US Patent 11316663 One-time password with unpredictable moving factor

Techniques for authentication using a blockchain hash value as a moving factor. The techniques include retrieving, by an authenticating device and from a blockchain, a current hash value of the blockchain, where the authenticating device and an authenticator server share a secret key value and each have access to the blockchain. The techniques further including generating, by the authenticating device, a secure token based on the secret key value and the current hash value. The techniques further including transmitting the secure token to the authenticator server and receiving an indication of authentication from the authenticator server.