{
  "manageEntity": {
    "action": "Save",
    "entityId": "747942",
    "entityType": "Track",
    "nonce": "0xee37b0867cd7edc6860710a956363b6b52bcfbf6fbb3a8e65f36d35de3e4ef54",
    "signature": "0x75736dca6ecfbb75f4ac717627eb802310a271185a99f5154b056df8b4e018d617e4fdad4b86b0e625acdd27aecc90020641a7f3b39328f39e2560f9912623ef1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}