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Why is blockchain is considered as the safest one?Why can’t it be hacked??

Addition to a public blockchain's decentralized and distributed nature, a cryptographic process known as hashing algorithm keeps blockchains secure from hacks. Hashing algorithms scramble data into randomized alpha-numeric text of a fixed length call

If I’m not wrong even whatsapp algorithm converts our every text into binary and only be Visible to the sender and the receiver but it can be hacked right??

Gotcha. Even i got curious from your question and looked it up, it says: Hashing and encryption are both fundamental computer system operations that change raw data into a different format. However, they differ in the following ways: Purpose Hashing

What if whatsapp Uses a technique like hashing Which is irreversible then no one can hack it right??

I dont think so, this is actually a genuine and genius usecase 😂😂🏆