How Does Quai Network Work?
Quai Network is a Proof-of-Work Layer 1 blockchain using a novel consensus called POEM (Proof of Entropy Minima) that enables hierarchical sharding — running multiple parallel chains simultaneously for high throughput while maintaining merged mining security. The architecture includes a three-tier zone hierarchy (Prime, Region, Zone) where all zones share PoW security. Quai also includes QI, an algorithmic stablecoin collateralized by QUAI tokens. The PoW approach is philosophically aligned with Bitcoin maximalism but faces scaling questions, and the QI stablecoin model shares structural similarities with LUNA/UST.
TVL
$25M
Sector
L1
Risk Grade
C
Value Grade
C
Core Mechanisms
Consensus > PoW
NovelPOEM (Proof of Entropy Minima) multi-shard merge mining
Novel PoW variant enabling hierarchical sharding with merged mining security
Sharding > Hierarchical
NovelThree-tier zone hierarchy (Prime > Region > Zone)
Novel three-tier zone architecture enabling parallel transaction processing
Bridge > Cross-Shard
NovelAsync cross-shard transactions via coincident blocks
Novel mechanism for cross-shard atomicity using coincident block timing
Token > PoW Native
QUAI token with PoW issuance and QI stablecoin
Dual-token system with mineable QUAI and qi algorithmic stablecoin
Execution > EVM-Compatible
SolidityX (extended Solidity) for cross-shard smart contracts
Extended Solidity with cross-shard transaction primitives
How the Pieces Interact
Shard reorganization across hierarchical zones creates inconsistent state views and enables double-spend attacks
Miner concentration in high-tier zones (Prime) enables selective censorship across all subsidiary zones
Death spiral between QI stablecoin and QUAI collateral mirrors LUNA/UST — algorithmic stablecoin structural risk
Novel cross-shard transaction primitives create reentrancy-equivalent vulnerabilities in async cross-zone calls
What Could Go Wrong
- Novel POEM consensus with merge mining is untested at scale under adversarial conditions
- Cross-shard communication adds complexity — shard state inconsistency is a known hard problem
- PoW revival faces headwinds from environmental criticism and miner incentive alignment challenges
- Limited mainnet history with small validator/miner community increases concentration risk
Cross-Shard Double Spend via Zone Reorganization
TailTrigger: Attacker with sufficient hash rate performs selective zone reorganization to double-spend assets transferred across shards
- 1.Attacker mines alternative zone chain with sufficient PoW to trigger reorganization — Zone-level reorg invalidates cross-shard transactions confirmed in original chain
- 2.Cross-shard transfer appears confirmed on destination but reversed on source — Double-spend achieved; attacker has assets on both chains simultaneously
- 3.Community detects inconsistency; bridge protocols pause; trust in cross-shard security undermined — DeFi protocols pause withdrawals; TVL exodus; QUAI price collapses
Risk Profile at a Glance
Overall: C (47/100)
Lower score = safer