{
  "manageEntity": {
    "action": "Save",
    "entityId": "57958854",
    "entityType": "Track",
    "nonce": "0x37bf94a7c54f79d1bb97c782ee5669d2d289ca05f631531603aed332ae23b36e",
    "signature": "0x3f7fb8280d188a72d5f2434011d5fe412359b9363baf4e7333f1c9d22e62aea61926d95526c6c6266b661a7490fa4af516af063c920adb27310fce57696ec2521c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}