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Blockchains are often forced to make trade-offs that prevent them from achieving all 3 aspects:

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Decentralized:

• Creating a blockchain system that does not rely on a central point of control

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Scalable:

• the ability for a blockchain system to handle an increasingly growing amount of transactions

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Secure:

• the ability of the blockchain system to operate as expected, defend itself from attacks, bugs, and other unforeseen issues

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Sources

• https://medium.com/certik/the-blockchain-trilemma-decentralized-scalable-and-secure-e9d8c41a87b3