hood// SPDX-License-Identifier: CC0-1.0
pragma solidity 0.8.23;
/// @notice `ERC6538Registry` contract to map accounts to their stealth meta-address. See
/// [ERC-6538](https://eips.ethereum.org/EIPS/eip-6538) to learn more.
contract ERC6538Registry {
/// @notice Emitted when an invalid signature is provided to `registerKeysOnBehalf`.
error ERC6538Registry__InvalidSignature();
/// @notice Next nonce expected from `user` to use when signing for `registerKeysOnBehalf`.
/// @dev `registrant` may be a standard 160-bit address or any other identifier.
/// @dev `schemeId` is an integer identifier for the stealth address scheme.
mapping(address registrant => mapping(uint256 schemeId => bytes)) public stealthMetaAddressOf;
/// @notice A nonce used to ensure a signature can only be used once.
/// @dev `registrant` is the user address.
/// @dev `nonce` will be incremented after each valid `registerKeysOnBehalf` call.
mapping(address registrant => uint256) public nonceOf;
/// @notice The EIP-712 type hash used in `registerKeysOnBehalf`.
bytes32 public constant ERC6538REGISTRY_ENTRY_TYPE_HASH =
keccak256("Erc6538RegistryEntry(uint256 schemeId,bytes stealthMetaAddress,uint256 nonce)");
/// @notice The chain ID where this contract is initially deployed.
uint256 internal immutable INITIAL_CHAIN_ID;
/// @notice The domain separator used in this contract.
bytes32 internal immutable INITIAL_DOMAIN_SEPARATOR;
/// @notice Emitted when a registrant updates their stealth meta-address.
/// @param registrant The account that registered the stealth meta-address.
/// @param schemeId Identifier corresponding to the applied stealth address scheme, e.g. 1 for
/// secp256k1, as specified in ERC-5564.
/// @param stealthMetaAddress The stealth meta-address.
/// [ERC-5564](https://eips.ethereum.org/EIPS/eip-5564) bases the format for stealth
/// meta-addresses on [ERC-3770](https://eips.ethereum.org/EIPS/eip-3770) and specifies them as:
/// st:<shortName>:0x<spendingPubKey>:<viewingPubKey>
/// The chain (`shortName`) is implicit based on the chain the `ERC6538Registry` is deployed on,
/// therefore this `stealthMetaAddress` is just the compressed `spendingPubKey` and
/// `viewingPubKey` concatenated.
event StealthMetaAddressSet(
address indexed registrant, uint256 indexed schemeId, bytes stealthMetaAddress
);
/// @notice Emitted when a registrant increments their nonce.
/// @param registrant The account that incremented the nonce.
/// @param newNonce The new nonce value.
event NonceIncremented(address indexed registrant, uint256 newNonce);
constructor() {
INITIAL_CHAIN_ID = block.chainid;
INITIAL_DOMAIN_SEPARATOR = _computeDomainSeparator();
}
/// @notice Sets the caller's stealth meta-address for the given scheme ID.
/// @param schemeId Identifier corresponding to the applied stealth address scheme, e.g. 1 for
/// secp256k1, as specified in ERC-5564.
/// @param stealthMetaAddress The stealth meta-address to register.
function registerKeys(uint256 schemeId, bytes calldata stealthMetaAddress) external {
stealthMetaAddressOf[msg.sender][schemeId] = stealthMetaAddress;
emit StealthMetaAddressSet(msg.sender, schemeId, stealthMetaAddress);
}
/// @notice Sets the `registrant`'s stealth meta-address for the given scheme ID.
/// @param registrant Address of the registrant.
/// @param schemeId Identifier corresponding to the applied stealth address scheme, e.g. 1 for
/// secp256k1, as specified in ERC-5564.
/// @param signature A signature from the `registrant` authorizing the registration.
/// @param stealthMetaAddress The stealth meta-address to register.
/// @dev Supports both EOA signatures and EIP-1271 signatures.
/// @dev Reverts if the signature is invalid.
function registerKeysOnBehalf(
address registrant,
uint256 schemeId,
bytes memory signature,
bytes calldata stealthMetaAddress
) external {
bytes32 dataHash;
address recoveredAddress;
unchecked {
dataHash = keccak256(
abi.encodePacked(
"\x19\x01",
DOMAIN_SEPARATOR(),
keccak256(
abi.encode(
ERC6538REGISTRY_ENTRY_TYPE_HASH,
schemeId,
keccak256(stealthMetaAddress),
nonceOf[registrant]++
)
)
)
);
}
if (signature.length == 65) {
bytes32 r;
bytes32 s;
uint8 v;
assembly ("memory-safe") {
r := mload(add(signature, 0x20))
s := mload(add(signature, 0x40))
v := byte(0, mload(add(signature, 0x60)))
}
recoveredAddress = ecrecover(dataHash, v, r, s);
}
if (
(
(recoveredAddress == address(0) || recoveredAddress != registrant)
&& (
IERC1271(registrant).isValidSignature(dataHash, signature)
!= IERC1271.isValidSignature.selector
)
)
) revert ERC6538Registry__InvalidSignature();
stealthMetaAddressOf[registrant][schemeId] = stealthMetaAddress;
emit StealthMetaAddressSet(registrant, schemeId, stealthMetaAddress);
}
/// @notice Increments the nonce of the sender to invalidate existing signatures.
function incrementNonce() external {
unchecked {
nonceOf[msg.sender]++;
}
emit NonceIncremented(msg.sender, nonceOf[msg.sender]);
}
/// @notice Returns the domain separator used in this contract.
/// @dev The domain separator is re-computed if there's a chain fork.
function DOMAIN_SEPARATOR() public view returns (bytes32) {
return block.chainid == INITIAL_CHAIN_ID ? INITIAL_DOMAIN_SEPARATOR : _computeDomainSeparator();
}
/// @notice Computes the domain separator for this contract.
function _computeDomainSeparator() internal view returns (bytes32) {
return keccak256(
abi.encode(
keccak256(
"EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"
),
keccak256("ERC6538Registry"),
keccak256("1.0"),
block.chainid,
address(this)
)
);
}
}
/// @notice Interface of the ERC1271 standard signature validation method for contracts as defined
/// in https://eips.ethereum.org/EIPS/eip-1271[ERC-1271].
interface IERC1271 {
/// @notice Should return whether the signature provided is valid for the provided data
/// @param hash Hash of the data to be signed
/// @param signature Signature byte array associated with _data
function isValidSignature(bytes32 hash, bytes memory signature)
external
view
returns (bytes4 magicValue);
}[
{
"type": "constructor",
"inputs": [],
"stateMutability": "nonpayable"
},
{
"name": "ERC6538Registry__InvalidSignature",
"type": "error",
"inputs": []
},
{
"name": "NonceIncremented",
"type": "event",
"inputs": [
{
"name": "registrant",
"type": "address",
"indexed": true,
"internalType": "address"
},
{
"name": "newNonce",
"type": "uint256",
"indexed": false,
"internalType": "uint256"
}
],
"anonymous": false
},
{
"name": "StealthMetaAddressSet",
"type": "event",
"inputs": [
{
"name": "registrant",
"type": "address",
"indexed": true,
"internalType": "address"
},
{
"name": "schemeId",
"type": "uint256",
"indexed": true,
"internalType": "uint256"
},
{
"name": "stealthMetaAddress",
"type": "bytes",
"indexed": false,
"internalType": "bytes"
}
],
"anonymous": false
},
{
"name": "DOMAIN_SEPARATOR",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "",
"type": "bytes32",
"internalType": "bytes32"
}
],
"stateMutability": "view"
},
{
"name": "ERC6538REGISTRY_ENTRY_TYPE_HASH",
"type": "function",
"inputs": [],
"outputs": [
{
"name": "",
"type": "bytes32",
"internalType": "bytes32"
}
],
"stateMutability": "view"
},
{
"name": "incrementNonce",
"type": "function",
"inputs": [],
"outputs": [],
"stateMutability": "nonpayable"
},
{
"name": "nonceOf",
"type": "function",
"inputs": [
{
"name": "registrant",
"type": "address",
"internalType": "address"
}
],
"outputs": [
{
"name": "",
"type": "uint256",
"internalType": "uint256"
}
],
"stateMutability": "view"
},
{
"name": "registerKeys",
"type": "function",
"inputs": [
{
"name": "schemeId",
"type": "uint256",
"internalType": "uint256"
},
{
"name": "stealthMetaAddress",
"type": "bytes",
"internalType": "bytes"
}
],
"outputs": [],
"stateMutability": "nonpayable"
},
{
"name": "registerKeysOnBehalf",
"type": "function",
"inputs": [
{
"name": "registrant",
"type": "address",
"internalType": "address"
},
{
"name": "schemeId",
"type": "uint256",
"internalType": "uint256"
},
{
"name": "signature",
"type": "bytes",
"internalType": "bytes"
},
{
"name": "stealthMetaAddress",
"type": "bytes",
"internalType": "bytes"
}
],
"outputs": [],
"stateMutability": "nonpayable"
},
{
"name": "stealthMetaAddressOf",
"type": "function",
"inputs": [
{
"name": "registrant",
"type": "address",
"internalType": "address"
},
{
"name": "schemeId",
"type": "uint256",
"internalType": "uint256"
}
],
"outputs": [
{
"name": "",
"type": "bytes",
"internalType": "bytes"
}
],
"stateMutability": "view"
}
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| Token | Symbol | Balance | Price | Value |
|---|---|---|---|---|
| no token holdings | ||||
| Block | Age | Parent Transaction Hash | Type | Method | From | To | Value | |
|---|---|---|---|---|---|---|---|---|
| no internal transactions found for this address yet (traced blocks + on-demand) | ||||||||
| Type | Age | Block | Details |
|---|---|---|---|
| no cross-chain L1↔L2 transactions for this address | |||
| Txn Hash | Age | Event | Topics / Data |
|---|---|---|---|
| 0x017686…967e3c | 7 days agoMon, 10 Aug 2026 14:12:15 UTC | 0x4e739a…7af9 | [0] 0x000000000000…6bbe9443 [1] 0x000000000000…00000001 data: 0x000000000000000000…00000000 |
| 0x6206f4…0a8149 | 7 days agoMon, 10 Aug 2026 14:04:03 UTC | 0x4e739a…7af9 | [0] 0x000000000000…6bbe9443 [1] 0x000000000000…00000001 data: 0x000000000000000000…00000000 |
| 0x6991b4…55498f | 26 days agoWed, 22 Jul 2026 05:04:01 UTC | 0x4e739a…7af9 | [0] 0x000000000000…deca7d03 [1] 0x000000000000…00000001 data: 0x000000000000000000…00000000 |
| 0xb56df4…b747e9 | 26 days agoWed, 22 Jul 2026 04:47:01 UTC | 0x4e739a…7af9 | [0] 0x000000000000…f5e70223 [1] 0x000000000000…00000001 data: 0x000000000000000000…00000000 |
| 0x54d7c1…bcd32b | 29 days agoSun, 19 Jul 2026 03:09:42 UTC | 0x4e739a…7af9 | [0] 0x000000000000…e691096d [1] 0x000000000000…00000001 data: 0x000000000000000000…00000000 |
| Transaction Hash | Method | Block | Age | From | To | Type | Item | ||
|---|---|---|---|---|---|---|---|---|---|
| no NFT transfers for this address yet | |||||||||
| Transaction Hash | Method | Block | Age | From | To | Amount | Token | ||
|---|---|---|---|---|---|---|---|---|---|
| no token transfers for this address yet | |||||||||
| Transaction Hash | Method ? | Block | Age | From | To | Amount | Txn Fee ? | ||
|---|---|---|---|---|---|---|---|---|---|
| 0x017686…967e3c | registerKeys | 32,860,651 | 7 days agoMon, 10 Aug 2026 14:12:15 UTC | 0x9ad0…9443 | IN | ERC6538Registry | $0.000 ETH | 0.00000116 | |
| 0x6206f4…0a8149 | registerKeys | 32,855,741 | 7 days agoMon, 10 Aug 2026 14:04:03 UTC | 0x9ad0…9443 | IN | ERC6538Registry | $0.000 ETH | 0.00000297 | |
| 0x6991b4…55498f | registerKeys | 16,159,411 | 26 days agoWed, 22 Jul 2026 05:04:01 UTC | 0x2df2…7d03 | IN | ERC6538Registry | $0.000 ETH | 0.00000870 | |
| 0xb56df4…b747e9 | registerKeys | 16,149,245 | 26 days agoWed, 22 Jul 2026 04:47:01 UTC | 0x7168…0223 | IN | ERC6538Registry | $0.000 ETH | 0.00000870 | |
| 0x54d7c1…bcd32b | registerKeys | 13,507,146 | 29 days agoSun, 19 Jul 2026 03:09:42 UTC | 0xf1c3…096d | IN | ERC6538Registry | $0.000 ETH | 0.00000726 |