http://whirtorrgetftvz4g466sjqkegtyi35bjl4bvotfkfossunf5my4x6ad.onion/blog/is-bitcoin-anonymous
On the contrary, Bitcoin has a publicly opened ledger called blockchain, where every single transaction that happened on-chain ever since the inception of Bitcoin in 2009 is recorded. With blockchain, all the transactions occurring will forever be written in an immutable ledger and thus, cannot be changed.