#bitcoin-wizards on 2017-06-03 — irc logs at freenode.irclog.whitequark.org

2015-10-30 00:53 sipa changed the topic of #bitcoin-wizards to: This channel is for discussing theoretical ideas with regard to cryptocurrencies, not about short-term Bitcoin development | http://bitcoin.ninja/ | This channel is logged. | For logs and more information, visit http://bitcoin.ninja

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01:02 <adiabat> hi wizards, I have a smart contract idea I wrote up here: https://adiabat.github.io/dlc.pdf

01:02 <adiabat> would welcome feedback, especially of the "oh no this construction is horribly broken" variety

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04:03 <kanzure> adiabat: not related to your construction, (in fact this sadly uses sgx) http://diyhpl.us/~bryan/papers2/bitcoin/Town%20Crier:%20An%20authenticated%20data%20feed%20for%20smart%20contracts.pdf

04:09 <kanzure> adiabat: on page 5 last paragraph, the transactions are valid (broadcastable?) even though the transaction doesn't contain the oracle's signature?

04:09 <adiabat> kanzure: yeah, you can broadcast them, but it's a bad idea to do so

04:09 <adiabat> you don't know the private key that they send to, so you won't get any coins by broadcasting the "wrong" transaction

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04:21 <kanzure> adiabat: oh it's valid and broadcastable because alice and bob actually have to publish two transactions in the bitter regretful trade case; their scripthash outputs should only be sent once the oracle's signature is known. and then in non-adversarial average case, alice and bob should agree to skip those two transactions and forego their umpteen-million pre-signed transactions. is all of ...

04:22 <kanzure> ...this correct?

04:23 <kanzure> and the two transactions would be: one of the pre-signed transactions creating the scripthash output, and then one that spends the scripthash once the oracle reveals a value.

04:23 <kanzure> *and then one that spends the scripthash output

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05:09 <adiabat> kanzure: right; if they cooperate they don't need all the pre-signed transactions

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05:11 <kanzure> what is the actual value of the scripthash, and could fancypants opcodes make better conditionals? i guess some sort of checksnorr tree.

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05:53 <adiabat> the script itself is (keyA OR (keyB AND op_csv))

05:54 <adiabat> the opcodes are here: https://github.com/mit-dci/lit/blob/master/lnutil/lnlib.go#L12

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07:40 <waxwing> adiabat: in "Transactions within the contract", the first two scriptpubkeys shown have A_i and B_i everywhere, but reading the rest of the page i'm thinking it should be B not B_i in the first, and A not A_i in the second?

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15:40 <stevenroose> Can someone explain me the rationale of BIP65's CLTV failed if "the nSequence field of the txin is 0xffffffff;"?

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16:04 <sipa> stevenroose: traditionally there has been a rule that if all txin's are 0xff..ff, the transaction is final, regardless of what the locktime sats

16:05 <stevenroose> so it's to make sure that when you submit an eventually-valid txn, you can still replace it with another one?

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16:26 <a87ry5> adiabat: thanks for the paper :)

16:27 <a87ry5> exactly what i was looking for, our discussions helped me a lot

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