Cross-chain identity · Arbitrum Stylus
Your identity,
across chains.
Prove ownership of a wallet from another ecosystem without bridging your assets. CrossSign verifies your signature on-chain, on Arbitrum.
- signature scheme
- Ed25519
- assets bridged
- 0
- transaction to verify
- 1
Verification flow — tap to replay
SOLANA WALLET
Phantom, Solflare, Backpack…
SIGN
Ed25519
CROSSSIGN
Protocol
ARBITRUM
Stylus
VERIFIED
Badge issued
Solana → sign → verify on Arbitrum — no funds move
Why CrossSign
Proof, without the friction.
Cross-signing replaces bridges and manual attestations with a single verifiable signature.
No bridge
No assets need to move. A single cryptographic signature is all it takes to prove control of your wallet.
On-chain proof
Verification happens on Arbitrum, verified by the Stylus verifier contract. Nothing lives off-chain.
Reusable identity
Other apps can recognise the same proof. Verify once, and carry your badge across the ecosystem.
How it works
Four steps. One proof.
Select a step to follow what happens at each stage of a verification.
Awaiting next stage
Under the hood
Verification that doesn't trust the middleman.
CrossSign uses Stylus — Arbitrum's Rust-based VM — to verify Ed25519 signatures on-chain. The EVM cannot do this natively; CrossSign can.
What we verify
Cryptographic control of a wallet — that you hold the key that produced a signature.
What we never claim
Real-world identity. CrossSign proves wallet ownership, not who you are.
Why Stylus
Rust on-chain| Method | CrossSign (Stylus) | Plain EVM |
|---|---|---|
| Signature scheme | Ed25519 (Solana wallets) | secp256k1 (ecrecover) only |
| Where it runs | On-chain — Stylus (Rust → WASM) | In Solidity, if at all |
| Native Ed25519 | Yes — ed25519-dalek | Not supported |
| Verification + mint (badge #2) | 470,424 gas (≈0.0000835 ETH) | No equivalent benchmark measured |
Built for the Arbitrum Open House Singapore
CrossSign is an entry in the Arbitrum Open House Singapore — Online Buildathon, built on Stylus with Ed25519 verification running on-chain.
Verify a wallet in under a minute.
No bridge. No funds moved. Just a signature that proves control of your wallet — verified on Arbitrum.
Works with Phantom, Solflare, Backpack + more · No seed phrase required · No funds move