Got it, you need proof-of-spacetime and proof-of-retrievability. Look at Filecoin. Or maybe Arweave which stores everything in a blockchain that isn't guaranteed to be kept by anyone.
These are the state-of-the-art solutions to the problem you're trying to solve.
Those are solutions ungirded by a blockchain - but perhaps there's insight around incentives there.
To be extra clear, I'm not looking to prove they will hold onto messages forever, just that they're incentivized to hold them and therefore will bias toward doing so.
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