Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Blockchain example. Multiple transactions (such as transfers of money) take place. Each transaction is hashed. Hash values are combined into a hash tree. The hash tree, hash of the previous block, and a timestamp are inserted into the new block. Nonces are used in this example as a proof-of-work consensus mechanism as part of a mathematical challenge. When a solution is found to the challenge, the new block is added to the blockchain
