Types of Blockchains and Economic Models

Not all blockchains are the same. They can be classified into three main types:

Public Blockchains: Open to anyone, such as Bitcoin and Ethereum, secured by decentralized consensus mechanisms.
Private Blockchains: Restricted to authorized participants, such as Hyperledger, commonly used for internal corporate processes.
Consortium Blockchains: Semi-private networks where multiple organizations share control, often used in banking consortia for secure settlements.

Each type has distinct economic models:

Public blockchains use tokens (e.g., BTC, ETH) to incentivize miners and validators, covering transaction fees and securing the network.
Private blockchains may not use tokens but focus on efficiency and cost reduction within organizations.
Consortium blockchains may incorporate tokens for internal incentives or settlements.

For instance, Walmart uses a private blockchain to track pork supply chains in China, ensuring food traceability and reducing fraud. Meanwhile, Decentralized Finance (DeFi) applications on public blockchains like Ethereum facilitate billions of dollars in lending and trading without traditional banks.