Comparison

QuanChain vs Ethereum

Q: How does QuanChain compare to Ethereum Layer 2 solutions?

Ethereum Layer 2 solutions like Optimism, Arbitrum, and zkSync achieve higher throughput than Ethereum's base layer by batching transactions and posting proofs back to Ethereum. However, they inherit Ethereum's quantum vulnerability — both in the base layer security model and in the ECDSA-based wallets users sign transactions with. QuanChain provides quantum resistance at the base layer itself, meaning both the consensus and the wallet model are secure against Shor's algorithm without relying on a separate settlement layer.

Q: What does Ethereum's post-quantum roadmap look like?

Ethereum's post-quantum migration is part of The Splurge, the final phase of the Ethereum roadmap. Vitalik Buterin has written about using ERC-4337 account abstraction to allow wallets to switch to post-quantum signature schemes, and has proposed a quantum emergency recovery mechanism. However, the migration path for existing non-smart-contract wallets with exposed public keys remains unsolved. QuanChain was built with quantum resistance as a day-zero design constraint, avoiding the retrofit challenge entirely.

Quantum-resistant Layer 1 vs the leading smart contract platform.

Ethereum is the dominant smart contract platform: it hosts the largest DeFi ecosystem, the most active developer community, and the most mature tooling in the industry. But Ethereum's ECDSA-based wallet model exposes public keys on-chain with every transaction, and the post-quantum migration — while on the roadmap — has no committed timeline. QuanChain offers EVM-compatible smart contract execution on a chain where quantum resistance is built into the wallet architecture from day zero, not retrofitted.

Dimension	QuanChain	Ethereum
Quantum resistance	Full (TADEQS + PQC signatures)	None — ECDSA vulnerable to Shor's algorithm
Smart contract throughput	15,000+ TPS (Channel 2)	~30 TPS (L1)
Payment throughput	200,000+ TPS (Channel 1)	~30 TPS (L1)
Finality	~400ms (deterministic)	~12 min (probabilistic)
EVM compatibility	Yes (Channel 2, Hardhat preset)	Native EVM
Key exposure	No public key ever on-chain (TADEQS)	Public key exposed on first transaction
Post-quantum migration plan	Built-in from day zero	On roadmap (The Splurge), no committed date
Ecosystem maturity	Early stage, testnet live	Largest smart contract ecosystem
Developer tooling	QuanChain SDK, Hardhat preset, testnet	Largest dev tooling ecosystem (Foundry, Hardhat, etc.)
Data efficiency	70% smaller on-chain footprint (TADEQS compression)	Standard Ethereum transaction size
Consensus	Proof of Coherence (stake + performance)	Proof of Stake (LMD-GHOST + Casper FFG)

Ethereum's Quantum Vulnerability

Every Ethereum externally owned account (EOA) — the wallets used by individual users — derives its address from an ECDSA public key. The first time an EOA sends a transaction, the public key is broadcast to the entire network and permanently recorded. That public key is the exact input Shor's algorithm needs to derive the private key. Ethereum's roadmap includes a path to post-quantum migration via account abstraction (ERC-4337), but migrating 200+ million existing wallets — many of which have lost or inactive owners — is an unsolved problem. QuanChain solves this by ensuring no public key is ever published: TADEQS wallets expose only address hashes, not keys.

Smart Contracts: 15,000 TPS vs 30 TPS

Ethereum's base layer processes approximately 30 transactions per second — a ceiling that has driven enormous investment in Layer 2 scaling solutions. QuanChain's Channel 2 processes 15,000+ smart contract transactions per second natively, without requiring separate rollup infrastructure or bridging friction. Channel 2 is EVM-compatible: existing Solidity contracts can be deployed on QuanChain using the QuanChain Hardhat preset with minimal modifications. Cross-channel atomic transactions allow a single user operation to span a Channel 1 payment and a Channel 2 contract call, composing them with atomic guarantees.

What Ethereum Gets Right

Ethereum's developer ecosystem is unmatched. Foundry, Hardhat, Ethers.js, Wagmi, and hundreds of audited open-source contracts represent a tooling advantage that took years to build. The Ethereum Foundation's research output on cryptography, consensus, and scalability is also a genuine public good. QuanChain's EVM compatibility is a deliberate acknowledgement of this: rather than requiring developers to learn an entirely new execution model, QuanChain lets Ethereum developers bring their existing Solidity knowledge and tooling to a quantum-resistant chain. The QuanChain SDK handles the TADEQS wallet abstraction, so contract logic does not need to change.

QuanChain vs Ethereum — Common Questions

Is Ethereum quantum resistant?

No. Ethereum uses ECDSA (secp256k1) for transaction authorisation. Public keys are exposed on-chain whenever an externally owned account sends a transaction. The Ethereum roadmap includes a post-quantum migration as part of The Splurge phase — but no concrete migration date has been finalised. The 'harvest now, decrypt later' threat applies to all existing Ethereum transaction history.

Is QuanChain EVM compatible?

QuanChain's Channel 2 supports EVM-compatible smart contract execution at 15,000+ TPS. Solidity contracts can be deployed with minimal modifications using the QuanChain Hardhat preset. Cross-channel transactions allow Channel 1 payments and Channel 2 contract calls to be composed atomically.

How does QuanChain compare to Ethereum Layer 2 solutions?

Ethereum Layer 2 solutions (Optimism, Arbitrum, zkSync) batch transactions and post proofs to Ethereum's base layer, but they inherit Ethereum's quantum vulnerability in the base layer security model and in the ECDSA wallets users sign with. QuanChain provides quantum resistance at the base layer — both consensus and wallet architecture are secure against Shor's algorithm without a separate settlement layer.

What does Ethereum's post-quantum roadmap look like?

Ethereum's post-quantum migration is part of The Splurge. Proposals include using ERC-4337 account abstraction to allow wallets to switch to post-quantum signature schemes. However, the migration path for existing non-smart-contract wallets with exposed public keys remains unsolved. QuanChain was built with quantum resistance as a day-zero design constraint, avoiding the retrofit challenge entirely.