+
+import {Test, Vm} from "forge-std/Test.sol";
+import {FlowERC1155} from "../../../src/concrete/erc1155/FlowERC1155.sol";
+import {
+    FlowUtilsAbstractTest,
+    ERC20Transfer,
+    ERC721Transfer,
+    ERC1155Transfer,
+    ERC1155SupplyChange
+} from "test/abstract/FlowUtilsAbstractTest.sol";
+import {IFlowERC1155V5} from "../../../src/interface/unstable/IFlowERC1155V5.sol";
+import {EvaluableV2, SignedContextV1} from "rain.interpreter.interface/interface/IInterpreterCallerV2.sol";
+import {InvalidSignature} from "rain.interpreter.interface/lib/caller/LibContext.sol";
+import {FlowERC1155Test} from "../../abstract/FlowERC1155Test.sol";
+import {SignContextLib} from "test/lib/SignContextLib.sol";
+
+contract FlowSignedContextTest is FlowUtilsAbstractTest, FlowERC1155Test {
+    using SignContextLib for Vm;
+
+    /// Should validate multiple signed contexts
+    function testValidateMultipleSignedContexts(
+        string memory uri,
+        uint256[] memory context0,
+        uint256[] memory context1,
+        uint256 fuzzedKeyAlice,
+        uint256 fuzzedKeyBob
+    ) public {
+        vm.assume(fuzzedKeyBob != fuzzedKeyAlice);
+        (IFlowERC1155V5 erc1155Flow, EvaluableV2 memory evaluable) = deployIFlowERC1155V5(uri);
+
+        // Ensure the fuzzed key is within the valid range for secp256k1
+        uint256 aliceKey = (fuzzedKeyAlice % (SECP256K1_ORDER - 1)) + 1;
+        uint256 bobKey = (fuzzedKeyBob % (SECP256K1_ORDER - 1)) + 1;
+
+        SignedContextV1[] memory signedContexts = new SignedContextV1[](2);
+
+        signedContexts[0] = vm.signContext(aliceKey, aliceKey, context0);
+        signedContexts[1] = vm.signContext(aliceKey, aliceKey, context1);
+
+        uint256[] memory stack = generateFlowERC1155Stack(
+            new ERC1155Transfer[](0),
+            new ERC721Transfer[](0),
+            new ERC20Transfer[](0),
+            new ERC1155SupplyChange[](0),
+            new ERC1155SupplyChange[](0)
+        );
+        interpreterEval2MockCall(stack, new uint256[](0));
+        erc1155Flow.flow(evaluable, new uint256[](0), signedContexts);
+
+        // With bad signature in second signed context
+        SignedContextV1[] memory signedContexts1 = new SignedContextV1[](2);
+        signedContexts1[0] = vm.signContext(aliceKey, aliceKey, context0);
+        signedContexts1[1] = vm.signContext(aliceKey, bobKey, context1);
+
+        uint256[] memory stack1 = generateFlowERC1155Stack(
+            new ERC1155Transfer[](0),
+            new ERC721Transfer[](0),
+            new ERC20Transfer[](0),
+            new ERC1155SupplyChange[](0),
+            new ERC1155SupplyChange[](0)
+        );
+        interpreterEval2MockCall(stack1, new uint256[](0));
+
+        vm.expectRevert(abi.encodeWithSelector(InvalidSignature.selector, 1));
+        erc1155Flow.flow(evaluable, new uint256[](0), signedContexts1);
+    }
+}
diff --git a/test/lib/SignContextLib.sol b/test/lib/SignContextLib.sol
index fe516ba9..0a2e08fb 100644
--- a/test/lib/SignContextLib.sol
+++ b/test/lib/SignContextLib.sol
@@ -7,7 +7,7 @@ import {ECDSAUpgradeable as ECDSA} from "openzeppelin/utils/cryptography/ECDSAUp
 import {SignedContextV1} from "rain.interpreter.interface/interface/IInterpreterCallerV2.sol";
 
 library SignContextLib {
-    function signContext(Vm vm, uint256 privateKey, uint256[] memory context)
+    function signContext(Vm vm, uint256 signerPrivateKey, uint256 signaturePrivateKey, uint256[] memory context)
         internal
         pure
         returns (SignedContextV1 memory)
@@ -15,7 +15,7 @@ library SignContextLib {
         SignedContextV1 memory signedContext;
 
         // Store the signer's address in the struct
-        signedContext.signer = vm.addr(privateKey);
+        signedContext.signer = vm.addr(signerPrivateKey);
         signedContext.context = context; // copy the context data into the struct
 
         // Create a digest of the context data
@@ -23,7 +23,7 @@ library SignContextLib {
         bytes32 digest = ECDSA.toEthSignedMessageHash(contextHash);
 
         // Create the signature using the cheatCode 'sign'
-        (uint8 v, bytes32 r, bytes32 s) = vm.sign(privateKey, digest);
+        (uint8 v, bytes32 r, bytes32 s) = vm.sign(signaturePrivateKey, digest);
         signedContext.signature = abi.encodePacked(r, s, v);
 
         return signedContext;