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63 2017-01-20T06:03:02 <cluelessperson> Hey guys, can I get thoughts on this?
64 2017-01-20T06:03:03 <cluelessperson> https://github.com/cluelessperson/bitcoin_key_tools/blob/master/keys.py
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202 2017-01-20T17:42:02 <cluelessperson> hey guys
203 2017-01-20T17:42:13 <cluelessperson> can I get thoughts on this? https://github.com/cluelessperson/bitcoin_key_tools/blob/master/keys.py
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205 2017-01-20T17:46:10 <arubi> cluelessperson, no check if 'public_bytes' in public_address() are actually a valid pubkey? :)
206 2017-01-20T17:46:35 <cluelessperson> arubi, it's a ecdsa public key, does it have a check mechanism?
207 2017-01-20T17:47:00 <arubi> it could be anything anyone passes in there, yes it should be a valid point on the curve
208 2017-01-20T17:47:09 <arubi> and be of specific format
209 2017-01-20T17:47:24 <cluelessperson> arubi, supposed to be a public key in bytes. :)
210 2017-01-20T17:47:43 <arubi> I know what it's /supposed/ to be :)
211 2017-01-20T17:48:02 <cluelessperson> arubi, when I say "public key" I don't mean a bitcoin hex public key, I mean it's the raw bytes
212 2017-01-20T17:48:30 <arubi> it still should be a valid pubkey
213 2017-01-20T17:48:51 <arubi> and public_address() will return a valid address for an invalid pubkey if checks are not made
214 2017-01-20T17:49:09 <arubi> so anyone who sends anything to that kind of address is really sending money to the void
215 2017-01-20T17:50:13 <arubi> python-ecdsa probably has a "isPoint()" check?
216 2017-01-20T17:50:59 <arubi> contains_point(self, x, y)
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229 2017-01-20T19:07:13 <bsm117532> Can someone remind me why we use hash(pubkey) for addresses rather than just pubkeys? What could go wrong if someone knew one of my pubkeys before I spent coin with it?
230 2017-01-20T19:07:41 <bsm117532> (I'm assuming pubkeys that are not related by HD key derivation FWIW)
231 2017-01-20T19:07:56 <abpa> Quantum computers could start to work on creating a false signature
232 2017-01-20T19:08:27 <bsm117532> Unicorns aside...what could actually go wrong?
233 2017-01-20T19:08:40 <abpa> Originally there were long uncompressed pubkeys that were thought to be unsuitable because of the data burden in scriptPubs and in addresses
234 2017-01-20T19:09:00 <abpa> Even compressed, a pubkey is 33 bytes vs a 20 byte hash
235 2017-01-20T19:09:21 <abpa> The idea is to keep scriptPubs small and scriptSigs big
236 2017-01-20T19:09:56 <bsm117532> Sure. That can't be the only reason though?
237 2017-01-20T19:10:17 <abpa> You have to keep scriptPubs around until they are spent, scriptSigs can be thrown away. If you are sent money you want to make it cheap for the person sending to you and expensive for you
238 2017-01-20T19:10:23 <bsm117532> Actually I see a way to do what I want to do without revealing the pubkey...
239 2017-01-20T19:10:46 <abpa> There's no major problem to using pubkeys, a lot of mining pools continued to do it in their coinbases for a long time
240 2017-01-20T19:11:03 <bsm117532> IIRC the argument centered around privacy...
241 2017-01-20T19:11:40 <abpa> There's an argument against re-using a keypair that is privacy related, and this reveals your public key
242 2017-01-20T19:12:16 <abpa> A new key pair should be used for each transaction to keep them from being linked to a common owner was the advice from the start
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261 2017-01-20T20:54:20 <cluelessperson> arubi, I'll see about checking a public key
262 2017-01-20T20:54:57 <cluelessperson> Now I need to make bitcoin key tools for arduino. :)
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