I like a lot this idea! Some comments/ideas:
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This initial investment, to incentivize an app to be picked up by validators, could be made by the DApp developer, the Cartesi Foundation, or random investors, right? It’s really cool to have this incentive mechanism be streamlined like that, allowing investors to be rewarded for funding successful apps!
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How does this relate to the Reader Node Marketplace proposal (Node Marketplace)? There are signallers there too, but over there instead of a bonding curve the idea was to reward signallers by giving them a share of query fees. So is this proposal here complementary, meaning that we would still use that one for readers, and this one for validators? In that case, do you envision the same node acting as both validator and reader, and participating in both mechanisms to get incentives from both?