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block·chain | \ ˈbläk-ˌchān 
\
\Definition of blockchain
: a digital database containing information (such as records of financial transactions) that can be simultaneously used and shared within a large decentralized, publicly accessible network also : the technology used to create such a database The technology at the heart of bitcoin and other virtual currencies, blockchain is an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way. — Marco Iansiti and Karim R. Lakhani
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Time Traveler for blockchain
The first known use of blockchain was in 2011
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