{
  "manageEntity": {
    "action": "Save",
    "entityId": "1440975812",
    "entityType": "Track",
    "nonce": "0xcf4387a44e2e156941234f28877f78a5b5c50b60e1f213907dba35ee785750c7",
    "signature": "0xd97842f516f8500c19e37470b81ad3b00533c5c32e2299f972c92270b7c0a2ba40af75b2120dea28847364bbe3f771aa483108b32777b776b55f804a4a68469c1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}