KarpelesLab / libwallet / 24375689045

25%

Build Type

push

github

Committed by MagicalTux

Commit Message

add Bitcoin HD address support (balance, xpub, nextAddress)

## Phase 4.1: BTC balance queries via modchain_assets
- New XpubProvider interface in wltnet/network.go
- bitcoinBalance() calls modchain_assets(xpub) with the account's BIP-32
  extended public key. modchain performs gap-limit scans (0..lastI+20)
  server-side across multiple script flavors and returns aggregated UTXOs.
- nativeBalance() now dispatches to bitcoinBalance for n.Type == "bitcoin"
  (previously errored with "unsupported type bitcoin").

## Phase 4.2: BTC HD address derivation
- New wltacct/xpub.go: Account.Xpub() serializes pubkey+chaincode as a
  BIP-32 extended public key via ecckd.FromPublicKey().String().
- New wltacct/btc_address.go: receive/change address derivation helpers.
  m/0/i for receive chain, m/1/i for change chain (non-hardened, since
  TSS has no private key material).
- Account.Address for bitcoin-type accounts now points to the first
  receive address (m/0/0) instead of m/0 directly.

## Phase 4.3: Address discovery API
New API endpoints (wltacct/btc_api.go):
- Account/{id}:xpub — returns the BIP-32 xpub string
- Account/{id}:nextAddress — next clean receive address via
  modchain_lookupTxoBIP32 (returns address at lastI+1)
- Account/{id}:allAddresses — listing of receive+change addresses
  scanned via modchain with activity markers

## Dart side
- AccountApi gains xpub(), nextAddress(change?), allAddresses() methods
- New models: NextAddress, HdAddress, AddressListing

## Design notes
- TSS constraint: only non-hardened derivation possible (no private keys).
  Addresses use m/0/i (not BIP-44 m/44'/0'/0'/0/i), so they're consistent
  within libwallet but not importable into seed-based wallets.
- modchain-based: all gap-limit scanning, UTXO indexing, and fee
  estimation is delegated to the modchain RPC. Client-side code only
  builds the xpub string and renders addresses.

Tests: BTC create/xpub/nextAddress all pass in FFI integration test.
Bumps Dart package... (continued)

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