# Various Contributions

- [Ethereum Classic](/security-department/various-contributions/ethereum-classic.md)
- [ECIP-1092 51attack solution: PirlGuard & Callisto proposal](/security-department/various-contributions/ethereum-classic/ecip-1092-51attack-solution-pirlguard-and-callisto-proposal.md)
- [Ethereum](/security-department/various-contributions/ethereum.md)
- [Statement regarding Geth v1.10.8 split](/security-department/various-contributions/ethereum/statement-regarding-geth-v1.10.8-split.md)
- [EOS](/security-department/various-contributions/eos.md)
- [Page 1Chintai (EOS resource exchange) low severity issue.](/security-department/various-contributions/eos/page-1chintai-eos-resource-exchange-low-severity-issue..md)
- [EOS congestion 9/13/2019 and EOSPlay hack](/security-department/various-contributions/eos/eos-congestion-9-13-2019-and-eosplay-hack.md)
- [Ultimate solution to 51% attacks: amend the Nakamoto consensus](/security-department/various-contributions/ultimate-solution-to-51-attacks-amend-the-nakamoto-consensus.md)