{
  "manageEntity": {
    "action": "Save",
    "entityId": "21420016",
    "entityType": "Track",
    "nonce": "0xa24fc0bcf408d2b53e1297f7c36db82272d2a7a8105fc27f0235eb213663ce24",
    "signature": "0x184cb3761db106ba46c1cc6a47dfc040acc089c898d1487fed814acf6dd4c98d031df69788a3c1359198fa4b61a4ebf84873d5b6fd9ca4131196d28a5d6678a31b",
    "signer": "0x204E506f1D5498d2CABD41d2fc7a3078d5792835",
    "userId": "768479471"
  }
}