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I would know what does Bitcoin verify when you download a block.
Are the transactions verified too, or not? If they are, will it be the case for their signatures?
Best wishes.
It depends what kind of software you're talking about.
A full node, by definition, verifies all consensus rules for newly received blocks and their transactions, including:
- Proof of work
- Difficulty adjustment
- Subsidy (do miners not print too much money)
- Double spending (do transactions not spend anything already spent)
- Transaction balance (do transactions not spend more than they send)
- Resource limits (block weight limit, op count limits)
- Signature validity
- ...
Other software that interacts with the Bitcoin network may verify whatever it likes - ranging from all of the above, to some subset, or nothing at all and just trusting what other nodes or servers give it.
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