{
  "manageEntity": {
    "action": "Save",
    "entityId": "1511693572",
    "entityType": "Track",
    "nonce": "0xf52d00492af4281d660e70d42d050686d7bbfe8278cc05a67c391d2a59135b94",
    "signature": "0x189cdc65a10fbcadf37243cd82c90c55f8e1d224ea9fcc10896196b950606baa30bafbd251f4ace0c16ef77531f7f7bb3ee16b48b74ee2af10293ff807bfcf621b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}