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| 15:30:26 | earlz: | So, is it possible to craft a vout that is spendable by a "password" (ie, not just a brainwallet) without revealing the password on the blockchain? |
| 15:30:40 | earlz: | (aside from how insecure that might be) |
| 15:31:31 | belcher: | maybe a p2sh where the script pushes the password onto the stack and then checks for equality? then the scriptsig has to contain the password |
| 15:31:45 | earlz: | And somehow make it so that if you send two transactions, it is not possible to use the redeem script for the first transaction for the second transaction |
| 15:32:17 | earlz: | yea.. I know you could hash the password so it's not in plain-text.. but then if you ever use that password again it's obvious |
| 15:32:26 | belcher: | yeah its a one-time password |
| 15:32:52 | veox: | belcher: something like https://en.bitcoin.it/wiki/Script#Transaction_puzzle ?.. |
| 15:33:34 | belcher: | yeah i knew id read it somewhere |
| 15:33:41 | veox: | Uh, I mean earlz |
| 15:35:46 | earlz: | yea, I mean a script that is more than one-time |
| 15:36:27 | earlz: | idk if it's possible.. starting to think probably not |
| 15:36:39 | belcher: | what are you trying to do? |
| 15:36:56 | belcher: | could you have a password that decrypts a key which you then use to sign |
| 15:37:11 | earlz: | not really trying to do anything, just athought excercise lol |
| 15:40:40 | earlz: | I tend to think it's almost always more secure to make a brainwallet than to do that |
| 15:41:22 | belcher: | no because a brainwallet cracker can in parallel search the entire blockchain |
| 15:41:40 | belcher: | but with this encrypted key they need that part too |
| 15:43:19 | sipa: | you need a system where the verifier needs less information than the signer |
| 15:43:45 | sipa: | a shared secret (aka password) does not satisfy that |
| 15:44:11 | earlz: | I was thinking if you could somehow access transaction id from within script, maybe that'd help.. but even then |
| 15:48:30 | earlz: | What if you used a brainwallet with a "salt" of the vin txid or some such? |
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| 20:50:43 | phantomcircuit: | gmaxwell, did write down your thoughts on a pruning bitcoind? |
| 20:50:58 | phantomcircuit: | i think 35GB is the magic number for a bunch of vps providers |
| 21:17:13 | Eliel_: | earlz: frankly, a password hashed to create a private key you can use to sign is perhaps the best way to get reusable password where the transaction doesn't reveal the password to the whole world. |
| 21:17:24 | Eliel_: | so, yes, that's brainwallet. |
| 21:18:32 | Eliel_: | of course, you don't have to use the same hashing algorithm everyone else uses. But then again, that only makes knowledge of the hash algo a part of the password. |
| 21:42:54 | sipa: | phantomcircuit: just see the pruning pull request? |
| 21:43:02 | sipa: | afaik it's sort of ready to merge |
| 21:47:06 | phantomcircuit: | sipa, there's someone on #bitcoin saying it crashed |
| 21:48:09 | sipa: | "it" ? |
| 21:48:12 | sipa: | that pr? |
| 21:48:27 | sipa: | report it :) |
| 21:50:47 | phantomcircuit: | trying to get actual details out of him... |
| 21:51:18 | phantomcircuit: | i think he changed the prune value and something went wrong |
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| 22:11:41 | earlz: | Eliel_: well, my idea is to salt the user-provided password with something |
| 22:11:47 | earlz: | maybe vin hash or some such |
| 22:12:06 | earlz: | eh, either way its just something I've been toying with. Not sure it's secure enough to trust to anything |
| 22:12:08 | phantomcircuit: | sipa, yeah this is the one that just removes the network node flag |
| 22:14:34 | dgenr8: | the ;;tblb formula sensitivity to hashrate deviation from difficulty is a bit presumptuous at long intervals |
| 22:15:01 | dgenr8: | theoretical expected time to start of next block interval >= i seconds is 600(math.exp(i/600)-i/600-1), which is kind of pretty |
| 23:34:58 | dgenr8: | hmm. the current "tblb" formula simplifies to 600(exp(i/600)) when ignoring hashrate deviation. The missing -1 means it's adding one average interval at the end, which is strange |
| 23:35:12 | dgenr8: | a bigger problem is the whole missing -i/600 term |
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| 23:51:16 | dgenr8: | we've got a chicken that takes i seconds to cross the road, with poisson traffic http://math.stackexchange.com/questions/195560/probability-question-with-interarrival-times |
| 23:51:31 | dgenr8: | guess i'll be submitting a PR |