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MWEB Support for Jade Hardware Wallet

Context

The jadeltc fork already has standard Litecoin support. This plan adds MWEB (MimbleWimble Extension Block) support:

1. Export the MWEB scan key (view-only wallet functionality)
2. Derive and display MWEB stealth addresses
3. Sign MWEB inputs via standalone RPC and airgapped PSBT flow

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/**
 * MWEB Fee Calculator for Litecoin
 * Based on Litecoin Core implementation (v0.21.2+)
 *
 * Key findings from real transaction analysis:
 * 1. Peg-out transactions: Fee based only on vsize (MWEB weight doesn't add fee)
 * 2. Peg-in transactions: Fee = (vsize * regular_rate) + (mweb_weight * mweb_rate)
 * 3. Pure MWEB transactions: Fee = mweb_weight * mweb_rate only
 * 4. MWEB fee rate is typically 100 satoshis per weight unit
 */

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import express from 'express';
import * as argon2 from 'argon2';
import {
  sendNotificationToUsers,
  sendNotificationToOldUsers,
  sendNotificationToEmptyUsers,
  sendNotificationToUsersTest,
} from '../utils/notifications';

interface ISendNotificationRequest {

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DEBUG - Server listening on 127.0.0.1:4224
DEBUG - Running accept thread
INFO - NetworkInfo { version: 210202, subversion: "/LitecoinCore:0.21.2.2/", relayfee: 1e-5 }
INFO - BlockchainInfo { chain: "main", blocks: 2912010, headers: 2912010, bestblockhash: "185133f403be40de68e6668ef5f6094614fb9461e7858e37657923233d848043", pruned: false, verificationprogress: 0.99999976, initialblockdownload: Some(false) }
DEBUG - opening DB at "/mempool/electrs-ltc/db/mainnet/newindex/txstore"
DEBUG - 2912046 blocks were added
DEBUG - opening DB at "/mempool/electrs-ltc/db/mainnet/newindex/history"
DEBUG - 2912046 blocks were indexed
DEBUG - opening DB at "/mempool/electrs-ltc/db/mainnet/newindex/cache"

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{
  "onboarding": {
    "forgot_pin": "Ke harruar kodin PIN?",
    "forgot_pin_description": "Ke harruar kodin PIN?\nShkruj seed phrase-in (24 fjalët) për të rivendosur kodin PIN.",
    "enter_pin": "Vendos kodin PIN",
    "reenter_pin": "Vendos kodin PIN",
    "attempts_left_one": "{{count}} tentativë e mbetur.",
    "attempts_left_other": "{{count}} tentativa të mbetura.",
    "for_litecoin": "PËR LITECOIN",
    "create_wallet": "Krijo Portofolin",

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import React, {useEffect, useRef, useState} from 'react';
import {View, StyleSheet, TouchableOpacity, Image} from 'react-native';
import WebView from 'react-native-webview';
import DeviceInfo from 'react-native-device-info';
import {TransitionPresets} from '@react-navigation/stack';
import {RouteProp, useNavigation} from '@react-navigation/native';

import Header from '../components/Header';
import HeaderButton from '../components/Buttons/HeaderButton';

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const selectUtxosForConversion = (
  utxos: Utxo[],
  amount: number,
): Accumulator => {
  return utxos.reduce<Accumulator>(
    ({selectedUtxos, totalAmountSat}, utxo) => {
      if (totalAmountSat >= amount) {
        return {selectedUtxos, totalAmountSat};
      }
      return {

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// Validation library from: https://github.com/ruigomeseu/bitcoin-address-validation
// Copyright (c) 2018 Rui Gomes hello@ruigomes.me
import {base58_to_binary} from 'base58-js';
import {bech32} from 'bech32';
import {createHash} from 'sha256-uint8array';

const sha256 = (payload: Uint8Array) => createHash().update(payload).digest();

enum Network {
  mainnet = 'mainnet',

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{
  "onboarding": {
    "forgot_pin": "Mot de passe oublié ?",
    "forgot_pin_description": "Forgot your Pincode?\nEnter your seed phrase to reset your pincode.",
    "enter_pin": "Entrez votre code PIN",
    "attempts_left_one": "{{count}} attempt left.",
    "attempts_left_other": "{{count}} attempts left.",
    "for_litecoin": "FOR LITECOIN",
    "create_wallet": "Create Wallet",
    "already_wallet": "Already have a wallet? Log In",

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{
  "onboarding": {
    "forgot_pin": "Forgot Pincode?",
    "forgot_pin_description": "Forgot your Pincode?\nEnter your seed phrase to reset your pincode.",
    "enter_pin": "Enter your PIN",
    "reenter_pin": "Re-enter your PIN",
    "attempts_left_one": "{{count}} attempt left.",
    "attempts_left_other": "{{count}} attempts left.",
    "for_litecoin": "FOR LITECOIN",
    "create_wallet": "Create Wallet",