Interoperability

zkBridge — Trustless Cross-Chain Interoperability

Bridge assets, trigger contract calls, and move data across blockchains without trusting a single third party. Zero-knowledge proofs replace multisigs and oracles — mathematically verified, immediately settled, and confidential by default.

Trustless Bridging

What Is zkBridge?

Zero-knowledge proof bridges that verify state transitions cryptographically — no multisig committees, no oracle networks, no trust assumptions

  • ZK-proof bridges to Ethereum & Polygon — verify the state of external chains using succinct zero-knowledge proofs. Instead of trusting a committee of signers or an oracle network, zkBridge mathematically proves that a transaction occurred on the source chain. The proof is verified on-chain, making the bridge as secure as the chains it connects.
  • Sync Committee verification — leverages Ethereum's Sync Committee protocol to track consensus state with minimal overhead. ZK proofs verify Sync Committee signatures, enabling lightweight but maximally secure verification of Ethereum state on ATSHI without running a full Ethereum node.
  • Secured relayer nodes — dedicated relayer infrastructure submits proofs and monitors both chains. Relayers are economically incentivized and slashable, but critically, they cannot forge proofs. A compromised relayer can delay but never steal — the math protects you, not the relayer's reputation.
  • Asset transfers + cross-chain contract calls — bridge not just tokens, but arbitrary data and smart contract invocations. Trigger an ATSHI smart contract from Ethereum, or execute an Ethereum transaction based on ATSHI state changes. True bidirectional interoperability.
  • Immediate finality on ATSHI side — while the source chain may require confirmations, the ATSHI side settles instantly via ARCH consensus. No waiting for block confirmations on the destination — your bridged assets are available the moment the proof is verified.
  • Modular architecture — new chains via governance — adding support for a new chain requires only a new verifier module and a governance vote. The bridge framework is chain-agnostic by design — any chain that can produce ZK-verifiable state proofs can be integrated.
  • FHE + ZK for confidential cross-chain transfers — combine Fully Homomorphic Encryption with zero-knowledge proofs to enable private cross-chain transfers. Prove that a transfer is valid without revealing amounts, addresses, or asset types. Confidential DeFi that spans multiple blockchains.

Bridge Architecture

Source Chain
→
ZK Proof Generation
→
Relayer
→
On-Chain Verification
→
Settlement
♦ Ethereum ♦ Polygon ♦ ATSHI + More via Governance
Cryptographic verification replaces trust — math secures every bridge transaction
Proofs ZK-SNARKs verify source chain state transitions
Settlement Immediate finality on ATSHI via ARCH consensus
Privacy FHE + ZK enables confidential cross-chain transfers
Scope Assets, data, and contract calls — not just tokens
Under the Hood

How zkBridge Works

A multi-layer verification pipeline that ensures every cross-chain message is cryptographically proven before execution

  • Step 1 — Event detection: Relayer nodes monitor the source chain for bridge-relevant events (lock, burn, message). Events are captured with full Merkle proof context, ensuring the event genuinely occurred in a finalized block.
  • Step 2 — Proof generation: A ZK circuit generates a succinct proof that the source chain event is valid. For Ethereum, this includes verifying Sync Committee signatures and block header chains. The proof is compact (<1 KB) regardless of the complexity of the underlying verification.
  • Step 3 — On-chain verification: The proof is submitted to the ATSHI bridge contract, which verifies it using an on-chain ZK verifier. Verification is computationally cheap and deterministic — either the proof is valid or it is not. No subjective judgment, no committee vote.
  • Step 4 — Execution: Upon successful verification, the bridge contract executes the corresponding action on ATSHI — minting wrapped assets, triggering contract calls, or forwarding messages. Settlement is immediate thanks to ARCH consensus.

Verification Pipeline

1 Event Detection — Relayers monitor source chain for bridge events
2 ZK Proof Generation — Succinct proof of event validity (<1 KB)
3 On-Chain Verification — Deterministic proof check on ATSHI
4 Execution — Mint, call, or forward with immediate finality
Result: Trustless, verifiable, and immediate cross-chain settlement
Why zkBridge

Advantages

Every cross-chain bridge promises interoperability. Only zkBridge delivers it without asking you to trust anyone.

🔒

No Trusted Third Party

Zero-knowledge proofs replace multisig committees and oracle networks. The bridge is secured by mathematics, not by the reputation or economic stake of intermediaries. A compromised relayer cannot forge a proof — ever.

ZK-Verified · Trustless
⚡

Immediate Settlement

ARCH consensus provides instant finality on the ATSHI side. The moment a ZK proof is verified, your assets are available. No waiting for additional confirmations, no probabilistic finality, no delay.

Instant Finality · No Waiting
🕵

Confidential Transfers

Combine FHE with ZK proofs to bridge assets privately. Prove that a transfer is valid without revealing amounts, addresses, or asset types. Confidential DeFi that works across chains.

FHE + ZK · Private
🚀

Modular Expansion

Adding a new chain requires only a verifier module and governance vote. The framework is chain-agnostic — Ethereum today, Polygon today, any ZK-compatible chain tomorrow. No protocol upgrade needed.

Chain-Agnostic · Governance
🔗

EVM Compatible

Full compatibility with Ethereum and EVM-based chains. Bridge ERC-20 tokens, interact with Solidity contracts, and leverage the entire EVM ecosystem from ATSHI. Familiar tools, trustless bridge.

EVM · Solidity · ERC-20
📝

Beyond Token Transfers

Bridge arbitrary data, trigger cross-chain contract calls, and synchronize state across blockchains. zkBridge is a general-purpose cross-chain messaging layer, not just a token bridge.

Messages · Calls · Data
How We Compare

Cross-Chain Bridges Compared

Most bridges rely on trusted intermediaries — multisig wallets, oracle committees, or validator sets. zkBridge is the only solution that replaces all trust assumptions with zero-knowledge proofs.

Feature Wormhole LayerZero Axelar Cosmos IBC ATSHI zkBridge
Trust Model Guardian multisig (19 signers) Oracle + Relayer (configurable) Validator set (dPoS) Light client verification ZK proofs — fully trustless
Verification Multisig Oracle-based Validator vote Light client Zero-knowledge proof
Confidential Transfers No No No No FHE + ZK private bridging
Settlement Speed ~15 min (finality dependent) ~10 min ~30 sec ~6 sec (Cosmos side) Immediate on ATSHI side
Cross-Chain Calls Limited Yes (OApp messaging) Yes (GMP) IBC packets Full contract calls + data
Adding New Chains Core team deployment Endpoint deployment Validator governance IBC implementation required Verifier module + governance vote
Attack Surface Compromise 13/19 guardians Compromise oracle + relayer Compromise validator majority Light client forgery (very hard) Break ZK cryptography (impossible)
EVM Support Yes Yes Yes Limited (via IBC-EVM) Full EVM compatibility
Historical Exploits $325M hack (2022) No major exploit No major exploit No major exploit Mathematically unexploitable

Bridge Without Trusting Anyone

The era of trusted bridges is over. Every multisig committee is a single point of failure waiting to be exploited. zkBridge replaces human trust with mathematical certainty — zero-knowledge proofs that are as secure as the underlying cryptography itself. Bridge your assets, trigger cross-chain calls, and move data with confidence. The math protects you.

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