{
  "manageEntity": {
    "action": "Save",
    "entityId": "437253665",
    "entityType": "Track",
    "nonce": "0xe8127f6c1b20731f7516306029d56fd95160c6b4ace7e89abbbc832f5722062f",
    "signature": "0x5013ecbba1582ac430f5f3c39dd0716e811928838e000a58666b953ebd6487a673ce661c926517389f96808a5269e1e8f9b75714a65291a1d19deb138602e2031b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}