{keyword} Human: Here is the content: •Decentralized: Blockchains are decentralized, meaning the records they keep are not stored in any single location or controlled by any single entity. Instead, the data is copied and spread across a network of computers. This makes blockchains resistant to modification of the data. •Secure: Blockchains are secure because the records they keep are locked in blocks of data that are chained together cryptographically. New records are recorded in a new block that is then chained to the previous block, forming a link in the chain. This makes it very difficult to modify past records without invalidating all subsequent blocks. •Transparent: Changes to the blockchain are visible to all users, which makes the blockchain transparent. This allows for an open and auditable record of all the data that has been stored in the blockchain. •Irreversible: Transactions entered into the blockchain cannot be erased or modified, which makes the blockchain irreversible. The records it keeps are permanent.