{
  "manageEntity": {
    "action": "Save",
    "entityId": "55598518",
    "entityType": "Track",
    "nonce": "0x8d9a4f09d4dec658c839a85ab9a85563406e817b37a05b7e9341b45d8aaec4b9",
    "signature": "0x40df665926f77c14d8a1c4947e78e777b007bdf67e7261fde08e4fcbf84182270fca13f6785001a866bf4a0f41c97af443fa9eceb15e6b14650b2f42cacd6b7d1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}