for blockchains to really work for IoT, you have to get rid of the linear chain — you have to let multiple people add transactions at the same time. Only then can you process thousands or millions of transactions per second. In other words, to make a blockchain work for IoT, you have to get rid of the blockchain. The tangle The started IOTA took on this challenge and created an alternative to the blockchain that was optimized for IoT. This alternative, known as the tangle, lets many people add transactions at once. Instead of a single linear chain made of blocks, the tangle connects a bunch of
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