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Blockchain
A distributed ledger that keeps track of transactions
Everyone on the blockchain network maintains the ledger
- Records and replicates to anyone and everyone
Many practical applications
- Payment processing
- Digital identification
- Supply chain monitoring
- Digital voting
The blockchain process
A transaction is requested
The transaction could be any digital transaction from transferring bitcoin, medical records, data backups, or transferring house title information
The transaction is sent to every computer/node
A secure code (A hash) is calculated from the previous blocks of transaction data in the Blockchain
The hash is added to the new block of verified transactions
If any blocks are altered, its hash and all following hashed in the chain are automatically recalculated
The altered chain will not longer match the chains stored by the rest of the network, and will be rejected
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