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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 ...


1

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 ...


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


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