Hyperledger Explorer is a user-friendly web application tool used to view or access transactions, digital wallets, and other information stored on a Hyperledger blockchain deployment.
Hyperledger Sawtooth is an open-source enterprise blockchain-as-a-service platform that can run customized smart contracts without the need to know the underlying structure of the underlying system.
Smart contracts are self-executing lines of code in which the terms of an agreement between a buyer and a seller are automatically verified and executed over a computer network.
— Nick Szabo, American computer scientist who invented a virtual currency called “Bit Gold” in 1998,