{
  "manageEntity": {
    "action": "Save",
    "entityId": "1416560455",
    "entityType": "Track",
    "nonce": "0xc7433fc2e74f147f4231db54da4d893c1028ac2482df4fc98316385d61d95dd8",
    "signature": "0xfd9fc2e51ab0cfe0c3fe9f95cf1586300468e83806fd1cfd067bd395393605642fa12ae45b670aa7ad1ddeec48ac7f5393a7db42f2d904fbf14664c9b83666921c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}