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CrossSpaceCall

CIP-90 引入了一个新的内置合约：CrossSpaceCall. CrossSpaceCall 允许在两个空间之间转移 CFX 和数据。

接口​

这个合约的十六进制地址是 0x0888000000000000000000000000000000000006 ，接口为:

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0;

interface CrossSpaceCall {
    event Call(bytes20 indexed sender, bytes20 indexed receiver, uint256 value, uint256 nonce, bytes data);

    event Create(bytes20 indexed sender, bytes20 indexed contract_address, uint256 value, uint256 nonce, bytes init);

    event Withdraw(bytes20 indexed sender, address indexed receiver, uint256 value, uint256 nonce);

    event Outcome(bool success);

    /**
     * @dev Deploy a contract in eSpace
     * @param init bytes -  The contract init bytecode
     * @return bytes20 - The hex address of the deployed contract
     */
    function createEVM(bytes calldata init) external payable returns (bytes20);

    /**
     * @dev Transfer CFX from Core space to eSpace specify address. 转账金额由交易值指定。
     * @param to bytes20 - The hex address of the receiver address in eSpace
     * @return output bytes
     */
    function transferEVM(bytes20 to) external payable returns (bytes memory output);

    /**
     * @dev Call eSpace contract method from Core space
     * @param to bytes20 - The hex address of the contract in eSpace
     * @param data bytes - The contract method call data
     * @return output bytes - Method call result
     */ 
    function callEVM(bytes20 to, bytes calldata data) external payable returns (bytes memory output);

    /**
     * @dev Static call eSpace contract method from Core space
     * @param to bytes20 - The hex address of the contract in eSpace
     * @param data bytes - The contract method call data
     * @return output bytes - Method call result
     */ 
    function staticCallEVM(bytes20 to, bytes calldata data) external view returns (bytes memory output);

    /**
     * @dev Widthdraw CFX from eSpace mapped account's balance
     * @param value uint256 - The amount of CFX to be withdrawn
     */ 
    function withdrawFromMapped(uint256 value) external;

    /**
     * @dev Query eSpace mapped account's CFX balance
     * @param addr address - The core address to query
     * @return uint256 - Balance
     */
    function mappedBalance(address addr) external view returns (uint256);

    /**
     * @dev Query eSpace mapped account's nonce
     * @param addr address - The core address to query
     * @return uint256 - Balance
     * */ 
    function mappedNonce(address addr) external view returns (uint256);
}

注意：CrossSpaceCall合约部署在Core Space。 它只能从Core Space调用。

进一步说明​

有关如何使用 CrossSpaceCall 合约在Core Space 和 eSpace 之间跨域 CFX 和数据的详细信息，请查看此处。 你也可以在那里找到 JS 和 Solidity 的示例。

跨空间桥 Dapp​

普通用户可以直接通过其钱包（ Fluent 和 MetaMask ）轻松地使用空间桥 Dapp 跨 CFX。