SatRyn: Bitcoin Wallet

SatRyn is a self-custody Bitcoin wallet built for people who believe their keys should stay on their device. No accounts. No sign-ups. No tracking. Just Bitcoin.

SELF-CUSTODY, YOUR WAY
Your private keys are encrypted with AES-256 and stored in the iOS Keychain — never on a server. SatRyn supports 11 wallet types including HD wallets from 12 or 24-word seed phrases, extended key imports, output descriptors, Electrum seeds, and watch-only wallets. Create one wallet or manage many, all from a single app.

MULTISIG VAULTS
Protect your Bitcoin with multi-signature security. Set up 2-of-3, 3-of-5, or any m-of-n configuration. Add cosigners from hardware wallets or other apps. Create, sign, and finalize PSBTs (Partially Signed Bitcoin Transactions) — all within SatRyn or across multiple devices.

EVERY ADDRESS FORMAT
Generate and manage Taproot (bc1p), Native SegWit (bc1q), Wrapped SegWit (3), and Legacy (1) addresses. Each wallet supports all four formats simultaneously so you always have the right address for any situation.

ADVANCED SEND & RECEIVE
Send to one recipient or batch multiple payments in a single transaction. Choose from mempool-based fee estimates or set a custom fee rate. Bump stuck transactions with Replace-by-Fee. Select specific UTXOs with full coin control — freeze, label, and tag your outputs. Scan QR codes or paste addresses with built-in validation and similarity detection to prevent mistakes.

FULL TRANSACTION CONTROL
View every detail of your transactions: inputs, outputs, fees, confirmations, block height, and RBF status. Add notes and labels. Export transaction details as PDF. Every transaction is yours to inspect and verify.

ENCRYPTED BACKUPS
Back up your entire wallet state — seeds, settings, contacts, labels — encrypted with AES-256-GCM to iCloud or as a local file. Enable automatic daily backups so you never lose your data. Restore on any device with your password.

REAL ENTROPY, REAL RANDOMNESS
Generate your seed phrase with provably random entropy. Draw on screen, flip coins, roll dice, or type random characters. SatRyn mixes your input with the system's cryptographic random number generator using HKDF-SHA256, giving you verifiable seed generation.

SECURITY AT EVERY LAYER

PIN protection (4-32 digits) with progressive lockout
Face ID and Touch ID authentication
Screenshot blocking on sensitive screens
Auto-lock with con