bit2coin Consensus (Draft)

Goal: Bitcoin-like chain with PoS security, explicit finality, and much lower energy.

High-level design

• Proposer selection: VRF-based lottery among eligible validators, stake-weighted.
• Finality: BFT-style (e.g., Tendermint-like) or FFG-like checkpoint finality with ≥2/3 voting power.
• Slashing: Double-sign and surround-vote slashing; inactivity leak under low participation.
• Weak subjectivity: Periodic checkpoints; bootstrap rules documented for nodes and exchanges.

Validator lifecycle

• Bond stake → warm-up period (e.g., 7 days) → eligible to propose/attest.
• Unbonding delay (e.g., 21–28 days) with withdrawal queue.
• Rewards distributed each epoch to proposers and attestors; penalties for faults.

Block structure (additions)

• Header includes: proposer address, VRF output + proof, commit of attestation set, and finality status.
• Body includes: transactions, staking ops (bond/unbond/delegate), and slash proofs.

Fork choice

• Prefer highest finalized checkpoint; otherwise, highest justified/locked commit with tie-breaker by VRF randomness.

Security notes

• Randomness: on-chain VRF with verifiable proofs to prevent grinding.
• DOS resistance: signature/VRF verification limits, mempool/peer scoring.
• Client diversity and audits recommended pre-mainnet.