{
  "manageEntity": {
    "action": "Save",
    "entityId": "1618371886",
    "entityType": "Track",
    "nonce": "0x4ad6babdb31298e633cb98da1d287fea59ff5af6c46f23a5f089aa317439f724",
    "signature": "0x8e0f21f1275f1758820ef0e7d88d30d6a57fc947d87be42b9f6b619ffc78683164ae9e22af0edb7837a2100bb216f27d507f25d69cc8fe759c803e4303fe38011b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}