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47 2017-12-26T02:51:28 <vinnix> https://gist.github.com/vinnix/dd6eea7ce5d938c752166d3faebd7663 (bitcoind running with valgrind result)
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137 2017-12-26T07:29:27 <weiyang> I am trying to use curl for experience the rpc method. Not sure which user/password should I try.
138 2017-12-26T07:29:27 <weiyang> the command I found looks like this: curl --user user --data-binary {jsonrpc: 1.0", id:curltest, method: getinfo, params: [] } -H content-type: text/plain; http://127.0.0.1:8332/
139 2017-12-26T07:29:27 <weiyang> And I replace the 127.0.0.1 with an address found on https://bitnodes.earn.com/nodes/?q=Satoshi:0.15.1, but prompt to input password. Hmm
I am not sure what should I do next
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142 2017-12-26T07:41:52 <DSidH> question re. segwit: "For receiving payments, the wallet must be able to create a P2SH address based on a P2WPKH script (defined hereinafter), and be able to recognize payment to such addresses."
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144 2017-12-26T07:41:57 <DSidH> from the docs.
145 2017-12-26T07:42:13 <DSidH> what does it mean "able to recognize payment to such addresses." ?
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152 2017-12-26T07:58:49 <arubi> able to watch the p2sh scriptpubkey for incoming payments and then solve the p2sh and p2wpkh to redeem
153 2017-12-26T07:59:26 <arubi> a lot of wallets watch just one script type for a pubkey. core watches a bunch by default and can be taught to watch more
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224 2017-12-26T12:16:09 <vinnix> it seems like leveldb has some memory leaks
225 2017-12-26T12:16:53 <vinnix> at least that is what I am observing when using "-reindex" (after reindexed and reading again all blocks)
226 2017-12-26T12:17:13 <vinnix> https://gist.github.com/vinnix/dd6eea7ce5d938c752166d3faebd7663 (bitcoind running with valgrind result)
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326 2017-12-26T19:00:46 <DSidH> arubi "a lot of wallets watch just one script type for a pubkey. core watches a bunch by default and can be taught to watch more"
327 2017-12-26T19:01:44 <DSidH> that would make sense if the only payment it expects is of that script type. So each wallet should watch for payments to all addresses it owns
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339 2017-12-26T19:36:45 <DSidH> arubi nvm I understand, someone can send to my P2PKH address once he knows my public key without me ever giving them the address, so I need to watch all address types
340 2017-12-26T19:40:56 <arubi> ah just caught the highlight. it all depends on how many scriptpubkey programs the wallet can solve by itself right
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342 2017-12-26T19:42:40 <arubi> so yes knowledge of a bare pubkey allows some person to send you coins to whichever script, but mostly you'll watch the standard scripts. core can pick up on bare scriptpubkeys where it knows the private key, so something like a 1-of-1 multisig with a pubkey of your would be picked up
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344 2017-12-26T19:43:54 <arubi> maybe it can pick up on multisigs with more keys if it knows privkeys for all pubkeys used, actually I haven't tried
345 2017-12-26T19:45:00 <arubi> basically you wouldn't expect someone to just randomly pay an address or script you didn't specifically give out to them, but knowing to watch for and solve the scripts is quite useful
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349 2017-12-26T20:05:07 <buffalobill33> If I want to write a bitcoin payment system for a site, what is the best way of doing it? Should I write my own wrapper for bitcoin RPC calls?
350 2017-12-26T20:07:22 <arubi> you could. just generate a huge keypool in the wallet first then call getnewaddress for payment addresses
351 2017-12-26T20:07:56 <arubi> but it's not easily used for multiple customers without more tools, maybe for donation addresses that's enough
352 2017-12-26T20:08:34 <buffalobill33> what would be the suggested way of designing such a system? One that could scale to say tens of thousands of users easily
353 2017-12-26T20:09:03 <arubi> not sure, sounds out of my reach
354 2017-12-26T20:09:21 <arubi> I mean, it sounds like a full fledged enterprise product right
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356 2017-12-26T20:14:17 <buffalobill33> The end product would be. The reason I ask is because experienced bitcoin developers with availability are hard to find, and I'm wondering how difficult it would be to develop the experience myself
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358 2017-12-26T20:16:41 <Randolf> buffalobill33: Well, you'll obviously need a good database to keep track of your users, and excellent security practices for handling passwords, 2FA, etc. Fortunately there are many high quality, free, and open source databases you could use (e.g., PostgreSQL.org is my favourite).
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361 2017-12-26T20:17:44 <Randolf> buffalobill33: You'd also need someone to develop the software for you. There are many options, and you can combine multiple languages together, but it would be smart to choose a language that your web server software has good support for (e.g., with Apache HTTPd there's mod_perl2, Python, Java
362 2017-12-26T20:17:44 <Randolf> Server Pages, PHP, etc.).
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364 2017-12-26T20:18:29 <Randolf> buffalobill33: I agree with arubi that you'd be developing something in the realm of a full-fledged enterprise product.
365 2017-12-26T20:18:53 <Randolf> buffalobill33: If I were to embark on such a project, I would hire a team of good developers to build it in-house.
366 2017-12-26T20:19:26 <arubi> and these are just the things that you'll need for just any major online service. add cryptocurrency to that and you have all the issues that come with that
367 2017-12-26T20:20:12 <arubi> mostly you'll see that no matter what technology services build on, they always end up getting hacked or lose a bunch of coins somehow
368 2017-12-26T20:20:47 <buffalobill33> Randolf: I have most of the backend developed (rails with postgres) with security features such as 2FA, tokens etc in addition to distributed locks and rabbitmq as a messaging system. I am looking to get people to help me develop the bitcoin functionality and want to get a rough idea of how much work needs to be done and how difficult it is conceptually
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370 2017-12-26T20:23:24 <buffalobill33> I plan on having a full third-party security audit at the end. How difficult is it for an experience programmer with a reasonably good conceptual knowledge of bitcoin to develop a backend api to process payments securely?
371 2017-12-26T20:24:40 <arubi> maybe look into btcpay, it's software for transaction clearance
372 2017-12-26T20:26:36 <arubi> many different results on google, https://github.com/btcpayserver/btcpayserver is what I mean
373 2017-12-26T20:26:49 <buffalobill33> thanks, having a look now
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375 2017-12-26T20:30:19 <DSidH> [01:13] <arubi> maybe it can pick up on multisigs with more keys if it knows privkeys for all pubkeys used, actually I haven't tried
376 2017-12-26T20:30:50 <DSidH> Hmmm I dont think its possible because core would need to know all pub keys used in the script.. else it won't know
377 2017-12-26T20:30:57 <buffalobill33> Right now I have an experience blockchain dev with a small team offering to build a btc and ethereum payment processing backend for $70k. Is this a reasonable price? How long would such a project normally take a team to do
378 2017-12-26T20:31:16 <DSidH> oops u said all
379 2017-12-26T20:31:21 <DSidH> I read some :P
380 2017-12-26T20:32:04 <echeveria> buffalobill33: if you're asking that question, you clearly haven't evaluated the risks in handling other people's money.
381 2017-12-26T20:32:36 <buffalobill33> echeveria: can you clarify that please?
382 2017-12-26T20:32:48 <DSidH> would core be able to handle say a million watch only addresses?
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384 2017-12-26T20:35:03 <echeveria> buffalobill33: you asked for an evaluation of cost for a system that handles other people's money, you should be able to answer that.
385 2017-12-26T20:35:24 <echeveria> DSidH: it's not designed for that. many things in the wallet are inefficient.
386 2017-12-26T20:39:01 <DSidH> echeveria: I see, so best would be to use bitcoind to get blocks and parse them myself
387 2017-12-26T20:39:01 <buffalobill33> echeveria: I don't know enough about the specifics of how a bitcoin node works to answer it correctly. I guess to rephrase the question: does it take 700 hours billable at $100/hour to write a btc payment processor which can send, receive and notify of incoming payments? The rest of the logic (coin selection, address tracking etc) will be written be a separate team.
388 2017-12-26T20:40:27 <DSidH> Can someone help in understanding the test vectors at https://bitcoin.stackexchange.com/a/22881/2075 ? The private key hex seems to be much larger (38 bytes)
389 2017-12-26T20:41:35 <DSidH> what encoding is the private key? Example: 79186670301299046436858412936420417076660923359050732094116068951337164773779
390 2017-12-26T20:41:46 <echeveria> .. integer.
391 2017-12-26T20:41:51 <arubi> it seems to be in decimals?
392 2017-12-26T20:41:56 <DSidH> is it just int? But its much larger than 256 bits
393 2017-12-26T20:42:30 <DSidH> also the op says "Private as hex "
394 2017-12-26T20:42:34 <arubi> ;;calc log(77359564092138606367423909782286964438584967790833203478204963256314910737690)/log(2)
395 2017-12-26T20:42:34 <gribble> 255.418114877
396 2017-12-26T20:42:52 <arubi> ;;calc log(23984934282846201135004307705980641080962872643161302353166056218330425914143)/log(2)
397 2017-12-26T20:42:52 <gribble> 253.728663698
398 2017-12-26T20:43:00 <arubi> all fine :)
399 2017-12-26T20:43:39 <DSidH> oh ok so he says hex but its not
400 2017-12-26T20:43:58 <echeveria> buffalobill33: I was saying that's a problem in itself. if you're handling other people's money you need to be able to independently evaluate that.
401 2017-12-26T20:44:19 <DSidH> thx. stupid thing, should have spotted myself.
402 2017-12-26T20:45:46 <DSidH> all tests pass.. so vectors are good
403 2017-12-26T20:45:52 <DSidH> these are some edge cases
404 2017-12-26T20:45:56 <arubi> nice
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408 2017-12-26T21:02:40 <arubi> ohh I just noticed you're doing recoverable sigs DSidH
409 2017-12-26T21:03:49 <arubi> DSidH, https://gist.github.com/fivepiece/4b5a026c6f74a47162fe1198e19838ee
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413 2017-12-26T21:05:50 <DSidH> arubi: which signatures are you referring to? In this post? https://bitcoin.stackexchange.com/a/22881/2075
414 2017-12-26T21:05:52 <arubi> there are usually 2 pubkeys and 4 addresses recoverable per signature, and sometimes it can be 4 pubkeys and 8 addresses, but only if the "signer" sets it on purpose :)
415 2017-12-26T21:06:12 <arubi> yea
416 2017-12-26T21:07:42 <DSidH> ok thats some other user but this is interesting fact
417 2017-12-26T21:08:06 <arubi> ah I see you were just using the numbers to test your output
418 2017-12-26T21:08:15 <DSidH> (s)he is not using deterministic ECDSA as the sigs dont match mine
419 2017-12-26T21:08:18 <DSidH> yup
420 2017-12-26T21:08:50 <DSidH> [02:35] <arubi> there are usually 2 pubkeys and 4 addresses recoverable per signature, and sometimes it can be 4 pubkeys and 8 addresses, but only if the "signer" sets it on purpose :)
421 2017-12-26T21:08:57 <DSidH> please give some more references/details
422 2017-12-26T21:09:17 <DSidH> key recovery is complex topic so I am not sure I'll get it
423 2017-12-26T21:09:52 <DSidH> How do I know they are recoverable sigs?
424 2017-12-26T21:09:54 <arubi> in core there's a feature called "signmessage"
425 2017-12-26T21:10:17 <arubi> where you sign some text message and send the verifier your address and that message
426 2017-12-26T21:10:32 <DSidH> yup but I could never find documentation of this
427 2017-12-26T21:10:50 <DSidH> what encoding does it use?
428 2017-12-26T21:10:59 <arubi> there are very good comments about it in libsecp256k1
429 2017-12-26T21:11:20 <arubi> the encoding is just r and s as 32 bytes, and the recid byte encoded as in my paste, but it's not so simple
430 2017-12-26T21:11:21 <DSidH> ok let me read. I assumed its simply DER encoded as in tx
431 2017-12-26T21:11:35 <arubi> oh no, this one is much more fun :)
432 2017-12-26T21:11:50 <echeveria> bitcoin doesn't really use DER anymore.
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434 2017-12-26T21:12:33 <arubi> it's all over the signatures
435 2017-12-26T21:12:38 <arubi> err, transactions
436 2017-12-26T21:13:05 <arubi> it doesn't use anything else in transactions.. yet. hopefully soon we'll just have 64 bytes constant length..
437 2017-12-26T21:13:05 <echeveria> the format is far more restricted than DER
438 2017-12-26T21:13:14 <arubi> oh yes, that's true.
439 2017-12-26T21:13:55 <echeveria> DER allows unclear amounts of recursion, has dependancies on the underlying CPU integer sizes, all sorts of crazy you don't want.
440 2017-12-26T21:14:24 <arubi> cool, in fact I don't want DER at all :)
441 2017-12-26T21:14:34 <DSidH> arubi: does the "sign message" feature also use RFC6979?
442 2017-12-26T21:14:41 <arubi> yep
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444 2017-12-26T21:15:21 <echeveria> I was more surprised to learn that there was more acceptable formats for public keys in bitcoin than 04,03,02.
445 2017-12-26T21:15:33 <arubi> but the message hash is something you'll need to implement too. there is a header added, varints for lengths of the header and message..
446 2017-12-26T21:15:43 <arubi> oh yea, the all elusive hybrid keys
447 2017-12-26T21:15:58 <echeveria> there's supposedly one in testnet.
448 2017-12-26T21:16:15 * arubi should put another one
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450 2017-12-26T21:16:42 <arubi> would be cool if there's one on mainnet hiding behind p2pkh heh :)
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455 2017-12-26T21:38:23 <DSidH> arubi: can you please point me to the github link for the source code with comments for "sign message". I want to replicate those signatures (claimed to be from core)
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457 2017-12-26T22:00:56 <arubi> DSidH, for signmessage message format it's in bitcoin core repo and for recoverable signatures it's in the libsecp256k1 repo. I gotta go to sleep so can't search for it now, but probably tomorrow :)
458 2017-12-26T22:01:03 <arubi> /night
459 2017-12-26T22:01:23 <DSidH> no worries I found some links referring to magic bytes
460 2017-12-26T22:01:30 <DSidH> I'll try those in the meantime
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474 2017-12-26T22:41:35 <DSidH> How do I use recoverable signatures? do I just send the signature and the address, using which the receiver can decide the right key?
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497 2017-12-26T23:49:44 <spectra|> Satoshi wanted us to increase the block size
498 2017-12-26T23:50:02 <spectra|> many of the core developers sold out to Block Stream are the ones who vote against it
499 2017-12-26T23:51:26 <spectra|> the lightning network will inevitably lead to centralized hubs with large liquity which whom we open accounts - banks
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