Using old JBOK keys

Anyone know how to work with an old JBOK key from bitcoin versions prior to 0.4? Like, do we need to set up a new wallet with an older client and then use pywallet for this?

I'm not sure that Pywallet would make any difference, as Loose-Key wallets had a different structure in the database. The most sensible approach is to download a compatible old version of Core and use the console. Address by Address: Using the dumpprivkey command, as at that time I believe dumpwallet did not exist.

but how can I import the JBOK adres with the secret key into bitcoin 0.3.24 that's the compatible old version of core

In other words, do you have partial wallet data, but not the complete file itself?.

Question: How do you define "JBOK"? It's pertaining to "Just-a-Bunch-Of-Keys" in a wallet, not deterministically derived from a seed. Because it looks like you're talking about a single key that's not a private key like in the example in your previous thread: /index.php?topic=5537510 Anyways, since you mentioned a wallet.dat before, even if it's not an HD wallet, you can still restore that to the v28.1 without affecting the old keystore. Just use the menu "File->Restore" in Bitcoin Core and rescan it for transactions.