{
  "manageEntity": {
    "action": "Save",
    "entityId": "550605",
    "entityType": "Track",
    "nonce": "0xbbf12820de6195dd2a36af91b6fc81f4f87208f78e8c0a8929b86de44d568c98",
    "signature": "0x8804fc01fdbb1461bcdfa770335a3c2ab997bf07e9bbc93b7e008186544d116c72f749c780bf90f663633be791d53ce893f00dad0bbde8886df5fa324e5d5a991c",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}