Blockchain is a decentralized infrastructure software where it can run without a centralized entity that controls the blockchain infrastructure

Blockchain is also a ledger-proof ledger or arrangement of data arranged in a series of “blocks” interrelated with one another in another Block Chain called Chain. These blocks are added according to a special set of rules (known as a consensus algorithm)

Blockchain can also be defined in many ways but all of them have the same attributes which are decentralized, immutable, traceable, and transparent

Transactions recorded on the blockchain make up the eternal history of the blockchain. Every transaction or change in blockchain history can be tracked and can be audited, thus creating a transparent blockchain history

Blockchain technology or in the Indonesian dictionary “block chain” actually has a long history and passed several technological iterations before Satoshi Nakamoto published a bitcoin whitepaper based on the blockchain.

Satoshi at that time, thought of how people could send money peer to peer without going through a middleman or intermediary, which was motivated by the fall of Lehmann Brothers, which was the top 5 bank in the US.

At that time he copied a database that was previously only controlled by a handful of people (centralized), copied identical to many places that functioned as validators, which are currently on the blockchain other than Bitcoin, commonly called block producers. See the visualization below (check also next slide)