{
  "manageEntity": {
    "action": "Save",
    "entityId": "447021",
    "entityType": "Track",
    "nonce": "0x568e8eed60556888be87d594fe48bcbc58a479bc0bc52ee2197e804f09f7ac01",
    "signature": "0x83a2c1cfa0633f9b38c111f232ffb0eec2d0d1997f45571996b00ee4244907306232f74843c4dd1ae604e596cca055523883233de8d1ff1b34831c1e3844d1b31c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}