An example operation may include one or more of receiving a signed transaction from a blockchain member device, responsive to receiving the signed transaction, identifying a credential assigned to the blockchain member device, and the credential certifies a public key is assigned to the blockchain member device and was used to sign the signed transaction, determining whether to commit the signed transaction to a blockchain based on the credential, and responsive to determining to commit the signed transaction based on the credential, storing the signed transaction anonymously in the blockchain.