{
  "manageEntity": {
    "action": "Save",
    "entityId": "548310939",
    "entityType": "Track",
    "nonce": "0xd75f2967bb71cf14bf4a55490e208b2bc6374f8119498df367739acca804a754",
    "signature": "0xc67509958aa572716419e8cb8f0a2ae59da93e6caa1ea46ebdf8f5c1bb7821787165dd02b10491091b56ec47929fc4d5008b247bea1bc31a535105c23656e12c1c",
    "signer": "0xF7F56DF4D8a2Ae2BF9Ca645DC684f84c37BbDaFe",
    "userId": "116272245"
  }
}