I successfully completed opt-in of my multisig account but I still have a question: the procedure doesn’t include generation of VRF keys for the multisigned account.
Is it still possible to start harvesting from block 1?
Another issue: looks like there’s a spurious character in the mnemonics in the PDF file.
I did copy-paste from the PDF to NanoWallet and NanoWallet told me the mnemonic was wrong, I had to delete spaces and type them again to make it correct.