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Is it possible to create a taproot address that a quantum computer can't spend via the keyspend path?

No, taproot outputs contain a public key. Every public key has a corresponding private key. If a taproot output doesn't contain a valid public key, it can't be spent at all (neither key path or script ...
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Taproot signing with PSBT: How to determine signing method?

Yes, that looks correct. I suppose you are correct that PSBT_IN_TAP_INTERNAL_KEY is not strictly necessary, but one of the main ideas with PSBTs is to include as much information as possible, and to ...
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Is taproot considered nonstandard to older clients?

P2TR outputs (and higher-version native witness outputs) are standard since Bitcoin Core v0.19: https://github.com/bitcoin/bitcoin/pull/15846 Inputs spending P2TR outputs are non-standard in all ...
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How do I know if the Bitcoin Core software on my computer is running taproot, segwit or something else?

Until Bitcoin Core 23.0.0, the status of deployments of consensus changes can be listed with the getblockchaininfo command: Returns an object containing various state info regarding blockchain ...
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