ColdHarborBoardiOS beta

Zero-knowledge wallet

Charted course

What is built, what is next, and what is deliberately not yet.

ColdHarbor states its boundaries. The roadmap names deferred work instead of implying it already ships.

Phase 0 · Phase 1 · Deferred
Bearing 00Underway

Phase 0 · Private beta

Native iOS and macOS wallets on Bitcoin regtest. Local key creation, passcode and biometric lock, and a Silent-Payments-only send and receive interface. A minimal relay hides infrastructure endpoints from the client.

  • Native SwiftUI iOS + macOS wallets sharing one Swift domain package
  • 24-word BIP-39 recovery, Keychain-backed, passcode and Face ID gated
  • BIP-352 receive and send interface (sp1 / tsp1 / sprt1 codes only)
  • Authenticated relay proxy with allowlisted methods, no key custody
Bearing 01Charting

Phase 1 · Signing and scan

Real BIP-352 output derivation and taproot signing on device, plus scanning against a relay tweak index so incoming payments are discovered locally rather than assumed.

  • secp256k1 ECDH output derivation and PSBT signing on device
  • Silent-payment scan against the relay tweak index
  • Spending discovered silent-payment taproot outputs
  • Persistent tweak-index backend beyond the in-memory cache
Bearing 02Deferred

Beyond the harbor

Work that is explicitly out of scope for the private beta and sequenced afterward. Listed so the boundary stays honest, not implied.

  • Mainnet support
  • Monero wallet integration as a distinct privacy asset
  • Dbloon (DBL) send/receive across web and native wallets
  • Multi-account and gap-limit scanning
  • RBF / CPFP fee bumping
  • Watch-only and hardware-wallet integration
  • BIP-352 labelled addresses
  • Passkeys / WebAuthn second factor

Sail with the beta

Test the flows before mainnet.

The regtest build lets you evaluate every send and receive path with no monetary risk.

Beta program