How does blockchain work? How can I write a contract and add my machine into a global blockchain system? What are some examples of blockchain systems and what kind of servers they contain?

What is known as a ‘blockchain’ is a network of nodes which have identical copy of a file. The blockchain nodes are looking to reach consensus and then periodically add a block.

Not all blockchains offer smart contract capabilities. From the one that offer it - there are various programming languages used.

A person can run a node of a blockchain.

A person can also create and/or use a decentralized app / Dapp to call smart contract functions of a blockchain and do transfers.

Blockchains do not have servers - again, blockchains are a network of nodes.

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