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136 2017-10-14T12:44:26 <shmoon> I have a question regarding https://bitcoin.org/en/developer-guide#pubkey - Is it referring to the fact that in txn outputs public key (derived from private key) isn't directly used because it is insecure but instead a public key hash is used (derived from public key, as specific in the P2PKH section) ?
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138 2017-10-14T12:50:06 <esotericnonsense> shmoon: yep
139 2017-10-14T12:50:36 <esotericnonsense> shmoon: 'insecure' is an exaggeration, less secure is more accurate
140 2017-10-14T12:51:32 <shmoon> esotericnonsense: In that case I have 2 follow up questions, 1. Howcome multisig as defined here https://bitcoin.org/en/developer-guide#multisig use public keys then and not public key hashes ? and 2. How are public key insecure and public key hash which is derived form the same piece of data, i.e., public key, secure ?
141 2017-10-14T12:51:44 <shmoon> infact if you see the first example under multi sig that's pretty much a P2PKH transaction but instead of using key hashes its using the key itself.
142 2017-10-14T12:52:09 <esotericnonsense> shmoon: notice 'Although P2SH multisig is now generally used for multisig transactions'
143 2017-10-14T12:52:57 <shmoon> the P2SH multisig also uses public keys not hashes :D
144 2017-10-14T12:53:23 <esotericnonsense> yes but the pubkeys are not revealed until the spending/scriptsig stage
145 2017-10-14T12:53:33 <esotericnonsense> (as is also true for single p2pkh)
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147 2017-10-14T12:55:17 <esotericnonsense> you can think of p2pkh as sort of being a special case of p2sh
148 2017-10-14T12:55:28 <esotericnonsense> it precedes the introduction of p2sh
149 2017-10-14T12:55:37 <shmoon> no they are revealed in the pubkey script stage (output of previosu transaction) ?
150 2017-10-14T12:56:28 <esotericnonsense> shmoon: a p2sh outputs's scriptpubkey is op_hash160 hash op_equal
151 2017-10-14T12:56:33 <shmoon> The `Pubkey script` or `Redeem script` in multisig of P2SH or the simple one has the public key
152 2017-10-14T12:56:46 <esotericnonsense> shmoon: yeah that's not the p2sh multisig that's bare multisig
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154 2017-10-14T12:57:14 <esotericnonsense> the redeem script p2sh one is not revealed until spending
155 2017-10-14T12:57:24 <esotericnonsense> only the hash is in the pubkey script
156 2017-10-14T12:58:58 <esotericnonsense> the sigscript for p2sh looks like 'rest of sig script' 'push redeem script'; the sigscript actually contains the redeem script
157 2017-10-14T12:59:04 <shmoon> you mean redeem script (that contains public key) is with signature script only - part of input of the transaction that spends the UTXO ?
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159 2017-10-14T12:59:39 <esotericnonsense> yes, it's split into three (pubkey script, redeem script, signature script) because the redeem script is pushed as part of the sigscript, not just concatenated
160 2017-10-14T13:00:44 <esotericnonsense> it's just more readable that way I think rather than having sigscript say something like OP_0 <A sig> <C sig> < OP_2 <A pubkey> .... > and having nested pushes
161 2017-10-14T13:00:46 <shmoon> oh I though redeem was pushed with scriptpubkey
162 2017-10-14T13:00:52 <esotericnonsense> nope, just the hash
163 2017-10-14T13:01:51 <shmoon> ah got it now, maybe the documentation can be changed in that case. would make it less readable but more understandable!
164 2017-10-14T13:02:19 <shmoon> but still why not use pubhash instead of pubkey and save on space! :)
165 2017-10-14T13:06:35 <esotericnonsense> shmoon: it wouldn't save space because you'd have to give the pubkey with the signature
166 2017-10-14T13:06:53 <esotericnonsense> shmoon: notice that in the bare multisig case there the sigscript only contains sigs and not sig + pubkey
167 2017-10-14T13:08:22 <esotericnonsense> shmoon: p2sh already provides security of the pubkeys prior to spending because all that's in the chain (e.g. the p2sh address) is a hash of the redeem script
168 2017-10-14T13:08:41 <esotericnonsense> so you'd be hashing some hashes
169 2017-10-14T13:08:46 * esotericnonsense has to wander off for a bit
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184 2017-10-14T14:15:30 <camarads> hey guys. is there any way to see the ancestors or descendants of a txid using bitcoind rpc api ?
185 2017-10-14T14:15:49 <camarads> the tx id's are generated by me.
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209 2017-10-14T17:18:15 <ZiNC> Hey.
210 2017-10-14T17:20:27 <ZiNC> I'm trying to understand a few tech details, though from an end-user perspective. I hope the #'s right place.
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215 2017-10-14T17:55:52 <Sentineo> ZiNC: #bitcoin is mutch better suited for you then, please ask there
216 2017-10-14T17:56:53 <ZiNC> No luck so far, but alright.
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223 2017-10-14T18:47:59 <shmoon> esotericnonsense: thanks that was helpful :)
224 2017-10-14T19:02:37 <shmoon> esotericnonsense: still around ?
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229 2017-10-14T19:32:46 <camarads> hey guys. does somebody know the bitcoind cmd to list all the unconfirmed transactions from my wallet ?
230 2017-10-14T19:39:25 <arubi> bitcoin-cli listunspent 0 0 ?
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235 2017-10-14T19:50:27 <shmoon> Trying to understand https://bitcoin.org/en/developer-guide#null-data - my understanding is these are empty transactions without any inputs and only outputs which contain amounts as 0 and pubkey as OP_RETURN 83 bytes data. Idea is to be able to store random data inside the block that can be used for some specific bookkeeping purpose. Is my understanding correct ?
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237 2017-10-14T19:50:54 <shmoon> the guide also says they can be automaticlaly pruned, not sure if I understand the meaning of that. Can somebody explain that as well.
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239 2017-10-14T19:58:26 <camarads> arubi nope, that is the unspent transactions, i want the entire list of unconfirmed transactions from my wallet
240 2017-10-14T19:59:39 <arubi> that should give you unspent outputs in your wallet that have zero confirmations I think
241 2017-10-14T20:00:26 <camarads> i need all my unconfirmed transactions, not only the unspent outputs
242 2017-10-14T20:01:22 <arubi> you you mean outbound
243 2017-10-14T20:01:58 <camarads> don't know the term outbound , sorry :|
244 2017-10-14T20:02:12 <arubi> you mean unconfirmed transactions that you sent?
245 2017-10-14T20:02:18 <camarads> yes
246 2017-10-14T20:03:13 <arubi> bitcoin-cli listtransactions | grep -A1 'confirmations": 0,'
247 2017-10-14T20:04:05 <camarads> nope. it shows 10 lines
248 2017-10-14T20:04:12 <camarads> i have more than that unconfirmed
249 2017-10-14T20:05:02 <arubi> not sure, that's a list of transactions in your wallet with 0 confirmations
250 2017-10-14T20:05:41 <camarads> i've read the help file but didn't find
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267 2017-10-14T22:33:46 <iwkse> hi, I was going to sync the blockchain and I get a segfault running the core, https://pastebin.com/536YyKVe
268 2017-10-14T22:34:26 <iwkse> datadir is on an external usb disk
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