crossbridge
bridging your sol asset from svm to evms
Created on 3rd December 2025
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crossbridge
bridging your sol asset from svm to evms
The problem crossbridge solves
Problem:
Today, when you bridge tokens from Solana to any EVM chain (Ethereum, Arbitrum, Base, Polygon, etc.), the entire transaction history is public. Anyone can trace exactly how much you moved, from which wallet, to which wallet – forever. This kills privacy for DeFi users, whales, institutions, and everyday traders.
Our Solution:
A zero-knowledge cross-chain bridge that gives users real Zcash Orchard-level privacy the moment they lock funds on Solana.
What people can now do (that was impossible or extremely painful before):
Bridge millions in SOL → wSOL on Ethereum without revealing the amount or linking sender/receiver
Hide trading strategies when moving between Solana DeFi and EVM DeFi
Protect personal wealth from on-chain surveillance, doxxing, or front-running
Comply with privacy regulations while still using fast, cheap Solana entry/exit
Use the same privacy guarantees that Zcash users have enjoyed for years – but now across 50+ EVM chains
Challenges I ran into
Zcash Backend Client Was Too Slow and Heavy for Hackathon Timeline: The initial plan was to use zcash_client_backend for full Zcash privacy (scanning notes, generating proofs). It worked in theory, but setup took days (gRPC endpoints, node sync), and each private transaction added 5–12 seconds for proof gen + 20-block delay for mixing. For a fast hackathon demo, this killed UX.
How I got over it: I reverted to Zcash primitives (zcash_primitives) for offline math on Solana. But primitives lacked direct nullifier/commitment functions—the docs/samples were outdated (Sapling-focused, no Orchard). After digging ZIP-244, I switched to orchard crate (official for 2025 Zcash). It gave real commitments/nullifiers in ~0.01ms offline. Integrated into the LockEvent emission, and demo was instant. No chain, no delay—just Zcash math.
Tracks Applied (4)
General Bounty
Network School
Cross-Chain Privacy Solutions
Osmosis
Cross-Chain Privacy Solutions
Helius
General Bounty
Project Tachyon