{
  "manageEntity": {
    "action": "Save",
    "entityId": "648616916",
    "entityType": "Track",
    "nonce": "1786556050118999125",
    "signature": "0x292053a03c5bbdefe4e4e177007e925ea935713ccda909060b484c3e14bbe43c5735c8838d8fa5d50d5c62c0e897d3864ce1a28f77129c40304a026eb7a5d1cc1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}