​Блокчейн — это технология надежного распределенного хранения записей обо всех когда-либо совершенных биткойн-транзакциях.

М.Свон

Блокчейн - Распределенный реестр, в котором нет контролирующего органа. Однажды занесенную в него информацию изменить практически невозможно.

Inc.

Blockchain – A decentralized, digital ledger that records transaction information about a cryptocurrency in the chronological order.

Bitfury

Blockchain – (In Ethereum) a sequence of blocks validated by the proof-of-work system, each linking to its predecessor all the way to the genesis block. This varies from the Bitcoin protocol in that it does not have a block size limit; it instead uses varying gas limits.

Ethereum

Blockchain is a shared, immutable ledger for recording transactions, tracking assets and building trust. 

IBM

Blockchain – 1) a decentralized, publicly-owned ledger, 2)  immutable, unable to be edited, permanent, 3) maintained by remote miners all over the world.

MEW glossary

Blockchain, like the Internet, is an open, global infrastructure that allows companies and individuals making transactions to cut out the middleman, reducing the cost of transactions and the time lapse of working through third parties.

Sarah Underwood

Blockchain is a peer-to-peer distributed ledger technology which records transactions, agreements, contracts, and sales

K. Christidis, M. Devetsikiotis.

Blockchain is a decentralized transaction and data management technology developed first
for Bitcoin cryptocurrency.

Yli-Huumo J. et al.

Blockchain is a distributed data structure comprising a chain of blocks. Blockchain acts as a distributed database or a global ledger which maintains records of all transactions on a Blockchain network.

Bahga A., Madisetti V. K.

The blockchain is a distributed ledger technology in the form of a distributed transactional
database, secured by cryptography, and governed by a consensus mechanism.

Beck R. et al.

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