Quote from: granttw13 on November 21, 2024, 11:38:06 PM

So I recently recovered my Dad's old Blockchain.com wallet from 2016.

If you recovered it successfully, you have access to it so that you can get its private key too. You can import it to Electrum wallet, choose BIP39, and I also recommend you to move all your bitcoin in blockchain.com wallet to a new wallet created by Electrum (offline).

Blockchain.com wallet is a close source wallet, it's not recommended.
Electrum wallet is open source wallet, it's better for Bitcoin users.

Verify the Electrum wallet too.
[GUIDE] How to Safely Download and Verify Electrum.

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When I tried to send 1 BTC to Coinbase, the blockchain.com wallet decided to send 5. Looking at the transaction id, it sent 1 BTC to coinbase, which i received as intended, but it sent 4 BTC to a completely different address.

The 4 BTC likely sent to your address, that is a change address too. However the change address belongs to your same wallet, that means you should see 4 BTC in your wallet balance. Please confirm, did you see it in your wallet balance?

You see it in balance, means you didn't lose your bitcoin.

What is the "Change" address on bitcoin wallet ? read to know !