{
  "manageEntity": {
    "action": "Save",
    "entityId": "439358",
    "entityType": "Track",
    "nonce": "0x9e6471af3c49b062eea7d7742839f5393830923a81e68bcf5f9651e311b159d5",
    "signature": "0xa3bb984a912ecac5e40df8b38f03230cc75a94518a991c9afab46b7c5938147f18e4dcf45b4721b01be6c5ff2b4bbf4afb7223546ea3e0a5341a0224fddc00f81b",
    "signer": "0x27204C77Baa4a510c92A96A4ba3661CC53EE568E",
    "userId": "35918963"
  }
}