With reference to your query on Jinn and Shaytaan

With reference to your query <<< “is there any tangible proof for the existence of Jinns and Syaitan.” >>> it should be noted that the world of the jinn is the world of the unseen, and we do not know anything about it except that which Allaah Subhaanahu wa Ta`aala has told us in His Book, the Qur`aan or on the lips of His Messenger sall Allaahu`alayhi wa sallam. Based on this, we cannot say anything about them except that which has been narrated in the texts of Islam; anything other than that is hidden from us. Allaah Subhaanahu wa Ta`aala says (interpretation of the meaning):
“And follow not (O man, i.e., say not, or do not, or witness not) that of which you have no knowledge. Verily, the hearing, and the sight, and the heart of each of those ones will be questioned (by Allaah)” [al-Israa' 17:36]
It should also be noted that what information Allaah Subhaanahu wa Ta`aala has given us about the jinn and other creatures are for our benefit, and what He Ta`aala has concealed from us we do not need to know. If knowing that was essential for us, Allaah Subhaanahu wa Ta`aala would have told us. Hence we should not concern ourselves with such matters or look for tangible proof/mysteries of the jinn which can only be known through Revelation.
Below are some information pertaining to the matter of your query:
1. A brief summary about the Jinn and the Shaytaan, and their respective nature and characteristics, excerpted from the book`Aalim al-Jinn wa`l-Shayateen written by Dr.`Umar Sulaymaan al-Ashqar. If you wish to have more information, on this topic, you can purchase this book (in English) entitled “The World of the Jinn and Devils in the Light of the Qur`aan and Sunnah” published as Vol. 3 of the Islamic Creed Series by the International Islamic Publishing House, Riyadh , Saudi Arabia .
2. Some further information on the Shaytaan's existence from (Imaam al-Shawkaani' s tafseer) by Shaykh Muhammed Salih Al-Munajjid (Islam Q&A)
Allaah is the Best of protectors and we ask Allaah Subhaanahu wa Ta`aala to protect us and forgive us our sins and to bless us with beneficial knowledge and guide us to do righteous deeds. Aameen