Computing on Bitcoin #91
May 29, 2026 - Week 22
Research around Bitcoin-native verification, privacy, and interoperability keeps moving forward, with new proposals pushing the frontier.
Here's a selection of recent articles and developments shaping the next generation of Bitcoin infrastructure.
Let's dive in!
A new announcement from Rootstock introduces Union Bridge on testnet, an experimental BitVMX-based bridge designed to enable more verifiable Bitcoin interoperability.
rootstock.io/blog
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IntroducingUnion Bridge on Testnet:Verifiable Bitcoin Bridging Begins
Built on BitVMX, Union is designed to strengthen the security assumptions behind how BTC moves into programmable environments, helping Rootstock advance its role as the Bitcoin-aligned smart contract platform for DeFi, stablecoins, payments, and other onchain financial applications.
Cube introduces a Bitcoin-native virtual machine that combines BitVM, timeout trees, and Bitcoin DA to enable trustless smart contracts with unilateral exits, self-custody, and programmable global-state execution without federations, bridges, or Bitcoin protocol changes.
iog.io/news
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Introducing Cube
Cube introduces a fundamentally different approach to scaling Bitcoin: a native Layer 2 that enables smart contract execution directly on Bitcoin without bridges, federations, or protocol modifications. Transaction data is embedded on Bitcoin’s chain for full data availability, ensuring that the complete execution record lives on the most secure and decentralized ledger in existence.
A new report by Tiger Research examines Citrea’s BitVM and ZK-based Bitcoin L2 architecture, highlighting its approach to inheriting Bitcoin security through native verification and optimistic dispute resolution.
— Tiger Research (@tiger_research_) April 15, 2026
Thanks for reading this edition of Computing on Bitcoin News!
While Builders continue to expand the possibilities available on Bitcoin, we’ll keep tracking the research, protocols, and infrastructure shaping the future.
Until next week!
The Fairgate Team