Think of layer 1 as the foundations and load-bearing walls of a building. It defines what a valid transaction looks like, how <a href="/glossary/consensus/">consensus</a> is reached about which block comes next, how new coins are issued, and what the fees are paid in. Its native coin exists to pay those fees and to reward the validators or miners who keep the ledger honest. Change any of these rules and you are changing the chain itself, which is why upgrades are slow and contested.
The reason layer 1 design is argued about so much comes down to a stubborn trade-off between three goals: keeping the network decentralised, keeping it secure, and making it fast. Raising throughput usually means bigger blocks or heavier hardware, which makes running a <a href="/glossary/node/">node</a> more expensive and pushes the network towards fewer, larger operators. Different chains resolve that tension differently, and those choices explain most of the visible differences in fees and speed between them.
Two points cause regular confusion. First, a token issued on a chain is not itself a layer 1; only the network with its own consensus and validator set counts. Second, calling a chain a "layer 1" says nothing about how good or secure it is, because a network with few independent validators is a base chain with weak foundations. When comparing chains, look past the marketing at who validates, how many of them there are, and what happens if a handful of them collude. That is also why so much scaling work has moved to <a href="/glossary/layer-2/">layer 2</a>.
Key takeaways
- A layer 1 supplies its own security and consensus, which is exactly what a layer 2 borrows instead of building.
- Higher throughput is usually bought by raising the cost of running a node, which quietly reduces how decentralised a chain is.
- The label says nothing about quality, so judge a base chain by the size and independence of its validator set.
Layer 1 — frequently asked questions
Is a token like an ERC-20 a layer 1?
No. An <a href="/glossary/erc-20/">ERC-20</a> token lives inside smart contracts on a host chain and inherits that chain's security, consensus and fees entirely. It has no validators of its own. Some projects begin life as a token and later launch their own network, at which point they become a layer 1 and holders are usually asked to migrate.
Why not just make the base chain faster instead of adding layer 2s?
Because speed on the base layer has a price. Processing far more transactions means every node must store and verify far more data, so fewer people can afford to run one, and the network ends up in fewer hands. Moving activity to a second layer keeps the base chain light enough for ordinary participants to verify while still settling disputes underneath.
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