Oauth protocol Ommer (aka Uncle) On-chain governance OraclesOrderer Network P2PPKIPragma(s) or Pragma-line Private Blockchain Proof of Activity Proof of Capacity Proof of elapsed time Proof of Stake (POS) Proof of Work (POW) Pub / Sub Public key cryptography REST API (representational state transfer API) RPC (Remote Procedure Calls) SDKShardingSmart ContractSolidityTokenTuring Complete languageUbuntuUTXOVIPERWallet Zeppelin (or Open Zeppelin) 51% Attack