Layer 1 cryptocurrencies are digital assets that operate on their own independent blockchain networks. A Layer 1 blockchain provides the basic infrastructure needed to record transactions, maintain a distributed ledger, validate activity, and create decentralised applications. Unlike Layer 2 networks, which are built on top of existing blockchains, Layer 1 networks have their own consensus mechanisms, validators, and native tokens.

Bitcoin and Ethereum are well-known examples of Layer 1 blockchain ecosystems. Other networks, such as Solana, Avalanche, and Cardano, also operate as Layer 1 platforms, although their technologies and design approaches differ. Their native cryptocurrencies can be used for transaction fees, network security, staking, governance, or other functions within their ecosystems.

One important characteristic of Layer 1 networks is their consensus mechanism. Some use proof-of-work, while others use proof-of-stake or variations of it. The consensus system determines how transactions are validated and how the network reaches agreement without relying on a central authority.

Layer 1 blockchains also face challenges involving scalability, transaction speed, fees, and network congestion. When demand becomes high, transaction costs may increase, or processing may become slower, depending on the network's design. Developers may address these limitations through protocol upgrades, improved consensus mechanisms, or scaling solutions.

Understanding Layer 1 cryptocurrencies is useful because they form the underlying foundation for many blockchain applications and digital-asset ecosystems. Their performance, security, decentralisation, and development activity can influence the broader blockchain environment and the applications built on top of these networks.