Esta página ainda não está traduzida. Se você gostaria de ajudar a traduzi-la, veja a README
A block is made up of a header and transactions. Fluffy Blocks only contain a header, a list of transaction indices, and any transactions that the node recieving the block may be missing. This saves bandwidth because nodes might already know about most or all of the transactions in the block and they don't need to be sent them again.