contract CryptonomicaVerification {

    /**
    * @param _address The address to check
    * @return 0 if key certificate is not revoked, or Unix time of revocation
    */
    function revokedOn(address _address) external view returns (uint unixTime);

    /**
    * @param _address The address to check
    * @return Unix time
    */
    function keyCertificateValidUntil(address _address) external view returns (uint unixTime);
}
/**
 * see: https://www.cryptonomica.net/#!/verifyEthAddress/
 * in our bills of exchange smart contracts:
 * 1) every new admin should have a verified identity on cryptonomica.net
 * 2) every person that signs (draw or accept) a bill should be verified
 */
function keyCertificateValidUntil(address _address) external view returns (uint unixTime);

/**
 * @param _address The address to check
 * @return Unix time
 */