Bag: Bitcoin Portfolio Monitor

About Bag: Bitcoin Portfolio Monitor

Bag is a watch-only Bitcoin portfolio monitor for tracking balances without placing wallet seed phrases on the phone. It supports public wallet information such as extended public keys and output descriptors, and can also read exported multisignature wallet details. The app checks balances through derived addresses; its description says the private wallet information remains on-device. Users can also enter balances manually for holdings kept elsewhere and combine them into a portfolio total. The free features include net-worth display in multiple fiat currencies, Bitcoin price charts across several time ranges, a dollar-cost averaging tracker with average purchase price and cost basis, a home-screen widget, mempool fee estimates, and light or dark themes. A professional tier adds multiple watch-only wallets, manual balances, routing connections through Tor, a custom block explorer endpoint, privacy-health checks, continuous balance monitoring with transaction alerts, and fee alerts. The app can assess wallet privacy using indicators such as address reuse and UTXO hygiene, but it does not send or receive funds; it is a watch-only monitor. The product description says that only derived addresses reach the block explorer, that wallet data is encrypted at rest, and that network traffic can be routed through Tor with a fail-closed behavior when the Tor connection is unavailable. It also lists no accounts, analytics, or third-party software kits, plus an optional biometric lock. Bag is Bitcoin-only and does not support other cryptocurrencies. These are product-stated privacy features; the app is for viewing balances and portfolio information, not a wallet for spending or storing coins on-chain. The app displays charts for Bitcoin prices over time ranges from a day through all available history, along with fee estimates in satoshis per virtual byte. A sats/BTC display toggle changes how quantities are presented. Paid features extend the portfolio view to multiple watch-only wallets and manually entered holdings, and the app can point to a user-configured block explorer. A Bitcoin health check reports privacy indicators for wallet usage, while Sentinel can monitor balances and alert to incoming or outgoing activity. These functions remain observational: Bag is explicitly watch-only and cannot send or receive Bitcoin.

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