hnji bhai bitcoin or other cryptocurrencies isme hi work krti hai or ye shard database ka matlab ye h ki isme sbka ledger ek jesa maintain hota hai alag alag distributed networks ya computer meh. is se transaction ko verify karna easy hota hai sath hi sath agar koi banda changes karta hai ledger meh beech meh toh woh valid nahi payega kuki woh kisi or distributed network se match nahi krega uska ledger isliy ye ek kafi secure ecosystem hai