The answer is Blockchain.
A blockchain is a continuously expanding list of documents, or blocks, that are safely connected to one another via encryption.
Each block includes transaction information, a timestamp, and a cryptographic hash of the preceding block (generally represented as a Merkle tree, where data nodes are represented by leafs).
For usage as a publicly distributed ledger, blockchains are often administered through peer-to-peer networks in which nodes collectively follow a protocol to communicate and validate new blocks.
Most cryptocurrencies use blockchain technology to record transactions.
For example, the bitcoin network and Ethereum network are both based on blockchain.
Hence, the name of the massive public online ledger which records the time and amount of every finalized cryptocurrency transaction is Blockchain.
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