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> but once a piece of data gets confirmed... it can never be changed or removed from the blockchain. But it can, in the exact same manner as described in this
by tylerhou 5y ago
> but once a piece of data gets confirmed... it can never be changed or removed from the blockchain.
But it can, in the exact same manner as described in this article: have an 51% attacker build up a long chain and hide it from the world; then publish it.
PoW is vulnerable to exactly the same type of attack described in this article. In order to build a longer chain with non-negligible probability, you need to stake at least 51% of the pool.
- disiplus 5y agono the difference is, to build a side chain you have to produce the work, work that has a real cost and takes time, remember in POW the chain with most work wins.