{
  "manageEntity": {
    "action": "Save",
    "entityId": "1939730431",
    "entityType": "Track",
    "nonce": "0x03b2786f4bf710494b9e7e074e8c10f11b611fd88c385ea821603bfd22043d31",
    "signature": "0x8f5a9785ee14fd83210d823878d9c684a9899e78720ce4ceb6da1e44ffceb7a2147a5da63494fa627df215c6080d69bfcea7c752b68a7ceafb5f794f7ca940db1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}