If you’ve been exploring Hyperliquid’s multisig feature and want to avoid using Python SDKs or offline signing — good news: you can do everything from the UI. This guide walks you through the full process, based on real-world experience.

👉 If you’re new to Hyperliquid, feel free to join using this invite link:
https://app.hyperliquid.xyz/join/MATSUBARA

✅ What You’ll Need

• Rabby Wallet (latest version recommended)
• Your Hyperliquid account must already be Vault-enabled
• At least 2 authorized signers and a lead (transaction sender) wallet
• Add HyperEVM to your wallet with the following config:

Network Name: Hyperliquid
RPC URL: https://rpc.hyperliquid.xyz/evm
Chain ID: 999
Currency Symbol: USDC（HYPE）

🧩 Key Clarifications

• ✅ It’s okay if the signing prompt says “Arbitrum” — just proceed with signing.
• ✅ You should click “Switch to Arbitrum” if the UI prompts it. It works fine.
• ✅ The signer addresses must match case-sensitive format (avoid auto-lowercase).
• ✅ Nonce values must match across all signatures — this is critical for success.

🔧 Step-by-Step: Signing & Sending Multisig from UI

1. Generate Signature 1

• Connect the first signer’s Rabby wallet.
• Go to Vault UI.
• Click “Generate Signature 1”.
• Sign the transaction — even if prompted to switch to Arbitrum.
• Copy the signature and the wallet address.

2. Generate Signature 2

• Switch to the second signer wallet.
• Click “Generate Signature 2”.
• Again, sign — Arbitrum will appear, and it’s totally fine.
• Copy the second signature and address.

🧠 Note: The nonce must be identical for both signatures. You can get it from the UI before signing.

3. Send with Lead Wallet

• Switch to the lead wallet (transaction sender).
• Paste both signatures and both signer addresses into the fields.
• Use “Copy address” buttons from wallet — address casing must match exactly.
• Click “Send MultiSig” to complete.

🎯 Final Tips

• Don’t worry if you see “Arbitrum” during signing — it’s valid.
• Clicking “Switch to Arbitrum” is safe and recommended.
• Case-sensitivity matters — use Copy Address buttons.
• If signature fails, double-check that nonce matches and signer addresses are correct.

🔗 Join Hyperliquid with My Referral

If you’re not using Hyperliquid yet, you can join using my invite:
👉 https://app.hyperliquid.xyz/join/MATSUBARA

Let’s build securely with native multisig on-chain.