{
  "manageEntity": {
    "action": "Save",
    "entityId": "1949628954",
    "entityType": "Track",
    "nonce": "0x31c52b50c2a3255fb7a884f7b4776c0f6dd96cdb45b89328539da97470e42c94",
    "signature": "0xd90829bfb0eea555a57590621b855ed419b9ee5ef11bf26007dad1867d6c9c54194adb684e476e5c058c5eed492fe8db5df75c512ce817ff0d42344691d3f4421c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}