{
  "manageEntity": {
    "action": "Save",
    "entityId": "1399595803",
    "entityType": "Track",
    "nonce": "0x754c50510bc66fb086385cdf44ba376b195fa8119d66a5ae68e350be9e6d4d0d",
    "signature": "0x3d5472e70c9ca5b85e31881938359d3ea537bd558e77d740c77ebdc8a2ebcac8310b25540357b92659af94bcd843d9f1407e068eef3d1457f8d17db9cda46d9a1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}