Most importantly is that whitepaper gave the idea of the transactions with no financial parties involved in the operation and with a clear network so that the fact of transaction can be seen. The main features of BTC as a cryptocurrency are:
Inability to reverse transaction:
No one can stop one person from sending a transaction to another person and/or company. Not the person that made the transaction, not the person that received it, not the government of your country. It might be a bit risky in some terms, yet it allows us to secure transactions at some point.
Being global and fast:
This aspect speaks for itself: transactions can be done in a matter of seconds around the entire world and are verified in terms of minutes, which is very convenient.
No real-world identity needed:
As previously mentioned, the government cannot stop a person from transaction, therefore there’s no need in any real-life information and/or real-life identity. Bitcoins are received on address — a random chain of letters and numbers about 30 characters. That makes it impossible to connect real-life identity and the address with an account or a transaction. However, it doesn’t mean that Bitcoin is anonymous. There’s still a need to protect one’s identity and it still requires a pseudonym.
Security:
Bitcoins are locked in a cryptography system with public keys. The transactions can be done with a private key — a piece of data that allows to spend BTC and works like an online signature. It proofs that the owner of the wallet is committing transactions. Such a private key allows to exclude any changes in the transaction itself, making it irreversible, as has been said in the first point. Both public and private keys are a long string of letters and numbers that have been mathematically encrypted with an algorithm. There’s no way someone can guess a private key for example.
https://swapzone.io/learn/bitcoin/