Clench Wallet

Record body

Abstract

Clench is a Bitcoin-only, non-custodial wallet for Android. It uses Bitcoin Dev Kit and stores wallet data locally on the device. Wallet features: - Create single-sig and multisig wallets. - Import watch-only wallets from descriptors. - Create or restore BIP-39 seed phrase wallets with an optional passphrase. - Use native SegWit, nested SegWit, legacy, and Taproot script types. - Connect to Electrum servers, including personal servers and Tor SOCKS5 routes. - Use coin control, UTXO freezing, labels, batch payments, RBF fee bumping, CPFP, cancel replacement attempts, raw transaction import, and sweep flows. - Run node diagnostics for Electrum route, Tor mode, TLS pinning, server version, and tip height. Hardware-wallet features: - Exchange PSBTs by animated QR, BBQr, NFC, SD card, virtual disk, file import, or signed-return import where supported. - Work with QR-based signers such as SeedSigner, Keystone, Foundation Passport, and Blockstream Jade. - Work with Coldcard Q, Coldcard Mk4, and Coldcard Mk5 transfer paths. - Check Tapsigner NFC Tap Protocol status. - Sweep SATSCARD active slots with certificate verification and explicit CVC-authenticated unseal confirmation. - Block screenless-signer flows that require CVC-authenticated PSBT signing until dedicated authenticated support is complete. - Require explicit broadcast confirmation after hardware-wallet signing. Security and privacy features: - Encrypt keys with Android Keystore. - Encrypt the local wallet database with SQLCipher. - Protect wallet access with PIN and biometric authentication where available. - Validate signed PSBTs and finalized transactions before broadcast. - Avoid analytics, advertising SDKs, Firebase, Google Play Services, crash reporting services, and account sign-in. Network use is limited to wallet sync and optional user-triggered fee or price data lookups. Clench is free software under the MIT License.