{
  "manageEntity": {
    "action": "Save",
    "entityId": "221402",
    "entityType": "Track",
    "nonce": "0x51e13e78c04d5a2563ad42d078951d6f2988859b8f3bb3829519b5ea360dda94",
    "signature": "0xd8290336f9f487cbfce9b764b0954a8dc56320ddd2aef81b28e791685be7d38f0dac451e6d3a9b0b148a11e5a48ae49f0b8519d298b6640fcebd2a27c5d6ca181b",
    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
  }
}