{
  "manageEntity": {
    "action": "Save",
    "entityId": "306664822",
    "entityType": "Track",
    "nonce": "0xdbcfe2b1819d7bfea5377a877a164da24b0c565e5e844b1399571f8e700d747b",
    "signature": "0xba416b890a6f9f317900e8327851e3544c3501135ce8b1100001f40859beded245ddb85adf15ab30f063dbc73ad08d760695f499c2b68f59c56b32ecb90b21ef1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}