Blockchain

The blockchain is a digital ledger that records transactions in a secure and decentralized manner. Think of it like a shared spreadsheet that is constantly being updated by a network of users. Each block in the chain contains a unique code that links it to the previous block, creating a permanent and tamper-resistant record of every transaction ever made. Because no single entity controls the ledger, it is nearly impossible for any one party to alter historical records without the consensus of the entire network.

Blockchains are maintained by a distributed network of computers, called nodes, each of which holds a full or partial copy of the ledger. When a new transaction is submitted, nodes work to verify its validity before it is grouped with other transactions into a block and appended to the chain. This verification process — whether through Proof-of-Work mining or Proof-of-Stake validation — ensures that only legitimate transactions are recorded.

For traders and developers, the blockchain is foundational infrastructure. It enables trustless transactions between parties who may not know or trust each other, eliminates the need for intermediaries like banks, and provides a transparent audit trail. In algorithmic trading, understanding blockchain mechanics — such as block times, transaction finality, and network congestion — is essential for designing strategies that interact with on-chain assets reliably.