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Multi-transaction contracts/joins. POC code only.
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README.md
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README.md

CoinJoinXT

See https://gist.github.com/AdamISZ/a5b3fcdd8de4575dbb8e5fba8a9bd88c for the base idea.

In a nutshell: do cooperative contracts over multiple transactions, including CoinJoins but boosting deniability cf a single CoinJoin, with no extra interactivity (time-wise) overhead. See BIP141 for the main point about the ability to sign in advance. More docs here later.

Note that this repo is marked "POC" because it is, in fact, just a proof of concept, there is no intent to create fully usable code at this point. Using joinmarket-clientserver as a backend for the bitcoin stuff, but note the for-occ-poc branch is needed. Install in development mode, then you can just switch to that branch.

(As you can see from the last sentence, this is just a bunch of monkey patching. I told you it was POC!).

Consequently, this is a DO NOT USE at least for now.

Try it on regtest if you like, of course.

(Warning mainly because no test suite yet, but there are other issues too).

The syntax is:

python occreceiver.py wallet-name server port
python occsender.py wallet-name server port

On regtest, it just funds with necessary utxos on regtest to make it work; remove/comment if you want to try it with wallets, then you need utxos in the specified ranges. There is just one template found in the occbase.py file, retrieved as fixed, for now. You'd either edit it (see comments) or make a new one. Alter the input amount ranges passed to the get_utxos_from_wallet function correspondingly.

(Here should go actual documentation).

The input utxos are p2sh-p2wpkh (funded from segwit Joinmarket wallets, compatible, see above), and the 2 of 2 co-owned outputs are native p2wsh.

Publishes whole tx chain to occresults.txt so you can take a look.

Bitcoin tx fees: set statically at top of occbase.py for now. Obv needs to be dynamic.

Optionally broadcasts everything directly to chain without waiting if you set broadcast_all = 1 in the config under POLICY. Otherwise use what's in occresults.txt to broadcast them manually, in sequence, using sendrawtransaction. Config and wallets are in ~/.CoinJoinXT/*

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