I'm really not very familiar with griefing attacks but based on the definition I'd say they can be profitable for the attacker. Not directly but indirectly. My not-too-scientific analysis is based on the example given in the linked answer's references: https://consensys.github.io/smart-contract-best-practices/known_attacks/#insufficient-gas-griefing This ...


Ion Protocol developed by Clearmatics has implemented Cross-chain atomic swaps. See below link: https://github.com/clearmatics/ion As part of Stage 1, they have successfully implemented an atomic swap of ERC-223 tokens across two Ethereum chains. They plan to extend this to other Turing complete Blockchain platforms as part of Stage 2. See their blog post ...


There is ongoing work regarding it here: https://github.com/paritytech/parity-bridge It will eventually evolve to Polkadot network.

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