Shield is a Two factor authentication that would be on a server-less p2p architecture on top of blockchain where every log would be recorded on to a decentralised ledger for transparency and none of the data that can help in identifying an user would be collected in the application which would help users in terms of privacy and anonymity and by using blockchain the whole system would be tamper proof. Shield 2FA is not owned by any single node in the network. Peers in the network can be any single computer which is connected to the internet.Need for SHIELD 2FA on blockchain::In every centralised apps today we are facing with issues that are concerned with our data they have. There have been number of data breaches despite many secure setups companies are using there is always a hole in centralised system that give way for hackers to enter and perform breaches. Even sometimes if business uses very safe and secure system then also breaches happen due to internal leakages. Data breaches are on rise and we can see number of Data on dark web being posted after hacks including username and password only people using 2FA get away from their login been used by hackers but still end up leaking their personal email and password that they might have used in any other account with no 2FA. Shield 2FA is trying to eliminate the use of personal details for login and even eliminating centralised storage and replacing it with cross chain blockchain so a system which will not take any personal detail or use any centralised storage but will still solve the purpose and will showcase the actual use case of blockchain.