{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x73cf7c6748724ac0a522ff4c1347afb03da1f3d75c84fe610574e0d0575b6a81",
    "signature": "0x05c8fabe0e527872f081e88dc4bbe05ebfe9e9af6b139e15ee1fee5351e0780a6340545c4da2d37cc378a3b27f383bf4302591bca25dee88c8e1fc9140618ba41b",
    "signer": "0x1F6fD63727526a874dDfD265AD16C1F89B3fAFD6",
    "userId": "660209426"
  }
}