These guys (they are a company) have a pen testing approach for blockchain. Apparently is it difficult to make transactions anonymous-in-source within a blockchain as any one transaction reveals a marker that allows a hacker to go fishing within the blockchain for comparable markers. In a Byzantine Agreement (in this space) there is a second round of acceptance, based on proof of work (POW), proof of stake, proof of trust, or proof of space. The blockchain security stuff comes with new challenges in short.
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