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If Phantom displays a warning when you sign a transaction on your domain, follow these steps:
  • Limit the transaction to one signer.
  • If the transaction requires multiple signers, sign it with Phantom first using signTransaction instead of signAndSendTransaction, then collect signatures from the other signers.
  • If your transaction approaches Solana’s size limit, split it into multiple signing requests or use Address Lookup Tables.
  • Before submitting the transaction for signing, simulate the transaction with sigVerify: false using your RPC node to ensure they will not fail onchain. Failed transactions could trigger simulation warnings.
If you have made these changes and the warning persists, or if you cannot apply these changes, contact our domain review team using this form.