Stacks Stacks is a Bitcoin Layer 2 for smart contracts. Original 2017 ("Blockstack"), launched mainnet 2021. Major upgrade Nakamoto (2024) added near-instant finality and sBTC . Architecture - Separate chain : Stacks blocks reference Bitcoin blocks. - Anchored : Stacks block hashes committed to Bitcoin via PoX. - Smart contracts : written in Clarity (Stacks-specific lang). - Native token : STX (used for fees, governance, staking). - Native BTC peg : sBTC — 1:1 BTC-pegged asset on Stacks. PoX (Proof of Transfer) Consensus mechanism: - Stacks miners burn STX (or send BTC, varies by epoch). - Mi…