// SPDX-License-Identifier: UNLICENSED

pragma solidity ^0.8.0;

contract TxOriginBank {
    address public teller;
    mapping(address => int256) public balances;

    constructor() {
        teller = tx.origin;
    }

    function withdraw(address addr, int256 amount) public {
        require(tx.origin == teller, "Not a teller");
        balances[addr] -= amount;
        require(balances[addr] >= 0, "Insufficient balance");
    }

    function getBalance(address addr) public view returns (int256) {
        return balances[addr];
    }
}