Support Taproot

[optout21]

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

Tasks:

• [x] 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:

https://github.com/trustwallet/wallet-core/pull/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:

• https://github.com/trezor/trezor-firmware/issues/1534 Issue: Re-enable secp256k1-zkp and make it default

• https://github.com/trezor/trezor-firmware/pull/1678 PR

• https://github.com/trezor/trezor-firmware/issues/1656 Issue: Support Taproot

We should include Trezor version once it is availble.

[github-actions[bot]]

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