2019-03-11 15:28:21 +02:00
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---
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terms: ["fluffy blocks", "fluffyblocks"]
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summary: "a way of saving bandwidth when sending new blocks around the network"
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---
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2020-08-16 20:11:02 +03:00
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{% include disclaimer.html translated="no" translationOutdated="no" %}
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2019-03-11 15:28:21 +02:00
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### The Basics
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A @block is made up of a header and @transactions. Fluffy Blocks only contain
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a header, a list of transaction indices, and any transactions that the node
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recieving the block may be missing. This saves bandwidth because nodes might
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already know about most or all of the transactions in the block and they don't
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need to be sent them again.
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### See Also
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* [BIP152 "Compact Block Relay"](https://github.com/bitcoin/bips/blob/master/bip-0152.mediawiki)
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* [Xthin](https://github.com/BitcoinUnlimited/BitcoinUnlimited/blob/release/doc/bu-xthin-protocol.md)
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