Sentinel only uses public keys to track the balances and transactions of your offline and cold storage bitcoin wallets. Keep your private keys offline and secure.

• SegWit fully supported.
• Track any type of bitcoin address or extended public key, such as those created by Mycelium Wallet, Coinomi, Ledger, Trezor, and BRD.
• Remote deposit allows you to receive bitcoin payments into any tracked wallet or address without needing access to your private keys.
• Broadcast signed transactions from your offline wallet to the bitcoin network when you need to send bitcoin.
• Currency conversions for USD, GBP, EUR, CNY, RUB.
• Add an optional PIN code with PIN Scramble technology to help thwart keylogger attacks.

Sentinel is fully open source software. The code is available to review publicly on Github. Sentinel is provided by Samourai, the creators of Samourai Bitcoin Wallet