DepositContract

Deploy on Alchemy
Verified
Ethereum
Verified, Router
Solidity
Verified
Ethereum

Contract Information

The following smart contract implements a deposit contract for the Ethereum 2.0 network. It allows users to deposit Ether and receive a validator key in return. The contract stores the deposits in a Merkle tree and generates a Merkle root that is used to verify the deposit. The contract also implements the ERC165 interface for contract introspection.
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DepositContract Source Code

// ┏━━━┓━┏┓━┏┓━━┏━━━┓━━┏━━━┓━━━━┏━━━┓━━━━━━━━━━━━━━━━━━━┏┓━━━━━┏━━━┓━━━━━━━━━┏┓━━━━━━━━━━━━━━┏┓━ // ┃┏━━┛┏┛┗┓┃┃━━┃┏━┓┃━━┃┏━┓┃━━━━┗┓┏┓┃━━━━━━━━━━━━━━━━━━┏┛┗┓━━━━┃┏━┓┃━━━━━━━━┏┛┗┓━━━━━━━━━━━━┏┛┗┓ // ┃┗━━┓┗┓┏┛┃┗━┓┗┛┏┛┃━━┃┃━┃┃━━━━━┃┃┃┃┏━━┓┏━━┓┏━━┓┏━━┓┏┓┗┓┏┛━━━━┃┃━┗┛┏━━┓┏━┓━┗┓┏┛┏━┓┏━━┓━┏━━┓┗┓┏┛ // ┃┏━━┛━┃┃━┃┏┓┃┏━┛┏┛━━┃┃━┃┃━━━━━┃┃┃┃┃┏┓┃┃┏┓┃┃┏┓┃┃━━┫┣┫━┃┃━━━━━┃┃━┏┓┃┏┓┃┃┏┓┓━┃┃━┃┏┛┗━┓┃━┃┏━┛━┃┃━ // ┃┗━━┓━┃┗┓┃┃┃┃┃┃┗━┓┏┓┃┗━┛┃━━━━┏┛┗┛┃┃┃━┫┃┗┛┃┃┗┛┃┣━━┃┃┃━┃┗┓━━━━┃┗━┛┃┃┗┛┃┃┃┃┃━┃┗┓┃┃━┃┗┛┗┓┃┗━┓━┃┗┓ // ┗━━━┛━┗━┛┗┛┗┛┗━━━┛┗┛┗━━━┛━━━━┗━━━┛┗━━┛┃┏━┛┗━━┛┗━━┛┗┛━┗━┛━━━━┗━━━┛┗━━┛┗┛┗┛━┗━┛┗┛━┗━━━┛┗━━┛━┗━┛ // ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┃┃━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ // ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┗┛━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ // SPDX-License-Identifier: CC0-1.0 pragma solidity 0.6.11; // This interface is designed to be compatible with the Vyper version. /// @notice This is the Ethereum 2.0 deposit contract interface. /// For more information see the Phase 0 specification under https://github.com/ethereum/eth2.0-specs interface IDepositContract { /// @notice A processed deposit event. event DepositEvent( bytes pubkey, bytes withdrawal_credentials, bytes amount, bytes signature, bytes index ); /// @notice Submit a Phase 0 DepositData object. /// @param pubkey A BLS12-381 public key. /// @param withdrawal_credentials Commitment to a public key for withdrawals. /// @param signature A BLS12-381 signature. /// @param deposit_data_root The SHA-256 hash of the SSZ-encoded DepositData object. /// Used as a protection against malformed input. function deposit( bytes calldata pubkey, bytes calldata withdrawal_credentials, bytes calldata signature, bytes32 deposit_data_root ) external payable; /// @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); } // 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); } // This is a rewrite of the Vyper Eth2.0 deposit contract in Solidity. // It tries to stay as close as possible to the original source code. /// @notice This is the Ethereum 2.0 deposit contract interface. /// For more information see the Phase 0 specification under https://github.com/ethereum/eth2.0-specs contract DepositContract is IDepositContract, ERC165 { uint constant DEPOSIT_CONTRACT_TREE_DEPTH = 32; // NOTE: this also ensures `deposit_count` will fit into 64-bits uint constant MAX_DEPOSIT_COUNT = 2**DEPOSIT_CONTRACT_TREE_DEPTH - 1; bytes32[DEPOSIT_CONTRACT_TREE_DEPTH] branch; uint256 deposit_count; bytes32[DEPOSIT_CONTRACT_TREE_DEPTH] zero_hashes; constructor() public { // Compute hashes in empty sparse Merkle tree for (uint 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; uint size = deposit_count; for (uint 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 deposit( bytes calldata pubkey, bytes calldata withdrawal_credentials, 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(signature.length == 96, "DepositContract: invalid signature length"); // Check deposit amount require(msg.value >= 1 ether, "DepositContract: deposit value too low"); require(msg.value % 1 gwei == 0, "DepositContract: deposit value not multiple of gwei"); uint 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, amount, signature, to_little_endian_64(uint64(deposit_count)) ); // Compute deposit data root (`DepositData` hash tree root) 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 node = sha256(abi.encodePacked( sha256(abi.encodePacked(pubkey_root, withdrawal_credentials)), sha256(abi.encodePacked(amount, bytes24(0), signature_root)) )); // Verify computed and expected deposit data roots match require(node == 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; uint size = deposit_count; for (uint height = 0; height < DEPOSIT_CONTRACT_TREE_DEPTH; height++) { if ((size & 1) == 1) { branch[height] = node; return; } node = sha256(abi.encodePacked(branch[height], node)); 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); } function supportsInterface(bytes4 interfaceId) override external pure returns (bool) { return interfaceId == type(ERC165).interfaceId || interfaceId == type(IDepositContract).interfaceId; } function to_little_endian_64(uint64 value) internal 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]; } }
< // ┏━━━┓━┏┓━┏┓━━┏━━━┓━━┏━━━┓━━━━┏━━━┓━━━━━━━━━━━━━━━━━━━┏┓━━━━━┏━━━┓━━━━━━━━━┏┓━━━━━━━━━━━━━━┏┓━
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// SPDX-License-Identifier: CC0-1.0

pragma solidity 0.6.11;

// This interface is designed to be compatible with the Vyper version.
/// @notice This is the Ethereum 2.0 deposit contract interface.
/// For more information see the Phase 0 specification under https://github.com/ethereum/eth2.0-specs
interface IDepositContract {
    /// @notice A processed deposit event.
    event DepositEvent(
        bytes pubkey,
        bytes withdrawal_credentials,
        bytes amount,
        bytes signature,
        bytes index
    );

    /// @notice Submit a Phase 0 DepositData object.
    /// @param pubkey A BLS12-381 public key.
    /// @param withdrawal_credentials Commitment to a public key for withdrawals.
    /// @param signature A BLS12-381 signature.
    /// @param deposit_data_root The SHA-256 hash of the SSZ-encoded DepositData object.
    /// Used as a protection against malformed input.
    function deposit(
        bytes calldata pubkey,
        bytes calldata withdrawal_credentials,
        bytes calldata signature,
        bytes32 deposit_data_root
    ) external payable;

    /// @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);
}

// 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);
}

// This is a rewrite of the Vyper Eth2.0 deposit contract in Solidity.
// It tries to stay as close as possible to the original source code.
/// @notice This is the Ethereum 2.0 deposit contract interface.
/// For more information see the Phase 0 specification under https://github.com/ethereum/eth2.0-specs
contract DepositContract is IDepositContract, ERC165 {
    uint constant DEPOSIT_CONTRACT_TREE_DEPTH = 32;
    // NOTE: this also ensures `deposit_count` will fit into 64-bits
    uint constant MAX_DEPOSIT_COUNT = 2**DEPOSIT_CONTRACT_TREE_DEPTH - 1;

    bytes32[DEPOSIT_CONTRACT_TREE_DEPTH] branch;
    uint256 deposit_count;

    bytes32[DEPOSIT_CONTRACT_TREE_DEPTH] zero_hashes;

    constructor() public {
        // Compute hashes in empty sparse Merkle tree
        for (uint 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;
        uint size = deposit_count;
        for (uint 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 deposit(
        bytes calldata pubkey,
        bytes calldata withdrawal_credentials,
        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(signature.length == 96, "DepositContract: invalid signature length");

        // Check deposit amount
        require(msg.value >= 1 ether, "DepositContract: deposit value too low");
        require(msg.value % 1 gwei == 0, "DepositContract: deposit value not multiple of gwei");
        uint 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,
            amount,
            signature,
            to_little_endian_64(uint64(deposit_count))
        );

        // Compute deposit data root (`DepositData` hash tree root)
        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 node = sha256(abi.encodePacked(
            sha256(abi.encodePacked(pubkey_root, withdrawal_credentials)),
            sha256(abi.encodePacked(amount, bytes24(0), signature_root))
        ));

        // Verify computed and expected deposit data roots match
        require(node == 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;
        uint size = deposit_count;
        for (uint height = 0; height < DEPOSIT_CONTRACT_TREE_DEPTH; height++) {
            if ((size & 1) == 1) {
                branch[height] = node;
                return;
            }
            node = sha256(abi.encodePacked(branch[height], node));
            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);
    }

    function supportsInterface(bytes4 interfaceId) override external pure returns (bool) {
        return interfaceId == type(ERC165).interfaceId || interfaceId == type(IDepositContract).interfaceId;
    }

    function to_little_endian_64(uint64 value) internal 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];
    }
} < 

DepositContract ABI

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes","name":"pubkey","type":"bytes"},{"indexed":false,"internalType":"bytes","name":"withdrawal_credentials","type":"bytes"},{"indexed":false,"internalType":"bytes","name":"amount","type":"bytes"},{"indexed":false,"internalType":"bytes","name":"signature","type":"bytes"},{"indexed":false,"internalType":"bytes","name":"index","type":"bytes"}],"name":"DepositEvent","type":"event"},{"inputs":[{"internalType":"bytes","name":"pubkey","type":"bytes"},{"internalType":"bytes","name":"withdrawal_credentials","type":"bytes"},{"internalType":"bytes","name":"signature","type":"bytes"},{"internalType":"bytes32","name":"deposit_data_root","type":"bytes32"}],"name":"deposit","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"get_deposit_count","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"get_deposit_root","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"}]

DepositContract Bytecode

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