The Mempool Open Source Project®

Explore the full Bitcoin ecosystem with The Mempool Open Source Project®. See the real-time status of your transactions, get network info, and more.

The Mempool Open Source Project®

Explore the full Bitcoin ecosystem with The Mempool Open Source Project®. See the real-time status of your transactions, get network info, and more.

Nothing about the two transactions shown is strange. The first is 2 in 2 out, the second is 1 in, 2 out; normal payments [1]. If you examine their witness you'll see they're like 90% of other taproot transactions, just keypath, no scripts involved. But in fact, this is a bet. Two parties flipped a fair coin for the winnings (a small chunk of the input funds). Not literally; they used cryptography to get an exactly 50% chance of winning without having to trust the other. They were both running signet nodes (in fact I had one on my laptop at home and another on a VPS), and used decoy packets in BIP324 (bitcoin p2p encrypted transport) to communicate, so no one could even know the negotiation was happening (side note: this idea feels like it should be useful in many other contexts, and it's surprisingly easy to set up, with a very simple patch to your bitcoind). So we have a fair bet inside a coinjoin; you could think of it as a randomized payjoin if you like, but, the transfer of funds is not for some goods and services but, just a wager, and it's perfectly fair because of a cryptographic trick that was discussed on delving [2] though it's changed from what was written there. Payments inside coinjoins break subset sum analysis; this is just another kind of payment. Amongst other virtues of such a system is that it creates economic activity between peers without middlemen which is vital to Bitcoin's general pseudonymity. The implementation is at

GitHub

GitHub - AdamISZ/babilonia: Win stupid prizes

Win stupid prizes. Contribute to AdamISZ/babilonia development by creating an account on GitHub.

. The repo is currently 95% AI-written so not very readable (still not *unreadable*, but, y'know how it is) but I have a paper that I've nearly finished that is human written and human readable for those interested in the mechanics. [1] In fact those familiar with details of payjoins *will* see something specific about the 1st transaction that makes it like a payjoin. But it isn't hard to remove that, and anyway, it's only a watermark for 'this is a payjoin', not for what it *actually* is... [2]

Delving Bitcoin

Emulating OP_RAND

Yes, I believe that works. So the process would be: (The following is modifications to Algorithm 2 per the doc): Alice provides: the unsigned tr...