diff --git a/artifacts/contracts/DataTypes.sol/DataTypes.dbg.json b/artifacts/contracts/DataTypes.sol/DataTypes.dbg.json
index 8274933..0176b98 100644
--- a/artifacts/contracts/DataTypes.sol/DataTypes.dbg.json
+++ b/artifacts/contracts/DataTypes.sol/DataTypes.dbg.json
@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "../../build-info/8b1c16bb48b706a49fa1987390ca36fd.json"
+  "buildInfo": "../../build-info/246d885849ebe73a8f97a386ac3822ea.json"
 }
diff --git a/artifacts/contracts/EventAndErrors.sol/EventAndErrors.dbg.json b/artifacts/contracts/EventAndErrors.sol/EventAndErrors.dbg.json
index 8274933..cc833b3 100644
--- a/artifacts/contracts/EventAndErrors.sol/EventAndErrors.dbg.json
+++ b/artifacts/contracts/EventAndErrors.sol/EventAndErrors.dbg.json
@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "../../build-info/8b1c16bb48b706a49fa1987390ca36fd.json"
+  "buildInfo": "../../build-info/10314198dd1b1c93bdb3afe5190d4fa3.json"
 }
diff --git a/artifacts/contracts/EventAndErrors.sol/EventAndErrors.json b/artifacts/contracts/EventAndErrors.sol/EventAndErrors.json
index acbb74f..0679a99 100644
--- a/artifacts/contracts/EventAndErrors.sol/EventAndErrors.json
+++ b/artifacts/contracts/EventAndErrors.sol/EventAndErrors.json
@@ -38,6 +38,11 @@
       "name": "LengthMismatch",
       "type": "error"
     },
+    {
+      "inputs": [],
+      "name": "LockExpired",
+      "type": "error"
+    },
     {
       "inputs": [],
       "name": "LoopOverflow",
diff --git a/artifacts/contracts/Reputation.sol/Reputation.dbg.json b/artifacts/contracts/Reputation.sol/Reputation.dbg.json
index 8274933..0176b98 100644
--- a/artifacts/contracts/Reputation.sol/Reputation.dbg.json
+++ b/artifacts/contracts/Reputation.sol/Reputation.dbg.json
@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "../../build-info/8b1c16bb48b706a49fa1987390ca36fd.json"
+  "buildInfo": "../../build-info/246d885849ebe73a8f97a386ac3822ea.json"
 }
diff --git a/artifacts/contracts/lib/auth/Owned.sol/Owned.dbg.json b/artifacts/contracts/lib/auth/Owned.sol/Owned.dbg.json
index 0ff5a8a..ae137ed 100644
--- a/artifacts/contracts/lib/auth/Owned.sol/Owned.dbg.json
+++ b/artifacts/contracts/lib/auth/Owned.sol/Owned.dbg.json
@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "../../../../build-info/8b1c16bb48b706a49fa1987390ca36fd.json"
+  "buildInfo": "../../../../build-info/246d885849ebe73a8f97a386ac3822ea.json"
 }
diff --git a/artifacts/contracts/lib/interfaces/IReputation.sol/IReputation.dbg.json b/artifacts/contracts/lib/interfaces/IReputation.sol/IReputation.dbg.json
index 0ff5a8a..ae137ed 100644
--- a/artifacts/contracts/lib/interfaces/IReputation.sol/IReputation.dbg.json
+++ b/artifacts/contracts/lib/interfaces/IReputation.sol/IReputation.dbg.json
@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "../../../../build-info/8b1c16bb48b706a49fa1987390ca36fd.json"
+  "buildInfo": "../../../../build-info/246d885849ebe73a8f97a386ac3822ea.json"
 }
diff --git a/artifacts/contracts/lib/mock/mockToken.sol/MockToken.dbg.json b/artifacts/contracts/lib/mock/mockToken.sol/MockToken.dbg.json
index 0ff5a8a..ae137ed 100644
--- a/artifacts/contracts/lib/mock/mockToken.sol/MockToken.dbg.json
+++ b/artifacts/contracts/lib/mock/mockToken.sol/MockToken.dbg.json
@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "../../../../build-info/8b1c16bb48b706a49fa1987390ca36fd.json"
+  "buildInfo": "../../../../build-info/246d885849ebe73a8f97a386ac3822ea.json"
 }
diff --git a/artifacts/contracts/lib/tokens/ERC20.sol/ERC20.dbg.json b/artifacts/contracts/lib/tokens/ERC20.sol/ERC20.dbg.json
index 0ff5a8a..ae137ed 100644
--- a/artifacts/contracts/lib/tokens/ERC20.sol/ERC20.dbg.json
+++ b/artifacts/contracts/lib/tokens/ERC20.sol/ERC20.dbg.json
@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "../../../../build-info/8b1c16bb48b706a49fa1987390ca36fd.json"
+  "buildInfo": "../../../../build-info/246d885849ebe73a8f97a386ac3822ea.json"
 }
diff --git a/artifacts/contracts/lib/utils/Counters.sol/Counters.dbg.json b/artifacts/contracts/lib/utils/Counters.sol/Counters.dbg.json
index 0ff5a8a..ae137ed 100644
--- a/artifacts/contracts/lib/utils/Counters.sol/Counters.dbg.json
+++ b/artifacts/contracts/lib/utils/Counters.sol/Counters.dbg.json
@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "../../../../build-info/8b1c16bb48b706a49fa1987390ca36fd.json"
+  "buildInfo": "../../../../build-info/246d885849ebe73a8f97a386ac3822ea.json"
 }
diff --git a/artifacts/contracts/lib/utils/MerkleProofLib.sol/MerkleProofLib.dbg.json b/artifacts/contracts/lib/utils/MerkleProofLib.sol/MerkleProofLib.dbg.json
index 0ff5a8a..ae137ed 100644
--- a/artifacts/contracts/lib/utils/MerkleProofLib.sol/MerkleProofLib.dbg.json
+++ b/artifacts/contracts/lib/utils/MerkleProofLib.sol/MerkleProofLib.dbg.json
@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "../../../../build-info/8b1c16bb48b706a49fa1987390ca36fd.json"
+  "buildInfo": "../../../../build-info/246d885849ebe73a8f97a386ac3822ea.json"
 }
diff --git a/artifacts/contracts/lib/utils/ReentrancyGuard.sol/ReentrancyGuard.dbg.json b/artifacts/contracts/lib/utils/ReentrancyGuard.sol/ReentrancyGuard.dbg.json
index 0ff5a8a..ae137ed 100644
--- a/artifacts/contracts/lib/utils/ReentrancyGuard.sol/ReentrancyGuard.dbg.json
+++ b/artifacts/contracts/lib/utils/ReentrancyGuard.sol/ReentrancyGuard.dbg.json
@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "../../../../build-info/8b1c16bb48b706a49fa1987390ca36fd.json"
+  "buildInfo": "../../../../build-info/246d885849ebe73a8f97a386ac3822ea.json"
 }
diff --git a/artifacts/contracts/lib/utils/SafeTransferLib.sol/SafeTransferLib.dbg.json b/artifacts/contracts/lib/utils/SafeTransferLib.sol/SafeTransferLib.dbg.json
index 0ff5a8a..ae137ed 100644
--- a/artifacts/contracts/lib/utils/SafeTransferLib.sol/SafeTransferLib.dbg.json
+++ b/artifacts/contracts/lib/utils/SafeTransferLib.sol/SafeTransferLib.dbg.json
@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "../../../../build-info/8b1c16bb48b706a49fa1987390ca36fd.json"
+  "buildInfo": "../../../../build-info/246d885849ebe73a8f97a386ac3822ea.json"
 }
diff --git a/artifacts/contracts/p2pix.sol/P2PIX.dbg.json b/artifacts/contracts/p2pix.sol/P2PIX.dbg.json
index a27cfb1..093f0c0 100644
--- a/artifacts/contracts/p2pix.sol/P2PIX.dbg.json
+++ b/artifacts/contracts/p2pix.sol/P2PIX.dbg.json
@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "../../build-info/43c90b4df62900d52ce9b2809e9d7089.json"
+  "buildInfo": "../../build-info/a7ece494b4784ac2499b0ced3d2c9c0a.json"
 }
diff --git a/artifacts/contracts/p2pix.sol/P2PIX.json b/artifacts/contracts/p2pix.sol/P2PIX.json
index 6e1ec8e..9feb860 100644
--- a/artifacts/contracts/p2pix.sol/P2PIX.json
+++ b/artifacts/contracts/p2pix.sol/P2PIX.json
@@ -69,6 +69,11 @@
       "name": "LengthMismatch",
       "type": "error"
     },
+    {
+      "inputs": [],
+      "name": "LockExpired",
+      "type": "error"
+    },
     {
       "inputs": [],
       "name": "LoopOverflow",
@@ -805,6 +810,25 @@
       "stateMutability": "nonpayable",
       "type": "function"
     },
+    {
+      "inputs": [
+        {
+          "internalType": "bytes32",
+          "name": "",
+          "type": "bytes32"
+        }
+      ],
+      "name": "usedTransactions",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
     {
       "inputs": [
         {
@@ -873,8 +897,8 @@
       "type": "receive"
     }
   ],
-  "bytecode": 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   "linkReferences": {},
   "deployedLinkReferences": {}
 }
diff --git a/contracts/EventAndErrors.sol b/contracts/EventAndErrors.sol
index d64d114..20359c6 100644
--- a/contracts/EventAndErrors.sol
+++ b/contracts/EventAndErrors.sol
@@ -100,4 +100,7 @@ interface EventAndErrors {
     /// @dev Reverts when success return value returns false.
     /// @dev 0xe10bf1cc
     error StaticCallFailed();
+    /// @dev Reverts on an expired lock.
+    /// @dev 0xf6fafba0
+    error LockExpired();
 }
diff --git a/contracts/p2pix.sol b/contracts/p2pix.sol
index 44005bc..40a7790 100644
--- a/contracts/p2pix.sol
+++ b/contracts/p2pix.sol
@@ -46,7 +46,7 @@ contract P2PIX is
     /// @dev List of Locks.
     mapping(bytes32 => DT.Lock) public mapLocks;
     /// @dev List of Pix transactions already signed.
-    mapping(bytes32 => bool) private usedTransactions;
+    mapping(bytes32 => bool) public usedTransactions;
     /// @dev Seller casted to key => Seller's allowlist merkleroot.
     mapping(uint256 => bytes32) public sellerAllowList;
     /// @dev Tokens allowed to serve as the underlying amount of a deposit.
@@ -243,9 +243,12 @@ contract P2PIX is
     ) public nonReentrant {
         DT.Lock storage l = mapLocks[lockID];
 
-        if (
-            l.expirationBlock <= block.number || l.amount <= 0
-        ) revert AlreadyReleased();
+        // if (
+        //     l.expirationBlock <= block.number || l.amount <= 0
+        // ) revert AlreadyReleased();
+        if (l.amount == 0) revert AlreadyReleased();
+        if (l.expirationBlock < block.number)
+            revert LockExpired();
 
         DT.Deposit storage d = mapDeposits[l.depositID];
         bytes32 message = keccak256(
@@ -275,7 +278,8 @@ contract P2PIX is
         ERC20 t = ERC20(d.token);
 
         // We cache values before zeroing them out.
-        uint256 totalAmount = (l.amount - l.relayerPremium);
+        uint256 lockAmount = l.amount;
+        uint256 totalAmount = (lockAmount - l.relayerPremium);
 
         l.amount = 0;
         l.expirationBlock = 0;
@@ -284,11 +288,12 @@ contract P2PIX is
         if (msg.sender != l.relayerAddress) {
             userRecord[_castAddrToKey(msg.sender)] += l
                 .relayerPremium;
-            userRecord[_castAddrToKey(l.relayerAddress)] += l
-                .amount;
+            userRecord[
+                _castAddrToKey(l.relayerAddress)
+            ] += lockAmount;
         } else {
             userRecord[_castAddrToKey(msg.sender)] += (l
-                .relayerPremium + l.amount);
+                .relayerPremium + lockAmount);
         }
 
         SafeTransferLib.safeTransfer(
diff --git a/deploys/localhost.json b/deploys/localhost.json
index 36c432c..ad0c84f 100644
--- a/deploys/localhost.json
+++ b/deploys/localhost.json
@@ -5,4 +5,4 @@
   ],
   "p2pix": "0x37c856F4d5bC2597da60f607b1335738468453F3",
   "token": "0x294003F602c321627152c6b7DED3EAb5bEa853Ee"
-}
\ No newline at end of file
+}
diff --git a/src/types/factories/EventAndErrors__factory.ts b/src/types/factories/EventAndErrors__factory.ts
index a25767b..817b9b2 100644
--- a/src/types/factories/EventAndErrors__factory.ts
+++ b/src/types/factories/EventAndErrors__factory.ts
@@ -45,6 +45,11 @@ const _abi = [
     name: "LengthMismatch",
     type: "error",
   },
+  {
+    inputs: [],
+    name: "LockExpired",
+    type: "error",
+  },
   {
     inputs: [],
     name: "LoopOverflow",
diff --git a/src/types/factories/p2pix.sol/P2PIX__factory.ts b/src/types/factories/p2pix.sol/P2PIX__factory.ts
index b882e19..befa2c1 100644
--- a/src/types/factories/p2pix.sol/P2PIX__factory.ts
+++ b/src/types/factories/p2pix.sol/P2PIX__factory.ts
@@ -80,6 +80,11 @@ const _abi = [
     name: "LengthMismatch",
     type: "error",
   },
+  {
+    inputs: [],
+    name: "LockExpired",
+    type: "error",
+  },
   {
     inputs: [],
     name: "LoopOverflow",
@@ -816,6 +821,25 @@ const _abi = [
     stateMutability: "nonpayable",
     type: "function",
   },
+  {
+    inputs: [
+      {
+        internalType: "bytes32",
+        name: "",
+        type: "bytes32",
+      },
+    ],
+    name: "usedTransactions",
+    outputs: [
+      {
+        internalType: "bool",
+        name: "",
+        type: "bool",
+      },
+    ],
+    stateMutability: "view",
+    type: "function",
+  },
   {
     inputs: [
       {
@@ -886,7 +910,7 @@ const _abi = [
 ];
 
 const _bytecode =
-  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
 type P2PIXConstructorParams =
   | [signer?: Signer]
diff --git a/src/types/p2pix.sol/P2PIX.ts b/src/types/p2pix.sol/P2PIX.ts
index b86b025..5d578fc 100644
--- a/src/types/p2pix.sol/P2PIX.ts
+++ b/src/types/p2pix.sol/P2PIX.ts
@@ -49,6 +49,7 @@ export interface P2PIXInterface extends utils.Interface {
     "setValidSigners(address[])": FunctionFragment;
     "tokenSettings(address[],bool[])": FunctionFragment;
     "unlockExpired(bytes32[])": FunctionFragment;
+    "usedTransactions(bytes32)": FunctionFragment;
     "userRecord(uint256)": FunctionFragment;
     "validBacenSigners(uint256)": FunctionFragment;
     "withdraw(uint256,bytes32[])": FunctionFragment;
@@ -77,6 +78,7 @@ export interface P2PIXInterface extends utils.Interface {
       | "setValidSigners"
       | "tokenSettings"
       | "unlockExpired"
+      | "usedTransactions"
       | "userRecord"
       | "validBacenSigners"
       | "withdraw"
@@ -180,6 +182,10 @@ export interface P2PIXInterface extends utils.Interface {
     functionFragment: "unlockExpired",
     values: [PromiseOrValue<BytesLike>[]]
   ): string;
+  encodeFunctionData(
+    functionFragment: "usedTransactions",
+    values: [PromiseOrValue<BytesLike>]
+  ): string;
   encodeFunctionData(
     functionFragment: "userRecord",
     values: [PromiseOrValue<BigNumberish>]
@@ -253,6 +259,10 @@ export interface P2PIXInterface extends utils.Interface {
     functionFragment: "unlockExpired",
     data: BytesLike
   ): Result;
+  decodeFunctionResult(
+    functionFragment: "usedTransactions",
+    data: BytesLike
+  ): Result;
   decodeFunctionResult(functionFragment: "userRecord", data: BytesLike): Result;
   decodeFunctionResult(
     functionFragment: "validBacenSigners",
@@ -596,6 +606,11 @@ export interface P2PIX extends BaseContract {
       overrides?: Overrides & { from?: PromiseOrValue<string> }
     ): Promise<ContractTransaction>;
 
+    usedTransactions(
+      arg0: PromiseOrValue<BytesLike>,
+      overrides?: CallOverrides
+    ): Promise<[boolean]>;
+
     userRecord(
       arg0: PromiseOrValue<BigNumberish>,
       overrides?: CallOverrides
@@ -739,6 +754,11 @@ export interface P2PIX extends BaseContract {
     overrides?: Overrides & { from?: PromiseOrValue<string> }
   ): Promise<ContractTransaction>;
 
+  usedTransactions(
+    arg0: PromiseOrValue<BytesLike>,
+    overrides?: CallOverrides
+  ): Promise<boolean>;
+
   userRecord(
     arg0: PromiseOrValue<BigNumberish>,
     overrides?: CallOverrides
@@ -882,6 +902,11 @@ export interface P2PIX extends BaseContract {
       overrides?: CallOverrides
     ): Promise<void>;
 
+    usedTransactions(
+      arg0: PromiseOrValue<BytesLike>,
+      overrides?: CallOverrides
+    ): Promise<boolean>;
+
     userRecord(
       arg0: PromiseOrValue<BigNumberish>,
       overrides?: CallOverrides
@@ -1115,6 +1140,11 @@ export interface P2PIX extends BaseContract {
       overrides?: Overrides & { from?: PromiseOrValue<string> }
     ): Promise<BigNumber>;
 
+    usedTransactions(
+      arg0: PromiseOrValue<BytesLike>,
+      overrides?: CallOverrides
+    ): Promise<BigNumber>;
+
     userRecord(
       arg0: PromiseOrValue<BigNumberish>,
       overrides?: CallOverrides
@@ -1241,6 +1271,11 @@ export interface P2PIX extends BaseContract {
       overrides?: Overrides & { from?: PromiseOrValue<string> }
     ): Promise<PopulatedTransaction>;
 
+    usedTransactions(
+      arg0: PromiseOrValue<BytesLike>,
+      overrides?: CallOverrides
+    ): Promise<PopulatedTransaction>;
+
     userRecord(
       arg0: PromiseOrValue<BigNumberish>,
       overrides?: CallOverrides
diff --git a/test/p2pix.test.ts b/test/p2pix.test.ts
index 0e7fede..378e38c 100644
--- a/test/p2pix.test.ts
+++ b/test/p2pix.test.ts
@@ -944,69 +944,345 @@ describe("P2PIX", () => {
       expect(newState3.valid).to.be.false;
     });
   });
-  // describe("Release", async () => {
-  //   // it("should revert if lock has expired or has already been released")
-  //   // it("should revert if signed message has already been used")
-  //   // it("should revert if ecrecovered signer is invalid")
-  //   // // @todo Finish storage and event checks
-  //   // it("should release lock, update storage and emit events", async () => {
-  //   //   const endtoendID = "124";
-  //   //   const pixTarget = "pixTarget";
-  //   //   const messageToSign = ethers.utils.solidityKeccak256(
-  //   //     ["string", "uint256", "uint256"],
-  //   //     [pixTarget, 100, endtoendID],
-  //   //   );
-  //   //   const messageHashBytes =
-  //   //     ethers.utils.arrayify(messageToSign);
-  //   //   const flatSig = await acc01.signMessage(
-  //   //     messageHashBytes,
-  //   //   );
-  //   //   const sig = ethers.utils.splitSignature(flatSig);
-  //   //   const root = ethers.constants.HashZero;
+  describe("Release", async () => {
+    it("should revert if lock has expired", async () => {
+      const messageToSign = ethers.utils.solidityKeccak256(
+        ["string", "uint256", "uint256"],
+        ["pixTarget", 100, "1337"],
+      );
+      const flatSig = await acc01.signMessage(
+        ethers.utils.arrayify(messageToSign),
+      );
+      const sig = ethers.utils.splitSignature(flatSig);
+      await erc20.approve(p2pix.address, price);
+      await p2pix.deposit(
+        erc20.address,
+        price,
+        "pixTarget",
+        merkleRoot,
+      );
+      await p2pix
+        .connect(acc03)
+        .lock(
+          0,
+          acc02.address,
+          acc03.address,
+          6,
+          100,
+          [],
+          [],
+        );
+      const lockID = ethers.utils.solidityKeccak256(
+        ["uint256", "uint256", "address"],
+        [0, 100, acc02.address],
+      );
+      await mine(13);
+      const fail = p2pix.release(
+        lockID,
+        acc03.address,
+        "1337",
+        sig.r,
+        sig.s,
+        sig.v,
+      );
 
-  //   //   await erc20.approve(p2pix.address, price);
-  //   //   await p2pix.deposit(
-  //   //     erc20.address,
-  //   //     price,
-  //   //     pixTarget,
-  //   //     root,
-  //   //   );
-  //   //   await p2pix
-  //   //     .connect(acc01)
-  //   //     .lock(
-  //   //       0,
-  //   //       acc02.address,
-  //   //       acc03.address,
-  //   //       0,
-  //   //       100,
-  //   //       [],
-  //   //       [],
-  //   //     );
-  //   //   const lockID = ethers.utils.solidityKeccak256(
-  //   //     ["uint256", "uint256", "address"],
-  //   //     [0, 100, acc02.address],
-  //   //   );
-  //   //   const storage1: Lock = await p2pix.callStatic.mapLocks(
-  //   //     lockID,
-  //   //   );
-  //   //   const tx = await p2pix
-  //   //     .connect(acc01)
-  //   //     .release(
-  //   //       lockID,
-  //   //       acc03.address,
-  //   //       endtoendID,
-  //   //       sig.r,
-  //   //       sig.s,
-  //   //       sig.v,
-  //   //     );
-  //   // });
-  //   // it("should release multiple locks") - EDGE CASE TEST {
-  //   // TEST 3 CASES (
-  //   // EMPTY PREMIUM,
-  //   // LOCK RELAYER != RELEASE RELAYER, (check userRecord storage update)
-  //   // LOCK RELAYER == RELEASE RELAYER (check userRecord storage update)
-  //   // )}
-  // });
+      await expect(fail).to.be.revertedWithCustomError(
+        p2pix,
+        P2PixErrors.LockExpired,
+      );
+    });
+    it("should revert if lock has already been released", async () => {
+      const messageToSign = ethers.utils.solidityKeccak256(
+        ["string", "uint256", "uint256"],
+        ["pixTarget", 100, "1337"],
+      );
+      const flatSig = await acc01.signMessage(
+        ethers.utils.arrayify(messageToSign),
+      );
+      const sig = ethers.utils.splitSignature(flatSig);
+      await erc20.approve(p2pix.address, price);
+      await p2pix.deposit(
+        erc20.address,
+        price,
+        "pixTarget",
+        merkleRoot,
+      );
+      await p2pix
+        .connect(acc03)
+        .lock(
+          0,
+          acc02.address,
+          acc03.address,
+          6,
+          100,
+          [],
+          [],
+        );
+      const lockID = ethers.utils.solidityKeccak256(
+        ["uint256", "uint256", "address"],
+        [0, 100, acc02.address],
+      );
+      await p2pix.release(
+        lockID,
+        acc03.address,
+        "1337",
+        sig.r,
+        sig.s,
+        sig.v,
+      );
+      const fail = p2pix.release(
+        lockID,
+        acc03.address,
+        "1337",
+        sig.r,
+        sig.s,
+        sig.v,
+      );
+
+      await expect(fail).to.be.revertedWithCustomError(
+        p2pix,
+        P2PixErrors.AlreadyReleased,
+      );
+    });
+    it("should revert if signed message has already been used", async () => {
+      const messageToSign = ethers.utils.solidityKeccak256(
+        ["string", "uint256", "uint256"],
+        ["pixTarget", 100, "1337"],
+      );
+      const flatSig = await owner.signMessage(
+        ethers.utils.arrayify(messageToSign),
+      );
+      const sig = ethers.utils.splitSignature(flatSig);
+      await erc20.approve(p2pix.address, price);
+      await p2pix.deposit(
+        erc20.address,
+        price,
+        "pixTarget",
+        ethers.constants.HashZero,
+      );
+      await p2pix
+        .connect(acc03)
+        .lock(
+          0,
+          acc02.address,
+          acc03.address,
+          6,
+          100,
+          [],
+          [],
+        );
+      const lockID = ethers.utils.solidityKeccak256(
+        ["uint256", "uint256", "address"],
+        [0, 100, acc02.address],
+      );
+      await p2pix
+        .connect(acc01)
+        .release(
+          lockID,
+          acc02.address,
+          "1337",
+          sig.r,
+          sig.s,
+          sig.v,
+        );
+      await p2pix
+        .connect(acc03)
+        .lock(
+          0,
+          acc02.address,
+          acc03.address,
+          6,
+          100,
+          [],
+          [],
+        );
+      const lockID2 = ethers.utils.solidityKeccak256(
+        ["uint256", "uint256", "address"],
+        [0, 100, acc02.address],
+      );
+      const fail = p2pix
+        .connect(acc01)
+        .release(
+          lockID2,
+          acc02.address,
+          "1337",
+          sig.r,
+          sig.s,
+          sig.v,
+        );
+
+      await expect(fail).to.be.revertedWithCustomError(
+        p2pix,
+        P2PixErrors.TxAlreadyUsed,
+      );
+    });
+    it("should revert if ecrecovered signer is invalid", async () => {
+      const messageToSign = ethers.utils.solidityKeccak256(
+        ["string", "uint256", "uint256"],
+        ["pixTarget", 100, "1337"],
+      );
+      const flatSig = await acc03.signMessage(
+        ethers.utils.arrayify(messageToSign),
+      );
+      const sig = ethers.utils.splitSignature(flatSig);
+
+      await erc20.approve(p2pix.address, price);
+      await p2pix.deposit(
+        erc20.address,
+        price,
+        "pixTarget",
+        ethers.constants.HashZero,
+      );
+      await p2pix
+        .connect(acc03)
+        .lock(
+          0,
+          acc02.address,
+          acc03.address,
+          6,
+          100,
+          [],
+          [],
+        );
+      const lockID = ethers.utils.solidityKeccak256(
+        ["uint256", "uint256", "address"],
+        [0, 100, acc02.address],
+      );
+      const fail = p2pix
+        .connect(acc01)
+        .release(
+          lockID,
+          acc02.address,
+          "1337",
+          sig.r,
+          sig.s,
+          sig.v,
+        );
+
+      await expect(fail).to.be.revertedWithCustomError(
+        p2pix,
+        P2PixErrors.InvalidSigner,
+      );
+    });
+    it("should release lock, update storage and emit events", async () => {
+      const endtoendID = "124";
+      const pixTarget = "pixTarget";
+      const messageToSign = ethers.utils.solidityKeccak256(
+        ["string", "uint256", "uint256"],
+        [pixTarget, 100, endtoendID],
+      );
+      // Note: messageToSign is a string, that is 66-bytes long, to sign the
+      //       binary value, we must convert it to the 32 byte Array that
+      //       the string represents
+      //
+      // i.e.,
+      //    66-byte string
+      //   "0x592fa743889fc7f92ac2a37bb1f5ba1daf2a5c84741ca0e0061d243a2e6707ba"
+      //   ... vs ...
+      //   32 entry Uint8Array
+      //  [ 89, 47, 167, 67, 136, 159, ... 103, 7, 186]
+      const messageHashBytes =
+        ethers.utils.arrayify(messageToSign);
+      const flatSig = await acc01.signMessage(
+        messageHashBytes,
+      );
+      const sig = ethers.utils.splitSignature(flatSig);
+      const root = ethers.constants.HashZero;
+
+      await erc20.approve(p2pix.address, price);
+      await p2pix.deposit(
+        erc20.address,
+        price,
+        pixTarget,
+        root,
+      );
+      await p2pix
+        .connect(acc03)
+        .lock(
+          0,
+          acc02.address,
+          acc03.address,
+          6,
+          100,
+          [],
+          [],
+        );
+      const lockID = ethers.utils.solidityKeccak256(
+        ["uint256", "uint256", "address"],
+        [0, 100, acc02.address],
+      );
+      const acc01Key = await p2pix.callStatic._castAddrToKey(
+        acc01.address,
+      );
+      const acc03Key = await p2pix.callStatic._castAddrToKey(
+        acc03.address,
+      );
+      const userRecordA = await p2pix.callStatic.userRecord(
+        acc01Key,
+      );
+      const userRecord1 = await p2pix.callStatic.userRecord(
+        acc03Key,
+      );
+      const storage1: Lock = await p2pix.callStatic.mapLocks(
+        lockID,
+      );
+      const tx = await p2pix
+        .connect(acc01)
+        .release(
+          lockID,
+          acc02.address,
+          endtoendID,
+          sig.r,
+          sig.s,
+          sig.v,
+        );
+      const storage2: Lock = await p2pix.callStatic.mapLocks(
+        lockID,
+      );
+      const userRecordB = await p2pix.callStatic.userRecord(
+        acc01Key,
+      );
+      const userRecord2 = await p2pix.callStatic.userRecord(
+        acc03Key,
+      );
+      const used = await p2pix.callStatic.usedTransactions(
+        messageHashBytes,
+      );
+      expect(tx).to.be.ok;
+      await expect(tx)
+        .to.emit(p2pix, "LockReleased")
+        .withArgs(acc02.address, lockID);
+      expect(storage1.expirationBlock).to.eq(
+        ethers.BigNumber.from(16),
+      );
+      expect(storage1.amount).to.eq(
+        ethers.BigNumber.from(100),
+      );
+      expect(storage2.expirationBlock).to.eq(
+        ethers.BigNumber.from(0),
+      );
+      expect(storage2.amount).to.eq(ethers.BigNumber.from(0));
+      expect(used).to.eq(true);
+      expect(userRecordA).to.eq(ethers.constants.Zero);
+      expect(userRecord1).to.eq(ethers.constants.Zero);
+      expect(userRecordB).to.eq(ethers.BigNumber.from(6));
+      expect(userRecord2).to.eq(ethers.BigNumber.from(100));
+      await expect(tx).to.changeTokenBalances(
+        erc20,
+        [acc03.address, acc02.address],
+        [3, 97],
+        // acc02 is acting both as buyer and relayerTarget
+        // (i.e., 94 + 3 = 97)
+      );
+    });
+    /// @todo
+    // it("should release multiple locks") - EDGE CASE TEST {
+    // TEST 3 CASES (
+    // EMPTY PREMIUM,
+    // LOCK RELAYER != RELEASE RELAYER, (check userRecord storage update)
+    // LOCK RELAYER == RELEASE RELAYER (check userRecord storage update)
+    // )}
+  });
   describe("Unexpire Locks", async () => {
     it("should revert if lock isn't expired", async () => {
       await erc20.approve(p2pix.address, price);
@@ -1059,8 +1335,8 @@ describe("P2PIX", () => {
       );
       // await mine(10);
       await p2pix.release(
-        lockID, 
-        acc03.address, 
+        lockID,
+        acc03.address,
         endtoendID,
         sig.r,
         sig.s,
@@ -1281,7 +1557,7 @@ describe("P2PIX", () => {
     });
   });
   describe("Allowlist Settings", async () => {
-    it(" should revert if the msg.sender differs from deposit's seller", async () => {
+    it("should revert if the msg.sender differs from deposit's seller", async () => {
       const root = ethers.utils.keccak256(
         ethers.utils.toUtf8Bytes("root"),
       );
diff --git a/test/utils/errors.ts b/test/utils/errors.ts
index d064218..111ff6f 100644
--- a/test/utils/errors.ts
+++ b/test/utils/errors.ts
@@ -14,4 +14,5 @@ export enum P2PixErrors {
   LengthMismatch = "LengthMismatch",
   AddressDenied = "AddressDenied",
   AmountNotAllowed = "AmountNotAllowed",
+  LockExpired = "LockExpired",
 }