From f2effa357557483fe37da54dec4d53f96313431b Mon Sep 17 00:00:00 2001
From: sneurlax <sneurlax@gmail.com>
Date: Mon, 25 Mar 2024 23:03:00 -0500
Subject: [PATCH] add most basic bip86 address derivation stub

to be tested according to https://github.com/bitcoin/bips/blob/master/bip-0086.mediawiki#test-vectors
---
 .../isar/models/blockchain_data/address.dart       |  4 +++-
 lib/utilities/enums/derive_path_type_enum.dart     |  1 +
 lib/wallets/crypto_currency/coins/bitcoin.dart     | 14 ++++++++++++++
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/lib/models/isar/models/blockchain_data/address.dart b/lib/models/isar/models/blockchain_data/address.dart
index 8adaa4ce5..16516edf4 100644
--- a/lib/models/isar/models/blockchain_data/address.dart
+++ b/lib/models/isar/models/blockchain_data/address.dart
@@ -164,7 +164,7 @@ enum AddressType {
   stellar,
   tezos,
   frostMS,
-  ;
+  p2tr;
 
   String get readableName {
     switch (this) {
@@ -196,6 +196,8 @@ enum AddressType {
         return "Tezos";
       case AddressType.frostMS:
         return "FrostMS";
+      case AddressType.p2tr:
+        return "Taproot"; // Why not use P2TR, P2PKH, etc.?
     }
   }
 }
diff --git a/lib/utilities/enums/derive_path_type_enum.dart b/lib/utilities/enums/derive_path_type_enum.dart
index 6d2371735..eb86aa6d5 100644
--- a/lib/utilities/enums/derive_path_type_enum.dart
+++ b/lib/utilities/enums/derive_path_type_enum.dart
@@ -15,6 +15,7 @@ enum DerivePathType {
   bch44,
   bip49,
   bip84,
+  bip86,
   eth,
   eCash44,
 }
diff --git a/lib/wallets/crypto_currency/coins/bitcoin.dart b/lib/wallets/crypto_currency/coins/bitcoin.dart
index 01ce800e8..7008d8b3b 100644
--- a/lib/wallets/crypto_currency/coins/bitcoin.dart
+++ b/lib/wallets/crypto_currency/coins/bitcoin.dart
@@ -30,6 +30,7 @@ class Bitcoin extends Bip39HDCurrency with PaynymCurrencyInterface {
         DerivePathType.bip44,
         DerivePathType.bip49,
         DerivePathType.bip84,
+        DerivePathType.bip86, // P2TR.
       ];
 
   @override
@@ -115,6 +116,9 @@ class Bitcoin extends Bip39HDCurrency with PaynymCurrencyInterface {
       case DerivePathType.bip84:
         purpose = 84;
         break;
+      case DerivePathType.bip86:
+        purpose = 86;
+        break;
       default:
         throw Exception("DerivePathType $derivePathType not supported");
     }
@@ -157,6 +161,16 @@ class Bitcoin extends Bip39HDCurrency with PaynymCurrencyInterface {
 
         return (address: addr, addressType: AddressType.p2wpkh);
 
+      case DerivePathType.bip86:
+        final taproot = coinlib.Taproot(internalKey: publicKey);
+
+        final addr = coinlib.P2TRAddress.fromTaproot(
+          taproot,
+          hrp: coinlib.Network.mainnet.bech32Hrp,
+        );
+
+        return (address: addr, addressType: AddressType.p2tr);
+
       default:
         throw Exception("DerivePathType $derivePathType not supported");
     }