{
  "manageEntity": {
    "action": "Save",
    "entityId": "819732332",
    "entityType": "Track",
    "nonce": "0x9f7a11195cf35afc494b910788b192b15ae9995cbf56cf931053e848e23ca339",
    "signature": "0x5169c03b10046f17adbf735930d90c3c1a59a9ac04f0322bc1c8e71f155ea0aa711b8b785aa7640a00e301a32b131b8a87d08cadca1e110d88e9c99cd507439d1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}