Abstract: Disclosed is a method, a device, and/or a system of rapid and secure off-ledger cryptocurrency transactions through cryptographic binding of a private key to a possession token. In one embodiment, a method for rapid and secure ledger-less transfer of a quantity of cryptocurrency includes generating a public-private key pair, securely storing the private key and utilizing the public key as a public address. The method verifies a ledger transaction on a distributed ledger network associated the quantity of cryptocurrency with the public address. The method generates a possession token having a state indicated by a state indicator. The state evolves upon transfer between two computing devices. The method cryptographically associates the ledger token and the possession token through incorporation of the public address into data generating the state indicator. The possession token is transferred to a computing device over the network while retaining the private key in secure custody.