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Reused R values again Development & Technical Discussion
And should have been obvious to anyone who has implemented the cryptosystem too,…
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n/a | gmaxwell | December 12, 2014, 07:37:47 AM |
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Can we have newbie jail back, please? Meta
I have to say that I miss it, but ... then again I wasn't moderating it.There ar…
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n/a | gmaxwell | December 11, 2014, 06:59:33 PM |
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Help for eggdrop tcl for btc guild api Pools
You might want to try opening a thread in marketplace and seeing if you can pay…
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n/a | gmaxwell | December 11, 2014, 05:34:25 PM |
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How Perfect Offline Wallets Can Still Leak Bitcoin Private Keys Development & Technical Discussion
Yes, but that is no different to your blind-signature solution. If your host suc…
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n/a | gmaxwell | December 11, 2014, 02:15:29 PM |
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brainwallet.org offline transactions safe from reused R values? Development & Technical Discussion
You really shouldn't use anything from "brainwallet". It's had multiple serious…
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n/a | gmaxwell | December 10, 2014, 10:05:40 PM |
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WTF? 1FYMZEHnszCHKTBdFZ2DLrUuk3dGwYKQxh Service Discussion
::Sigh:: Again? https://people.xiph.org/~greg/21mbtc.pngReally the limitations…
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n/a | gmaxwell | December 10, 2014, 06:39:16 PM |
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How Perfect Offline Wallets Can Still Leak Bitcoin Private Keys Development & Technical Discussion
I found some time to look into blinded Schnorr signatures now. It does not preve…
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n/a | gmaxwell | December 10, 2014, 04:59:17 PM |
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compressed and uncompressed pubkey... Development & Technical Discussion
Well not pedantically. Its most logical to consider the compressed/uncompressed…
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n/a | gmaxwell | December 10, 2014, 02:52:53 AM |
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How Perfect Offline Wallets Can Still Leak Bitcoin Private Keys Development & Technical Discussion
Better to just sign twice and compare the results: they should be identical.I fo…
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n/a | gmaxwell | December 10, 2014, 02:11:09 AM |
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Bitcoin protocol standarization Development & Technical Discussion
I'd like to help build a platform that can provide vast capabilitiesWhat I was t…
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n/a | gmaxwell | December 09, 2014, 04:20:35 AM |
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Bitcoin protocol standarization Development & Technical Discussion
I agree that it would be a good idea to define a language agnostic spec for the…
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n/a | gmaxwell | December 08, 2014, 09:21:09 PM |
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Bitcoin protocol standarization Development & Technical Discussion
This VM would need to be able to have enough memory for the UTXO set. All the c…
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n/a | gmaxwell | December 08, 2014, 09:25:14 PM |
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Reused R values again Development & Technical Discussion
Perhaps blockchain.info (if people still trusts them) can create new addresses f…
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n/a | gmaxwell | December 08, 2014, 03:42:57 PM |
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How Perfect Offline Wallets Can Still Leak Bitcoin Private Keys Development & Technical Discussion
I don't get how this would prevent the leakage of private keys at all. My attack…
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n/a | gmaxwell | December 08, 2014, 01:00:25 PM |
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Bitcoind: Limit ISP Data Usage by Reducing Maximum Connections ? Bitcoin Technical Support
I started bitcoind running on a Linux machine, averaging 60+ connections. Now I…
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n/a | gmaxwell | December 07, 2014, 07:54:45 PM |
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WTF happened to ripple? Altcoin Discussion
In this old thread I described how the Ripple consensus model was unsound... tha…
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n/a | gmaxwell | December 07, 2014, 01:20:28 AM |
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Bitcoin protocol standarization Development & Technical Discussion
One of my longer term hopes around the refactoring of Bitcoin core into a separa…
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n/a | gmaxwell | December 06, 2014, 02:31:12 PM |
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Bitcoin 0.8.1 Clients vulnerable to easy bruteforce attack using RPC Development & Technical Discussion
Yes, the Debian packaging of Bitcoin was broken. This was known and fixed years…
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n/a | gmaxwell | December 06, 2014, 11:49:47 AM |
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crypto software - writing the grotty bits. Development & Technical Discussion
On the last bit, I have to take grau's side. Porting low-level code to a high-le…
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n/a | gmaxwell | December 06, 2014, 08:17:50 AM |
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How Perfect Offline Wallets Can Still Leak Bitcoin Private Keys Development & Technical Discussion
@gmaxwell:I agree with you that ZK is very expensive and hard to secure. With “b…
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n/a | gmaxwell | December 05, 2014, 02:31:54 PM |
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Decimal Places in Bitcoin? Development & Technical Discussion
There are other ways to check the sanity of your operations... In monero, uint64…
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n/a | gmaxwell | December 05, 2014, 02:24:22 PM |
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How Perfect Offline Wallets Can Still Leak Bitcoin Private Keys Development & Technical Discussion
But a new problem arises: How to implement the proof in a way that ensures that…
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n/a | gmaxwell | December 05, 2014, 01:15:24 PM |
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How Perfect Offline Wallets Can Still Leak Bitcoin Private Keys Development & Technical Discussion
Deterministic choice of “k” unfortunately does not solve the issue, because you…
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n/a | gmaxwell | December 05, 2014, 12:58:02 PM |
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How Perfect Offline Wallets Can Still Leak Bitcoin Private Keys Development & Technical Discussion
Perhaps a better RFC might help (or maybe a BIP)?IMO having a "standard" is the…
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n/a | gmaxwell | December 05, 2014, 12:10:59 PM |
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How Perfect Offline Wallets Can Still Leak Bitcoin Private Keys Development & Technical Discussion
Isn't that exactly what the point of the RFC is (i.e. every implementation shoul…
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n/a | gmaxwell | December 05, 2014, 11:41:49 AM |
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How Perfect Offline Wallets Can Still Leak Bitcoin Private Keys Development & Technical Discussion
I had thought that the idea of making k deterministic rather than random was a b…
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n/a | gmaxwell | December 05, 2014, 10:41:01 AM |
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How Perfect Offline Wallets Can Still Leak Bitcoin Private Keys Development & Technical Discussion
I want to draw your attention to another attack, that (to my knowledge) has not…
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n/a | gmaxwell | December 05, 2014, 10:31:22 AM |
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Headers-first client implementation Development & Technical Discussion
There is no change in behaviour for SPV lite wallets, as they are _headers-only_…
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n/a | gmaxwell | December 03, 2014, 07:27:00 PM |
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crypto software - writing the grotty bits. Development & Technical Discussion
I feel like this is misleading and is an anti-pattern. Not that 100% test covera…
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n/a | gmaxwell | December 03, 2014, 12:15:56 PM |
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crypto software - writing the grotty bits. Development & Technical Discussion
I guess the most important thing to know is that in C there are no promises that…
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n/a | gmaxwell | December 03, 2014, 01:45:38 AM |
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0.10 status Development & Technical Discussion
0.10 is coming along very nicely. I feel pretty good about this release, not eve…
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n/a | gmaxwell | December 02, 2014, 11:45:02 AM |
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bitcoind-ncurses: Terminal front-end for bitcoind Development & Technical Discussion
gmaxwell,I've missed being able to stay in touch with the field. Glad to see tha…
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n/a | gmaxwell | December 01, 2014, 06:17:19 AM |
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bitcoind-ncurses: Terminal front-end for bitcoind Development & Technical Discussion
I'm sad to have not heard from you for a while... Though I'd come by to point ou…
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n/a | gmaxwell | November 30, 2014, 06:40:33 PM |
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Best way to handle multiple accounts (like a bank)? Development & Technical Discussion
If you don't know what you are doingTo make this solid advice more useful, I'll…
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n/a | gmaxwell | November 30, 2014, 06:19:33 AM |
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ECDSA math Development & Technical Discussion
This also allows you to calculate the public key from the signature.The public k…
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n/a | gmaxwell | November 30, 2014, 04:33:30 AM |
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Bitcoin protocol standarization Development & Technical Discussion
The issue in creating a standard protocol is documenting all the bugs in the cur…
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n/a | gmaxwell | November 29, 2014, 07:59:59 PM |
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ECDSA math Development & Technical Discussion
Yes, if you know the private key. What awful thing are you doing?
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n/a | gmaxwell | November 28, 2014, 04:03:18 AM |
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Pseudonimity compromised? Development & Technical Discussion
The headline is kind of misleading. I'm not sure that anyone who'd considered t…
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n/a | gmaxwell | November 28, 2014, 04:01:03 AM |
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Pseudonimity compromised? Development & Technical Discussion
The headline is kind of misleading. I'm not sure that anyone who'd considered t…
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n/a | gmaxwell | November 28, 2014, 01:48:03 AM |
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On the Section 5 (Network) in the Original Bitcoin Whitepaper Development & Technical Discussion
By the way, why is there an upper size limit for a block?To prevent the system f…
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n/a | gmaxwell | November 27, 2014, 04:46:56 PM |
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Anonymity in the Mini-Blockchain scheme Altcoin Discussion
You're right, any additively homomorphic encryption would do. I chose Paillier b…
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n/a | gmaxwell | November 27, 2014, 04:29:32 AM |
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Anonymity in the Mini-Blockchain scheme Altcoin Discussion
It's not clear to me why it's using the paillier encryption. The commitment agr…
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n/a | gmaxwell | November 27, 2014, 01:02:05 AM |
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Blowing the lid off the CryptoNote/Bytecoin scam (with the exception of Monero) Altcoin Discussion
No, it uses EdDSA which are Schnorr signatures (provably secure under the random…
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n/a | gmaxwell | November 25, 2014, 08:21:33 PM |
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Something at stake - proof of stake alternative Altcoin Discussion
This is not addressing the fundamental limitation which is that 'bet' is entirel…
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n/a | gmaxwell | November 25, 2014, 02:05:14 PM |
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a copy of the blockchain with a full transaction index to get started? Bitcoin Technical Support
I typed "yes" and it has been reindexing for three days now. I don't know if thi…
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n/a | gmaxwell | November 25, 2014, 01:21:02 AM |
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As a developer, what's the best way to accept BTC without using third-parties Development & Technical Discussion
Scalability is not ultimately limited by the bitcoin network, but also by connec…
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n/a | gmaxwell | November 23, 2014, 10:03:36 PM |
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As a developer, what's the best way to accept BTC without using third-parties Development & Technical Discussion
No, but you are concerned about scalability while I don't know what you are doin…
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n/a | gmaxwell | November 23, 2014, 06:12:34 PM |
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As a developer, what's the best way to accept BTC without using third-parties Development & Technical Discussion
Have you looked into Baron? https://github.com/slickage/baron
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n/a | gmaxwell | November 21, 2014, 05:44:14 PM |
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Idea for ASiC resistance Altcoin Discussion
Suppose a coin switches its hashing algorithm each time a new block is found. Al…
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n/a | gmaxwell | November 20, 2014, 12:21:17 PM |
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chaum, offline coins vs BGP & bitcoin Development & Technical Discussion
Its kind of curious that according to the selfish-mining paper, if that remains…
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n/a | gmaxwell | November 19, 2014, 07:23:05 PM |
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A Decentralized Exchange? Development & Technical Discussion
Most of the people talking about that are handwaving, and not even defining the…
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n/a | gmaxwell | November 13, 2014, 04:06:09 PM |
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Speeding up bitcoind compilation? Development & Technical Discussion
Make sure you have ccache installed (and that it's being used).It will speedup w…
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n/a | gmaxwell | November 13, 2014, 04:00:59 PM |
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Treshold Signature Implementation ? Development & Technical Discussion
The scheme in the paper doesn't really work. It turned out to be unimplementable…
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n/a | gmaxwell | November 12, 2014, 07:28:31 PM |
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Merkle tree of the block hashes Development & Technical Discussion
A miner could be lucky to get the lowest hash. The odds of getting N low hashes…
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n/a | gmaxwell | November 11, 2014, 09:14:01 PM |
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Merkle tree of the block hashes Development & Technical Discussion
Using the lowest value hashes, however, let you pick the correct longest chain a…
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n/a | gmaxwell | November 11, 2014, 06:30:06 PM |
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Broadcasting all headers that are at least 6 blocks deep Development & Technical Discussion
Seems overly complicated considering that little that existing implementations d…
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n/a | gmaxwell | November 11, 2014, 06:22:43 PM |
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Block size hard-fork an opportunity to make other changes Development & Technical Discussion
Script types that include public keys are useful for applications that want to u…
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n/a | gmaxwell | November 04, 2014, 01:21:54 AM |
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Testnet specific code being exploited Development & Technical Discussion
The behaviour in testnet is intentionally insecure. Things like the difficulty r…
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n/a | gmaxwell | November 04, 2014, 01:10:18 AM |
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Faster bitcoin transaction times Development & Technical Discussion
Now that the discussion on side chains is more advanced, it looks like a side ch…
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n/a | gmaxwell | November 02, 2014, 10:33:10 PM |
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What are checkpoints in bitcoin code? Development & Technical Discussion
This is where I'm losing you. Yes there may be a checkpoint, but highest total d…
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n/a | gmaxwell | November 01, 2014, 09:51:29 PM |
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TeaCoin - BlockChain Problem?? Block Reward Reset Altcoin Discussion
Have you also noticed your consensus split along implementation/architecture bou…
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n/a | gmaxwell | November 01, 2014, 08:36:35 PM |
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What are checkpoints in bitcoin code? Development & Technical Discussion
pow is a form of validity.It isn't. See the discussion about fraud proofs and pr…
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n/a | gmaxwell | November 01, 2014, 07:44:05 PM |
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Faster bitcoin transaction times Development & Technical Discussion
I was saying that this algorithm was something that Bitcoin could use as well..…
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n/a | gmaxwell | November 01, 2014, 07:03:25 PM |
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What are checkpoints in bitcoin code? Development & Technical Discussion
special about 60 days of work?It's an arbitrary big number which is hopefully ma…
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n/a | gmaxwell | November 01, 2014, 06:39:58 PM |
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Faster bitcoin transaction times Development & Technical Discussion
Great talk. I'd really like to see some responses. Transcribe it. Watching an ho…
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n/a | gmaxwell | November 01, 2014, 06:19:36 PM |
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Faster bitcoin transaction times Development & Technical Discussion
Please stop trying to make me out like I don't know what I'm talking about.You k…
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n/a | gmaxwell | November 01, 2014, 06:17:06 PM |
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Faster bitcoin transaction times Development & Technical Discussion
I don't believe that money can be or is evil. And getting paid is something that…
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n/a | gmaxwell | November 01, 2014, 05:07:38 PM |
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What are checkpoints in bitcoin code? Development & Technical Discussion
No it doesn't. It can skip verifying very deeply burred signatures (as is the ch…
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n/a | gmaxwell | November 01, 2014, 04:47:55 PM |
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Faster bitcoin transaction times Development & Technical Discussion
Also, I love cryptocurrency and I think it's got a bright shiny future ahead of…
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n/a | gmaxwell | November 01, 2014, 04:10:24 PM |
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Faster bitcoin transaction times Development & Technical Discussion
Actually, I'm in the process of patenting a decentralized, secure, fast instant…
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n/a | gmaxwell | November 01, 2014, 03:05:17 PM |
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What are checkpoints in bitcoin code? Development & Technical Discussion
Good point. Parallel downloading is awesome. But the CPU still has to crunch ALL…
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n/a | gmaxwell | November 01, 2014, 02:53:15 PM |
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What are checkpoints in bitcoin code? Development & Technical Discussion
I still have not heard a reasonable argument as to why this can't/won't work.Bec…
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n/a | gmaxwell | November 01, 2014, 02:50:14 PM |
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What are checkpoints in bitcoin code? Development & Technical Discussion
Far better to just get rid of them: Headers first makes most reasons obsolete. …
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n/a | gmaxwell | November 01, 2014, 03:28:52 AM |
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Funding network security in the future Development & Technical Discussion
Verification is more important, yes. But I expect that the total cost of hashing…
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n/a | gmaxwell | October 30, 2014, 06:59:04 PM |
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Funding network security in the future Development & Technical Discussion
(an incentive for the user to give up on a beneficial tx to conserve a resource…
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n/a | gmaxwell | October 30, 2014, 05:47:40 PM |
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Funding network security in the future Development & Technical Discussion
I believe a good proxy for this is the total number of coins transferred in the…
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n/a | gmaxwell | October 30, 2014, 05:26:42 PM |
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A(nother) downside to Proof-of-Stake? Development & Technical Discussion
A workaround would be for each output to have 2 keys, a spending key and a POS k…
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n/a | gmaxwell | October 30, 2014, 04:46:31 PM |
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Funding network security in the future Development & Technical Discussion
Hm. I'll think about this more before I answer, I don't want to waste anyone's t…
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n/a | gmaxwell | October 29, 2014, 04:27:19 PM |
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Funding network security in the future Development & Technical Discussion
I would expect that once inflation stops, transaction fees will not be enough fo…
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n/a | gmaxwell | October 29, 2014, 03:52:01 PM |
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Funding network security in the future Development & Technical Discussion
the P2P node network could configure itself as a giant parallel processor,This…
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n/a | gmaxwell | October 29, 2014, 12:42:47 AM |
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Why blockchains might want to consider using AT "Turing complete" txs Bitcoin Discussion
Doesn't splitting every operation into micro-operations and feeding the result t…
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n/a | gmaxwell | October 28, 2014, 03:49:48 PM |
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Miner accepting non-standard txs required! Development & Technical Discussion
I feel sorry to see the referral code disclosed outside of the intended communit…
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n/a | gmaxwell | October 28, 2014, 03:21:00 PM |
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Why blockchains might want to consider using AT "Turing complete" txs Bitcoin Discussion
Kind of annoying that this has every instruction taking memory operands directly…
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n/a | gmaxwell | October 28, 2014, 01:43:56 PM |
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Bad bitcoin neighbor permanently prevents progress of good bitcoin node Bitcoin Technical Support
Thanks for following up, ... yep, known and expected behaviour, a side effect of…
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n/a | gmaxwell | October 27, 2014, 10:38:49 PM |
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Bad bitcoin neighbor permanently prevents progress of good bitcoin node Bitcoin Technical Support
It doesn't, your front node would have begun pulling the chain after a new block…
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n/a | gmaxwell | October 27, 2014, 02:53:16 PM |
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Missing params desc. in wiki + selective binding ports to ip adresses not work. Bitcoin Technical Support
It seems like -whitelist and -whitebind is missing from the wiki:https://en.bitc…
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n/a | gmaxwell | October 25, 2014, 03:27:02 PM |
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Pegged Sidechains [PDF Whitepaper] Development & Technical Discussion
It's trivial to prove an absence in a ordered data-structure (like the linked li…
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n/a | gmaxwell | October 25, 2014, 11:47:15 AM |
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New Powerful Attacks On ECDSA In Bitcoin Systems Development & Technical Discussion
Weird and not new.It's complaining about a combination of things; one is that BI…
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n/a | gmaxwell | October 25, 2014, 10:58:51 AM |
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What is the purpose of this transaction? Development & Technical Discussion
P2pool used to store its sharechain commitments (which is how it achieves trustl…
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n/a | gmaxwell | October 18, 2014, 12:37:55 AM |
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Whatever happened to Bitcoin Affiliate Network? Pools
One of the people seemingly involved (fire000) who was attacking everyone negati…
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n/a | gmaxwell | October 16, 2014, 02:51:43 PM |
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Message to devs from merchant Development & Technical Discussion
Spv could work, but youd want to be connected to a few nodes at a time to be con…
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n/a | gmaxwell | October 16, 2014, 01:24:15 AM |
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Armory, Bitcoin Core take a long long time to install: 48 hours + (BTC = null;) Armory
Most of the time taken for hosts when its slow to sync is orphan handing or wait…
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n/a | gmaxwell | October 15, 2014, 12:00:06 PM |
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Looking into forking the core wallet to use parallel computing to verify blocks Development & Technical Discussion
Phase 1 & 3 are on CPU. Phase 2 is on GPU. 0.067733 ms per verification.I have a…
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n/a | gmaxwell | October 13, 2014, 08:14:50 PM |
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bitXOR - A generic file encryption method originally designed for my bitcoin wallet Off-topic
cyclically xor-ed with the pass key.This sounds like dangerously crackable snake…
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n/a | gmaxwell | October 13, 2014, 07:45:50 PM |
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How are the bitcoin block hash generated? Development & Technical Discussion
Are they trully 100% random (generated by hardware) or is it pseudo-random (gene…
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n/a | gmaxwell | October 12, 2014, 04:20:01 PM |
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Delete private key from wallet Bitcoin Technical Support
We have intentionally not provided one because it is such a huge footgun and is…
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n/a | gmaxwell | October 11, 2014, 01:19:11 PM |
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Why I see the bitcoind currently distributed in Gentoo Linux as broken Development & Technical Discussion
FWIW, it's off now (in the overlay, in the real package when it's pulled) http:/…
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n/a | gmaxwell | October 10, 2014, 06:48:31 AM |
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Preventing Asic mining [fork] after next halving would solve a lot of problems. Development & Technical Discussion
The security argument for Bitcoin works if you set the price of mining hardware…
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n/a | gmaxwell | October 09, 2014, 12:37:57 PM |
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Looking into forking the core wallet to use parallel computing to verify blocks Development & Technical Discussion
Could you rephrase that slightly? I am not sure if you mean it will work or,Ther…
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n/a | gmaxwell | October 09, 2014, 10:56:55 AM |
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Preventing Asic mining [fork] after next halving would solve a lot of problems. Development & Technical Discussion
But one moment in future it will rapidly fall to zero.Similar to how one moment…
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n/a | gmaxwell | October 09, 2014, 10:38:33 AM |
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