In India, Its not fully deployed but ICICI bank is the first bank who complete its first banking transaction using Blockchain technology in partnership with EMIRATES NBD and a lender from West Asia.
Blockchain technology allows for the secure management of a public ledger or database, where database transactions are verified and securely stored on a network and is managed by a network of nodes that all have their own copy of the database.
When the 1st block of transaction is created, it is marked with a HASH FUNCTION.
Blockchain also provides you a secure WALLET where you can store your bitcoins safely.
ICICI is now the first bank in this emerging technology who participated while many online retailers already accept BTC, some major companies still plan to or already have adopted this new currency like Amazon, OKCupid and Western Union.