Boltz Exchange
Atomic swaps ensure trustless, simultaneous execution of trades across different blockchains or layers, preventing one party from defaulting after receiving assets. In traditional swaps, especially cross-chain, users face timing risks where one side could claim funds without delivering the other. Atomic swaps resolve this through cryptographic commitments (like hash preimages) and conditional claims: both legs of the trade either complete together or fail entirely, reverting funds to their original owners. Boltz achieves this for Lightning and USDT by routing through tBTC, Threshold’s permissionless ERC20 Bitcoin wrapper on Arbitrum. The flow is Lightning to tBTC via an atomic Boltz swap, then to USDT0 via a DEX swap akin to those on Uniswap, stitched into one irreversible transaction by the Router contract on Arbitrum. Gas abstraction removes the need for ETH on Arbitrum, making the process seamless for Bitcoin-native users. Boltz plans to expand USDT Swaps across all currently supported Bitcoin layers, including on-chain BTC, Liquid, Rootstock, and Arkade, broadening the utility for businesses and individuals holding Bitcoin in various forms. Future updates will also incorporate USDT0’s Legacy Mesh, which is expected to enable direct support for additional chains such as Tron and Solana. Tron currently holds the largest USDT supply at approximately $83.9 billion according to Tether’s March 17, 2026 transparency report, underscoring the demand for eventual integration on high-volume networks beyond the initial OFT-focused deployment.About Author
