How can records on blockchain be altered

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For example, the miners can does not appear that blockchain the blockchain, referred to as records and health databases, and exchanges.

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How Blockchain Technology Could Change Healthcare
An immutable ledger in blockchain refers to any records that can remain unchanged. It cannot be altered, so the data cannot be easily changed. Immutability. Blocks record and confirm the time and sequence of transactions, which are then logged into the blockchain, within a discrete network governed by rules agreed. Once a blockchain records data, it cannot alter or delete it without leaving a permanent and transparent record of the change. This provides.