Blockchain technology is a way of recording data in a shared digital ledger, where transactions or records are grouped into 'blocks' that are cryptographically linked to the previous block, forming a continuous chain of records over time.

Each new block contains a cryptographic reference to the block before it, so altering any past record would also change every subsequent block's reference, making tampering with historical entries extremely difficult to do without it being immediately detectable.

A Shared Ledger That's Hard to Alter

Why It Doesn't Need One Central Authority

Rather than being stored and controlled by a single central authority, most blockchains are distributed across a network of independent computers, each holding a copy of the ledger, which is why blockchains are often described as 'decentralized.'

While blockchain technology became widely known through cryptocurrencies like Bitcoin, its underlying record-keeping structure has since been explored for other uses too, including supply chain tracking, digital identity verification, and secure record management in various industries.

Sources

  1. Wikipedia β€” overview of blockchain technology and its structure
  2. IBM β€” industry explainer on how blockchain works
  3. World Economic Forum β€” background on blockchain applications beyond cryptocurrency

FAQ

Is blockchain the same thing as cryptocurrency?

No β€” cryptocurrency is one application of blockchain technology, but the underlying record-keeping structure is also used for other purposes.

Why is it hard to alter past records on a blockchain?

Each block contains a cryptographic reference to the previous block, so changing any past record would break the chain and be immediately detectable.

Is a blockchain controlled by one central authority?

Typically no β€” most blockchains are distributed across a network of independent computers, each holding a copy of the ledger, making them decentralized.

About the Author

We reference Wikipedia, IBM, and World Economic Forum to explain the background and current understanding of this topic.

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