{
  "manageEntity": {
    "action": "Save",
    "entityId": "147008792",
    "entityType": "Track",
    "nonce": "0x66e72eefff38b773276dc6333b3c6a61d03bbe3e0dc7cab26ddcf6bc8fcb8937",
    "signature": "0xc4ab96899bfa9b1125804d3f16981d46ca0d112864444d640a9ff01ca1301cf13bd66df1abc084e5bdcdea160cfe720039635bcd998238f45d9b7b0755abff2f1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}