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About GreenAddress
GreenAddress is a Bitcoin wallet operated by Blockstream, offering a 2-of-2 multisig security model where the user holds one key and Blockstream's server holds the other. This design eliminates the single point of failure of a lost private key while keeping the user in control of funds. It also supports the Liquid Network for faster, confidential transactions and integrates with hardware wallets like Ledger and Jade.
Its core value proposition is balancing self-custody with practical security: users cannot lose funds by losing a single key, and transactions require a second signature from the server, which can be protected by 2FA. This addresses the common pain point of private key management for non-technical users, reducing the risk of permanent fund loss while avoiding the trust issues of fully custodial services.
In the past six months (2026-02-28 to 2026-08-31), GreenAddress has focused on maintenance and incremental improvements, including updates to its underlying GDK library and Liquid Wallet Kit. The wallet continues to support testnet for development purposes.
A notable negative point within the last two years: WalletScrutiny has flagged the Android build as non-reproducible, meaning the published binary cannot be independently verified to match the open-source code. Additionally, no third-party security audit has been publicly released.
GreenAddress, a Bitcoin wallet, was acquired by Blockstream in 2016, marking a strategic move to integrate sidechain technology. It became the first mobile wallet to support Segregated Witness (SegWit), reducing fees and enabling faster transactions. Earlier, it pioneered opt-in Replace-By-Fee (RBF), allowing users to bump fees for stuck transactions. The team also developed a multi-platform wallet library in C, with bindings for Java and Python, supporting Elements Alpha features like Confidential Transactions. These milestones reflect its long-term focus on protocol innovations and developer tools.
Over the past six months, GreenAddress (Blockstream Green) has focused on core protocol and security upgrades. The 5.6.0 release (Aug 2026) introduced AMP2 account support on testnet via the LWK backend, enabling more flexible multi-asset management. Lightning Network support entered beta, allowing users to enable a Lightning node from wallet settings with dedicated send/receive flows, though initially limited to mainnet software wallets excluding BIP39. Jade QR Connect was added for airgapped signing on watch-only wallets, enhancing cold-storage security. Transaction blinding was implemented for Liquid-based airgapped signing. Swaps were temporarily disabled due to a Boltz service interruption, with recovery actions provided for stuck swaps. Backend dependencies were upgraded: GDK to 0.77.7, LWK to 0.18.3, and zxing-cpp. Future roadmap emphasizes expanding Lightning Network functionality beyond beta, extending AMP2 support to mainnet, and further hardening airgapped signing workflows. The team also improved sensitive-data redaction in logs and fixed several security-related bugs, including QR scanner freezes and PSET layout issues.
GreenAddress was founded by Lawrence Nahum, who also serves as its core leader. Nahum is a Bitcoin expert and currently holds the position of Chief Architect at Blockstream, the parent company that acquired GreenAddress in 2016. Prior to founding GreenAddress, he was Vice President of Technology at Markitserv, an OTC financial services firm. Under his leadership, GreenAddress became one of the first multi-signature Bitcoin wallets, emphasizing security and usability. No other co-founders or current core executives are reliably identified in the provided references.