questions about OP Stack re-orgs:
- can unsafe blocks be re-orged by the sequencer?
- if so, how often are unsafe blocks re-orged?
- in practice how many confirmations before block become safe?
- is there a way to view historical re-orgs?
- (bonus) what's the best way to detect a re-oreg?

Building @warpcast and @farcaster / dad / like to read, cook, ski, code

One thing to add which seems to be missed in below discussion: 

L2s (unsafe and safe) data can still be reorged due to L1 reorgs. L2s outsource their consensus to L1, so until L1 is finalized, you cant have nonzero L2 finality. 

(sidebar this is why CCTP waits 16min for L2 cross chain sends)

Contributing to OP Labs. Come join me on the track if you’re in /austin @ atxsprint.club

additional read: https://docs.optimism.io/stack/transactions/transaction-finality