Thank you very much LoyceV !

Sorry for not answering before. I've been very busy and just logged back in. Ok, I understand, so for importing the private key, it's much better to use the WIF not compressed as in your example. I think everything's clear.

Quote from: ABCbits on June 20, 2025, 08:29:50 AM

Quote from: bluecat4 on June 19, 2025, 04:26:19 PM

I think in addition to having Electrum on the laptop offline, it can also be necessary to buy a hardware wallet.

If you're willing to learn, consider install and using one of Linux distro (such as Linux Mint) on that offline laptop.

Quote from: LoyceV on June 19, 2025, 05:21:29 PM

Quote

Bitaddress gives 2 public keys: the public key ( 130 characters ) and the compressed public key ( 66 characters ). Are both the master public key ? Which of the 2 public keys do I need to create a watch only wallet ? It’s important not to expose the private key.

In Electrum, you'll just use the Bitcoin Address. Considering it's old, you probably need the one that isn't "Compressed". If you use my test-key from the quote above, it's this address:
1DBZmNMC69PPbC1wjGYaagXQKiba2e5NdS
You won't need the 130 or 66 character hex keys, you'll need the WIF (again: not Compressed):
5KMWmYkn5YWkJnUDG4utD9L1HXQv3DBseqqCGsQXmthcEerbA7k

Personally i would recommend to copy Bitcoin address from compressed and uncompressed public key just to be sure.

Thank you very much to both of you.

Mod note: Consecutive posts merged