{
  "manageEntity": {
    "action": "Save",
    "entityId": "1474802873",
    "entityType": "Track",
    "nonce": "0xb0460c270b20f93bd7b91968eb9d8f10bf155d88c1af3240f62b1df781165f31",
    "signature": "0x7f7a193a6726c88dcca41e40851d9b881f8c3762dbc816cf6289ef388b0230bb2583936d85e63fc83816fc4cd73bdafab924b672f09b4c48a957d5ae729ec63a1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}