This panel features Rijndael, Rob Hamilton, NVK, & Jonathan Pollack discussing the evolution of Bitcoin wallet security and the challenges of hardware wallets. Panelists discuss the differences between Bitcoin and Ethereum security approaches, highlighting how the Bybit hack resulted from blind signing. They explore hardware wallet innovations including policy signers, velocity controls, and private cosigning methods. The panel debates how to make complex Bitcoin transactions more verifiable while preserving the “Grug brain” simplicity that makes Bitcoin fundamentally safer than alternatives.
This presentation was recorded live at 2025’s OPNEXT, the Bitcoin scaling conference. For more info, visit opnext.dev. OPNEXT livestream and VODs are made possible by Taproot Wizards.
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# Notes:
• Bybit hack resulted from blind signing Ethereum contracts
• Hardware wallets must balance security and usability
• Policy signers enable covenant-like features today
• Private policy signing requires ZK proofs to verify
• Velocity controls are the most requested feature
• Bitcoin’s UTXO model offers superior verification
