Overview

Implementing CoinJoin server and client process. Try to generate CoinJoin transaction which has five inputs and five outputs.

Initial setup

Start regtest bitcoind and electrs To stop bitcoind, run make stop-bitcoind

make run-servers

Fund alice wallet

bitcoin-cli --regtest createwallet "alice" false false "" false true

or

bitcoin-cli --regtest loadwallet "alice"

bitcoin-cli --regtest importdescriptors '[{ "desc": "wpkh(tprv8ZgxMBicQKsPcwmRJonpDgQecfz4yQ29EzGoJE8gdo22yhWZHJVdWcatkKTy28CqGxnfuyZmaVeehVb52RPJVc1qrs8dVR6uQvcZwWdcX5w/84h/1h/0h/0/*)#88ru8wxx", "timestamp":0 }]'

To get checksum of descriptor

bitcoin-cli --regtest getdescriptorinfo "wpkh(tprv8ZgxMBicQKsPcwmRJonpDgQecfz4yQ29EzGoJE8gdo22yhWZHJVdWcatkKTy28CqGxnfuyZmaVeehVb52RPJVc1qrs8dVR6uQvcZwWdcX5w/84h/1h/0h/0/*)"

bitcoin-cli --regtest generatetodescriptor 120 "wpkh(tprv8ZgxMBicQKsPcwmRJonpDgQecfz4yQ29EzGoJE8gdo22yhWZHJVdWcatkKTy28CqGxnfuyZmaVeehVb52RPJVc1qrs8dVR6uQvcZwWdcX5w/84h/1h/0h/0/0)"

Send to the others wallets from Alice

bitcoin-cli --regtest sendtoaddress bcrt1qwj7d4n048pj7xerwfnl2qmmnlk9ggjs7v0fqs7 20
bitcoin-cli --regtest sendtoaddress bcrt1qzwjn0h2zuw3r5ju9v44vn4fhdxmpg59sr5eydq 20
bitcoin-cli --regtest sendtoaddress bcrt1q83z6lkpsl6zr4ygnd20hmucxfshqw79e33jljw 20
bitcoin-cli --regtest sendtoaddress bcrt1qeqh35t057g0mr0mpyxhqc0ggxekm0ua9mrpv97 20
bitcoin-cli --regtest sendtoaddress bcrt1q7hv0uc8pun3u9vex4lxvf9tev8qxdn68pw6r30 20

If electrs is waiting for IBD, you need to mine a block.

$ [electrs::daemon] waiting for 0 blocks to download (IBD)

bitcoin-cli --regtest generatetodescriptor 1 "wpkh(tprv8ZgxMBicQKsPcwmRJonpDgQecfz4yQ29EzGoJE8gdo22yhWZHJVdWcatkKTy28CqGxnfuyZmaVeehVb52RPJVc1qrs8dVR6uQvcZwWdcX5w/84h/1h/0h/0/0)"

Run API server

HOST="127.0.0.1:50001" NETWORK="regtest" cargo watch -x run

Prepare utxos and psbt input as client

This will dump utxos to ./data/client/server_inputs.
Finally, these data will be created via API call which client register input to server.

cargo test dump_outpoint_and_psbt_input -- --nocapture

Construct PSBT as server

This will dump unsigned PSBT as ./data/psbt.txt

curl localhost:8080/api/v1/psbt

For test net

HOST="ssl://blockstream.info:993" NETWORK="testnet" cargo run
HOST="ssl://electrum.blockstream.info:60002" NETWORK="testnet" cargo run

Sign PSBT as client

cargo test sign_psbt -- --nocapture

Client wallet by bdk-cli

bdk-cli wallet -s 127.0.0.1:50001 --descriptor "wpkh(tprv8ZgxMBicQKsPd5qWpCSXVYmARoGqNAKi8iGjdJdAWkLM33WDmEB264qK81i8f9G1WiSHcK4QRyNrFxjDMB5VqNK2z1JvkpaQxuZvN2X7tot/84'/1'/0'/0/*)" --change_descriptor "wpkh(tprv8ZgxMBicQKsPeaTaHASFZrywrLFR2hreAv8yjoc1GkcgM6MKJ3pZDDN3Kdsqtz9xaZj4asJiyhH7ATuW7FzrCg1amJcEcmU2VdYCk4eMjYC/84'/1'/0'/1/*)" --wallet bob sync

bdk-cli wallet -s 127.0.0.1:50001 --descriptor "wpkh(tprv8ZgxMBicQKsPdu9c5ujos5QUdGzUu3TkXWhTjTYiJ2SGEscdPALwZPXPn7fypuMi6eiD42YDV1qRTEdiV5DNaYLhHEijUn4Y7dAiJAHYCn3/84'/1'/0'/0/*)" --change_descriptor "wpkh(tprv8ZgxMBicQKsPdu9c5ujos5QUdGzUu3TkXWhTjTYiJ2SGEscdPALwZPXPn7fypuMi6eiD42YDV1qRTEdiV5DNaYLhHEijUn4Y7dAiJAHYCn3/84'/1'/0'/1/*)" --wallet carol sync

bdk-cli wallet -s 127.0.0.1:50001 --descriptor "wpkh(tprv8ZgxMBicQKsPeA6GrkH85xhTDfDz8oBbjqSnXJCXiohMEr1sxNmc7VwtiAWyrT9rNxWnNveaZ2MKJ9nAC1htJPvKkDZs7w8p6jHEtZWMk3J/84'/1'/0'/0/*)" --change_descriptor "wpkh(tprv8ZgxMBicQKsPeA6GrkH85xhTDfDz8oBbjqSnXJCXiohMEr1sxNmc7VwtiAWyrT9rNxWnNveaZ2MKJ9nAC1htJPvKkDZs7w8p6jHEtZWMk3J/84'/1'/0'/1/*)" --wallet dave sync

bdk-cli wallet -s 127.0.0.1:50001 --descriptor "wpkh(tprv8ZgxMBicQKsPeaTaHASFZrywrLFR2hreAv8yjoc1GkcgM6MKJ3pZDDN3Kdsqtz9xaZj4asJiyhH7ATuW7FzrCg1amJcEcmU2VdYCk4eMjYC/84'/1'/0'/0/*)" --change_descriptor "wpkh(tprv8ZgxMBicQKsPeaTaHASFZrywrLFR2hreAv8yjoc1GkcgM6MKJ3pZDDN3Kdsqtz9xaZj4asJiyhH7ATuW7FzrCg1amJcEcmU2VdYCk4eMjYC/84'/1'/0'/1/*)" --wallet eve sync

bdk-cli wallet -s 127.0.0.1:50001 --descriptor "wpkh(tprv8ZgxMBicQKsPeSeYKZhm4A2JDKunauLBtRP9HiDUb7frW8RNkzofRSESaLnkXL4m5ihADerbgFmLyWWJvzwU28HALbYEFqRrsNbpHFUaAoa/84'/1'/0'/0/*)" --change_descriptor "wpkh(tprv8ZgxMBicQKsPeSeYKZhm4A2JDKunauLBtRP9HiDUb7frW8RNkzofRSESaLnkXL4m5ihADerbgFmLyWWJvzwU28HALbYEFqRrsNbpHFUaAoa/84'/1'/0'/1/*)" --wallet frank sync