fltrWallet 1.3

fltrWallet presents itself as a privacy-focused Bitcoin wallet that utilizes compact filters for blockchain synchronization. It prioritizes user privacy and aims to maintain strong anonymity standards. The wallet supports the import of 12-word recovery phrases from BRD and several other wallets, enabling users to transition smoothly to this platform. Notably, fltrWallet demonstrates the ability to synchronize any wallet's transaction history from years past within mere minutes.

A distinguishing feature of fltrWallet is its non-custodial approach, which mitigates the risk of exposing transaction history to Bitcoin nodes or centralized services. The wallet operates without its own service infrastructure, relying instead on a peer-to-peer network of Bitcoin servers complemented by the Compact Filters protocol. Users can verify these principles through Apple’s App Privacy Review tool, showcasing limited network connections and privacy-oriented functionalities. For transaction fee estimation, fltrWallet utilizes mempool.space.

In terms of user interface technology, fltrWallet employs SwiftUI, which facilitates reactive event flows that instantly reflect changes occurring on the blockchain or network. This innovation eliminates the need for refreshing or reloading, providing a seamless user experience across various devices. The application supports screen rotation on both iPads and iPhones and is optimized for windowed mode on iPads, adhering fluidly to different screen orientations and available space. Furthermore, fltrWallet has integrated a custom longitudinal/latitudinal coordinate framework designed to ensure intuitive interface rotations on any device.

For users migrating from legacy wallets, fltrWallet offers robust support for numerous Bitcoin Improvement Protocol (BIP) standards, allowing for easy importation of 12-word passphrases, including those from BRD wallets. This compatibility streamlines the transition process for users concerned about data transfers.

fltrWallet's architecture demonstrates an emphasis on performance, written entirely in Swift—Apple's native programming language—eliminating reliance on cumbersome runtimes or libraries commonly associated with cross-platform wallets. This design choice allows the application to maintain a minimal footprint while remaining perpetually responsive in the background. Users can expect the app to resume exactly where they left off, even after extended periods of inactivity.

Utilizing fltrNode multi-peer technology, fltrWallet maintains up to eight simultaneous connections to the Bitcoin network and actively monitors the Bitcoin Gossip protocol for real-time transaction updates reflected instantly within the interface. The application has removed dependencies on legacy mempool commands due to fingerprinting concerns—an issue inadequately addressed by competing wallets—which can often leave users at a disadvantage or reliant on centralized solutions.

Regarding security, fltrWallet has a minimal dependency framework, relying primarily on the well-respected libsecp256k1 from Bitcoin Core for elliptic curve encryption (ECC). The majority of its codebase was developed from scratch, reducing potential vulnerabilities associated with third-party libraries. This unique approach contributes to fltrWallet's remarkable resilience and synchronization speeds, designed specifically for Apple devices and fully optimized for multi-core processing. As such, it presents itself as an appealing choice for users seeking a balance of usability, performance, and security in a Bitcoin wallet.