An example operation may include one or more of connecting, by a broker node, to a blockchain comprised of an arranger node and a plurality of client nodes, retrieving from the blockchain, by the broker node, a request for information sent by a client node of the plurality of the client nodes, decrypting, by the broker node, the request for the information with a private key of the broker node, extracting, by the broker node, a public key of a client associated with the client node from the decrypted request for the information, selecting, by the broker node, a set of client properties based on the public key of the client, generating, by the broker node, a modified request for information based on the request for the information and the set of the client properties, and sending, by the broker node, the modified request for the information to the arranger node.