Pay-to-Merkle-Root commits only to script paths, removing the key-path spend that leaves Taproot outputs' public keys visible on-chain, and leaves room for post-quantum signature schemes to be added by later soft forks. Merging records the proposal for review; it activates nothing.
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BIP 360 proposes a quantum-resistant output type
A proposal for a new output type that avoids exposing public keys was merged into the BIP repository as a draft.
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