{
  "manageEntity": {
    "action": "Save",
    "entityId": "1750056809",
    "entityType": "Track",
    "nonce": "0x7f5e10475f4408878fb05cfb04bdd11b75a3e3b24ed909b425017dfdac9fd8df",
    "signature": "0x3f661debad0a1140d4526b93c1fcd6fdf25a398438bc1572e31ea0cc9920d0c1204ddb2c4ae6fac30a00792b17a96558e32431742c849ca90e49526b4da8c28e1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}