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Related question: does the cost of storing data on the blockchain on a byte basis decrease over time?

Meaning would such attacks (attaching CSAM content to a blockchain) become more feasible at lower cost in the future?

There's no fundamental link between the cost of storing data on a blockchain and time. However, practically, it does look like the most common blockchains have gotten more expensive over time: Bitcoin, Ethereum, even Dogecoin. However, you could imagine a blockchain that gets cheaper over time i.e. by issuing more coins or even stays the same.

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