What Is a Bitcoin Layer 2?

Bitcoin layer 2 solutions are offchain networks, systems, or technologies built on top of the Bitcoin blockchain to enhance its capabilities and address its scalability challenges. Since Bitcoin's inception in 2008, its growth has been hindered by limited scalability, high transaction fees, and network congestion, particularly exacerbated by recent developments like ordinals and BRC-20 tokens. Layer 2 solutions such as state channels, sidechains, and rollups aim to increase transaction throughput, reduce fees, and introduce smart contract programmability while inheriting Bitcoin's security. These solutions work by moving transaction processing off the main blockchain and settling them back in a secure way, allowing for greater scalability and usability without altering the core Bitcoin network's security or decentralization. The emerging ecosystem of Bitcoin layer-2 scalability solutions is also seeing a growing integration with the Chainlink platform, which provides high-quality data and oracle services, helping to accelerate adoption and increase developer activity in the Bitcoin ecosystem.

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