# BitcoinPod Overview

The remap is enabled by `BitcoinPod.sol`, a smart contract managed by the user along with the Operator of Eigenlayer/BitDSM. It is a direct mapping of a Bitcoin Address on Ethereum, representated as a smart contract. This does not mint an ERC-20 but instead stores the value as `bitcoinBalance` inside the contract.

```solidity
contract BitcoinPod is IBitcoinPod, OwnableUpgradeable {
    address public operator;
    bytes public operatorBtcPubKey;
    bytes public bitcoinAddress;
    uint256 public bitcoinBalance;
    bool public locked;
    address public immutable manager;
    bytes public signedBitcoinWithdrawTransaction;
```

A BitcoinPod contract is:

1. Non-transferable: Change of ownership of the BOD is not permitted.
2. Non-fungible: Only full value delegation is permissible.
3. Unique: A dedicated bitcoinpod contract deployed for each bitcoin address. Multiple bitcoin addresses cannot be mapped to a single bitcoinpod contract. 
4. Stateful or stateless: Bitcoin address mapped to a bitcoinpod contract can either hold the funds or act as a pass through address. 

As a client, you need to choose an operator to create a bitcoin address before you can deploy the BOD. The bitcoin address is created off-chain and later verified on chain to ensure the operator is part of the signing script. 

The address verification happens before BitcoinPod contract is deployed to ensure only eligible bitcoin addresses are mapped.

```solidity
function createPod(address operator, string memory btcAddress, bytes calldata scipt)                   
        external 
        whenNotPaused 
        nonReentrant
        returns (address)
    {
        require(_userToPod[msg.sender] == address(0), "User already has a pod");
        require(IBitDSMRegistry(_bitDSMRegistry).isOperatorBtcKeyRegistered(operator), "Invalid operator");
        
        bytes memory operatorBtcPubKey = IBitDSMRegistry(_bitDSMRegistry).getOperatorBtcPublicKey(operator);
       // console.logBytes(operatorBtcPubKey);
        // verify the btc address
        // try catch block to handle the error
        try IBitDSMServiceManager(_bitDSMServiceManager).verifyBTCAddress(btcAddress, scipt, operatorBtcPubKey) returns (bool isBtcAddress) {
            console.log("isBtcAddress", isBtcAddress);
        } catch (bytes memory reason) {
            console.log("Error verifying BTC address");
            console.logBytes(reason);
        }
       // console.log("isBtcAddress", isBtcAddress);
       // emit BTCAddressVerified(operator, btcAddress);
        // create the pod
        BitcoinPod newPod = new BitcoinPod(address(this));
        newPod.initialize(msg.sender, operator, operatorBtcPubKey, btcAddress);
        // increment the total pods
        _totalPods++;
        // set the user to pod mapping
        _setUserPod(msg.sender, address(newPod));
        
        emit PodCreated(msg.sender, address(newPod), operator);
        // return the pod address
        return address(newPod);
```


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