19:29 <Francis_> a couple of days ago I was posting about custom change outputs in Bitcoin Core. for those interested, I think I found an existing way to do it.

19:31 <Francis_> https://github.com/bitcoin-core/HWI/blob/master/docs/bitcoin-core-usage.md

19:32 <Francis_> "We now create a new Bitcoin Core wallet and import the keys into Bitcoin Core. The output is formatted properly for Bitcoin Core so it can be copy and pasted. ``` $ ../bitcoin/src/bitcoin-cli createwallet "coldcard" true { "name": "coldcard", "warning": "" } $ ../bitcoin/src/bitcoin-cli -rpcwallet=coldcard importmulti '[{"desc": "wpkh([8038ecd9/84

19:32 <Francis_> '/0'/0']xpub6DR4rqx16YnCcfwFqgwvJdKiWrjDRzqxYTY44aoyHwZDSeSB5n2tqt42aYr9qPKhSKUdftPdTjhHrKKD6WGKVbuyhMvGH76VyKKZubg8o4P/0/*)#36sal9a4", "internal": false, "range": [0, 1000], "timestamp": "now", "keypool": true, "watchonly": true}]' [ { "success": true } ] ``` Now we repeat the `getkeypool` and `importmulti` steps but set a `--internal` flag and us

19:32 <Francis_> dd", "keypool": true, "range": {"start": 0, "end": 1000}}] $ ../bitcoin/src/bitcoin-cli -rpcwallet=coldcard importmulti '[{"internal": true, "timestamp": "now", "desc": "wpkh([8038ecd9/84h/0h/0h]xpub6DR4rqx16YnCcfwFqgwvJdKiWrjDRzqxYTY44aoyHwZDSeSB5n2tqt42aYr9qPKhSKUdftPdTjhHrKKD6WGKVbuyhMvGH76VyKKZubg8o4P/1/*)", "keypool": true, "range": [0, 1000],

19:32 <Francis_> e the change keypath (`m/44h/0h/0h/1`) in `getkeypool` to generate change keys. ``` $ ./hwi.py -f 8038ecd9 getkeypool --wpkh --keypool --internal 0 1000 [{"internal": true, "timestamp": "now", "desc": "wpkh([8038ecd9/84h/0h/0h]xpub6DR4rqx16YnCcfwFqgwvJdKiWrjDRzqxYTY44aoyHwZDSeSB5n2tqt42aYr9qPKhSKUdftPdTjhHrKKD6WGKVbuyhMvGH76VyKKZubg8o4P/1/*)#qw4uzs

19:32 <Francis_> "watchonly": true}]' [ { "success": true } ] ``` The Bitcoin Core wallet is now setup to watch a two thousand keys (1000 normal, 1000 change) from your hardware wallet and you can use it to track your balances and create transactions. The transactions will need to be signed through HWI. "

19:33 <Francis_> (sorry for terrible formatting I'm on phone)