📅 Original date posted:2016-05-02
📝 Original message:
>
> Or require a 110k preimage to redeem, drop to the blockchain, then
> redeem it by sending direct to a miner. A node trying to use that
> preimage would create a non-standard transaction, which may not
> propagate. Similarly with an almost 4MB preimage which requires you
> to grind out a tiny signature to redeem in a tx small enough...
>
Segwit's witness program validation logic ensures that each element of the
passed witness stack is less-than-or-equal-to the maximum script element
size (520 bytes). This check is enforced before execution itself.
Therefore, even without the additional OP_SIZE check, Script will enforce a
ceiling on the pre-image size.
We've also recently made such an observation, resulting in a modification
to our scripts similar to the one you've detailed. Thanks for sounding the
alarm with this mailing-list post!
Best,
Laolu
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Olaoluwa Osuntokun [ARCHIVE] /
npub19h…zkvn4
2023-06-09 12:46:15
in reply to nevent1q…mzek
Author Public Key
npub19helcfnqgk2jrwzjex2aflq6jwfc8zd9uzzkwlgwhve7lykv23mq5zkvn4Published at
2023-06-09 12:46:15Event JSON
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"content": "📅 Original date posted:2016-05-02\n📝 Original message:\n\u003e\n\u003e Or require a 110k preimage to redeem, drop to the blockchain, then\n\u003e redeem it by sending direct to a miner. A node trying to use that\n\u003e preimage would create a non-standard transaction, which may not\n\u003e propagate. Similarly with an almost 4MB preimage which requires you\n\u003e to grind out a tiny signature to redeem in a tx small enough...\n\u003e\n\nSegwit's witness program validation logic ensures that each element of the\npassed witness stack is less-than-or-equal-to the maximum script element\nsize (520 bytes). This check is enforced before execution itself.\nTherefore, even without the additional OP_SIZE check, Script will enforce a\nceiling on the pre-image size.\n\nWe've also recently made such an observation, resulting in a modification\nto our scripts similar to the one you've detailed. Thanks for sounding the\nalarm with this mailing-list post!\n\nBest,\nLaolu\n-------------- next part --------------\nAn HTML attachment was scrubbed...\nURL: \u003chttp://lists.linuxfoundation.org/pipermail/lightning-dev/attachments/20160502/fef7092a/attachment.html\u003e",
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