--- Log opened Tue Mar 08 00:00:19 2022
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03:49 < jeremyrubin> sipa: how would one satisfy the script "(0x50) equal if pk checksig else pk2 checksig endif"
03:50 < jeremyrubin> Err prefix that with DEPTH ROLL 
03:52 < jeremyrubin> Basically seems like if your script requires 0x50 you would need to pass some annex in in addition to 0x50, but because annex is non standard...
03:52 < jeremyrubin> This script is unspendable by standard rules 
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07:28 < roconnor_> I'm not following.  The annex appears before the redeem script in the witness stack.
07:28 < roconnor_> it is popped off if it exists.
07:28 < roconnor_> The thing that you cannot do is begin a redeem script with 0x50.
07:29 < roconnor_> which is OP_RESERVED.
07:45 < roconnor_> Er correction
07:45 < roconnor_> What isn't allowed is a tapleaf version of 0x50
07:47 < jeremyrubin> ah
07:47 < jeremyrubin> the spec in the BIP is not clear
07:47 < jeremyrubin> it should be revised :)
07:47 < jeremyrubin> "If there are at least two witness elements, and the first byte of the last element is 0x50[4], this last element is called annex a[5]"
07:47 < roconnor_> Seems to use "last" to mean "top".
07:47 < jeremyrubin> should read: "If there are at least two witness elements, and the first byte of the element on top of the stack is 0x50[4], this last element is called annex a[5"
07:50 < roconnor_> still, I'm left curious about the key spend path...
07:52 < roconnor_> oh it is the back of the stack where the annex is
07:52 < roconnor_> ugh.
07:52 < roconnor_> I see now.
07:53 < roconnor_> For tapscript spending the stack looks like, starting from the bottom [optional annex][control block][redeemscript][[witness stack items]](top of the witness stack here)
07:54 < roconnor_> and for keyspend the stack looks like [optional annex][signature].
07:55 < roconnor_> so 1 item is a keyspend signature.
07:56 < roconnor_> 2 items is keyspend with annex if the bottom of the stack starts with 0x50, and is a tapscript spend otherwise (where the redeem script is run on an empty witness stack).
08:00 < jeremyrubin> wait i thought it's vice versa?
08:00 < jeremyrubin> Annex is top of stack alwasy?
08:00 < roconnor_> const valtype& annex = SpanPopBack(stack);
08:01 < jeremyrubin> yes PopBack pops the top
08:01 < jeremyrubin> https://github.com/bitcoin/bitcoin/blob/b07fdd7f9eef5f1498af056f3ef11e44795578c0/src/script/interpreter.cpp#L1923
08:01 < jeremyrubin> back of a span is the top of a stack
08:02 < jeremyrubin> and the back of a stack is the front of a span, but sometimes we call it the back of the stack for "reasons" unknown.
08:02 < roconnor_> is it?
08:02 < jeremyrubin> This is all confusing so we should make terminology more clear lest we make bugs haha
08:04 < jeremyrubin> if you asked me yesterday where the annex is i would have said "the element that requires the most pops to get it off the stack"
08:04 < jeremyrubin> (not exactly, but that's unambiguous)
08:04 < jeremyrubin> i'm sure i must have known it was actually the top at some point...
08:05 < roconnor_> idk.  Stacks clearly have a top and bottom.
08:05 < jeremyrubin> and the top is the back / last clearly?
08:05 < roconnor_> that is less clear. :)
08:06 < roconnor_> I agree the current wording using "last" is unclear, and should stick to using "top".
08:06 < roconnor_> assuming it is the top of the stack like you say.
08:06 < jeremyrubin> are we still not in agreement with where the annex lives?
08:07 < roconnor_> no I think you are probably right.
08:07 < roconnor_> I just haven't verified it myself.
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08:49 < roconnor_> okay popstack is implement via pop_back, so yes the back of a vector/span is the top.
08:50 < roconnor_> so the annex is on top, followed by either the control block then redeem script, or a keyspend signature.
08:55 < sanket1729> Yep, I always thought it was for script spend
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11:55 < jeremyrubin> ctv meeting in 5 minutes, ##ctv-bip-review
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17:42 < jamesob> when doing bitcoin crypto stuff, should I basically always default to big endian unless it's a known special case (e.g. txids)?
17:43 < roconnor_> nearly everything in Bitcoin's serialization structures is little endian.
17:44 < roconnor_> The few exceptions are when things are taken from other standards like ECDSA signatures and, arguably, sha-256.
17:45 < jamesob> e.g. when going bytes -> int to generate privkey secrets from entropy... does endianness even matter there?
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17:47 < roconnor_> Apparently I'm supposed to tell people not to roll their own crypto.
17:48 < jamesob> some people have to learn the hard way
17:50 < roconnor_> The conversion of random bytes to a scalar value, which are the type of values used for private keys, technically has no endianess concern because the byte reversal of a suitably long random string is equally as random.
17:50 < jamesob> right, that's what I figured
18:02 < jamesob>     thanks roconnor_, I won't blame you when I shoot myself in the foot
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--- Log closed Wed Mar 09 00:00:20 2022