The digital signatures are 𝘱𝘳𝘰𝘰𝘧 that the sender in a transaction was the rightful owner of the coins being sent, but they don't 𝘥𝘦𝘵𝘦𝘳𝘮𝘪𝘯𝘦 the ownership. They're derived from the private key (which 𝘥𝘰𝘦𝘴 determine ownership) with a cryptographic function, so that it's easy to verify that the signature is correct, but practically impossible to use it to figure out the private key.

So they are visible to everyone. That way, anyone can fully audit the blockchain, but that does 𝘯𝘰𝘵 make your bitcoin vulnerable to theft or anything else.

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So learnmeabitcoin.com is wrong stating digital signatures determines ownership?

Learn Me a Bitcoin explains that digital signatures prove ownership, and are derived from the private key, but ownership is determined by knowledge of the private key: https://learnmeabitcoin.com/beginners/digital_signatures

Do you think the majority of the people will ever understand/use bitcoin specially those from 3rd world countries who are not so technically educated about these things?And can you give an example aside from the internet which is easier to use compared to bitcoin?

Yes, eventually everyone will need to understand Bitcoin, at least well enough to use it on a day-to-day basis. Not everyone understands the inner workings of cars, but anyone who wants to drive needs to learn to understand them well enough to use them. Similarly, anyone who wants to save the value of their labor in a way that can't be debased, and wants to transact in a way that can't be censored, will need to learn how to use Bitcoin, but won't need to comprehend all of its technicalities. As all fiat currencies inevitably fail, Bitcoin will become the only sensible option.

This is why Bitcoin adoption is growing rapidly in third world countries. Learning how to use Bitcoin, with only a rudimentary understanding of how it works, is all that the people in those countries need, since they already know 𝘸𝘩𝘺 they need it.

Can you reply in other languages apart from English?

So learnmeabitcoin.me is wrong about digital signatures determines ownership?

Learn Me a Bitcoin explains that digital signatures prove ownership, and are derived from the private key, but ownership is determined by knowledge of the private key: https://learnmeabitcoin.com/beginners/digital_signatures