{
  "manageEntity": {
    "action": "Save",
    "entityId": "754764039",
    "entityType": "Track",
    "nonce": "0xe0d0f28e2b55598cb65f3e75cccebdfc6d62887ee72281e83fa1adfb907ddcdb",
    "signature": "0x3cc50b4461cb2a4e78e908b6a46c61ecba33d10e607b67f607106d551da70a2f08c9cf32ba27c08ba89b87feb3ccb331e1f228690899463ad10aa6fb072f55e51b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}