{
  "manageEntity": {
    "action": "Save",
    "entityId": "520346",
    "entityType": "Track",
    "nonce": "0x0faa6617bc642b0eb26bf82977e38c87d60f699174469ca55df1af25fbcba829",
    "signature": "0x10fa7aae424f6a6417f10788807c479d516a163622cf38db3173bc786e8984e72cf8a03c3e3a71b9c0889708fb728b6f5a3bdb78607d5b180041c4f6c7de69131c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}