Where is mana stored?

Could you please elaborate on the storage mechanism of Mana? I'm curious to know where exactly Mana is kept and how its security is ensured. Is it stored in a decentralized manner, or is there a central repository? Furthermore, what kind of technological infrastructure supports the storage of Mana, and how does it ensure the integrity and availability of the digital asset? Lastly, are there any specific measures taken to safeguard against potential hacks or thefts of Mana? Thank you for your clarification.