{
  "manageEntity": {
    "action": "Save",
    "entityId": "649420580",
    "entityType": "Track",
    "nonce": "0x50ae944cfe9ba918b6585b6ee65624a5b1a929534c17e961fcc714c93e2b0a5f",
    "signature": "0xa346ee9c55c6f8fcf6bb4a6b5cf28b34ab2ad11893fab491bdab16202a97ae3c08fb1c005e80cc48db57e87f904d88837dcfeb58636e89b02b946f953b28322d1b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}