{
  "manageEntity": {
    "action": "Save",
    "entityId": "489609",
    "entityType": "Track",
    "nonce": "0x8552ff49e5737c2cff0e9a486f23ea0ca5a2aae166e1f223f9e634313bb1d80d",
    "signature": "0x31ba940a5f52cbbeb2c4531525506bba0cc699448b9424d42d5842c44f719313707272ce4d036810eca0e8de11adc1448600bd52c9fa27c0dd047c1616e92e021b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}