//if tx.value < tx.basefee * 200:
    // If not, stop
//    stop

// If registration is being requested
if msg.datasize == 3 and msg.data[0] == "register":
    // If the url/work combination has not been claimed
    if ! contract.storage[msg.data[1]]:
        // Set the owner to be the provided Ethereum address
        contract.storage[msg.data[1]] = msg.sender
        // Store the artwork hash next to the url ownership information
        contract.storage[msg.data[1] + 1] = msg.data[2]
        // return success
        return(1)
    // If the sender was trying to overwrite a work they do not own
    else:
        // They cannot set it, so return failure
        return(0)
// If ownership confirmation is being requested
// Confirm that the work and url hashes match
elif msg.datasize == 4 and msg.data[0] == "confirm":
    // Check the provided hashes against the stored work and url hashes
    return((contract.storage[msg.data[2]] == msg.data[1]) and (contract.storage[msg.data[2] + 1] == msg.data[3]))
// If no action was specified
else:
    // Otherwise do nothing
    return(0)