Open Source Java Crypto Wallets

Sparrow Wallet is an open-source, desktop-focused Bitcoin wallet designed for users who value complete control, security, and privacy when managing their Bitcoin funds. It provides a rich graphical interface that exposes Bitcoin’s underlying UTXO model rather than hiding it behind abstractions, helping users understand every input, output, and fee involved in transactions. Sparrow supports advanced workflows such as Partially Signed Bitcoin Transactions (PSBT), multisignature setups, customizable fee selection, and comprehensive coin control — making it suitable for power users, privacy advocates, and those running their own full nodes. It integrates with a wide range of hardware wallets (e.g., Ledger, Trezor, Coldcard) and connects to Bitcoin Core or Electrum servers, including via Tor for enhanced anonymity.

Armax Wallet & Miner is the official Android client for Armaxcoin (ARMX) – a decentralized layer-1 blockchain powered by NIST FIPS 204 post-quantum cryptography (ML-DSA-65) and the ASIC-resistant ArmaxHash v2 consensus algorithm. This release combines a secure non-custodial quantum-safe wallet with a native ARM64 NEON mobile CPU miner. Users can safely store, transfer, and receive testnet coins, track confirmed balances and immature mining rewards, and mine directly to Stratum pools from their smartphone. Safety First: The miner includes thermal and battery monitoring to prevent device overheating, pausing automatically during high loads. Security & Privacy: Private keys never leave your device. All credentials are encrypted with AES-256-GCM using hardware-backed Android Keystore (TEE/StrongBox). No trackers, no cleartext traffic, and zero telemetry. Experience quantum-secure decentralized mining today.

The Multifunctional Ethereum Wallet (MEW) is an Ethereum blockchain based decenttalized application (DAPP). It uses smart contracts on the Ethereum blockchain for executing transactions, bets, informations, codes, stc. The MEW is a Beta version, it's in testing phase, so it is available only on Ropsten, Infura network. However it is already capable to connect on the mainnet as well. The platform is designed to be a decentralized platform, which is available for everyone. It will have a lot of features, like marketplace, trading area, shop, sport betting, and other platforms in a single application where smart contracts and blockchain technology can give back the control in the hands of users. At this moment only the sport betting option is available. We need testers and advisors who can help our work. Development is in progress, we will add instructiond, details and videos continuosly. IF you have any question, please contact us.