add the source code

packages/contracts-periphery/contracts/universal/op-nft/AttestationStation.sol

+// SPDX-License-Identifier: MIT
+pragma solidity 0.8.15;
+
+import {
+    OwnableUpgradeable
+} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
+import { Semver } from "@eth-optimism/contracts-bedrock/contracts/universal/Semver.sol";
+import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
+
+contract AttestationStation is Initializable, OwnableUpgradeable, Semver {
+    struct AttestationData {
+        address about;
+        bytes32 key;
+        bytes val;
+    }
+
+    mapping(address => mapping(address => mapping(bytes32 => bytes))) public attestations;
+
+    event AttestationCreated(
+        address indexed creator,
+        address indexed about,
+        bytes32 indexed key,
+        bytes val
+    );
+
+    constructor() Semver(0, 0, 1) {}
+
+    /**
+     * @notice  Initialize the Optimist contract.
+     * @dev     Initializes the AttestationStation contract with msg.sender as owner
+     */
+    function initialize() public initializer {
+        __Ownable_init();
+    }
+
+    /**
+     * @notice  Attest to the given data.
+     * @dev     Attests to the given data from the sender.
+     * @param   _about  The address of the attestation subject.
+     * @param   _key  The key of the attestation.
+     * @param   _val  The value of the attestation.
+     */
+    function attest(
+        address _about,
+        bytes32 _key,
+        bytes memory _val
+    ) public {
+        attestations[msg.sender][_about][_key] = _val;
+        emit AttestationCreated(msg.sender, _about, _key, _val);
+    }
+
+    /**
+     * @notice  Attest to the given data.
+     * @dev     Attests to the given data from the sender.
+     * @param   _attestations  The array of attestation data.
+     */
+    function attestBulk(AttestationData[] memory _attestations) public {
+        for (uint256 i = 0; i < _attestations.length; ++i) {
+            attest(_attestations[i].about, _attestations[i].key, _attestations[i].val);
+        }
+    }
+
+    /**
+     * @notice  Reads an attestation
+     * @return  val bytes  The attestation
+     */
+    function readAttestation(
+        address _creator,
+        address _about,
+        bytes32 _key
+    ) public view returns (bytes memory val) {
+        val = this.attestations(_creator, _about, _key);
+        return val;
+    }
+}