Bitcoin L2s are becoming a hot topic in the Twitter-verse and investment space. But, no one really knows what a Bitcoin L2 is.

This documentation site proposes a framework to classify L2s and layers, which would ultimately help users understand the trust assumptions they’d take on with these systems.

In short, Bitcoin L2s are separate protocols that have a trust-minimized bridge that enables unilateral exit. Bitcoin Layers are protocols, onchain or offchain, that provide more utility to BTC asset or pay fees to Bitcoin miners.

In the following pages, we dive deeper into what these definitions mean, and how we can classify Bitcoin Layers.

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