Some people mentioned that they don't want to add their keys to a hot wallet. It should be feasible to add a bit of UI to allow users to sign the contribution proof offline. They would need to:
Paste the address of their offline account
Copy the proof bytes
Sign the bytes offline in whatever way suits them
Paste the signed bytes back into the UI
Do the transaction with a wallet that they don't mind importing into PolkadotJS
Some people mentioned that they don't want to add their keys to a hot wallet. It should be feasible to add a bit of UI to allow users to sign the contribution proof offline. They would need to: