demo-self-reg.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.2 <0.9.0;

interface ContractsRegistrar {
    function selfRegister(uint256) external;
}

contract MyContract {

    uint256 number;

    function doStuff(uint256 num) public {
        number = num;
    }

    function doSelfReg() public {
        // register on Blaze-testnet
        ContractsRegistrar(0xFcb5774258B165a78e0F43dB91a20ebE25Aea4Fa).selfRegister(0x20);
    }
}