{
  "manageEntity": {
    "action": "Save",
    "entityId": "1440952569",
    "entityType": "Track",
    "nonce": "0x8fc77b972b71d3132df58615bf259bb8b67dabaa1ecae52a8303da45934b5a67",
    "signature": "0x118c726e61ae7aa72904b94144429b314c1eb5108638d4a7381bad4e2f6feff73e4f35a6458c5c18e5e1f293dedd3f67ace75fb2f26fd114aa18b522198141c21b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}