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In particular https://bitcoinops.org/en/topics/op_checksigfromstack/#transaction-introspection says "This makes it possible to put a validated copy of the spending transaction on the script evaluation stack where other opcodes can run tests on 10:49 < Ademan_> it in order to enforce restrictions on the spending transaction." but without CAT or SPLIT I really don't see/understand how you perform introspection here. Isn't "poelstra's trick" https://medium.com/blockstream/cat-and-schnorr-tricks-i-faf1b59bd298 exactly as powerful as CSFS+CHECKSIG ? 11:03 < andytoshi> Ademan_: you can do a limited form of introspection i think ... you use CHECKSIG and CSFS on the same sig 11:03 < andytoshi> if CHECKSIG passes, it was a valid sig on the transaction data. and if CSFS passes then you must've passed that same data, explicitly, to it 11:03 < andytoshi> now 11:03 < andytoshi> without CAT, then at best you can just get a hash of the transaction data, which has limited use.. 11:04 < andytoshi> but you can probably do -something- with it 11:04 < andytoshi> you could do colliderscript on it to break it into 4-byte chunks :P 11:06 < andytoshi> i guess that gains you very little vs just using normal colliderscript without CSFS 11:09 < Ademan_> "without CAT, then at best you can just get a hash of the transaction data" which is also what we get from poelstra's trick isn't it (without CAT)? 11:09 < Ademan_> admittedly I've ignored colliderscript because it's probably too big-brained for me :x 11:19 < andytoshi> no, without CAT i think poelstra's trick just doesn't work at all 11:19 < andytoshi> well 11:19 < andytoshi> you can't split the signature up to enforce R = G 11:20 < andytoshi> or to make either part of it be comparable to a 32-byte hash 11:20 < andytoshi> and i think that makes it completely useless (not just "limited to only some trivial cases) 11:20 < Ademan_> ah good point, that's what I get for not rereading it before citing it heh 11:20 -!- gf2718 [~gf2718@109.236.62.187] has quit [Ping timeout: 264 seconds] 11:20 -!- itsarjn [~itsarjn@user/itsarjn] has quit [Remote host closed the connection] 11:36 -!- itsarjn [~itsarjn@user/itsarjn] has joined #bitcoin-wizards 11:41 -!- itsarjn [~itsarjn@user/itsarjn] has quit [Ping timeout: 246 seconds] 11:54 -!- gf2718 [~gf2718@109.236.62.186] has joined #bitcoin-wizards 12:09 -!- itsarjn [~itsarjn@user/itsarjn] has joined 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