An example operation may include one or more of requesting, by a client, a service that does not require an account registration, providing, by a server coupled to the client, calculation parameters comprising block content for a new block of a blockchain network to the client, calculating, by the client, one or more hashes of the block content while changing one or more nonces in the block, verifying the one or more hashes and nonces of the block content are valid, submitting, by the client, the one or more valid nonces to the server, submitting a valid hash to the blockchain network, and in response receiving a reward from the blockchain network.