{
  "manageEntity": {
    "action": "Save",
    "entityId": "386469",
    "entityType": "Track",
    "nonce": "0x0f9c609ea91e2c5fecefe8cc429e19e1ed44e012903a6673c081de425857d607",
    "signature": "0xec7d65318d8e98b46f6cdb2f52ad85369722dc05e9753134a1356b61c27c370864e1f3e8ad0962748aa944f35cb062e20df0aac5ad241daf2bc496473d0c1a5d1c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}