Stacks is a leading Layer 2 network built specifically for Bitcoin. It adds smart contract capabilities to the Bitcoin ecosystem while inheriting the security benefits of the Bitcoin network. The name "Stacks" is an acronym representing its key features:

• S: Secured by the entire hash power of Bitcoin
• T: Trust-minimized Bitcoin peg mechanism
• A: Atomic BTC swaps and assets owned by BTC addresses
• C: Clarity language for safe, decidable smart contracts
• K: Knowledge of full Bitcoin state
• S: Scalable, fast, cheap transactions that settle on Bitcoin

These features make Stacks unique among Layer 2 solutions, especially its ability to interact directly with the Bitcoin blockchain.