Q: Core v30 compatability and importing into electrum

[aaronartisesky]

Hello, I was testing Jam on Umbrel:

• I was running a sweep with three destinations outside Jam
• Bitcoin Node has updated to Core 30.0 (damn the auto-update!), so opening Jam the alert above appeared;
• since then, differently from your tutorial, my system crashed. Neither Node or Jam was working. No way to restart them: Node stuck so Jam impossible to open.
• I immediately backed up both Bitcoin and Jam directories in located in ~/umbrel/app-data/
• wanted to reinstall apps, so uninstalled both by web interface (impossible to uninstall Bitcoin Node with Jam in the system)
• so reinstalled Node, restored app data and it started well, fast recovering sync
• then reinstalled Jam, restored app data with rsync -avh --progress --delete /data/backup_umbrel/jam/ ~/umbrel/app-data/jam/
• Jam restarted well, with the default wallet, recognizing the password, a little stuck for a moment in "Unlocking", then opened but... NO FUNDS
• the passphrase is correct
• so I imported it in Electrum, where I can see all the transactions and some funds, but only few (1/10 of the original ones)
  I understand probably made a homemade wrong fixing (and probably I'll pay for it), but I hope in some help, especially considering the discrepancy between Jam and Electrum with the same seed.
  Thank you in advance

[theborakompanioni]

Hey, thanks for the detailed explanation.
Don't panic, I think it might resolve to not having imported all accounts. If you import in electrum and you already see funds partially, you might need to import additional derivation paths. I think you will need to create different wallets for each account in electrum (not too familiar with it).

By default, Jam/JM uses the following derivation paths:

• Jar A: m/84'/0'/0' (with m/84'/0'/0'/0/0 deriving the first address in this jar)
• Jar B: m/84'/0'/1' (with m/84'/0'/1'/0/0 deriving the first address in this jar)
• Jar C: m/84'/0'/2' [...]
• Jar D: m/84'/0'/3'
• Jar E: m/84'/0'/4'

As an alternative: Users often suggest using Sparrow wallet.

And yes, the issues stems from the fact that JM is not yet compatible with Core v30.

Please report back if that worked for you. 🙏

[theborakompanioni]

@aaronartisesky Did you have a chance to test again?