Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- DepositContract
- Optimization enabled
- true
- Compiler version
- v0.8.16+commit.07a7930e
- Optimization runs
- 200
- EVM Version
- london
- Verified at
- 2025-07-15T13:59:15.758126Z
DepositContract.sol
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// SPDX-License-Identifier: CC0-1.0
pragma solidity ^0.8.16;
// Based on official specification in https://eips.ethereum.org/EIPS/eip-165
interface ERC165 {
/// @notice Query if a contract implements an interface
/// @param interfaceId The interface identifier, as specified in ERC-165
/// @dev Interface identification is specified in ERC-165. This function uses less than 30,000 gas.
/// @return `true` if the contract implements `interfaceId` and `interfaceId` is not 0xffffffff, `false` otherwise
function supportsInterface(bytes4 interfaceId) external pure returns (bool);
}
/// @notice This is the FastexChain(Bahamut) deposit contract interface.
interface IDepositContract {
/// @notice A processed deposit event.
event DepositEvent(
bytes pubkey,
bytes withdrawal_credentials,
bytes contract_address,
bytes amount,
bytes signature,
bytes index
);
/**
* @notice Submit a DepositData object.
* @param pubkey A BLS12-381 public key.
* @param withdrawal_credentials Commitment to a public key for withdrawals.
* @param contract_address Address of the smart contract that a associated with this deposit.
* @param signature A BLS12-381 signature.
* @param deposit_data_root The SHA-256 hash of the SSZ-encoded DepositData object.
*/
function deposit(
bytes calldata pubkey,
bytes calldata withdrawal_credentials,
bytes calldata contract_address,
bytes calldata signature,
bytes32 deposit_data_root
) external payable;
/**
* @notice Changes contract ownership
* @param contract_address Address of the smart contract which ownership need to transfer
* @param new_owner_address New owner address
*/
function transfer_contract_ownership(address contract_address, address new_owner_address) external;
/**
* @notice Query the owner of the given contract
* @return The owner of the contract
*/
function get_contract_owner(address contract_address) external view returns (address);
/**
* @notice Query the current deposit root hash.
* @return The deposit root hash.
*/
function get_deposit_root() external view returns (bytes32);
/**
* @notice Query the current deposit count.
* @return The deposit count encoded as a little endian 64-bit number.
*/
function get_deposit_count() external view returns (bytes memory);
}
/// @notice This is the FastexChain(Bahamut) deposit contract interface.
contract DepositContract is IDepositContract, ERC165 {
uint256 private constant DEPOSIT_CONTRACT_TREE_DEPTH = 32;
// NOTE: this also ensures `deposit_count` will fit into 64-bits
uint256 private constant MAX_DEPOSIT_COUNT = 2**DEPOSIT_CONTRACT_TREE_DEPTH - 1;
bytes32[DEPOSIT_CONTRACT_TREE_DEPTH] private branch;
uint256 private deposit_count;
bytes32[DEPOSIT_CONTRACT_TREE_DEPTH] private zero_hashes;
address private deployer_getter = 0x1000000000000000000000000000000000000002;
mapping (address => address) private contract_owners;
constructor() {
// Compute hashes in empty sparse Merkle tree
for (uint256 height = 0; height < DEPOSIT_CONTRACT_TREE_DEPTH - 1; height++) {
zero_hashes[height + 1] = sha256(abi.encodePacked(zero_hashes[height], zero_hashes[height]));
}
}
function get_deposit_root() override external view returns (bytes32) {
bytes32 node;
uint256 size = deposit_count;
for (uint256 height = 0; height < DEPOSIT_CONTRACT_TREE_DEPTH; height++) {
if ((size & 1) == 1)
node = sha256(abi.encodePacked(branch[height], node));
else
node = sha256(abi.encodePacked(node, zero_hashes[height]));
size /= 2;
}
return sha256(abi.encodePacked(
node,
_to_little_endian_64(uint64(deposit_count)),
bytes24(0)
));
}
function get_deposit_count() override external view returns (bytes memory) {
return _to_little_endian_64(uint64(deposit_count));
}
function transfer_contract_ownership(address contract_address, address new_owner_address) override external {
require(address(0x0) != contract_address, 'DepositContract: Contract address cannot be null');
require(address(0x0) != new_owner_address, 'DepositContract: Owner address cannot be null');
require(msg.sender == get_contract_owner(contract_address), 'DepositContract: Only owner can transfer ownership');
contract_owners[contract_address] = new_owner_address;
}
function deposit(
bytes calldata pubkey,
bytes calldata withdrawal_credentials,
bytes calldata contract_address,
bytes calldata signature,
bytes32 deposit_data_root
) override external payable {
// Extended ABI length checks since dynamic types are used.
require(pubkey.length == 48, "DepositContract: invalid pubkey length");
require(withdrawal_credentials.length == 32, "DepositContract: invalid withdrawal_credentials length");
require(contract_address.length == 20, "DepositContract: invalid withdrawal_credentials length");
require(signature.length == 96, "DepositContract: invalid signature length");
// Check deposit amount
address c_address = _to_address(contract_address);
if (address(0x0) != c_address) {
require(get_contract_owner(c_address) == msg.sender, "DepositContract: sender should be owner of contract");
}
require(msg.value >= 256 ether, "DepositContract: deposit value too low");
require(msg.value % 1 gwei == 0, "DepositContract: deposit value not multiple of gwei");
uint256 deposit_amount = msg.value / 1 gwei;
require(deposit_amount <= type(uint64).max, "DepositContract: deposit value too high");
// Emit `DepositEvent` log
bytes memory amount = _to_little_endian_64(uint64(deposit_amount));
emit DepositEvent(
pubkey,
withdrawal_credentials,
contract_address,
amount,
signature,
_to_little_endian_64(uint64(deposit_count))
);
// Compute deposit data root (`DepositData` hash tree root)
bytes32 root = _calculate_root(
pubkey,
withdrawal_credentials,
contract_address,
amount,
signature);
// Verify computed and expected deposit data roots match
require(root == deposit_data_root, "DepositContract: reconstructed DepositData does not match supplied deposit_data_root");
// Avoid overflowing the Merkle tree (and prevent edge case in computing `branch`)
require(deposit_count < MAX_DEPOSIT_COUNT, "DepositContract: merkle tree full");
// Add deposit data root to Merkle tree (update a single `branch` node)
deposit_count += 1;
_update_branch(root);
}
function supportsInterface(bytes4 interfaceId) override external pure returns (bool) {
return interfaceId == type(ERC165).interfaceId || interfaceId == type(IDepositContract).interfaceId;
}
function get_contract_owner(address contract_address) override public view returns (address) {
if (address(0x0) != contract_owners[contract_address]) {
return contract_owners[contract_address];
}
(bool success, bytes memory deployer) = deployer_getter.staticcall(abi.encodePacked(contract_address));
require(success, 'DepositContract: Cannot get deployer');
return _to_address(deployer);
}
/// Helper member functions
function _to_address(bytes memory addr) private pure returns (address ret_address) {
assembly {
ret_address := mload(add(addr, 20))
}
}
function _to_little_endian_64(uint64 value) private pure returns (bytes memory ret) {
ret = new bytes(8);
bytes8 bytesValue = bytes8(value);
// Byteswapping during copying to bytes.
ret[0] = bytesValue[7];
ret[1] = bytesValue[6];
ret[2] = bytesValue[5];
ret[3] = bytesValue[4];
ret[4] = bytesValue[3];
ret[5] = bytesValue[2];
ret[6] = bytesValue[1];
ret[7] = bytesValue[0];
}
function _calculate_root(
bytes calldata pubkey,
bytes calldata withdrawal_credentials,
bytes calldata contract_address,
bytes memory amount,
bytes calldata signature)
pure
private
returns(bytes32) {
bytes32 pubkey_root = sha256(abi.encodePacked(pubkey, bytes16(0)));
bytes32 signature_root = sha256(abi.encodePacked(
sha256(abi.encodePacked(signature[:64])),
sha256(abi.encodePacked(signature[64:], bytes32(0)))
));
bytes32 node1 = sha256(abi.encodePacked(pubkey_root, withdrawal_credentials));
bytes32 node2 = sha256(abi.encodePacked(contract_address, bytes12(0), amount, bytes24(0)));
bytes32 node3 = sha256(abi.encodePacked(signature_root, bytes32(0)));
bytes32 node4 = sha256(abi.encodePacked(bytes32(0), bytes32(0)));
bytes32 node12 = sha256(abi.encodePacked(node1, node2));
bytes32 node34 = sha256(abi.encodePacked(node3, node4));
return sha256(abi.encodePacked(node12, node34));
}
function _update_branch(bytes32 root) private {
uint256 size = deposit_count;
for (uint256 height = 0; height < DEPOSIT_CONTRACT_TREE_DEPTH; height++) {
if ((size & 1) == 1) {
branch[height] = root;
return;
}
root = sha256(abi.encodePacked(branch[height], root));
size /= 2;
}
// As the loop should always end prematurely with the `return` statement,
// this code should be unreachable. We assert `false` just to be safe.
assert(false);
}
}
Compiler Settings
{"outputSelection":{"*":{"*":["*"],"":["*"]}},"optimizer":{"runs":200,"enabled":true},"metadata":{"bytecodeHash":"ipfs"},"libraries":{"DepositContract.sol":{}},"evmVersion":"london"}
Contract ABI
[{"type":"constructor","stateMutability":"nonpayable","inputs":[]},{"type":"event","name":"DepositEvent","inputs":[{"type":"bytes","name":"pubkey","internalType":"bytes","indexed":false},{"type":"bytes","name":"withdrawal_credentials","internalType":"bytes","indexed":false},{"type":"bytes","name":"contract_address","internalType":"bytes","indexed":false},{"type":"bytes","name":"amount","internalType":"bytes","indexed":false},{"type":"bytes","name":"signature","internalType":"bytes","indexed":false},{"type":"bytes","name":"index","internalType":"bytes","indexed":false}],"anonymous":false},{"type":"function","stateMutability":"payable","outputs":[],"name":"deposit","inputs":[{"type":"bytes","name":"pubkey","internalType":"bytes"},{"type":"bytes","name":"withdrawal_credentials","internalType":"bytes"},{"type":"bytes","name":"contract_address","internalType":"bytes"},{"type":"bytes","name":"signature","internalType":"bytes"},{"type":"bytes32","name":"deposit_data_root","internalType":"bytes32"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"address","name":"","internalType":"address"}],"name":"get_contract_owner","inputs":[{"type":"address","name":"contract_address","internalType":"address"}]},{"type":"function","stateMutability":"view","outputs":[{"type":"bytes","name":"","internalType":"bytes"}],"name":"get_deposit_count","inputs":[]},{"type":"function","stateMutability":"view","outputs":[{"type":"bytes32","name":"","internalType":"bytes32"}],"name":"get_deposit_root","inputs":[]},{"type":"function","stateMutability":"pure","outputs":[{"type":"bool","name":"","internalType":"bool"}],"name":"supportsInterface","inputs":[{"type":"bytes4","name":"interfaceId","internalType":"bytes4"}]},{"type":"function","stateMutability":"nonpayable","outputs":[],"name":"transfer_contract_ownership","inputs":[{"type":"address","name":"contract_address","internalType":"address"},{"type":"address","name":"new_owner_address","internalType":"address"}]}]
Contract Creation Code
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