I have an old greenaddress web wallet. It has some sort of dual signature thing. Its been nagging me to "re-deposit" but I havent, which means I dont have the 2-3 protection, but it should not matter.
When I try to send some BTC from a "simple" account, it says "invalid address" for a perfectly good BTC address validated on blockchain . com and says the format is BASE58 (P2PKH)
Any ideas?
The greenaddress support email is now dead unfortunately.