1. Litecoin cash (lcc) was 51% attacked. https://bit.ly/36EUs7p. Litecoin cash (lcc) was 51% attacked. https://bit.ly/36EUs7p.
2. Aleth -- ethereum c++ client tools and libraries. https://github.com/ethereum/aleth. Aleth -- ethereum c++ client tools and libraries. https://github.com/ethereum/aleth.
3. Hyperledger besu. https://www.hyperledger.org/use/besu. Hyperledger besu. https://www.hyperledger.org/use/besu.
4. Blockdaemon: Institutional grade blockchain infrastructure. https://blockdaemon.com/. Blockdaemon: Institutional grade blockchain infrastructure. https://blockdaemon.com/.
5. Json-rpc in ethereum wiki (eth_call). https://github.com/ethereum/wiki/wiki/json-rpc#ethcall . Json-rpc in ethereum wiki (eth_call). https://github.com/ethereum/wiki/wiki/json-rpc#ethcall .