Turn a spare phone into an offline transaction signer. BitTool Signer keeps keys on the offline device and exchanges signing requests and signatures by QR. Supports Bitcoin, EVM, Solana and TRON, with public source and a separate online companion.
Ownbit is a mobile-first, non-custodial MultiSig and cold wallet supporting BTC, ETH, TRON, Solana and 500+ coins. Its two-phone cold wallet mode delivers hardware-grade security without extra devices. Keys stay encrypted on-device; no KYC, no personal data collected. Built continuously since 2017 with a spotless security record.
