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  4 2017-08-10T00:18:11  <jimpo> Not sure who usually reviews bitcoin.org pull requests, but I would appreciate a review for correctness on https://github.com/bitcoin-dot-org/bitcoin.org/pull/1740
  5 2017-08-10T00:20:01  <wbnns> @jimpo Hey, thanks - we'll check it out.
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105 2017-08-10T11:14:09  <JackH> there is no RPC for the p2wsh in core yet, right?
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132 2017-08-10T14:36:50  <stevenroose> according to the wiki here
133 2017-08-10T14:36:52  <stevenroose> https://en.bitcoin.it/wiki/Script#Constants
134 2017-08-10T14:37:10  <stevenroose> OP_0 doesn't push 0 on the stack like OP_1-OP_16
135 2017-08-10T14:37:26  <stevenroose> "An empty array of bytes is pushed onto the stack. (This is not a no-op: an item is added to the stack.)"
136 2017-08-10T14:38:00  <stevenroose> same for OP_FALSE
137 2017-08-10T14:38:26  <stevenroose> does an empty item on the stack count as "false" for OP_IF?
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140 2017-08-10T14:44:09  <Chris_Stewart_5> stevenroose: Yes. IIRC any item that is *NOT* OP_1/OP_TRUE counts as false
141 2017-08-10T14:44:56  <stevenroose> Chris_Stewart_5: thanks. kinda weird that OP_0 doesnt put a 0 on the stack, but well
142 2017-08-10T14:45:20  <Chris_Stewart_5> Hah, yes it took me a while to grasp that. Let me double check the OP_1/OP_TRUE thing though.
143 2017-08-10T14:46:52  <Chris_Stewart_5> stevenroose: So here is how a bool is evaluated in Script https://github.com/bitcoin/bitcoin/blob/8c1dbc5e9ddbafb77e60e8c4e6eb275a3a76ac12/src/script/interpreter.cpp#L38
144 2017-08-10T14:47:27  <Chris_Stewart_5> I was wrong by the looks of it wrt to the OP_1/OP_TRUE thing
145 2017-08-10T14:48:39  <Chris_Stewart_5> and I guess that was a tangent to your original question any way :-)
146 2017-08-10T14:52:12  <stevenroose> Chris_Stewart_5: is this channel usually active? didn't want to ask in -wizards
147 2017-08-10T14:55:23  <Chris_Stewart_5> stevenroose: Eh, it's really hit or miss depending on the time zone. There are a few active contributors in here tho
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149 2017-08-10T14:57:48  <stevenroose> good, I'll wait
150 2017-08-10T15:06:16  <Chris_Stewart_5> the answer to your question is yes, an empty item on the stack counts as false. see code i linked to
151 2017-08-10T15:06:38  <stevenroose> oh, thanks,looked over the link
152 2017-08-10T15:06:42  <stevenroose> I assumed so though
153 2017-08-10T15:07:10  <stevenroose> Chris_Stewart_5: many thanks :)
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157 2017-08-10T15:22:45  <dgenr8> Is there code out there that uses N UTXO snapshots to parallelize full blockchain validation (by making considering later chunk success conditional on validation of earlier chunks)?
158 2017-08-10T15:24:14  <dgenr8> You'd want to include unspendable UTXO's
159 2017-08-10T15:36:43  <Chris_Stewart_5> dgenr8: Not sure, what is the benefit of this compared to just syncing sequentially?
160 2017-08-10T15:37:23  <Chris_Stewart_5> and parrellizing the validation of txs instead of the validation of individual utxo states
161 2017-08-10T15:37:40  <Chris_Stewart_5> seems better to me
162 2017-08-10T15:43:08  <dgenr8> You can't parallelize validation of txes because each tx is potentially dependent on previous tx
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164 2017-08-10T15:49:07  <Chris_Stewart_5> dgenr8: And why wouldn't that same arguement apply to UTXOs? UTXO validation *is* tx validation
165 2017-08-10T15:49:15  <Chris_Stewart_5> I suppose I meant signature validation
166 2017-08-10T15:50:56  <dgenr8> Everything in chunk 2 can be validated with a snapshot as the starting point.  The result is subject to the condition that the snapshot is the end result of validating chunk 1.
167 2017-08-10T15:51:30  <Chris_Stewart_5> Sure, but why not just apply that logic on a tx level and save bandwidth?
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169 2017-08-10T15:53:08  <dgenr8> I think your suggestion may also be possible with some fancy improvements to CCoinsView etc to do efficient differential snapshots.  Hmm actually ... is it already there?
170 2017-08-10T15:53:30  <Chris_Stewart_5> Could be, might be better to ask in #bitcoin-core-dev
171 2017-08-10T15:54:28  <dgenr8> An advantage of my suggestion is that each thread only needs a sub-sequence of blocks
172 2017-08-10T15:55:10  <Chris_Stewart_5> what do you mean by sub seqeunce?
173 2017-08-10T15:55:17  <dgenr8> a segment of the chain
174 2017-08-10T15:55:45  <semidef> I have a question about SPV clients and detecting double spends ...
175 2017-08-10T15:55:47  <Chris_Stewart_5> ah. Is the overall goal you are trying to achieve faster IBD?
176 2017-08-10T15:55:54  <dgenr8> yes
177 2017-08-10T15:56:15  <semidef> My understanding is that the SPV client adds its own addresses to the bloom filter ...
178 2017-08-10T15:56:40  <dgenr8> also reindex
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180 2017-08-10T15:57:26  <semidef> When the SPV first syncs block headers, if it requests block data, it gets filtered blocks with merkle paths and tx data for relevant txs ...
181 2017-08-10T15:57:27  <Chris_Stewart_5> dgenr8: IIRC all blocks are downloaded to disk indepdendently of what point your tx validation is at so if your scheme is faster it would be plausible to do
182 2017-08-10T15:58:02  <dgenr8> i wondering if its been done before
183 2017-08-10T15:58:11  <Chris_Stewart_5> I would be interested in seeing what they say in #bitcoin-core-dev, try asking there.
184 2017-08-10T15:58:27  <semidef> Let's say the SPV is all sync'ed up. Later, a peer sends it a tx matched by the filter ...
185 2017-08-10T15:59:13  <semidef> The question: Is the SPV depending on the full node peer to not send it tx's that spend outputs not in the UTXO pool?
186 2017-08-10T16:00:03  <semidef> That is, it's not up to the SPV to somehow get the tx's that are used as inputs to the new tx, right, and check for double spends itself.
187 2017-08-10T16:00:21  <dgenr8> semidef: today, yes. about the most they do is make sure they get it from all peers
188 2017-08-10T16:00:55  <dgenr8> much more is possible
189 2017-08-10T16:02:58  <semidef> dgenr8: Thanks. It's not possible to request an arbitrary tx from the blockchain without issuing new getblocks and getdata requests, right? So it would be difficult to retrieve the inputs to the new tx.
190 2017-08-10T16:15:21  <dgenr8> semidef: it's not easy with the current protocol, but it's not rocket science. satoshi-derive fullnodes have optimized themselves away from this kind of thing (at one time every node had a txindex)
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193 2017-08-10T16:25:14  <semidef> If the protocol were modified to allow an SPV client to request an arbitrary confirmed tx by txid, would a modern satoshi-derrived full node be able to find it without txindex=1?
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209 2017-08-10T18:30:24  <corinrose_> any thoughts on the subspace messaging protocol? reasons it's not in use?
210 2017-08-10T18:36:37  <dgenr8> semidef: nope
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274 2017-08-10T23:30:35  <tachys_> can anyone explain in concrete terms what a witnessScript is?
275 2017-08-10T23:31:49  <tachys_> I'm trying to use bitcoinjs-lib to craft a P2WSH address, and it requires the witness script, however I can't tell what that is.
276 2017-08-10T23:33:28  <tachys_> from what I can tell, the redeemScript includes the SHA256(witnessScript)
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