Here is how Wikipedia explains blockchain: "The bitcoin blockchain is a public ledger that records bitcoin transactions. It is implemented as a chain of blocks, each block containing a cryptographic hash of the previous block up to the genesis block[ in the chain. A network of communicating nodes running bitcoin software maintains the blockchain.: Transactions of the form payer X sends Y bitcoins to payee Z are broadcast to this network using readily available software applications." Now that you understand what it is, you can invest your life savings with confidence!
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