{
  "manageEntity": {
    "action": "Save",
    "entityId": "1558166650",
    "entityType": "Track",
    "nonce": "0x3f8493a7db324b7c18e7c1a89f24123013df5c7d4d0c4e21c8aeb35ce09ff75b",
    "signature": "0xccf09eb6347dcea0d056f1f83a1e9dfbf488ea6e2d06fc4d2caa1b23081c729b07f9b00729ab8bc6b7e07d384a194a1451a1b42bc681b4e6fabcf573eb0ad25c1c",
    "signer": "0xdB791822A11f5aDc830669bdADa8121a4558D7A3",
    "userId": "347139808"
  }
}