Layer 1 cryptocurrencies, also known as base layer or mainnet cryptocurrencies, are the foundational blockchains upon which other protocols and applications are built. Here are some of the main Layer 1 cryptocurrencies and their respective launch years:

1. Bitcoin (BTC) - 2009

2. Ethereum (ETH) - 2015

3. Ripple (XRP) - 2012

4. Litecoin (LTC) - 2011

5. Cardano (ADA) - 2017

6. Polkadot (DOT) - 2020

7. Solana (SOL) - 2020

8. Avalanche (AVAX) - 2020

9. Binance Smart Chain (BSC) - 2020

10. Tezos (XTZ) - 2018

11. Algorand (ALGO) - 2019

12. Cosmos (ATOM) - 2019

These Layer 1 blockchains provide the infrastructure for decentralized applications (dApps), smart contracts, and other Layer 2 solutions to operate on top of them.

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