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) https://lists.linuxfoundation.org/pipermail/bitcoin-dev/2019-May/016914.html
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