Introducing Clementine Bridge: Citrea Deploys First Complete BitVM Bridge Design on Testnet

Despite being the world's largest digital asset, BTC has struggled to build relevance in decentralized finance. A secure bridge between Bitcoin and a secondary layer has always been a bottleneck for using BTC in a programmable environment. This problem has forced users to either keep Bitcoin as a passive store of value or rely on custodians for using BTC in financial activities. Citrea's BitVM-based Bitcoin bridge Clementine solves this by enabling the safest and most trust-minimized way to bridge BTC and extend its utility to decentralized finance. 

Citrea's Clementine bridge marks a historic moment for Bitcoin and a new beginning for BTC's utility. "It felt like magic when we saw all the bridge components work smoothly in our internal tests and that any malicious act is stopped by a single honest actor," said Ekrem Bal, Co-Creator of Citrea. "We're now ready to test Clementine in a real Bitcoin Testnet environment and make it more battle-tested for Citrea mainnet."

With the introduction of BitVM by a Bitcoin developer Robin Linus, verifying computations on Bitcoin and building Bitcoin-secured bridges became a possibility. Very soon after its introduction, Citrea team became a core contributor of BitVM and later a founding member of BitVM alliance, where BitVM's fundamental technology of executing a fraud proof of a zero-knowledge (ZK) proof on Bitcoin was developed collaboratively. Although accomplishing a ZK proof verification on Bitcoin was a prerequisite, there were still critical problems to address to implement this fundamental technology securely and efficiently into a Bitcoin bridge design. A detailed breakdown of this can be found in Clementine's whitepaper.

Clementine's design and whitepaper introduce novel solutions to two main research topics in BitVM-based bridge implementation, namely Bitcoin chain fork selection and capital efficiency of operators. These topics have been critical to solve as they ensure both the bridge's security and efficiency. Citrea's Clementine bridge offers clear solutions to both of these problems:

Clementine's design relies on zero-knowledge proofs, Bitcoin data availability, a novel Bitcoin Light Client design and BitVM. In the case of a malicious act, an honest watchtower provides a proof of the longest Bitcoin chain. Then the operator generates a proof verifying Citrea's state, watchtowers' challenges and payout for the withdrawal. If the operator is malicious, it won't be able to generate such proof, resulting in slashing the operator. Clementine has three main bridge actors to ensure the system's integrity:

Citrea: Bitcoin's Application (₿app) Layer

Citrea extends Bitcoin's utility without sacrificing its security. With zero-knowledge technology, Citrea enables Bitcoin to function as a fully programmable layer. With its Bitcoin bridge Clementine, Citrea offers the safest and most trust-minimized way to bridge BTC to a fully programmable secondary layer. 

For the first time in its history, Bitcoin Network will be able to support diverse on-chain applications and its utility will be extended to decentralized finance. 

Apply to Citrea's unique incubation program 'Citrea Origins' to build ₿apps.

For more information, please visit: Citrea website | Citrea X Account

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