{
  "manageEntity": {
    "action": "Save",
    "entityId": "647011",
    "entityType": "Track",
    "nonce": "0xd111efbc6b89307870317ac1d13168beafe67bec3bd56b553d59f0fd4b2e4fb6",
    "signature": "0xb4e6d9daef67f8db070b2559215270bc4223f286174871eb25fd2445289dd1241582b89c7efbf98287135262c25f728250747f8ad04e7c30ccbe9b8cd72bf9ff1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}