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106 2018-04-19T07:18:07 <nightcat> hello.. I was going through recreating the process of address creation for learning and understanding sake.. I was looking at this https://en.bitcoin.it/wiki/Technical_background_of_version_1_Bitcoin_addresses trying to follow steps in How to create bitcoin address.. I started by generating a private key with `openssl ecparam -genkey -name secp256r1..`
107 2018-04-19T07:18:33 <nightcat> then created a corresponding public key in the form of an x509 cert
108 2018-04-19T07:19:01 <nightcat> step 1 says Take the corresponding public key generated with it (65 bytes, 1 byte 0x04, 32 bytes corresponding to X coordinate, 32 bytes corresponding to Y coordinate)
109 2018-04-19T07:19:23 <nightcat> but my public key coords don't seem to match these bitlenght constraint
110 2018-04-19T07:19:30 <nightcat> am i on right tracks or not?
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113 2018-04-19T07:27:07 <luke-jr> nightcat: pretty sure secp256k1 is not secp256r1
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116 2018-04-19T07:28:42 <nightcat> oh it was secp256k1
117 2018-04-19T07:28:46 <nightcat> thanks luke-jr
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121 2018-04-19T07:57:58 <nightcat> I generated another keypair with secp256k1.. luke-jr you know how to get x and y coords from this?
122 2018-04-19T07:58:00 <nightcat> -----BEGIN PUBLIC KEY-----
123 2018-04-19T07:58:00 <nightcat> MIH1MIGuBgcqhkjOPQIBMIGiAgEBMCwGByqGSM49AQECIQD/////////////////
124 2018-04-19T07:58:00 <nightcat> //////////////////+///8LzAGBAEABAEHBEEEeb5mfvncu6xVoGKVzocLBwKb
125 2018-04-19T07:58:00 <nightcat> AP////////////////////66rtzmr0igO7/SXozQNkFBAgEBA0IABMLCg6ktbJd6
126 2018-04-19T07:58:01 <nightcat> 4fBsnZNPV+opaKvah0apa8yjsi7WbOfqDGOGk+rxnOioKse3S2zG2ILktFfwMt25
127 2018-04-19T07:58:03 <nightcat> pWUDg9QLhpc=
128 2018-04-19T07:58:05 <nightcat> -----END PUBLIC KEY-----
129 2018-04-19T07:58:08 <luke-jr> nope
130 2018-04-19T07:58:34 <luke-jr> btw, the instructions on that page are semi-wrong
131 2018-04-19T07:59:01 <nightcat> I see.. you can suggest something better?
132 2018-04-19T07:59:13 <luke-jr> Bitcoin Core source code maybe?
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136 2018-04-19T08:02:18 <bedotech> hi all! i want to build a online service that generate address from extended public key, is better to use backward compatibility P2SH-P2WPKH or i can use direct P2WPKH?
137 2018-04-19T08:05:16 <luke-jr> nightcat: semi-updated it
138 2018-04-19T08:06:03 <luke-jr> bedotech: don't ask users to put information like that into webpages..
139 2018-04-19T08:06:35 <nightcat> I see.. so it's just the X coord now
140 2018-04-19T08:06:48 <nightcat> anyway i think I got it
141 2018-04-19T08:06:49 <luke-jr> bedotech: if you mean your own.. order of preference should probably be p2pkh, p2wpkh, p2sh-p2wpkh
142 2018-04-19T08:07:04 <luke-jr> nightcat: the prefix byte is 03 instead of 04 also
143 2018-04-19T08:07:36 <luke-jr> bedotech: but inevitably, what you do needs to conform to what your wallet expects
144 2018-04-19T08:08:25 <nightcat> parsing the pubkey with openssl x509 -in device.pem -noout -pubkey openssl asn1parse i get this http://sprunge.us/EJab
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146 2018-04-19T08:08:33 <bedotech> luke-jr: yep the key are stored in my backed server, i generate address to make payment to my service, so i think is better p2sh-p2wpkh so the fee are limited and the old wallet can send payments to me
147 2018-04-19T08:09:09 <luke-jr> bedotech: find out what your wallet supports; you can't just use whatever ;)
148 2018-04-19T08:09:51 <nightcat> if it was still 65 byte I guess it would be the 75 field
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150 2018-04-19T08:10:00 <luke-jr> bedotech: old wallets can send payments to p2pkh too, btw. and they're better for the network.
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152 2018-04-19T08:10:56 <luke-jr> nightcat: probably. so just change the 04 to 03, and cut off the last 32 bytes
153 2018-04-19T08:10:57 <luke-jr> nightcat: before using, test with testnet ;)
154 2018-04-19T08:11:48 <nightcat> yea sure
155 2018-04-19T08:11:54 <nightcat> thanks a lot
156 2018-04-19T08:12:38 <bedotech> luke-jr: you have some reference wallet for this use? because i think for generate address in secure manner is better to use library that load only extended pubkeys, i see pycoin and bitcoinjs-lib
157 2018-04-19T08:13:37 <bedotech> because i need to generate really a lot of address
158 2018-04-19T08:15:00 <luke-jr> bedotech: no, I don't
159 2018-04-19T08:15:18 <luke-jr> personally, I would just upload addresses into a database, not derive them
160 2018-04-19T08:16:20 <bedotech> luke-jr: yeah you are right, but if you do so you always need to ask a 'remote' wallet and backup the wallet and you database.
161 2018-04-19T08:16:40 <bedotech> for mantain user-address couple
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164 2018-04-19T08:19:52 <luke-jr> bedotech: you always need to backup that anyway, or you don't have customer info
165 2018-04-19T08:20:04 <luke-jr> and don't ask the remote wallet; have the remote wallet push it
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192 2018-04-19T09:36:58 <nightcat> luke-jr, concerning step 0.. that is the X coord of the privkey?
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235 2018-04-19T12:56:26 <plorark> Hey guys
236 2018-04-19T12:56:37 <plorark> wasup
237 2018-04-19T12:57:40 <plorark> I'm looking for a js library to build a full wallet in nodejs (electron and stuff) for a bitcoin fork, but I can't find something good
238 2018-04-19T12:57:55 <plorark> I've tried bitcore, but it so hard to change the network
239 2018-04-19T12:58:05 <plorark> it just keep conecting to thhe default one
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298 2018-04-19T15:59:08 <fluffypony> unfortunately there's no shitcoin support here
299 2018-04-19T15:59:15 <fluffypony> oh they left already
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337 2018-04-19T18:33:44 <robzon> I'm trying to figure out how bitcoin core handles chain reorgs with regards to the chain state database... if we're at height X (and the db reflects the state at that height) and I need to reorg at height X-Y, how does core roll back the db to the state at height X-Y? are there snapshots every now and then? is there a limit on how big Y can be?
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343 2018-04-19T18:56:42 <jonasschnelli> robzon: bitcoin core keeps those "undo" files
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346 2018-04-19T18:58:44 <jonasschnelli> robzon: check CChainState::DisconnectBlock() in Cores source code
347 2018-04-19T19:06:41 <robzon> jonasschnelli: exactly what I was looking for, thanks!
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