Cryptology ePrint Archive: Report 2020/1126

Bitcoin-Monero Cross-chain Atomic Swap

Joël Gugger

Abstract: In blockchains where hashed timelock contracts are possible atomic swaps are already deployed, but when one of the blockchains doesn't have this capability it becomes a challenge. This protocol describes how to achieve atomic swaps between Bitcoin and Monero with two transactions per chain without trusting any central authority, servers, nor the other swap participant. We propose a swap between two participants, one holding bitcoin and the other monero, in which when both follow the protocol their funds are not at risk at any moment. The protocol does not require timelocks on the Monero side nor script capabilities but does require two proofs of knowledge of equal discrete logarithm across the edward25519 and the secp256k1 groups and ECDSA one-time VES.

Category / Keywords: applications / Blockchain, Atomic Swap, Cross-Chain Transactions, Bitcoin, Monero

Date: received 16 Sep 2020, last revised 18 Nov 2020

Contact author: h4sh3d at protonmail com

Available format(s): PDF | BibTeX Citation

Version: 20201118:171626 (All versions of this report)

Short URL: ia.cr/2020/1126