{
  "manageEntity": {
    "action": "Save",
    "entityId": "962499",
    "entityType": "Track",
    "nonce": "0x937d2f9e6b2801402cfdf8c5b72f491ea5ffbd81553ccd1db9afe5ab416d2de5",
    "signature": "0x2f571206002415b0847e212df35e2c67819ecebb65f96e2e4d9b0797d7c698ed0fd867eb3a97f41f39c7405824c5f5c1209d2d33123ed145de20ec4a621ca70b1b",
    "signer": "0x6c61C53D90aa27cEe6e7265098fF6de086a3dBfc",
    "userId": "391472151"
  }
}