Abstract: An example operation may include one or more of storing one or more public keys of one or more policy services, receiving, via a signing service, a blockchain transaction that has content that has been verified by a policy service and includes a signature created by a private key of the policy service, verifying, via a hardware security module (HSM), the signature of the policy service based on a public key of the policy service from among the one or more public keys, and in response to a verification of the signature of the policy service, signing, via the HSM, the blockchain transaction using a wallet key of a user of the blockchain transaction.