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This paper introduces 0xPass, a modular protocol architecture designed to enhance security and usability for universal cross-chain accounts by separating request orchestration, transaction solving, and transaction signing into interoperable layers. By implementing user-approved requests tied to authenticated identities and employing threshold signatures, 0xPass mitigates risks associated with key custody and transaction signing. The architecture not only facilitates secure cross-chain operations but also supports features like constrained authorization delegation and auditable communication, paving the way for a decentralized and user-controlled ecosystem.
0xPass redefines cross-chain account security by eliminating single points of failure in transaction signing and enhancing user control over asset management.
Universal accounts allow users to manage assets and execute operations across heterogeneous blockchain ecosystems through a single interface, but they introduce security and trust challenges involving authentication, authorization, transaction signing, key custody, recovery, and decentralization. This paper presents 0xPass, a modular protocol architecture for universal cross-chain accounts. 0xPass separates request orchestration, transaction solving, and transaction signing into interoperable layers. User-approved requests are bound to authenticated identities and authorized across layers, while threshold signatures prevent any single transaction node from holding a complete signing key. The design also supports constrained authorization delegation, transaction policies, account recovery, distributed key management, and auditable communication among independently operated sub-networks. We describe a staged deployment path from a centrally operated service to a permissioned network and ultimately to a permissionless network with third-party modules, collateral-backed onboarding, and rotating key-management committees. The resulting architecture provides a practical framework for extending cross-chain account functionality while progressively reducing centralized trust and preserving user control over transaction authorization.
