{
  "manageEntity": {
    "action": "Save",
    "entityId": "393975",
    "entityType": "Track",
    "nonce": "0x9b8866fd25dc62cf8423d2662386abd3c2c3b2e761408f3c338fabaf87710299",
    "signature": "0x107b593642674c2b40cbb867fd1b7ff0613106aac1146a86220a5072ff602c672a308b8bf8141cf9561a3179d28df214a231fda1512fef36401db11f761f357d1c",
    "signer": "0x7425EdbFdF528603A88c658f4cf8B1396a8a77F5",
    "userId": "406225571"
  }
}