> For the complete documentation index, see [llms.txt](https://docs.escription.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.escription.io/crosscontract/icrossinscribe.md).

# ICrossInscribe

The ICrossInscribe interface defines a set of operations related to cross-chain signing and address binding.

## 一. The Owner‘s Method

## setValidatorAgreeCount(uint256 agreeCount)

Purpose: Sets the validator agreement count. 

Parameter: Agree count (uint256).

## setBridgeCosts(uint256 newFee)

Purpose: Sets the new bridge cost. 

Parameter: New bridge cost (uint256).

## getBridgeCosts()

Purpose: Retrieves the current bridge cost.

## changeBindAddressFee(uint256 newFee)

Purpose: Changes the binding address fee. 

Parameter: New binding address fee (uint256).

## getBindAddressFee()

Purpose: Retrieves the current binding address fee.

## setValidatorContract(address account)

Purpose: Sets the validator contract address. 

Parameter: Validator contract address (address).

## getValidatorContract()

Purpose: Retrieves the current validator contract address.

## refundFee(address payable toUser, uint256 amount)

Refunds a fee to a user.

## refundInscrition(address toUser, string memory tick, uint256 amount)

Purpose: Refunds an inscription  to a user

## 二. User‘s Method

## bindAddress(string memory btcAddress, bytes memory btcSignature)

Purpose: Binds a BTC address to an EVM address, requires a fee. Need User to Sign a btc address and

EVM address.

btcSignature need 65 byte, and add v at the signature front。

```
let v = sig.recid
if (v < 27) {
    v += 27;
}
let signature = new Uint8Array(65)
signature[0] = v;
for(let i =0; i < sig.signature.length; i++) {
    signature[i+1] = sig.signature[i];
}
```

## 三.Validator's Method

## bindAddressResponse(address user, uint256 nonce)

Purpose: Handles response for binding a BTC address.&#x20;

The validator verifies the user's signature and submits the result。

## getBoundBtcAddress(address evmAddress)

Purpose: Retrieves the bound BTC address for a given EVM address.

## getBoundEVMAddress(string memory btcAddress)

Purpose: Retrieves the bound EVM address for a given BTC address.

## bridgeToBTCResponse(address fromUser, uint256 nonce)

Purpose: Validator handles response for a cross-chain transaction to BTC.

## bridgeToBTCConfirm(address fromUser, uint256 nonce, bytes32 txID)

Purpose: Confirms a cross-chain transaction to BTC

## confirmBridgeBtcToEth(string memory txid, string memory inscriptonID, string memory inscription, string memory tick, uint256 amount, address toAddress)

Purpose: Confirms a cross-chain transaction from BTC to ESC

.