This is what I find most disturbing:
"The major difference that is worth mentioning (apart from the DAG vs. Blockchain) is how IOTA achieves consensus and how transactions are made. As mentioned previously, there are no miners. What this means is that each participant in the network that wants to make a transaction has to actively participate in the consensus of the network by approving 2 past transactions. " - https://iota.readme.io/docs/what-is-iota
And referencing their whitepaper:
"In fact, it can be shown that the strategy of one large double-spending transaction
increases the attacker’s chances of being successful. In the “ideal” situation of this
mathematical model, this attack always succeeds."
- https://iota.org/IOTA_Whitepaper.pdf (page 16)

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