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11:24 < Ademan> reardencode: I've seen a few references to "template key" but I haven't been able to track it down, just learned it's your creation, can you point me to a description?
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12:56 < Chris_Stewart_5> hi, i'm looking to implement OP_IN_OUT_AMOUNT as described in https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2021-September/019420.html
12:57 < Chris_Stewart_5> Is there any "base" logic that introduces the bitcoin transaction into the interpreter (EvalScript() specifically) that can be re-used? I can write it myself, but figured I would see if anyone has implemented the tx logic part that can just be reused
12:58 < Chris_Stewart_5> ideally easy to just cherry-pick
13:05 < Ademan> nvm polyD pointed me to it https://github.com/reardencode/bips/blob/bip-template-key/bip-template-key.mediawiki
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13:12 < instagibbs> Chris_Stewart_5 I presume elements did something reasonable to look at
13:23 < Chris_Stewart_5> instagibbs: Argh, I can't just keep copying the smart people over at the elements project! How will my reputation ever recover :P. Its a good idea i'll take a peek
13:31 < andytoshi> iirc the data we needed was already available because it's used by CHECKSIG
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13:31 < andytoshi> in elements actually one of the hardest things we did was putting the genesis blockhash into the taproot sighash (something that's useful for sidechains)
13:31 < andytoshi> since that data wasn't otherwise present anyhwere in the interpreter
13:44 < Chris_Stewart_5> andytoshi: I think you are right, it may just be a matter of making things less private: https://github.com/bitcoin/bitcoin/blob/5b8c5970bdfc817cac9b59f699925c4426c59b61/src/script/interpreter.h#L290
13:45 < Chris_Stewart_5> I thinking I was getting a little ahead of myself (I want to make modular components that build up to OP_TLUV), but strictly for IN_OUT_AMOUNT i don't believe we would require the whole tx
13:47 < andytoshi> Chris_Stewart_5: i'd look at the PrecomputedTransactionData constructor https://github.com/bitcoin/bitcoin/blob/5b8c5970bdfc817cac9b59f699925c4426c59b61/src/script/interpreter.h#L153
13:47 < andytoshi> rather than exposing stuff from the signaturechecker, just add fields to the PrecomputedTransactionData object
13:48 < andytoshi> in the PTD constructor you have access to the original transaction so you can copy whatever fields/sums you want out of there and just store them
13:48 < Chris_Stewart_5> thanks for the tip!
13:50 < andytoshi> in EvalScript you are given a `checker` argument ... checker.txdata is the PrecomputedTransactionData
13:50 < andytoshi> (#bitcoin-core-dev may be a better place to ask this kinda stuff. but this is the approach i'd take)
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