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Bitcoin Dev Archive 2025

BIP Draft: unspendable() Descriptor Key Expression

1 message, 17 Jan 2025. Started by Andrew Toth.

Andrew Toth

Permalink Original thread on gnusha.org

Andrew Toth permalink original

This is a BIP Draft for an unspendable key expression that can be used as the taproot internal key. The expression creates a provably unspendable key that is deterministically created with only the descriptor. This allows all participants to verify that the keypath is unspendable, while also hiding that fact from outside observers.

Previous discussion on delving https://delvingbitcoin.org/t/unspendable-keys-in-descriptors/304.

https://github.com/bitcoin/bips/pull/1746