Learn how a blockchain works in about five minutes. Four short rides, one idea each. No wallet, no coin, no jargon.
A blockchain is a shared record book that many people keep copies of at once. New entries get added in batches called blocks. Each block is stamped with a code made from its contents and from the block before it, so the blocks form a chain. Changing an old entry breaks every stamp after it, and everyone holding a copy can see the break. That is why a blockchain can be trusted without a bank or a clerk in the middle.
A blockchain is a shared digital record book that many computers keep copies of at the same time. Entries are grouped into blocks, and each block is locked to the one before it. Because everyone holds a copy and old entries cannot be changed without it showing, people can trust the record without a bank or middleman.
First, new transactions are gathered into a block. Second, the block gets a hash, a unique code made from its contents and from the previous block's hash. Third, the network does work or follows rules to agree the block is valid. Fourth, every copy of the ledger adds the block. Changing an old block would change its hash and break every block after it.
A hash is a fixed-length code, like a fingerprint, made from a piece of data. The same data always gives the same hash, and changing even one character gives a completely different hash. Blockchains use hashes to prove a record has not been altered.
Each block stores the hash of the block before it. If someone edits an old block, its hash changes, so the next block no longer matches, and neither does any block after that. To hide the edit, a cheater would have to redo all of that work and convince most of the network at once, which is extremely hard on a large blockchain.
Mining is the work computers do to add a new block on networks like Bitcoin. Miners keep guessing a number, called a nonce, until the block's hash meets a difficulty target, such as starting with a row of zeros. The guessing costs electricity, and that cost is what makes rewriting history so expensive.
Consensus is how thousands of independent computers agree on one true version of the ledger. When copies disagree, the network follows the version that follows the rules and is backed by the majority. That is how a blockchain works without one person or company in charge.
No. Bitcoin is one application built on a blockchain. A blockchain is the underlying record-keeping method, and it can also track things like stablecoins, property records, supply chains and digital identity.
Wyoming has passed a long list of blockchain laws. It created a special bank charter for digital-asset banks, was the first state to recognize DAO LLCs, and set up a state commission for a Wyoming stable token. The University of Wyoming also runs a Center for Blockchain and Digital Innovation that hosts the annual Wyoming Blockchain Stampede.
Yes, it is free, and no, you do not need a wallet, an account or any cryptocurrency. It runs in your web browser on a phone or computer and takes about five minutes.