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pragma solidity ^0.8.0;
import "@layerzerolabs/solidity-examples/contracts/token/oft/v2/fee/OFTWithFee.sol";
contract BTCbOFT is OFTWithFee {
    constructor(address _lzEndpoint) OFTWithFee("Bitcoin", "BTC.b", 8, _lzEndpoint){}
    function decimals() public pure override returns (uint8){
        return 8;
    }
}// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "./BaseOFTWithFee.sol";
contract OFTWithFee is BaseOFTWithFee, ERC20 {
    uint internal immutable ld2sdRate;
    constructor(string memory _name, string memory _symbol, uint8 _sharedDecimals, address _lzEndpoint) ERC20(_name, _symbol) BaseOFTWithFee
        (_sharedDecimals, _lzEndpoint) {
        uint8 decimals = decimals();
        require(_sharedDecimals <= decimals, "OFTWithFee: 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) {
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