pragma solidity ^0.6.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/access/Ownable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol";

contract SNCLToken is ERC20, Ownable {

    mapping (address => bool) public actives;
    bool public stopped = true;

    constructor() ERC20("Signacle", "SNCL") public {
    }

    function mint(address to, uint256 amount) public onlyOwner {
        _mint(to, amount);
    }

    function start() public onlyOwner {
        stopped = false;
    }

    function activate(address addr) public onlyOwner {
        actives[addr] = true;
    }

    function deactivate(address addr) public onlyOwner {
        actives[addr] = false;
    }

    function _beforeTokenTransfer(address from, address to, uint256 amount) internal override {
        require(!stopped || actives[to] || actives[from], "transfer is only available for active accounts");
    }

}

{
  "compilationTarget": {
    "browser/SignacleToken.sol": "SNCLToken"
  },
  "evmVersion": "istanbul",
  "libraries": {},
  "metadata": {
    "bytecodeHash": "ipfs"
  },
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "remappings": []
}