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Shroud Network

Privacy redefined with zero-knowledge proofs on Avalanche.

Shroud Network is a shielded pool privacy layer on Avalanche C-Chain. Users mint shielded tokens (zkTokens) against any ERC20 token at a 1:1 ratio. Inside the pool, all transfers are completely private — amounts, senders, and receivers are hidden. Only cryptographic commitments, nullifiers, and ZK proofs are visible on-chain.

What Shroud Network is NOT​

Shroud is not a mixer. Unlike Tornado Cash which uses fixed denominations and a deposit-wait-withdraw pattern, Shroud is a persistent shielded pool where tokens enter, circulate privately through unlimited transfers, and exit only when the owner decides.

How it works​

Public World                    Shielded Pool
─────────────                   ──────────────
ERC20 balance ──── deposit ────→ Commitment (hidden balance)
                                     │
                                     ├── private transfer → New Commitment
                                     ├── private transfer → New Commitment
                                     │
ERC20 balance ◄─── withdraw ───── Commitment consumed

On-chain observers can see: a new commitment added, an old commitment nullified, a ZK proof verified.

On-chain observers cannot see: the amount, who sent it, who received it, or any participant's balance.

Key properties​

PropertyDescription
PrivacyAmounts, senders, and receivers are hidden inside the pool
Self-custodyOnly the note owner can spend their shielded tokens
Verifiable solvencyPool total is always public: sum(deposits) - sum(withdrawals) = contract balance
Gasless transactionsOptional relay support — deposit and withdraw without holding AVAX
ERC20 compatibleWorks with any ERC20 token on Avalanche C-Chain

Cryptographic stack​

  • Pedersen commitments on Baby Jubjub — amount hiding with homomorphic balance verification
  • Poseidon hashing — Merkle tree, note commitments, nullifier derivation
  • Groth16 ZK proofs over BN254 — on-chain verification in ~450K gas

Network​

Shroud Network currently operates on Avalanche Fuji Testnet (Chain ID 43113).

Ready to get started? Head to the Quickstart guide.