Layer 1 Blockchain is the main network on which a blockchain operates. Bitcoin and Ethereum are Layer 1 blockchains—they are self-contained systems with their own rules and processes for validating transactions.
Layer 1 blockchains maintain three core features: a consensus mechanism (such as Proof of Work or Proof of Stake) that confirms transactions across the network, decentralization that spreads control among many participants, and security that protects against fraud. All transactions are processed directly on the main chain, which means the network handles validation, settlement, and record-keeping.
As a Layer 1 blockchain grows and processes more transactions, network congestion increases. Higher transaction volume leads to longer wait times and higher fees. This is the core scalability challenge—the more decentralized a blockchain remains, the slower and more expensive it becomes. Many blockchains use Layer 2 solutions (off-chain networks built on top of Layer 1) to address this by moving some transactions off the main chain.
For traders, Layer 1 blockchains matter when trading crypto assets. Higher fees and slower settlement during congestion periods affect your entry and exit costs. Understanding which blockchain a cryptocurrency runs on helps you anticipate when trading costs will rise.
