{
  "manageEntity": {
    "action": "Save",
    "entityId": "1851231621",
    "entityType": "Track",
    "nonce": "0x3392f154b08960b222cf2a8ff5b1996b65be50fc5d87b52f369e44022fbb06ca",
    "signature": "0xeae3d6adb2f66ad3d5d5ac70f8b62e827b652596f0646ec3005befdb5ab43b5e004234ad0aef327bc3e5bedca4979c0cd5f3c33c4ca165164db78b37ed812b661b",
    "signer": "0x5D012C880480A2E1ab4345f6F374CFf73e040331",
    "userId": "10449019"
  }
}