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Cross-Chain Token Contract V1.2

The OFT V1.2 Contract is a Solidity smart contract that facilitates cross-chain token transfers between EVM and non-EVM contracts. It inherits from BaseOFTV2 and ERC20, implementing functions for managing token supply, transfers, and allowances. The contract ensures compatibility with Endpoint V1 and includes mechanisms for debiting and crediting tokens during transfers.

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23 views2 pages

Cross-Chain Token Contract V1.2

The OFT V1.2 Contract is a Solidity smart contract that facilitates cross-chain token transfers between EVM and non-EVM contracts. It inherits from BaseOFTV2 and ERC20, implementing functions for managing token supply, transfers, and allowances. The contract ensures compatibility with Endpoint V1 and includes mechanisms for debiting and crediting tokens during transfers.

Uploaded by

infraestruturanexusarena02
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "./BaseOFTV2.sol";

/// @title OFT V1.2 Contract


/// @notice This contract is version 1.2 of the OFT Standard, enabling cross-chain
token transfers between EVM and non-EVM contracts.
/// @dev This contract is only compatible with Endpoint V1.
contract OFTV2 is BaseOFTV2, ERC20 {
uint internal immutable ld2sdRate;

constructor(
string memory _name,
string memory _symbol,
uint8 _sharedDecimals,
address _lzEndpoint
) ERC20(_name, _symbol) BaseOFTV2(_sharedDecimals, _lzEndpoint) {
uint8 decimals = decimals();
require(_sharedDecimals <= decimals, "OFT: sharedDecimals must be <=
decimals");
ld2sdRate = 10**(decimals - _sharedDecimals);
}

/************************************************************************
* public functions
************************************************************************/
function circulatingSupply() public view virtual override returns (uint) {
return totalSupply();
}

function token() public view virtual override returns (address) {


return address(this);
}

/************************************************************************
* internal functions
************************************************************************/
function _debitFrom(
address _from,
uint16,
bytes32,
uint _amount
) internal virtual override returns (uint) {
address spender = _msgSender();
if (_from != spender) _spendAllowance(_from, spender, _amount);
_burn(_from, _amount);
return _amount;
}

function _creditTo(
uint16,
address _toAddress,
uint _amount
) internal virtual override returns (uint) {
_mint(_toAddress, _amount);
return _amount;
}

function _transferFrom(
address _from,
address _to,
uint _amount
) internal virtual override returns (uint) {
address spender = _msgSender();
// if transfer from this contract, no need to check allowance
if (_from != address(this) && _from != spender) _spendAllowance(_from,
spender, _amount);
_transfer(_from, _to, _amount);
return _amount;
}

function _ld2sdRate() internal view virtual override returns (uint) {


return ld2sdRate;
}
}

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