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ZeroBridge

ZeroBridge

The Privacy Layer for Cross-Chain Liquidity

Created on 2nd December 2025

ZeroBridge

ZeroBridge

The Privacy Layer for Cross-Chain Liquidity

The problem ZeroBridge solves

Current blockchain bridges expose everything: your transaction amounts, wallet addresses, trading strategies, and holdings across all chains. Front-runners exploit this transparency, competitors copy your DeFi strategies, and your financial privacy is completely compromised. If you bridge 100 NEAR from Near to Solana, everyone can link your addresses, see your capital, and track your every move.

ZeroBridge solves this by routing all cross-chain transfers through Zcash's Orchard shielded pool, creating a privacy layer that breaks transaction graphs. When you bridge assets, they enter Zcash as encrypted notes that hide amounts, senders, and recipients. When you withdraw to the destination chain, zero-knowledge proofs verify ownership without revealing which deposit you're claiming. The result: your NEAR address and Solana address remain completely unlinkable, with no on-chain connection between them.

What You Can Do With ZeroBridge:

  • Private DeFi Across Chains - Deploy capital from Zcash to fresh addresses on any chain. Provide liquidity on PropellerSwap, AVNU, lend on Rhea Finance, or trade on Jupiter without revealing your total portfolio size or linking positions together. Each interaction appears as an independent user.

  • Protected Trading Strategies - Execute high-frequency trading or arbitrage without competitors tracking your moves. Fund bots from Zcash shielded pool to new addresses, run strategies at scale, aggregate profits privately. Front-runners can't target you because they can't see your capital or patterns.

  • Anonymous NFT Purchases - Buy NFTs without revealing your wallet's wealth. Bridge from Zcash to a fresh address with just enough funds, make your purchase, then bridge remaining balance back through a different route. The seller never sees your holdings.

  • Private Cross-Border Payments - Send value globally without surveillance. Bridge USDC from Solana through Zcash to NEAR in one flow—recipient gets funds from a fresh address with zero connection to your source wallet.

  • Institutional Privacy - Institutions can deploy capital across DeFi protocols without revealing their strategies or total AUM. Each position looks like a small independent player.

  • Making Privacy Accessible - No need to understand Zcash wallets or manage shielded addresses manually. Bridge in one transaction from any supported chain (Ethereum, StarkNet, Solana, NEAR, Mina, Osmosis), and ZeroBridge handles all Zcash shielded pool interactions automatically.

The system achieves true unlinkability - even if someone knows you deposited 100 OSMO, when you withdraw 50 SOL later, they cannot prove the connection. Your withdrawal could correspond to ANY previous deposit in the entire history of the bridge, creating an anonymity set of thousands of transactions.

Challenges I ran into

Challenge 1: Two-Step Withdrawal Pattern Discovery
My first implementation had users call a single withdraw() function with their proof. Relayers would listen, verify nothing, and immediately execute, creating a race condition where multiple relayers would waste gas attempting the same withdrawal. I initially tried complex P2P locking mechanisms, but they added fragility.
**Solution: Split withdrawals into two on-chain steps: requestWithdrawal() and executeWithdrawal(). **
Users submit proofs in step 1, which emits an event. The coordinator verifies the proof off-chain and, if valid, generates an authorization signature stored in its database. Relayers query this database for authorized withdrawals (not blockchain events), claim tasks via P2P gossip, then execute with the coordinator's signature. This eliminated race conditions, gave the coordinator time to verify proofs properly, and created a clean separation: users don't need to wait for verification (step 1 is instant), and relayers only execute pre-approved transactions. The pattern proved so elegant it became the standard across all eight gateway implementations.

Challenge 2: Cross-Chain Token Canonical Naming Nightmare
Different chains call the same token different things: USDC is 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48 on Ethereum, EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v on Solana, usdc.token.near on NEAR. Managing mappings manually in each gateway contract would be unmaintainable and error-prone.
Solution: Built a centralized token registry with canonical token IDs in the coordinator.
Each token gets a hash-based ID (e.g., sha256("USDC") -> 0x1f3a...) with a table mapping canonical IDs to chain-specific addresses. When processing deposits, the coordinator looks up the canonical token and ensures sufficient liquidity of the equivalent token exists on the destination chain before creating the Zcash note. This registry lives in a TOML config file (tokens.toml) that can be updated without redeploying contracts. Added benefit: the coordinator can automatically handle token decimals conversions

Tracks Applied (11)

Cross-Chain Privacy Solutions

ZeroBridge brings privacy-preserving account abstraction by routing wallet funding through Zcash, enabling features like...Read More
Starknet

Starknet

Cross-Chain Privacy Solutions

ZeroBridge includes a complete Mina Protocol gateway implemented as a zkApp using o1js and the Mina proof system. The co...Read More
Mina Protocol

Mina Protocol

Privacy Infrastructure & Developer Tools

ZeroBridge makes Zcash programmable through Mina: while Zcash only supports shielded transfers, Mina zkApps can encode a...Read More
Mina Protocol

Mina Protocol

Cross-Chain Privacy Solutions

ZeroBridge gateways inherit from AxelarExecutable, making them Axelar-aware smart contracts. When an Axelar message arri...Read More
Axelar Network

Axelar Network

Privacy Infrastructure & Developer Tools

ZeroBridge's core contribution is cross-chain privacy, our architecture demonstrates best practices for onboarding trans...Read More

Electric Coin Company

Cross-Chain Privacy Solutions

ZeroBridge includes a production-ready Osmosis gateway written in CosmWasm with full support for native OSMO deposits (v...Read More
Osmosis

Osmosis

Cross-Chain Privacy Solutions

ZeroBridge implements a complete Solana gateway using the Anchor framework, supporting both SOL and SPL token deposits t...Read More

Helius

Private DeFi & Trading

ZeroBridge provides the foundational infrastructure that makes private DeFi practical: Instead of building a new private...Read More

Unstoppable Wallet

Cross-Chain Privacy Solution

ZeroBridge enables structured private payment flows: businesses can receive payments from customers globally without rev...Read More

Bitlux

Privacy Infrastructure & Developer Tools

ZeroBridge's architecture demonstrates patterns for privacy-preserving development frameworks: the coordinator can verif...Read More

Raybot

Cross-Chain Privacy Solutions

ZeroBridge implements a production-ready NEAR gateway contract in Rust that handles both NEAR native token deposits and ...Read More
NEAR Protocol

NEAR Protocol

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