Lido.fi

1​
2// SPDX-License-Identifier: CC0-1.0
3​
4pragma solidity 0.6.11;
5​
6// This interface is designed to be compatible with the Vyper version.
7/// @notice This is the Ethereum 2.0 deposit contract interface.
8/// For more information see the Phase 0 specification under https://github.com/ethereum/eth2.0-specs
9interface IDepositContract {
10    /// @notice A processed deposit event.
11    event DepositEvent(
12        bytes pubkey,
13        bytes withdrawal_credentials,
14        bytes amount,
15        bytes signature,
16        bytes index
17    );
18​
19    /// @notice Submit a Phase 0 DepositData object.
20    /// @param pubkey A BLS12-381 public key.
21    /// @param withdrawal_credentials Commitment to a public key for withdrawals.
22    /// @param signature A BLS12-381 signature.
23    /// @param deposit_data_root The SHA-256 hash of the SSZ-encoded DepositData object.
24    /// Used as a protection against malformed input.
25    function deposit(
26        bytes calldata pubkey,
27        bytes calldata withdrawal_credentials,
28        bytes calldata signature,
29        bytes32 deposit_data_root
30    ) external payable;
31​
32    /// @notice Query the current deposit root hash.
33    /// @return The deposit root hash.
34    function get_deposit_root() external view returns (bytes32);
35​
36    // @notice Query the current deposit count.
37    // @return The deposit count encoded as a little endian 64-bit number.
38    function get_deposit_count() external view returns (bytes memory);
39}
40​
41// Based on official specification in https://eips.ethereum.org/EIPS/eip-165
42interface ERC165 {
43    /// @notice Query if a contract implements an interface
44    /// @param interfaceId The interface identifier, as specified in ERC-165
45    /// @dev Interface identification is specified in ERC-165. This function
46    ///  uses less than 30,000 gas.
47    /// @return `true` if the contract implements `interfaceId` and
48    ///  `interfaceId` is not 0xffffffff, `false` otherwise
49    function supportsInterface(bytes4 interfaceId) external pure returns (bool);
50}
51​
52// This is a rewrite of the Vyper Eth2.0 deposit contract in Solidity.
53// It tries to stay as close as possible to the original source code.
54/// @notice This is the Ethereum 2.0 deposit contract interface.
55/// For more information see the Phase 0 specification under https://github.com/ethereum/eth2.0-specs
56contract DepositContract is IDepositContract, ERC165 {
57    uint constant DEPOSIT_CONTRACT_TREE_DEPTH = 32;
58    // NOTE: this also ensures `deposit_count` will fit into 64-bits
59    uint constant MAX_DEPOSIT_COUNT = 2**DEPOSIT_CONTRACT_TREE_DEPTH - 1;
60​

Solidity Contracts

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