--- Log opened Wed Nov 21 00:00:09 2018
--- Day changed Wed Nov 21 2018
00:00 < arubi> re: Safer sighashes and more granular SIGHASH_NOINPUT , sighash_scriptmask\op_mask is really cool.  just need clarification on "for every OP_MASK in scriptCode the subsequent opcode/push is removed", does this mean "MASK 0x20 <pubkey>" removes both 0x20 and <pubkey>?
00:00 < arubi> also if I understand the current spec correctly, a script like "MASK 1 0x20 <pubkey> CHECKSIG" will sign the same scriptcode as "MASK MASK 1 0x20 <pubkey> CHECKSIG" I think?  not sure if it matters but it's an interesting edge case
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00:06 < sipa> arubi: i meant only the immediately following opcode
00:07 < sipa> and thinking more about it, i think MASK should require the next opcode to be a push - otherwise you can substitute a push for a non-push opcode, changing script semantics entirely
00:07 < sipa> that would outlaw mask mask
00:10 < arubi> I agree with only allowing masking of push ops.  don't see a use for masking other opcodes
00:11 < sipa> there may be a use for masking a variable number of pushes, such as the inputs to a CHECKMULTISIG, where the count isn't known or so
00:11 < sipa> but that seems pretty excentric already
00:13 < arubi> oh yea I see what you mean.  it does :)
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02:34 < serejandmyself> hey!
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08:43 < cjd> Question: Is it possible to make a ring/threshold pubkey and signature which validates using plain old sig validation code ?
08:47 < sipa> cjd: it depends what setup is acceptable
08:48 < cjd> Trying to settle a discussion about whether or not you can make an x509 cert that any old browser would accept but using a ring/threshold to sign with it
08:48 < cjd> (neither of us know the answer and googling it doesn't seem to be super helpful)
08:48 < sipa> if what you want to do is "given a number of public keys P1, P2, P3, ..., i want to be able to construct a combined public key which any k-of-n threshold of the originals can sign for", i believe it is onoy possible for n-of-n
08:49 < cjd> only possible for n-of-n, thanks
08:49 < sipa> if you permit the individual keyholders to first interact and store artefacts of that interaction, anything is probably possible
08:50 < sarang> Yes, it can be done for the threshold case with interaction
08:50 < sipa> threshold ecdsa and threshold schnorr both exist
08:50 < cjd> ahh, cool
08:51 < sipa> with ecdsa this is certainly nontrivial though
08:51 < sipa> and schnorr isn't used in certificates afaik
08:51 < sipa> with rsa i believe multiparty constructions exist too
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10:05 < andytoshi> fwiw you can literally share a private key if you want 1-of-n
10:05 < andytoshi> naturally this does not work with preexisting keys, gives you no possibility of accountability, etc
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11:48 < wallet42> https://tickets.events.ccc.de/35c3/ <-- last batch of tickets in 12 minutes. we'll have a bitcoin table there like every year since 2013. hope to see a lot of you!
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--- Log closed Thu Nov 22 00:00:28 2018