đź“… Original date posted:2014-07-15
đź“ť Original message:Thankfully those two duplicated transactions were never spent when they first appeared. Because of that, I chose to not not add them to the UTXO at all when they first appear. When the duplicates appear they get added to the UTXO successfully because the earlier, conflicting versions are not present. That way you can carry on assuming that all transaction hashes are unique, and enforce that rule over the entire blockchain.
Date: Mon, 14 Jul 2014 13:18:22 +0200
From: mike at plan99.net
To: me at ricmoo.com
CC: bitcoin-development at lists.sourceforge.net
Subject: Re: [Bitcoin-development] Self-dependency transaction question...
Conceptually all transactions in the block chain lie on a single timeline. The fact that we quantise that timeline into blocks is in many ways neither here nor there - it's still a strict line.
What can happen and you must be aware of is duplicated transactions. Satoshi sort of assumed this could never happen because everything is hash based, but forgot that duplicating coinbases is possible and at one point this did happen. It was banned by a rule change afterwards but you still must be able to process the older parts of the chain that have this. There is a BIP that covers the new rule.
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Paul Lyon [ARCHIVE] /
npub1j7…nz4rc
2023-06-07 15:23:43
in reply to nevent1q…pmnh
Author Public Key
npub1j7aht4gsujjs429043y5rz6yn75xm32tm42wunpc5kwp7mdxuscsknz4rcPublished at
2023-06-07 15:23:43Event JSON
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"content": "📅 Original date posted:2014-07-15\n📝 Original message:Thankfully those two duplicated transactions were never spent when they first appeared. Because of that, I chose to not not add them to the UTXO at all when they first appear. When the duplicates appear they get added to the UTXO successfully because the earlier, conflicting versions are not present. That way you can carry on assuming that all transaction hashes are unique, and enforce that rule over the entire blockchain.\n\nDate: Mon, 14 Jul 2014 13:18:22 +0200\nFrom: mike at plan99.net\nTo: me at ricmoo.com\nCC: bitcoin-development at lists.sourceforge.net\nSubject: Re: [Bitcoin-development] Self-dependency transaction question...\n\nConceptually all transactions in the block chain lie on a single timeline. The fact that we quantise that timeline into blocks is in many ways neither here nor there - it's still a strict line. \n\nWhat can happen and you must be aware of is duplicated transactions. Satoshi sort of assumed this could never happen because everything is hash based, but forgot that duplicating coinbases is possible and at one point this did happen. It was banned by a rule change afterwards but you still must be able to process the older parts of the chain that have this. There is a BIP that covers the new rule.\n\n\n\n------------------------------------------------------------------------------\nWant fast and easy access to all the code in your enterprise? Index and\nsearch up to 200,000 lines of code with a free copy of Black Duck®\nCode Sight™ - the same software that powers the world's largest code\nsearch on Ohloh, the Black Duck Open Hub! Try it now.\nhttp://p.sf.net/sfu/bds\n_______________________________________________\nBitcoin-development mailing list\nBitcoin-development at lists.sourceforge.net\nhttps://lists.sourceforge.net/lists/listinfo/bitcoin-development \t\t \t \t\t \n-------------- next part --------------\nAn HTML attachment was scrubbed...\nURL: \u003chttp://lists.linuxfoundation.org/pipermail/bitcoin-dev/attachments/20140715/c82730dd/attachment.html\u003e",
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