{
  "manageEntity": {
    "action": "Save",
    "entityId": "821838933",
    "entityType": "Track",
    "nonce": "0x3460222e2fa42eda0866a7b3b0aa6d09ad78c72cf4e21ae6743f509ff6b23e16",
    "signature": "0x36d032685c7787a66add8b2f6599e30b52ce03b92c9d7a027cf56f4b516b17a20bc681810a8df61f87a98d7c9b9a60f02799061fd8e2125ca941038b10d30b061b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}