{
  "manageEntity": {
    "action": "Save",
    "entityId": "745087813",
    "entityType": "Track",
    "nonce": "0x1769539387462d74b51d228fd746b8415bc70d391ebb2c32ce3c4d37da0de651",
    "signature": "0x425c4fd067d7ad63c3053e61dbd03e109f89c7d9f571bf09602324f90b1f69dd30bcbc8583f5eb69068fc217cfcea9f9e8106552799368db1080a7a837837bcd1b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}