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arXiv · 2101.06000

Horizon: A Gas-Efficient, Trustless Bridge for Cross-Chain Transactions

Rongjian Lan·Ganesha Upadhyaya·Stephen Tse·Mahdi Zamani
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Abstract

With the rise of digital currency systems that rely on blockchain to ensure ledger security, the ability to perform cross-chain transactions is becoming a crucial interoperability requirement. Such transactions allow not only funds to be transferred from one blockchain to another (as done in atomic swaps), but also a blockchain to verify the inclusion of any event on another blockchain. Cross-chain bridges are protocols that allow on-chain exchange of cryptocurrencies, on-chain transfer of assets to sidechains, and cross-shard verification of events in sharded blockchains, many of which rely on Byzantine fault tolerance (BFT) for scalability. Unfortunately, existing bridge protocols that can transfer funds from a BFT blockchain incur significant computation overhead on the destination blockchain, resulting in a high gas cost for smart contract verification of events. In this paper, we propose Horizon, a gas-efficient, cross-chain bridge protocol to transfer assets from a BFT blockchain to another blockchain (e.g., Ethereum) that supports basic smart contract execution.

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Rongjian Lan, Ganesha Upadhyaya, Stephen Tse, Mahdi Zamani. 2021-01-15. Horizon: A Gas-Efficient, Trustless Bridge for Cross-Chain Transactions. https://arxiv.org/abs/2101.06000

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