Getting error when using SignAndSendTransaction Deeplink method on Phantom

[Sotatek-JamesNguyen6]

Summary

Hello,

I'm building an Expo app and I'm following this guide to sign and send transaction via Deeplink: https://docs.phantom.com/phantom-deeplinks/provider-methods/signandsendtransaction

When attempting to open the SignAndSendTransaction Deeplink, it navigates me to Phantom and quickly redirects back to my app.

From the redirect url, i can see the errorCode=-32603 and errorMessage=Unexpected+error, which in this page means it's an Internal Error - Something went wrong within Phantom.

Please help to identify and resolve the issue.

Example

No response

Steps to Reproduce

I followed the logic implemented in this repository: https://github.com/phantom/deep-link-demo-app

• I was able to connect to Phantom successfully using the connect() function and received the shared secret, public key and session data.
• This is the function that i used to open the SignAndSendTransaction Deeplink:

const signAndSendTransaction = async (transaction: Transaction) => {
    const serializedTransaction = transaction.serialize({
      requireAllSignatures: false,
    });

    const payload = {
      session: session
      transaction: bs58.encode(serializedTransaction),
    };

    const [nonce, encryptedPayload] = encryptPayload(
      payload,
      sharedSecret
    );

    const params = new URLSearchParams({
      dapp_encryption_public_key: bs58.encode(dappKeyPair.publicKey),
      nonce: bs58.encode(nonce),
      redirect_link: onSignAndSendTransactionRedirectLink,
      payload: bs58.encode(encryptedPayload),
    });

      const url = buildUrl({
        walletType,
        path: RequestRoutes.SignAndSendTransaction,
        params,
      });

      Linking.openURL(url);
  };

This is the deeplink url that was used:
https://phantom.app/ul/v1/signAndSendTransaction?dapp_encryption_public_key=Fx2EzSrokFtuPwkHT1zRFTBx4yc5XyP6XPPCTa1DcQjz&nonce=FEenX5r1RGZiygmecFoMHDfxJc34RMPLG&redirect_link=myapp%3A%2F%2F%2Fevents%3FredirectRoute%3DonSignAndSendTransaction&payload=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

The redirect_link is: myapp:///events?redirectRoute=onSignAndSendTransaction&errorCode=-32603&errorMessage=Unexpected+error

Phantom Version

Phantom 25.7.0 on Android

Is there an existing discussion for this?

• I have searched the existing discussions

[adamdelphantom]

Hey @Sotatek-JamesNguyen6,

I believe your redirect is not encoded properly. You can see an example here.

For more specific information check your phantom application logs by triggering the deeplink then going to Settings > Security & Privacy and download logs. You should be able to see a more specific error there for more guidance.

[Sotatek-JamesNguyen6]

@adamdelphantom the redirect_link as query string parameter is redirect_link=myapp%3A%2F%2F%2Fevents%3FredirectRoute%3DonSignAndSendTransaction, so i believe it is encoded properly.
Or are you referring to this link: myapp:///events?redirectRoute=onSignAndSendTransaction&errorCode=-32603&errorMessage=Unexpected+error ?
This link is the one i got back from Phantom.
But i will download the application logs and check for the specific error and get back to you on this. Thanks

[Sotatek-JamesNguyen6]

@adamdelphantom it looks like the SignAndSendTransaction deeplink only works on mainnet! I'm able to see the Confirm transaction popup now! Thank you for your support