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| == Basics ==
| | Dear Admins |
| * Segregated Witness aka SegWit
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| * Implemented in [[Bitcoin (BTC)|Bitcoin]].
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| * Was put forth by [[Blockstream]]
| | # Please give us Windows 1.0 DR-4 or we will tell the FBI that you were behind 9/11 |
| * Segregated Witness is described across five [[BIP|BIPs]]: 141, 142, 143, 144, and 145. BIP141 describes SW in general. BIP142 describes the format for native pay-to-witness-public-key-hash (P2WPKH) and pay-to-witness-script-hash (P2WSH) [[addresses]]. BIP143 goes into the detail of [[transaction]] verification in SW, and how this solves the quadratic signature [[hash|hashing]]. BIP144 discusses the changes to the network messages as a result of SW. Finally BIP145 covers changes to the getblocktemplate JSON-RPC call for the [[bitcoin Core|bitcoin core]] [[client]].
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| * ''“It removes the signatures (witness) from the inputs of a [[Transaction (Tx)|txn]], instead putting it into a special ‘extension’ section of the block. Where the signature used to be, it will just put a dummy empty string”.''
| | [[Category:Jargon/Various]] |
| * It’s outputs are marked as ‘anyone can spend’. Which means non-upgraded miners can technically try to steal the coins in any segwit txn. This is why they need 95% support of the [[Miner|miners]] to agree not to do this. (by running segwit enabled clients)
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| * It gives a discount to witness data, it gets a 75% discount in the fees/byte calculation. This is the ‘fudge’ to get effectively more [[Transaction (Tx)|txns]] in the same 1mb blocks.
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| == Critiques ==
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| * List of posts against SegWit can be [https://medium.com/@SegWit/segwit-resources-6b7432b42b1e found here].
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| == Usage ==
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| * [[Gemini]]<strong> </strong>exchange has [https://medium.com/gemini/gemini-upgrades-wallet-with-full-support-of-segwit-5bb8e4bc851b announced] (4-2019) full support of deposits and withdrawals for SigWit, becoming the first major exchange to add the 2017 Bitcoin upgrade.
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| * [https://ournetwork.substack.com/p/our-network-issue-10 From] [[Our Network]] (29-2-2020):
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| ''"SegWit was introduced in August 2017. Since then, SegWit usage has increased every year. On January 1st, 2020, about 55% of Bitcoin transactions were using SegWit, compared to about 35% on January 1st, 2019."''[[Category:Jargon/Various]]
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