{
  "manageEntity": {
    "action": "Save",
    "entityId": "325602458",
    "entityType": "Track",
    "nonce": "0x5a2439243686eba69384d6a9e1b0dc2ec3dfe7305cf05b814b5427d58aea6e52",
    "signature": "0xea021e0f72ef95f7c927ea8d1f1fb00d7690d4c8b7a66d4fd005cc5cb203bd5b4ce0a583834c2cd4996540f495e2d86c6b17eaf52b97facc6ae5a843697a3b691b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}