There is no proof we can show or see, but top Bitcoin miners hold huge hash power and can do a lot of harm.
Since the Bitcoin mining node may be run by anyone who afford to spend money on the required computational infrastructure development for hash power nodes.
Although we assume that by definition of Bitcoin white paper, the Bitcoin transactions are impossible to be re-written (compromised), the truth may change with the huge hash power in the hands of the top Bitcoin miners!
Last thought, but not the final words!
Cryptocurrency is a decentralized fintech tool with tremendous possibilities.
The decentralized trait is the most likable feature of cryptocurrencies.
However, the top cryptocurrency miners hold huge hash power and can create a lot of problems, including quasi-centralized control over the network!
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