Union Bridge Whitepaper: Enabling trust-minimized transfers powered by BitVMX
A new paper introduces Union: A Trust-minimized Bridge for Rootstock, designed to enable secure BTC transfers between Bitcoin and secondary blockchains.
Using a 1-of-n honest participant model with a multi-party BitVMX system, it ensures strong security without relying on majority trust. Key innovations include reusable security bonds for capital efficiency, enablers to manage functionary participation, a flexible light client framework, and optimized time-lock mechanisms.
arxiv.org
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Union: A Trust-minimized Bridge for Rootstock
We present Union, a trust-minimized bridge protocol that enables secure transfer of BTC between Bitcoin and a secondary blockchain. The growing ecosystem of blockchain systems built around Bitcoin has created a pressing need for secure and efficient bridges to transfer BTC between networks while preserving Bitcoin's security guarantees. Union employs a multi-party variant of BitVMX, an optimistic proving system on Bitcoin, to create a bridge that operates securely under the assumption that at least one participant remains honest.