{
  "manageEntity": {
    "action": "Save",
    "entityId": "337110127",
    "entityType": "Track",
    "nonce": "0x90d19cbb15ecc8fdb4779047c0cc23423737c0816646f22bd1a88e17e1212523",
    "signature": "0x9b7019f344606e79339dee6c3950c2fbecb0404490315df7919003b01dd555b06840032503c87e8cef937ce66ab7026df18afe5502f577ee93313ee368189c971b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}