From Computer Science Wiki
Advanced programming[1]

A block chain is a growing list of records, called blocks, that are linked using cryptography. Each block contains a cryptographic hash of the previous block, a timestamp, and transaction data (generally represented as a Merkle tree).[2]

A blockchain is a decentralized, distributed, and oftentimes public, digital ledger that is used to record transactions across many computers so that any involved record cannot be altered retroactively, without the alteration of all subsequent blocks[3]

A ledger is a permanent summary of all amounts entered in supporting journals which list individual transactions by date.[4]


The video below is easily the best I have found explaining blockchain. I would suggest you watch it several times.

The video below is good high-level overview of blockchain, but doesn't hold a candle to the video above. If there was a nobel prize for awesome videos, the video above would deserve it.

Start here to understand blockchain[edit]

Other ideas in blockchain[edit]