The Design of the Schnorr BIP ~ bitcoin-dev Mailinglist

Here are two BIP drafts that specify a proposal for a Taproot softfork. A number of ideas are included:

• Taproot to make all outputs and cooperative spends indistinguishable from eachother.
• Merkle branches to hide the unexecuted branches in scripts.
• Schnorr signatures enable wallet software to use key aggregation/thresholds within one input.
• Improvements to the signature hashing algorithm (including signing all input amounts).
• Replacing OP_CHECKMULTISIG(VERIFY) with OP_CHECKSIGADD, to support batch validation.
• Tagged hashing for domain separation (avoiding issues like CVE-2012-2459 in Merkle trees).
• Extensibility through leaf versions, OP_SUCCESS opcodes, and upgradable pubkey types.

The BIP drafts can be found here:

• https://github.com/sipa/bips/blob/bip-schnorr/bip-taproot.mediawiki specifies the transaction input spending rules.
• https://github.com/sipa/bips/blob/bip-schnorr/bip-tapscript.mediawiki specifies the changes to Script inside such spends.
• https://github.com/sipa/bips/blob/bip-schnorr/bip-schnorr.mediawiki is the Schnorr signature proposal that was discussed earlier on this list (See https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2018-July/016203.html)

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