Support Taproot

[optout21]

Taproot is a next major Bitcoin softfork. It is expected to get activated on mainnet in mid-November.

Tasks:

• Support sending to Taproot addresses (should not be enabled before receive support in popular wallets) (mostly done)
• Schnorr signature support
• Taproot primitives in scripts

/later:/

• Create Taproot address, support sending from Taproot address (receive)

Docs:

• BIP 340: Schnorr Signatures
• BIP 341: Taproot: SegWit version 1 spending rules
• BIP 342: Validation of Taproot Scripts
• BIP 350: Bech32m format for v1+ witness addresses

[optout21]

Segwit v1 support, with Bech32m encoding is already supported, see:

#1345

https://community.trustwallet.com/t/taproot-support-send-already-supported/213127

[optout21]

Schnorr support in the included Trezor library:

• A schnorr version is included (from longer time), bot used

• A wc-specific variation exists for Zilliqa

• Current latest Trezor contains Bitcoin ABC Schnorr, which is a different variant

• BTC Schnorr support is work-in-progress on in Trezor, see:

• Re-enable secp256k1-zkp and make it default trezor/trezor-firmware#1534 Issue: Re-enable secp256k1-zkp and make it default

• ECDSA and Schnorr from secp256k1_zkp trezor/trezor-firmware#1678 PR

• Support Taproot trezor/trezor-firmware#1656 Issue: Support Taproot

We should include Trezor version once it is availble.

[github-actions]

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