Stacks is a permissionless Layer 2 that anchors all transactions to Bitcoin via Proof‑of‑Transfer consensus, delivering Bitcoin‑grade security for smart contracts written in the decidable Clarity language. It tokenizes Bitcoin as sBTC and enables Dual Stacking, allowing BTC holders to earn yields while securing the network, and provides developer SDKs, on‑chain indexing (Chainhooks), and native wallet integrations for building DeFi, NFT, and DAO applications.
Funding
Funding not disclosed
Founders
Product
Problem
Bitcoin’s base layer lacks native smart‑contract functionality, preventing developers from creating decentralized finance (DeFi) applications, tokenized assets, and other programmable services directly on the most secure blockchain. This limitation forces projects to rely on separate L1s or custodial bridges, which introduce additional trust assumptions and latency.
Solution
Stacks delivers a permissionless Layer 2 that anchors all transactions to Bitcoin via the Proof‑of‑Transfer (PoX) consensus mechanism, guaranteeing Bitcoin‑level finality and security. The platform introduces Clarity, a decidable, security‑first smart‑contract language that provides explicit state visibility on Bitcoin without hidden side effects. By tokenizing Bitcoin as sBTC (a 1:1 Bitcoin‑backed asset) and enabling Dual Stacking, Stacks lets users lock BTC on L1 while earning Bitcoin yields on L2, unlocking over $1 trillion of latent capital. Comprehensive developer toolkits, SDKs, and on‑chain indexing (Chainhooks) streamline dApp creation, while native wallet integrations (e.g., Xverse, Ledger) ensure seamless user onboarding. The ecosystem supports composable DeFi primitives, NFT standards (STX20), and DAO frameworks, all governed by on‑chain token economics.
Target Audience
Primary users are blockchain developers and DeFi engineers seeking to build secure, Bitcoin‑anchored applications, as well as Bitcoin holders who want to earn yields and access tokenized Bitcoin assets without leaving the Bitcoin ecosystem.
Features
- Proof‑of‑Transfer (PoX) consensus that leverages Bitcoin’s hash power to secure L2 blocks, providing Bitcoin‑grade immutability.
- Clarity smart‑contract language with static analysis, decidable execution, and explicit Bitcoin state reads for audit‑ready code.
- sBTC: a fully collateralized, 1:1 Bitcoin‑backed token enabling liquidity, lending, and cross‑chain composability without custodial risk.
- Dual Stacking mechanism allowing BTC holders to simultaneously secure the Stacks network and earn Bitcoin rewards on L2.
- Chainhooks 2.0 on‑chain indexing service that delivers real‑time event streams to off‑chain applications via low‑latency webhooks.
- Integrated wallet support (Xverse, Ledger, hardware wallets) and WalletConnect bridge for frictionless user authentication and transaction signing.
- Full suite of developer resources: SDKs (JavaScript, Rust), CLI tools, extensive documentation, and a public testnet for rapid iteration.
- Open APIs and FFI endpoints for querying Bitcoin state, token balances, and PoX participation metrics, enabling rich analytics and UI experiences.