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What happens / what is the defense against creating a transaction using a validator that isn't expecting an asset type?

In other words: the validator determines "Can this UTXO be spent in this transaction", but is there something on-chain that determines "Can this UTXO be created with this validator script?"

For example: Validator script says "UTXO can be spent if ada amount is 100 ada"; someone creates a transaction that creates a UTXO of 100 USDT locked by this transaction; Is that 100 USDT locked forever?

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No validation happens for outputs: Anybody can send anything with arbitrary datum to any address.

So in your example, those 100 USDT would indeed be locked forever.

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