Hello,
I have an paper wallet that was created before August 1st.
Now I wanted to import or sweep it to Bitcoin Core or Electrum wallet, but I can't.
On Bitcoin Core when I try to import I got message:
Invalid private key encoding (code -5)
On Electrum I cannot click "Sweep button" after paste priv key.
I noticed that my privkey have 51 characters, and new ones have 52.
What should I do to access my BTC?
Thank you for your help!