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Step 3 — Sign Payload

Sign the payload returned by Step 2.

Option A — Wallet Signing (EVM)​

const signature = await ethereum.request({
  method: 'personal_sign',
  params: [JSON.stringify(payload), walletAddress],
});

You can also sign evm_raw_payload if your wallet flow expects a preformatted message.

Option B — Backend Signing​

  1. Select the correct raw payload (evm_raw_payload or cosmos_raw_payload).
  2. Sign with your backend-managed key.
  3. Return signature and pub_key.
tip

For programmatic/private-key signing, sign the chain-specific raw payload directly (evm_raw_payload or cosmos_raw_payload), not a re-serialized payload object.

Output Needed For Step 4​

  • signature
  • pub_key
  • wallet_address
  • plus Step 2 values: payload, types, and optional meta

Next: Broadcast