Bitcoin Core - Recovery After Fatal Crash

my machine running my bitcoin core node (v28) crashed with some severe hardware failures unrelated to bitcoin core. After restoring the machine and restarting bitcoin core (machine was down for a day), bitcoin core seems to recover fine and starts syncing up again. However, I saw the following log appear in the command line during the restart (before the resync of missing blocks started):

Assuming ancestors of block have valid signatures.

The referenced block is around 10 months old (so long before the crash). What exactly does that mean? Does bitcoin core just trust that everything before is valid? Am I running a risk here that my chainstate is somehow incorrect, I am not on the heaviest chain etc.?

Can I generally assume that if bitcoin core starts up and syncs to the most recent block, I am guaranteed to be fine and part of the correct uncorrupted chain? I am using the node for economic activity and need to be sure my wallet balances are correct.

Thank you very much!

EDIT: I found out that there is an assumevalid flag set by default in bitcoin core. I want to be re-verify the whole blockchain without interrupting my running setup. Would it make sense, to run a second node with assumevalid=0 and simply compare the hash of the most recent block with my economic node? Would this ensure, everything is valid?



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