{
  "manageEntity": {
    "action": "Save",
    "entityId": "545776",
    "entityType": "Track",
    "nonce": "0x4b6951560003ed8ce556965ed44ac94124db8bbce74f5fe68f236e600d6a011d",
    "signature": "0x4ae9528525004f9e1215ab6da5526ca3a50ab8020b4fa795eccd030f6a67ff7c0ed54b19ca20e50cfe8e182ba1ae59a09813dd177d0def2ce04995190104a33c1b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}