diff --git a/README.md b/README.md
index e4f6d67..fa83f12 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,7 @@
 
 ```rs
 ./contracts/
+├── Constants.sol
 ├── DataTypes.sol
 ├── EventAndErrors.sol
 ├── lib
@@ -18,6 +19,7 @@
 │   ├── tokens
 │   │   └── ERC20.sol
 │   └── utils
+│       ├── ECDSA.sol
 │       ├── MerkleProofLib.sol
 │       ├── Multicall.sol
 │       ├── ReentrancyGuard.sol
diff --git a/artifacts/contracts/Constants.sol/Constants.dbg.json b/artifacts/contracts/Constants.sol/Constants.dbg.json
new file mode 100644
index 0000000..2344260
--- /dev/null
+++ b/artifacts/contracts/Constants.sol/Constants.dbg.json
@@ -0,0 +1,4 @@
+{
+  "_format": "hh-sol-dbg-1",
+  "buildInfo": "../../build-info/249d92249de0943da88155e04b92fb7f.json"
+}
diff --git a/artifacts/contracts/Constants.sol/Constants.json b/artifacts/contracts/Constants.sol/Constants.json
new file mode 100644
index 0000000..07eaf6a
--- /dev/null
+++ b/artifacts/contracts/Constants.sol/Constants.json
@@ -0,0 +1,10 @@
+{
+  "_format": "hh-sol-artifact-1",
+  "contractName": "Constants",
+  "sourceName": "contracts/Constants.sol",
+  "abi": [],
+  "bytecode": "0x",
+  "deployedBytecode": "0x",
+  "linkReferences": {},
+  "deployedLinkReferences": {}
+}
diff --git a/artifacts/contracts/DataTypes.sol/DataTypes.dbg.json b/artifacts/contracts/DataTypes.sol/DataTypes.dbg.json
index c23cd42..a349655 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/cec3ec245aa8292dcd32990ec72987ab.json"
+  "buildInfo": "../../build-info/3511ccc4f632d4fc1741b59d8fb89855.json"
 }
diff --git a/artifacts/contracts/DataTypes.sol/DataTypes.json b/artifacts/contracts/DataTypes.sol/DataTypes.json
index c836aa1..3639b3f 100644
--- a/artifacts/contracts/DataTypes.sol/DataTypes.json
+++ b/artifacts/contracts/DataTypes.sol/DataTypes.json
@@ -3,8 +3,8 @@
   "contractName": "DataTypes",
   "sourceName": "contracts/DataTypes.sol",
   "abi": [],
-  "bytecode": "0x60808060405234601757603a9081601d823930815050f35b600080fdfe600080fdfea26469706673582212206adb3dae064942e78abcd2b6adb116d65e8b719b79e9f02514e62a1b01f8a03b64736f6c63430008130033",
-  "deployedBytecode": "0x600080fdfea26469706673582212206adb3dae064942e78abcd2b6adb116d65e8b719b79e9f02514e62a1b01f8a03b64736f6c63430008130033",
+  "bytecode": "0x60808060405234601757603a9081601d823930815050f35b600080fdfe600080fdfea2646970667358221220e2b83942b5818cc4f73c29200b41672c082782c77a5936ed5de9e316913cd2d264736f6c63430008130033",
+  "deployedBytecode": "0x600080fdfea2646970667358221220e2b83942b5818cc4f73c29200b41672c082782c77a5936ed5de9e316913cd2d264736f6c63430008130033",
   "linkReferences": {},
   "deployedLinkReferences": {}
 }
diff --git a/artifacts/contracts/EventAndErrors.sol/EventAndErrors.dbg.json b/artifacts/contracts/EventAndErrors.sol/EventAndErrors.dbg.json
index c23cd42..af16c51 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/cec3ec245aa8292dcd32990ec72987ab.json"
+  "buildInfo": "../../build-info/6c3e670658cfbeb3de636ecbaa8ad53a.json"
 }
diff --git a/artifacts/contracts/Reputation.sol/Reputation.dbg.json b/artifacts/contracts/Reputation.sol/Reputation.dbg.json
index 245da94..af16c51 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/906fc0dd8b27e18481e135d1f328d0ae.json"
+  "buildInfo": "../../build-info/6c3e670658cfbeb3de636ecbaa8ad53a.json"
 }
diff --git a/artifacts/contracts/lib/auth/Owned.sol/Owned.dbg.json b/artifacts/contracts/lib/auth/Owned.sol/Owned.dbg.json
index b512f4d..77f4404 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/b608b6eb28957aeb71328924500ce935.json"
+  "buildInfo": "../../../../build-info/6c3e670658cfbeb3de636ecbaa8ad53a.json"
 }
diff --git a/artifacts/contracts/lib/interfaces/IReputation.sol/IReputation.dbg.json b/artifacts/contracts/lib/interfaces/IReputation.sol/IReputation.dbg.json
index ca3d07f..77f4404 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/cec3ec245aa8292dcd32990ec72987ab.json"
+  "buildInfo": "../../../../build-info/6c3e670658cfbeb3de636ecbaa8ad53a.json"
 }
diff --git a/artifacts/contracts/lib/mock/mockToken.sol/MockToken.dbg.json b/artifacts/contracts/lib/mock/mockToken.sol/MockToken.dbg.json
index ca3d07f..77f4404 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/cec3ec245aa8292dcd32990ec72987ab.json"
+  "buildInfo": "../../../../build-info/6c3e670658cfbeb3de636ecbaa8ad53a.json"
 }
diff --git a/artifacts/contracts/lib/tokens/ERC20.sol/ERC20.dbg.json b/artifacts/contracts/lib/tokens/ERC20.sol/ERC20.dbg.json
index ca3d07f..77f4404 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/cec3ec245aa8292dcd32990ec72987ab.json"
+  "buildInfo": "../../../../build-info/6c3e670658cfbeb3de636ecbaa8ad53a.json"
 }
diff --git a/artifacts/contracts/lib/utils/ECDSA.sol/ECDSA.dbg.json b/artifacts/contracts/lib/utils/ECDSA.sol/ECDSA.dbg.json
new file mode 100644
index 0000000..e949d99
--- /dev/null
+++ b/artifacts/contracts/lib/utils/ECDSA.sol/ECDSA.dbg.json
@@ -0,0 +1,4 @@
+{
+  "_format": "hh-sol-dbg-1",
+  "buildInfo": "../../../../build-info/7e64ed907e656944d305af383d70ed0c.json"
+}
diff --git a/artifacts/contracts/lib/utils/ECDSA.sol/ECDSA.json b/artifacts/contracts/lib/utils/ECDSA.sol/ECDSA.json
new file mode 100644
index 0000000..f17ddfb
--- /dev/null
+++ b/artifacts/contracts/lib/utils/ECDSA.sol/ECDSA.json
@@ -0,0 +1,16 @@
+{
+  "_format": "hh-sol-artifact-1",
+  "contractName": "ECDSA",
+  "sourceName": "contracts/lib/utils/ECDSA.sol",
+  "abi": [
+    {
+      "inputs": [],
+      "name": "InvalidSignature",
+      "type": "error"
+    }
+  ],
+  "bytecode": "0x60808060405234601757603a9081601d823930815050f35b600080fdfe600080fdfea26469706673582212201f6fe8a460e1235bb7e19365d8e3cc56b718d44f5db82f5fa3c90d3c7da59ebf64736f6c63430008130033",
+  "deployedBytecode": "0x600080fdfea26469706673582212201f6fe8a460e1235bb7e19365d8e3cc56b718d44f5db82f5fa3c90d3c7da59ebf64736f6c63430008130033",
+  "linkReferences": {},
+  "deployedLinkReferences": {}
+}
diff --git a/artifacts/contracts/lib/utils/MerkleProofLib.sol/MerkleProofLib.dbg.json b/artifacts/contracts/lib/utils/MerkleProofLib.sol/MerkleProofLib.dbg.json
index ca3d07f..77f4404 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/cec3ec245aa8292dcd32990ec72987ab.json"
+  "buildInfo": "../../../../build-info/6c3e670658cfbeb3de636ecbaa8ad53a.json"
 }
diff --git a/artifacts/contracts/lib/utils/Multicall.sol/Multicall.dbg.json b/artifacts/contracts/lib/utils/Multicall.sol/Multicall.dbg.json
index ca3d07f..77f4404 100644
--- a/artifacts/contracts/lib/utils/Multicall.sol/Multicall.dbg.json
+++ b/artifacts/contracts/lib/utils/Multicall.sol/Multicall.dbg.json
@@ -1,4 +1,4 @@
 {
   "_format": "hh-sol-dbg-1",
-  "buildInfo": "../../../../build-info/cec3ec245aa8292dcd32990ec72987ab.json"
+  "buildInfo": "../../../../build-info/6c3e670658cfbeb3de636ecbaa8ad53a.json"
 }
diff --git a/artifacts/contracts/lib/utils/ReentrancyGuard.sol/ReentrancyGuard.dbg.json b/artifacts/contracts/lib/utils/ReentrancyGuard.sol/ReentrancyGuard.dbg.json
index ca3d07f..77f4404 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/cec3ec245aa8292dcd32990ec72987ab.json"
+  "buildInfo": "../../../../build-info/6c3e670658cfbeb3de636ecbaa8ad53a.json"
 }
diff --git a/artifacts/contracts/lib/utils/SafeTransferLib.sol/SafeTransferLib.dbg.json b/artifacts/contracts/lib/utils/SafeTransferLib.sol/SafeTransferLib.dbg.json
index ca3d07f..77f4404 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/cec3ec245aa8292dcd32990ec72987ab.json"
+  "buildInfo": "../../../../build-info/6c3e670658cfbeb3de636ecbaa8ad53a.json"
 }
diff --git a/artifacts/contracts/p2pix.sol/P2PIX.dbg.json b/artifacts/contracts/p2pix.sol/P2PIX.dbg.json
index 9a2b475..2344260 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/b608b6eb28957aeb71328924500ce935.json"
+  "buildInfo": "../../build-info/249d92249de0943da88155e04b92fb7f.json"
 }
diff --git a/artifacts/contracts/p2pix.sol/P2PIX.json b/artifacts/contracts/p2pix.sol/P2PIX.json
index 4c03cde..134c423 100644
--- a/artifacts/contracts/p2pix.sol/P2PIX.json
+++ b/artifacts/contracts/p2pix.sol/P2PIX.json
@@ -404,19 +404,6 @@
       "name": "ValidSignersUpdated",
       "type": "event"
     },
-    {
-      "inputs": [],
-      "name": "WAD",
-      "outputs": [
-        {
-          "internalType": "uint256",
-          "name": "",
-          "type": "uint256"
-        }
-      ],
-      "stateMutability": "view",
-      "type": "function"
-    },
     {
       "inputs": [
         {
@@ -658,14 +645,14 @@
           "type": "address"
         },
         {
-          "internalType": "uint256",
+          "internalType": "uint80",
           "name": "_relayerPremium",
-          "type": "uint256"
+          "type": "uint80"
         },
         {
-          "internalType": "uint256",
+          "internalType": "uint80",
           "name": "_amount",
-          "type": "uint256"
+          "type": "uint80"
         },
         {
           "internalType": "bytes32[]",
@@ -682,7 +669,7 @@
       "outputs": [
         {
           "internalType": "uint256",
-          "name": "",
+          "name": "lockID",
           "type": "uint256"
         }
       ],
@@ -722,16 +709,6 @@
           "name": "counter",
           "type": "uint256"
         },
-        {
-          "internalType": "uint256",
-          "name": "relayerPremium",
-          "type": "uint256"
-        },
-        {
-          "internalType": "uint256",
-          "name": "amount",
-          "type": "uint256"
-        },
         {
           "internalType": "uint256",
           "name": "expirationBlock",
@@ -742,6 +719,16 @@
           "name": "pixTarget",
           "type": "uint160"
         },
+        {
+          "internalType": "uint80",
+          "name": "relayerPremium",
+          "type": "uint80"
+        },
+        {
+          "internalType": "uint80",
+          "name": "amount",
+          "type": "uint80"
+        },
         {
           "internalType": "address",
           "name": "buyerAddress",
@@ -1074,8 +1061,8 @@
       "type": "receive"
     }
   ],
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   "linkReferences": {},
   "deployedLinkReferences": {}
 }
diff --git a/contracts/Constants.sol b/contracts/Constants.sol
new file mode 100644
index 0000000..85759f4
--- /dev/null
+++ b/contracts/Constants.sol
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.19;
+
+abstract contract Constants {
+    /// ███ Constants ██████████████████████████████████████████████████████████
+
+    uint256 constant _ROOT_UPDATED_EVENT_SIGNATURE =
+        0x0b294da292f26e55fd442b5c0164fbb9013036ff00c5cfdde0efd01c1baaf632;
+    uint256 constant _ALLOWED_ERC20_UPDATED_EVENT_SIGNATURE =
+        0x5d6e86e5341d57a92c49934296c51542a25015c9b1782a1c2722a940131c3d9a;
+
+    /// @dev Seller casted to key => Seller's allowlist merkleroot.
+    /// mapping(uint256 => bytes32) public sellerAllowList;
+    uint256 constant _SELLER_ALLOWLIST_SLOT_SEED = 0x74dfee70;
+    /// @dev Tokens allowed to serve as the underlying amount of a deposit.
+    /// mapping(ERC20 => bool) public allowedERC20s;
+    uint256 constant _ALLOWED_ERC20_SLOT_SEED = 0xcbc9d1c4;
+
+    /// @dev `balance` max. value = 10**26.
+    /// @dev `pixTarget` keys are restricted to 160 bits.
+    ///     mapping(uint256 => mapping(ERC20 => uint256)) public sellerBalance;
+
+    /// @dev Bits layout:
+    /// `uint96`  [0...94]   := balance
+    /// `uint160` [95...254] := pixTarget
+    /// `bool`    [255]       := valid
+
+    /// @dev Value in custom storage slot given by:
+    ///     mstore(0x20, token)
+    ///     mstore(0x0c, _SELLER_BALANCE_SLOT_SEED)
+    ///     mstore(0x00, seller)
+    ///     let value := sload(keccak256(0x0c, 0x34)).
+    uint256 constant _SELLER_BALANCE_SLOT_SEED = 0x739094b1;
+
+    /// @dev The bitmask of `sellerBalance` entry.
+    uint256 constant BITMASK_SB_ENTRY = (1 << 94) - 1;
+    /// @dev The bit position of `pixTarget` in `sellerBalance`.
+    uint256 constant BITPOS_PIXTARGET = 95;
+    /// @dev The bit position of `valid` in `sellerBalance`.
+    uint256 constant BITPOS_VALID = 255;
+    /// @dev The bitmask of all 256 bits of `sellerBalance` except for the last one.
+    uint256 constant BITMASK_VALID = (1 << 255) - 1;
+
+    /// @dev The scalar of BRZ token.
+    uint256 constant WAD = 1e18;
+    uint256 constant MAXBALANCE_UPPERBOUND = 1e8 ether;
+    uint256 constant REPUTATION_LOWERBOUND = 1e2 ether;
+    uint256 constant LOCKAMOUNT_UPPERBOUND = 1e6 ether;
+}
diff --git a/contracts/DataTypes.sol b/contracts/DataTypes.sol
index 64aee3b..564fb48 100644
--- a/contracts/DataTypes.sol
+++ b/contracts/DataTypes.sol
@@ -5,14 +5,14 @@ library DataTypes {
     struct Lock {
         uint256 sellerKey;
         uint256 counter;
-        /// @dev Amount to be paid for relayer.
-        uint256 relayerPremium;
-        /// @dev Amount to be tranfered via PIX.
-        uint256 amount;
         /// @dev If not paid at this block will be expired.
         uint256 expirationBlock;
         uint160 pixTarget;
+        /// @dev Amount to be paid for relayer.
+        uint80 relayerPremium;
         /// @dev Where the tokens are sent the when order gets validated.
+        /// @dev Amount to be tranfered via PIX.
+        uint80 amount;
         address buyerAddress;
         /// @dev Relayer address (msg.sender) that facilitated this transaction.
         /// @dev Relayer's target address that receives `relayerPremium` funds.
diff --git a/contracts/lib/utils/ECDSA.sol b/contracts/lib/utils/ECDSA.sol
new file mode 100644
index 0000000..b2c8ad6
--- /dev/null
+++ b/contracts/lib/utils/ECDSA.sol
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: MIT
+pragma solidity >=0.8.4;
+
+/// @notice Gas optimized ECDSA wrapper.
+/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/ECDSA.sol)
+/// @author Modified from Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/ECDSA.sol)
+/// @author Modified from OpenZeppelin (https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/cryptography/ECDSA.sol)
+library ECDSA {
+    /// @dev The signature is invalid.
+    error InvalidSignature();
+
+    /// @dev The number which `s` must not exceed in order for
+    /// the signature to be non-malleable.
+    bytes32 private constant _MALLEABILITY_THRESHOLD =
+        0x7fffffffffffffffffffffffffffffff5d576e7357a4501ddfe92f46681b20a0;
+
+    /// @dev Recovers the signer's address from a message digest `hash`,
+    /// and the signature defined by `v`, `r`, `s`.
+    function recover(
+        bytes32 hash,
+        uint8 v,
+        bytes32 r,
+        bytes32 s
+    ) internal view returns (address result) {
+        /// @solidity memory-safe-assembly
+        assembly {
+            // Copy the free memory pointer so that we can restore it later.
+            let m := mload(0x40)
+            mstore(0x00, hash)
+            mstore(0x20, and(v, 0xff))
+            mstore(0x40, r)
+            mstore(0x60, s)
+            pop(
+                staticcall(
+                    gas(), // Amount of gas left for the transaction.
+                    // If `s` in lower half order, such that the signature is not malleable.
+                    lt(s, add(_MALLEABILITY_THRESHOLD, 1)), // Address of `ecrecover`.
+                    0x00, // Start of input.
+                    0x80, // Size of input.
+                    0x00, // Start of output.
+                    0x20 // Size of output.
+                )
+            )
+            result := mload(0x00)
+            // `returndatasize()` will be `0x20` upon success, and `0x00` otherwise.
+            if iszero(returndatasize()) {
+                // Store the function selector of `InvalidSignature()`.
+                mstore(0x00, 0x8baa579f)
+                // Revert with (offset, size).
+                revert(0x1c, 0x04)
+            }
+            // Restore the zero slot.
+            mstore(0x60, 0)
+            // Restore the free memory pointer.
+            mstore(0x40, m)
+        }
+    }
+
+    /// @dev Returns an Ethereum Signed Message, created from a `hash`.
+    /// This produces a hash corresponding to the one signed with the
+    /// [`eth_sign`](https://eth.wiki/json-rpc/API#eth_sign)
+    /// JSON-RPC method as part of EIP-191.
+    function toEthSignedMessageHash(
+        bytes32 hash
+    ) internal pure returns (bytes32 result) {
+        /// @solidity memory-safe-assembly
+        assembly {
+            // Store into scratch space for keccak256.
+            mstore(0x20, hash)
+            mstore(
+                0x00,
+                "\x00\x00\x00\x00\x19Ethereum Signed Message:\n32"
+            )
+            // 0x40 - 0x04 = 0x3c
+            result := keccak256(0x04, 0x3c)
+        }
+    }
+}
diff --git a/contracts/p2pix.sol b/contracts/p2pix.sol
index 01dc35a..ddc487c 100644
--- a/contracts/p2pix.sol
+++ b/contracts/p2pix.sol
@@ -12,11 +12,15 @@ import { Owned } from "./lib/auth/Owned.sol";
 import { ERC20, SafeTransferLib } from "./lib/utils/SafeTransferLib.sol";
 import { IReputation } from "./lib/interfaces/IReputation.sol";
 import { MerkleProofLib as Merkle } from "./lib/utils/MerkleProofLib.sol";
+import { ECDSA } from "./lib/utils/ECDSA.sol";
 import { ReentrancyGuard } from "./lib/utils/ReentrancyGuard.sol";
 import { EventAndErrors } from "./EventAndErrors.sol";
 import { DataTypes as DT } from "./DataTypes.sol";
+import { Constants } from "./Constants.sol";
+
 
 contract P2PIX is
+    Constants,
     EventAndErrors,
     Owned(msg.sender),
     ReentrancyGuard
@@ -28,53 +32,17 @@ contract P2PIX is
     using DT for DT.Lock;
     using DT for DT.LockStatus;
 
-    /// ███ Constants ██████████████████████████████████████████████████████████
-
-    uint256 private constant _ROOT_UPDATED_EVENT_SIGNATURE =
-        0x0b294da292f26e55fd442b5c0164fbb9013036ff00c5cfdde0efd01c1baaf632;
-    uint256 private constant _ALLOWED_ERC20_UPDATED_EVENT_SIGNATURE =
-        0x5d6e86e5341d57a92c49934296c51542a25015c9b1782a1c2722a940131c3d9a;
-
-    /// @dev Seller casted to key => Seller's allowlist merkleroot.
-    /// mapping(uint256 => bytes32) public sellerAllowList;
-    uint256 private constant _SELLER_ALLOWLIST_SLOT_SEED = 0x74dfee70;
-    /// @dev Tokens allowed to serve as the underlying amount of a deposit.
-    /// mapping(ERC20 => bool) public allowedERC20s;
-    uint256 private constant _ALLOWED_ERC20_SLOT_SEED = 0xcbc9d1c4;
-
-    // BITS LAYOUT
-    // `uint96`  [0...94]   := balance
-    // `uint160` [95...254] := pixTarget
-    // `bool`    [255]       := valid
-
-    /// @dev `balance` max. value = 10**26.
-    /// @dev `pixTarget` keys are restricted to 160 bits.
-    // mapping(uint256 => mapping(ERC20 => uint256)) public sellerBalance;
-    uint256 private constant _SELLER_BALANCE_SLOT_SEED = 0x739094b1;
-
-    /// @dev The bitmask of `sellerBalance` entry.
-    uint256 private constant BITMASK_SB_ENTRY = (1 << 94) - 1;
-    /// @dev The bit position of `pixTarget` in `sellerBalance`.
-    uint256 private constant BITPOS_PIXTARGET = 95;
-    /// @dev The bit position of `valid` in `sellerBalance`.
-    uint256 private constant BITPOS_VALID = 255;
-    /// @dev The bitmask of all 256 bits of `sellerBalance` except for the last one.
-    uint256 private constant BITMASK_VALID = (1 << 255) - 1;
-    
-    /// @dev The scalar of BRZ token.
-    uint256 public constant WAD = 1e18;
-
     /// ███ Storage ████████████████████████████████████████████████████████████
 
     /// @dev List of valid Bacen signature addresses
+    ///     mapping(uint256 => bool) public validBacenSigners;
     /// @dev Value in custom storage slot given by: 
-    /// let slot := sload(shl(12, address)).
-    // mapping(uint256 => bool) public validBacenSigners;
+    ///     let value := sload(shl(12, address)).
     
     /// @dev List of Pix transactions already signed.
+    ///     mapping(bytes32 => bool) public usedTransactions;
     /// @dev Value in custom storage slot given by: 
-    /// let slot := sload(bytes32).
-    // mapping(bytes32 => bool) public usedTransactions;
+    ///     let value := sload(bytes32).
 
     IReputation public reputation;
 
@@ -126,7 +94,7 @@ contract P2PIX is
         uint256 _sellerBalance = sellerBalance(k,t);
 
         uint256 currBal = _sellerBalance & BITMASK_SB_ENTRY;
-        if ((currBal + _amount) > 1e8 ether)
+        if ((currBal + _amount) > MAXBALANCE_UPPERBOUND)
             revert MaxBalExceeded();
 
         setReentrancyGuard();
@@ -210,12 +178,11 @@ contract P2PIX is
         address _seller,
         address _token,
         address _buyerAddress,
-        // address _relayerTarget,
-        uint256 _relayerPremium,
-        uint256 _amount,
+        uint80 _relayerPremium,
+        uint80 _amount,
         bytes32[] calldata merkleProof,
         uint256[] calldata expiredLocks
-    ) public nonReentrant returns (uint256) {
+    ) public nonReentrant returns (uint256 lockID) {
         unlockExpired(expiredLocks);
 
         ERC20 t = ERC20(_token);
@@ -235,58 +202,32 @@ contract P2PIX is
         DT.Lock memory l = DT.Lock(
             k,
             cCounter,
-            _relayerPremium,
-            _amount,
             (block.number + defaultLockBlocks),
             uint160(sellerBalance(k, t) >> BITPOS_PIXTARGET),
+            _relayerPremium,
+            _amount,
             _buyerAddress,
-            // _relayerTarget,
             msg.sender,
             address(t)
         );
 
         if (merkleProof.length != 0) {
-            _merkleVerify(
-                merkleProof,
-                sellerAllowList(k),
-                msg.sender
-            );
+            _merkleVerify( merkleProof, sellerAllowList(k), msg.sender);
+            lockID = _addLock(bal, _amount, cCounter, l, t, k);
 
-            _addLock(bal, _amount, cCounter, l, t, k);
-
-            lockCounter++;
-
-            // Halt execution and output `lockID`.
-            return cCounter;
         } else {
-            if (l.amount <= 1e2 ether) {
-                _addLock(bal, _amount, cCounter, l, t, k);
+            if (l.amount <= REPUTATION_LOWERBOUND) {
+            lockID = _addLock(bal, _amount, cCounter, l, t, k);
 
-                lockCounter++;
+        } else {
+            uint256 userCredit = userRecord[_castAddrToKey(msg.sender)];
+            uint256 spendLimit; (spendLimit) = _limiter(userCredit / WAD);
+            if ( 
+                l.amount > (spendLimit * WAD) || l.amount > LOCKAMOUNT_UPPERBOUND 
+            ) revert AmountNotAllowed();
+            lockID = _addLock(bal, _amount, cCounter, l, t, k);
 
-                // Halt execution and output `lockID`.
-                return cCounter;
-            } else {
-                uint256 userCredit = userRecord[
-                    _castAddrToKey(msg.sender)
-                ];
-
-                uint256 spendLimit;
-                (spendLimit) = _limiter(userCredit / WAD);
-
-                if (
-                    l.amount > (spendLimit * WAD) ||
-                    l.amount > 1e6 ether
-                ) revert AmountNotAllowed();
-
-                _addLock(bal, _amount, cCounter, l, t, k);
-
-                lockCounter++;
-
-                // Halt execution and output `lockID`.
-                return cCounter;
-            }
-        }
+        /*  */}/*  */}
     }
 
     /// @notice Lock release method that liquidate lock
@@ -294,7 +235,7 @@ contract P2PIX is
     /// @dev This method can be called by any public actor
     /// as long the signature provided is valid.
     /// @dev `relayerPremium` gets splitted equaly
-    /// if `relayerTarget` addresses differ.
+    /// if relayer addresses differ.
     /// @dev If the `msg.sender` of this method and `l.relayerAddress` are the same,
     /// `msg.sender` accrues both l.amount and l.relayerPremium as userRecord credit.
     ///  In case of they differing:
@@ -303,7 +244,6 @@ contract P2PIX is
     /// @dev Function sighash: 0x4e1389ed.
     function release(
         uint256 lockID,
-        // address _relayerTarget,
         bytes32 pixTimestamp,
         bytes32 r,
         bytes32 s,
@@ -322,22 +262,13 @@ contract P2PIX is
                 pixTimestamp
             )
         );
-        bytes32 messageDigest = keccak256(
-            abi.encodePacked(
-                "\x19Ethereum Signed Message:\n32",
-                message
-            )
-        );
 
-        if (usedTransactions(message) == true)
-            revert TxAlreadyUsed();
+        if (usedTransactions(message)) revert TxAlreadyUsed();
 
-        uint256 signer = _castAddrToKey(
-            ecrecover(messageDigest, v, r, s)
-        );
-
-        if (!validBacenSigners(signer))
-            revert InvalidSigner();
+        if (!validBacenSigners(_castAddrToKey(
+            ECDSA.recover(
+                ECDSA.toEthSignedMessageHash(message), v, r, s)
+        ))) revert InvalidSigner();
 
         ERC20 t = ERC20(l.token);
 
@@ -410,7 +341,7 @@ contract P2PIX is
 
             uint256 _sellerBalance = sellerBalance(l.sellerKey, ERC20(l.token)) & BITMASK_SB_ENTRY;
 
-            if ((_sellerBalance + l.amount) > 1e8 ether)
+            if ((_sellerBalance + l.amount) > MAXBALANCE_UPPERBOUND)
                 revert MaxBalExceeded();
 
             _addSellerBalance(l.sellerKey, ERC20(l.token), l.amount);
@@ -423,8 +354,8 @@ contract P2PIX is
             uint256 _newUserRecord = (userRecord[userKey] >>
                 1);
 
-            if (_newUserRecord <= 1e2 ether) {
-                userRecord[userKey] = 1e2 ether;
+            if (_newUserRecord <= REPUTATION_LOWERBOUND) {
+                userRecord[userKey] = REPUTATION_LOWERBOUND;
             } else {
                 userRecord[userKey] = _newUserRecord;
             }
@@ -455,9 +386,8 @@ contract P2PIX is
     ) public nonReentrant {
         unlockExpired(expiredLocks);
 
-        if (getValid(msg.sender, token) == true) {
+        if (getValid(msg.sender, token))
             setValidState(token, false);
-        }
 
         uint256 key = _castAddrToKey(msg.sender);
         _decBal(
@@ -623,10 +553,12 @@ contract P2PIX is
         DT.Lock memory _l,
         ERC20 _t,
         uint256 _k
-    ) internal {
+    ) internal returns(uint256 counter){
         mapLocks[_lockID] = _l;
 
         _decBal(_bal, _amount, _t, _k);
+        lockCounter++;
+        counter = _lockID;
 
         emit LockAdded(
             _l.buyerAddress,
@@ -655,16 +587,11 @@ contract P2PIX is
         view
         returns (uint256 _spendLimit)
     {
-        // enconde the fx sighash and args
         bytes memory encodedParams = abi.encodeWithSelector(
             IReputation.limiter.selector,
             _userCredit
         );
-        // cast the uninitialized return values to memory
         bool success;
-        // uint256 returnSize;
-        // uint256 returnValue;
-        // perform staticcall from the stack w yul
         assembly {
             success := staticcall(
                 // gas
@@ -680,11 +607,7 @@ contract P2PIX is
                 // retSize
                 0x20
             )
-            // returnSize := returndatasize()
-            // returnValue := mload(0x00)
-            // _spendLimit := returnValue
             _spendLimit := mload(0x00)
-            // reverts if call does not succeed.
             if iszero(success) {
                 // StaticCallFailed()
                 mstore(0x00, 0xe10bf1cc)
diff --git a/hardhat.config.ts b/hardhat.config.ts
index 0af5df4..b2963f1 100644
--- a/hardhat.config.ts
+++ b/hardhat.config.ts
@@ -113,10 +113,16 @@ const config: HardhatUserConfig = {
     version: "0.8.19",
     settings: {
       viaIR: true,
+      evmVersion: "paris",
       optimizer: {
         enabled: true,
         runs: 20_000,
         details: {
+          deduplicate: true,
+          cse: true,
+          constantOptimizer: true,
+          peephole: true,
+          jumpdestRemover: true,
           yul: true,
           yulDetails: {
             stackAllocation: true,
diff --git a/src/types/factories/lib/utils/ECDSA__factory.ts b/src/types/factories/lib/utils/ECDSA__factory.ts
new file mode 100644
index 0000000..a1b7140
--- /dev/null
+++ b/src/types/factories/lib/utils/ECDSA__factory.ts
@@ -0,0 +1,62 @@
+/* Autogenerated file. Do not edit manually. */
+/* tslint:disable */
+/* eslint-disable */
+import { Signer, utils, Contract, ContractFactory, Overrides } from "ethers";
+import type { Provider, TransactionRequest } from "@ethersproject/providers";
+import type { PromiseOrValue } from "../../../common";
+import type { ECDSA, ECDSAInterface } from "../../../lib/utils/ECDSA";
+
+const _abi = [
+  {
+    inputs: [],
+    name: "InvalidSignature",
+    type: "error",
+  },
+];
+
+const _bytecode =
+  "0x60808060405234601757603a9081601d823930815050f35b600080fdfe600080fdfea26469706673582212201f6fe8a460e1235bb7e19365d8e3cc56b718d44f5db82f5fa3c90d3c7da59ebf64736f6c63430008130033";
+
+type ECDSAConstructorParams =
+  | [signer?: Signer]
+  | ConstructorParameters<typeof ContractFactory>;
+
+const isSuperArgs = (
+  xs: ECDSAConstructorParams
+): xs is ConstructorParameters<typeof ContractFactory> => xs.length > 1;
+
+export class ECDSA__factory extends ContractFactory {
+  constructor(...args: ECDSAConstructorParams) {
+    if (isSuperArgs(args)) {
+      super(...args);
+    } else {
+      super(_abi, _bytecode, args[0]);
+    }
+  }
+
+  override deploy(
+    overrides?: Overrides & { from?: PromiseOrValue<string> }
+  ): Promise<ECDSA> {
+    return super.deploy(overrides || {}) as Promise<ECDSA>;
+  }
+  override getDeployTransaction(
+    overrides?: Overrides & { from?: PromiseOrValue<string> }
+  ): TransactionRequest {
+    return super.getDeployTransaction(overrides || {});
+  }
+  override attach(address: string): ECDSA {
+    return super.attach(address) as ECDSA;
+  }
+  override connect(signer: Signer): ECDSA__factory {
+    return super.connect(signer) as ECDSA__factory;
+  }
+
+  static readonly bytecode = _bytecode;
+  static readonly abi = _abi;
+  static createInterface(): ECDSAInterface {
+    return new utils.Interface(_abi) as ECDSAInterface;
+  }
+  static connect(address: string, signerOrProvider: Signer | Provider): ECDSA {
+    return new Contract(address, _abi, signerOrProvider) as ECDSA;
+  }
+}
diff --git a/src/types/factories/lib/utils/index.ts b/src/types/factories/lib/utils/index.ts
index 7dd2d19..4f91906 100644
--- a/src/types/factories/lib/utils/index.ts
+++ b/src/types/factories/lib/utils/index.ts
@@ -1,6 +1,7 @@
 /* Autogenerated file. Do not edit manually. */
 /* tslint:disable */
 /* eslint-disable */
+export { ECDSA__factory } from "./ECDSA__factory";
 export { Multicall__factory } from "./Multicall__factory";
 export { ReentrancyGuard__factory } from "./ReentrancyGuard__factory";
 export { SafeTransferLib__factory } from "./SafeTransferLib__factory";
diff --git a/src/types/factories/p2pix.sol/P2PIX__factory.ts b/src/types/factories/p2pix.sol/P2PIX__factory.ts
index 0ca0e4a..ed7149d 100644
--- a/src/types/factories/p2pix.sol/P2PIX__factory.ts
+++ b/src/types/factories/p2pix.sol/P2PIX__factory.ts
@@ -415,19 +415,6 @@ const _abi = [
     name: "ValidSignersUpdated",
     type: "event",
   },
-  {
-    inputs: [],
-    name: "WAD",
-    outputs: [
-      {
-        internalType: "uint256",
-        name: "",
-        type: "uint256",
-      },
-    ],
-    stateMutability: "view",
-    type: "function",
-  },
   {
     inputs: [
       {
@@ -669,14 +656,14 @@ const _abi = [
         type: "address",
       },
       {
-        internalType: "uint256",
+        internalType: "uint80",
         name: "_relayerPremium",
-        type: "uint256",
+        type: "uint80",
       },
       {
-        internalType: "uint256",
+        internalType: "uint80",
         name: "_amount",
-        type: "uint256",
+        type: "uint80",
       },
       {
         internalType: "bytes32[]",
@@ -693,7 +680,7 @@ const _abi = [
     outputs: [
       {
         internalType: "uint256",
-        name: "",
+        name: "lockID",
         type: "uint256",
       },
     ],
@@ -733,16 +720,6 @@ const _abi = [
         name: "counter",
         type: "uint256",
       },
-      {
-        internalType: "uint256",
-        name: "relayerPremium",
-        type: "uint256",
-      },
-      {
-        internalType: "uint256",
-        name: "amount",
-        type: "uint256",
-      },
       {
         internalType: "uint256",
         name: "expirationBlock",
@@ -753,6 +730,16 @@ const _abi = [
         name: "pixTarget",
         type: "uint160",
       },
+      {
+        internalType: "uint80",
+        name: "relayerPremium",
+        type: "uint80",
+      },
+      {
+        internalType: "uint80",
+        name: "amount",
+        type: "uint80",
+      },
       {
         internalType: "address",
         name: "buyerAddress",
@@ -1087,7 +1074,7 @@ const _abi = [
 ];
 
 const _bytecode =
-  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
 type P2PIXConstructorParams =
   | [signer?: Signer]
diff --git a/src/types/hardhat.d.ts b/src/types/hardhat.d.ts
index c7a6011..da4e298 100644
--- a/src/types/hardhat.d.ts
+++ b/src/types/hardhat.d.ts
@@ -32,6 +32,10 @@ declare module "hardhat/types/runtime" {
       name: "ERC20",
       signerOrOptions?: ethers.Signer | FactoryOptions
     ): Promise<Contracts.ERC20__factory>;
+    getContractFactory(
+      name: "ECDSA",
+      signerOrOptions?: ethers.Signer | FactoryOptions
+    ): Promise<Contracts.ECDSA__factory>;
     getContractFactory(
       name: "Multicall",
       signerOrOptions?: ethers.Signer | FactoryOptions
@@ -78,6 +82,11 @@ declare module "hardhat/types/runtime" {
       address: string,
       signer?: ethers.Signer
     ): Promise<Contracts.ERC20>;
+    getContractAt(
+      name: "ECDSA",
+      address: string,
+      signer?: ethers.Signer
+    ): Promise<Contracts.ECDSA>;
     getContractAt(
       name: "Multicall",
       address: string,
diff --git a/src/types/index.ts b/src/types/index.ts
index 03b7ca5..70aec47 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -17,6 +17,8 @@ export type { MockToken } from "./lib/mock/mockToken.sol/MockToken";
 export { MockToken__factory } from "./factories/lib/mock/mockToken.sol/MockToken__factory";
 export type { ERC20 } from "./lib/tokens/ERC20";
 export { ERC20__factory } from "./factories/lib/tokens/ERC20__factory";
+export type { ECDSA } from "./lib/utils/ECDSA";
+export { ECDSA__factory } from "./factories/lib/utils/ECDSA__factory";
 export type { Multicall } from "./lib/utils/Multicall";
 export { Multicall__factory } from "./factories/lib/utils/Multicall__factory";
 export type { ReentrancyGuard } from "./lib/utils/ReentrancyGuard";
diff --git a/src/types/lib/utils/ECDSA.ts b/src/types/lib/utils/ECDSA.ts
new file mode 100644
index 0000000..6ed0ddd
--- /dev/null
+++ b/src/types/lib/utils/ECDSA.ts
@@ -0,0 +1,56 @@
+/* Autogenerated file. Do not edit manually. */
+/* tslint:disable */
+/* eslint-disable */
+import type { BaseContract, Signer, utils } from "ethers";
+
+import type { Listener, Provider } from "@ethersproject/providers";
+import type {
+  TypedEventFilter,
+  TypedEvent,
+  TypedListener,
+  OnEvent,
+  PromiseOrValue,
+} from "../../common";
+
+export interface ECDSAInterface extends utils.Interface {
+  functions: {};
+
+  events: {};
+}
+
+export interface ECDSA extends BaseContract {
+  connect(signerOrProvider: Signer | Provider | string): this;
+  attach(addressOrName: string): this;
+  deployed(): Promise<this>;
+
+  interface: ECDSAInterface;
+
+  queryFilter<TEvent extends TypedEvent>(
+    event: TypedEventFilter<TEvent>,
+    fromBlockOrBlockhash?: string | number | undefined,
+    toBlock?: string | number | undefined
+  ): Promise<Array<TEvent>>;
+
+  listeners<TEvent extends TypedEvent>(
+    eventFilter?: TypedEventFilter<TEvent>
+  ): Array<TypedListener<TEvent>>;
+  listeners(eventName?: string): Array<Listener>;
+  removeAllListeners<TEvent extends TypedEvent>(
+    eventFilter: TypedEventFilter<TEvent>
+  ): this;
+  removeAllListeners(eventName?: string): this;
+  off: OnEvent<this>;
+  on: OnEvent<this>;
+  once: OnEvent<this>;
+  removeListener: OnEvent<this>;
+
+  functions: {};
+
+  callStatic: {};
+
+  filters: {};
+
+  estimateGas: {};
+
+  populateTransaction: {};
+}
diff --git a/src/types/lib/utils/index.ts b/src/types/lib/utils/index.ts
index 73ea0b4..7c62577 100644
--- a/src/types/lib/utils/index.ts
+++ b/src/types/lib/utils/index.ts
@@ -1,6 +1,7 @@
 /* Autogenerated file. Do not edit manually. */
 /* tslint:disable */
 /* eslint-disable */
+export type { ECDSA } from "./ECDSA";
 export type { Multicall } from "./Multicall";
 export type { ReentrancyGuard } from "./ReentrancyGuard";
 export type { SafeTransferLib } from "./SafeTransferLib";
diff --git a/src/types/p2pix.sol/P2PIX.ts b/src/types/p2pix.sol/P2PIX.ts
index c7c9a8b..b4d2f89 100644
--- a/src/types/p2pix.sol/P2PIX.ts
+++ b/src/types/p2pix.sol/P2PIX.ts
@@ -29,7 +29,6 @@ import type {
 
 export interface P2PIXInterface extends utils.Interface {
   functions: {
-    "WAD()": FunctionFragment;
     "_castAddrToKey(address)": FunctionFragment;
     "_castKeyToAddr(uint256)": FunctionFragment;
     "allowedERC20s(address)": FunctionFragment;
@@ -40,7 +39,7 @@ export interface P2PIXInterface extends utils.Interface {
     "getLocksStatus(uint256[])": FunctionFragment;
     "getPixTarget(address,address)": FunctionFragment;
     "getValid(address,address)": FunctionFragment;
-    "lock(address,address,address,uint256,uint256,bytes32[],uint256[])": FunctionFragment;
+    "lock(address,address,address,uint80,uint80,bytes32[],uint256[])": FunctionFragment;
     "lockCounter()": FunctionFragment;
     "mapLocks(uint256)": FunctionFragment;
     "owner()": FunctionFragment;
@@ -65,7 +64,6 @@ export interface P2PIXInterface extends utils.Interface {
 
   getFunction(
     nameOrSignatureOrTopic:
-      | "WAD"
       | "_castAddrToKey"
       | "_castKeyToAddr"
       | "allowedERC20s"
@@ -99,7 +97,6 @@ export interface P2PIXInterface extends utils.Interface {
       | "withdrawBalance"
   ): FunctionFragment;
 
-  encodeFunctionData(functionFragment: "WAD", values?: undefined): string;
   encodeFunctionData(
     functionFragment: "_castAddrToKey",
     values: [PromiseOrValue<string>]
@@ -246,7 +243,6 @@ export interface P2PIXInterface extends utils.Interface {
     values?: undefined
   ): string;
 
-  decodeFunctionResult(functionFragment: "WAD", data: BytesLike): Result;
   decodeFunctionResult(
     functionFragment: "_castAddrToKey",
     data: BytesLike
@@ -545,8 +541,6 @@ export interface P2PIX extends BaseContract {
   removeListener: OnEvent<this>;
 
   functions: {
-    WAD(overrides?: CallOverrides): Promise<[BigNumber]>;
-
     _castAddrToKey(
       _addr: PromiseOrValue<string>,
       overrides?: CallOverrides
@@ -632,10 +626,10 @@ export interface P2PIX extends BaseContract {
       ] & {
         sellerKey: BigNumber;
         counter: BigNumber;
-        relayerPremium: BigNumber;
-        amount: BigNumber;
         expirationBlock: BigNumber;
         pixTarget: BigNumber;
+        relayerPremium: BigNumber;
+        amount: BigNumber;
         buyerAddress: string;
         relayerAddress: string;
         token: string;
@@ -736,8 +730,6 @@ export interface P2PIX extends BaseContract {
     ): Promise<ContractTransaction>;
   };
 
-  WAD(overrides?: CallOverrides): Promise<BigNumber>;
-
   _castAddrToKey(
     _addr: PromiseOrValue<string>,
     overrides?: CallOverrides
@@ -823,10 +815,10 @@ export interface P2PIX extends BaseContract {
     ] & {
       sellerKey: BigNumber;
       counter: BigNumber;
-      relayerPremium: BigNumber;
-      amount: BigNumber;
       expirationBlock: BigNumber;
       pixTarget: BigNumber;
+      relayerPremium: BigNumber;
+      amount: BigNumber;
       buyerAddress: string;
       relayerAddress: string;
       token: string;
@@ -927,8 +919,6 @@ export interface P2PIX extends BaseContract {
   ): Promise<ContractTransaction>;
 
   callStatic: {
-    WAD(overrides?: CallOverrides): Promise<BigNumber>;
-
     _castAddrToKey(
       _addr: PromiseOrValue<string>,
       overrides?: CallOverrides
@@ -1014,10 +1004,10 @@ export interface P2PIX extends BaseContract {
       ] & {
         sellerKey: BigNumber;
         counter: BigNumber;
-        relayerPremium: BigNumber;
-        amount: BigNumber;
         expirationBlock: BigNumber;
         pixTarget: BigNumber;
+        relayerPremium: BigNumber;
+        amount: BigNumber;
         buyerAddress: string;
         relayerAddress: string;
         token: string;
@@ -1231,8 +1221,6 @@ export interface P2PIX extends BaseContract {
   };
 
   estimateGas: {
-    WAD(overrides?: CallOverrides): Promise<BigNumber>;
-
     _castAddrToKey(
       _addr: PromiseOrValue<string>,
       overrides?: CallOverrides
@@ -1401,8 +1389,6 @@ export interface P2PIX extends BaseContract {
   };
 
   populateTransaction: {
-    WAD(overrides?: CallOverrides): Promise<PopulatedTransaction>;
-
     _castAddrToKey(
       _addr: PromiseOrValue<string>,
       overrides?: CallOverrides
diff --git a/test/p2pix.test.ts b/test/p2pix.test.ts
index c242324..2e35dc1 100644
--- a/test/p2pix.test.ts
+++ b/test/p2pix.test.ts
@@ -850,7 +850,7 @@ describe("P2PIX", () => {
       const endtoendID = ethers.constants.HashZero;
       const target = ethers.BigNumber.from(101);
       const messageToSign = ethers.utils.solidityKeccak256(
-        ["uint160", "uint256", "bytes32"],
+        ["uint160", "uint80", "bytes32"],
         [target, price, endtoendID],
       );
       const messageHashBytes =
@@ -1257,7 +1257,7 @@ describe("P2PIX", () => {
     it("should revert if lock has expired", async () => {
       const target = ethers.BigNumber.from(101);
       const messageToSign = ethers.utils.solidityKeccak256(
-        ["uint160", "uint256", "bytes32"],
+        ["uint160", "uint80", "bytes32"],
         [target, 100, ethers.constants.HashZero],
       );
       const flatSig = await acc01.signMessage(
@@ -1302,7 +1302,7 @@ describe("P2PIX", () => {
       const target = ethers.BigNumber.from("1");
       const hashZero = ethers.constants.HashZero;
       const messageToSign = ethers.utils.solidityKeccak256(
-        ["uint160", "uint256", "bytes32"],
+        ["uint160", "uint80", "bytes32"],
         [target, 100, hashZero],
       );
       const flatSig = await acc01.signMessage(
@@ -1352,7 +1352,7 @@ describe("P2PIX", () => {
     it("should revert if signed message has already been used", async () => {
       const target = ethers.BigNumber.from(101);
       const messageToSign = ethers.utils.solidityKeccak256(
-        ["uint160", "uint256", "bytes32"],
+        ["uint160", "uint80", "bytes32"],
         [target, 100, ethers.constants.HashZero],
       );
       const flatSig = await owner.signMessage(
@@ -1417,7 +1417,7 @@ describe("P2PIX", () => {
     it("should revert if ecrecovered signer is invalid", async () => {
       const target = ethers.BigNumber.from(101);
       const messageToSign = ethers.utils.solidityKeccak256(
-        ["uint160", "uint256", "bytes32"],
+        ["uint160", "uint80", "bytes32"],
         [target, 100, ethers.constants.HashZero],
       );
       const flatSig = await acc03.signMessage(
@@ -1464,7 +1464,7 @@ describe("P2PIX", () => {
       const endtoendID = ethers.constants.HashZero;
       const pixTarget = ethers.BigNumber.from(101);
       const messageToSign = ethers.utils.solidityKeccak256(
-        ["uint160", "uint256", "bytes32"],
+        ["uint160", "uint80", "bytes32"],
         [pixTarget, 100, endtoendID],
       );
       // Note: messageToSign is a string, that is 66-bytes long, to sign the
@@ -1632,7 +1632,7 @@ describe("P2PIX", () => {
         acc03Key,
       );
       const messageToSign1 = ethers.utils.solidityKeccak256(
-        ["uint160", "uint256", "bytes32"],
+        ["uint160", "uint80", "bytes32"],
         [pixTarget, 100, endtoendID],
       );
       const flatSig1 = await owner.signMessage(
@@ -1640,7 +1640,7 @@ describe("P2PIX", () => {
       );
       const sig1 = ethers.utils.splitSignature(flatSig1);
       const messageToSign2 = ethers.utils.solidityKeccak256(
-        ["uint160", "uint256", "bytes32"],
+        ["uint160", "uint80", "bytes32"],
         [pixTarget, 50, endtoendID],
       );
       const flatSig2 = await owner.signMessage(
@@ -1648,7 +1648,7 @@ describe("P2PIX", () => {
       );
       const sig2 = ethers.utils.splitSignature(flatSig2);
       const messageToSign3 = ethers.utils.solidityKeccak256(
-        ["uint160", "uint256", "bytes32"],
+        ["uint160", "uint80", "bytes32"],
         [pixTarget, 25, endtoendID],
       );
       const flatSig3 = await owner.signMessage(
@@ -1885,7 +1885,7 @@ describe("P2PIX", () => {
       const endtoendID = ethers.constants.HashZero;
       const pixTarget = ethers.BigNumber.from(101);
       const messageToSign = ethers.utils.solidityKeccak256(
-        ["uint160", "uint256", "bytes32"],
+        ["uint160", "uint80", "bytes32"],
         [pixTarget, 1, endtoendID],
       );
       const messageHashBytes =