Quote from: Dabs on May 23, 2016, 02:56:34 AM

I have an idea, and guys, let me know if this is decent or crazy or whatever: or if this is already what is being done by JoinMarket, Shuffle, Whatever.

1. I make a website or a server for this purpose.
2. It asks users to create their transactions, and a given time limit, say 30 minutes or 1 hour.
3. Every 30 minutes, or every hour, it gets back to all the users with the giant CoinJoin transaction formed thus far and asks all the people to sign.
4. The site itself takes a fee, and that's some how inserted into the process.
5. Assuming the site is "trustable", then only outsiders are "attackers" and they're not going to learn much except "I see 100 inputs and 200 outputs, and I own 20 of them. I dunno who the other 80 are."
6. Repeat every hour or every whenever. Or every 100 people. Or once a day.
7. Java script or open source client side signing thingy that can sign for you if you're away from your computer so the site doesn't have to wait an hour when it reaches the minimum number of people.

The other idea I had, which I mentioned a long time ago, is like a traditional mixer, in that the mixer site itself has to be trusted, but it does everything internally, and you just send your coins. Instead of the traditional mixing of unrelated inputs and outputs, it's basically a CoinJoin mixer that gets all deposits and spits out the transactions just like a traditional mixer. The only downside is having to trust the site.

I think it's at least a decent idea, although implementation might be tricky. One limitation with JoinMarket is the ability to easily facilitate a transaction with a very large number of parties. As of right now, there are only about 50 "makers" on the orderbook, and likely many of those are actually the same people, running multiple yield generator bots. The largest coinjoin done using JoinMarket that I am aware of had 17 parties. (that might not even be the most interesting thing about that transaction...)

Huh

I think something like this would be possible to build within JoinMarket, such that "takers" are given an option to delay and group their transaction with other takers (and makers, maybe), but again, I'm sure the coding would be substantial. A better solution for JoinMarket will likely be simple growth. The GUI is probably helping to bring in more users. An Electrum plugin could also be potentially huge for JoinMarket, bringing fungibility (is that a word?) to many more users. I think some privacy conscious websites may also benefit from implementing JoinMarket transactions into their wallet structure (online casinos, darknet markets, etc.) which will also help the current limitations.

Interesting times.