Introduction to Crypto currency, peer-to-peer network, Abstract Models for BLOCKCHAIN – GARAY model – RLA Model, Hybrid models cryptographic basics for cryptocurrency – a short overview of Hashing, signature schemes, encryption schemes and elliptic curve cryptography, Bitcoin – Wallet – Blocks – Merkley Tree transaction verifiability – anonymity – forks – double spending, Ethereum, Wallets for Ethereum – Solidity – Smart Contracts – some attacks on smart contracts, Applications of smart contracts, Block chain Application in various areas- Health care, Insurance, IoT etc.