2019-03-10 21:28:49 +00:00
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---
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2021-09-21 11:42:48 +00:00
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summary: 'a way of saving bandwidth when sending new blocks around the network'
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2019-03-10 21:28:49 +00:00
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terms: ["fluffy blocks", "fluffyblocks"]
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---
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2020-08-16 17:11:02 +00:00
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{% include disclaimer.html translated="no" translationOutdated="no" %}
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2021-09-21 11:42:48 +00:00
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2019-03-10 21:28:49 +00:00
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### The Basics
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2021-09-21 11:42:48 +00:00
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A @block is made up of a header and @transactions. Fluffy Blocks only
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contain a header, a list of transaction indices, and any transactions that
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the node recieving the block may be missing. This saves bandwidth because
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nodes might already know about most or all of the transactions in the block
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and they don't need to be sent them again.
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2019-03-10 21:28:49 +00:00
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### See Also
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2021-09-21 11:42:48 +00:00
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* [BIP152 "Compact Block
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Relay"](https://github.com/bitcoin/bips/blob/master/bip-0152.mediawiki)
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2019-03-10 21:28:49 +00:00
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* [Xthin](https://github.com/BitcoinUnlimited/BitcoinUnlimited/blob/release/doc/bu-xthin-protocol.md)
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