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Bitlayer Series (11): Bitcoin Rollup Architecture

Bitcoin Rollup Architecture: All state transitions are verified on Bitcoin to achieve hard finality.

Bitlayer, as the first Bitcoin-native Rollup, achieves Bitcoin-equivalent security through a hybrid architecture of BitVM2 + ZK proofs. Its dual-layer system combines a PoS high-throughput execution layer with a BitVM settlement layer, achieving over 5000 TPS performance while maintaining Bitcoin-level security, and realizing BTC native liquidity through trust-minimized bridging.

Bitlayer is positioned as a Bitcoin-native Rollup, with all L2 state roots ultimately written to the Bitcoin mainnet and subject to a 7-day challenge period for verification.

- The system adopts an innovative dual-layer architecture:

PoS Execution Layer: Provides sub-second soft confirmations, fully compatible with EVM.

BitVM Settlement Layer: Provides Bitcoin-level hard confirmations, ensuring final security.

- BitVM2 Integration Solution

Bitlayer utilizes the BitVM2 tech stack, splitting the Groth16 verifier into multiple "Segments" to ensure correctness through interactive fraud proofs:

Technical Component Implementation Solution Security Guarantee

Proof Splitting Segmented processing of Groth16 verifier Requires only 1 honest observer

State Connection HOTS (Hash Once Signature) connects continuous states Recursive verification with Bitcoin script

Dispute Resolution Pre-signed transaction graph (Taproot taptree) ≤3 rounds of messages to reach a decision