{
  "manageEntity": {
    "action": "Save",
    "entityId": "674172868",
    "entityType": "Track",
    "nonce": "0x8203b405e39ce525d263dff54d954664bae9cee0f6a43b448ec31ab76c98fa18",
    "signature": "0x70caa61ecf40fc2101134972d8f1147e775d030fffa4772ec9b0b24d9835334b3ff9f78a78f4cab95d2742e64698c0381d40b80f1158f6a499de9d74cd2509fe1b",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}