Does OP_CHECKSIGFROMSTACK intentionally allow cross-UTXO signature reuse?

I ran a CSFS experiment on Bitcoin Inquisition Signet and got a spend confirmed:

https://mempool.space/signet/tx/cc1b6d352f75348b6a52c7f5c68fc5caea2512423e08011e8f69a9bb85195f97

The tapscript is simply:

<pubkey> OP_CHECKSIGFROMSTACK

The witness provides (sig, msg, script, control_block).

Since (sig, msg) becomes public after spending, if another UTXO is later sent to the same script, anyone could reuse the exact same pair to spend it — because CSFS only enforces:

schnorr_verify(pubkey, msg, sig)

with no commitment to the spending transaction. By contrast, OP_CHECKSIG signatures commit to the input outpoint, so cross-UTXO reuse is impossible.

This leads to three questions:

  1. Is cross-UTXO signature reuse an intentional property of CSFS, or a risk that must be handled at the script level?
  2. What are the standard patterns to prevent unintended reuse — include the outpoint in msg? combine with OP_CHECKSIG?
  3. In oracle constructions where reuse is desirable (e.g., attesting "BTC > 100k"), is this the intended security model?


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