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The most surprising thing about Bitcoin might be the security of its network, I believe. A lot of people might have doubted its security in the initial few years, and they must have thought that it will be attacked and disturbed in the future, but that never happened. Other than some network congestions from time to time, we have never seen anything too hectic or worrisome about Bitcoin's network and blockchain, which is great.
The network congestion is common, it happens because of the soaring transactions that occur in the On-chain network so that there are many transactions that are still unconfirmed.
A few days ago I was also affected by network congestion and after that it was normal.
The security of the Bitcoin network is now completely watchable, because the Bitcoin developer community is so solid around the world
that every code is closely monitored due to the Open Source Code that developers can monitor around the world.
In the beginning of the emergence of Bitcoin there were 2 attacks that were quite famous and had an impact on Bitcoin, such as attacks.
1. Bug 184 Billion Bitcoin (Value Overflow Incident - 2010)https://www.binance.com/en/square/post/249493437691462 Bug Inflation (CVE-2018-1714 - 2018)https://bitcoincore.org/en/2018/09/20/notice/You can read the details on the link I pinned.
The 2 attacks are indeed the most threatening, but after the Bitcoin Code is updated by the developer,
any attack is now no longer able to penetrate the network or manipulate the Bitcoin network.
Some just because of the surge in transactions due to Bitcoin Layer 2 like transactions in the ordinal network etc.
Now the main security risk lies only in its users, because every user or those who have Bitcoin assets must be more careful not to lose their Bitcoin access on personal wallets, on the exchange or elsewhere that is the storage of Bitcoin.