I often create a batch of wallets (on an air gapped RaspberryPi) for later use. But would like clarification on a few things:
1) With these recent forks, are wallets I created with the 0.11.1.0 cli (or older) invalid or have the potential to decay in anyway?
2) Can empty wallets from the batch still be used with the latest client 0.12.0.0 and beyond?
3a) Is a wallet/address that was never used (e.g. no initial deposit) invisible on the monero blockchain (since no transactions took place)?
3b) Is it correct that: whether the wallet was generated several months ago, or yesterday; only when a deposit/transaction is created will be the first time the monero blockchain knows about it?