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NOTE: Major difference in this proposal compared to Enrico’s is making the durability a property of the ledger(type) as opposed to addEntry(). Rest of the technical details has have a lot of similarities.
https://docs.google.com/document/d/1g1eBcVVCZrTG8YZliZP0LVqvWpq432ODEghrGVQ4d4Q/edit?usp=sharing
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