Or maybe a plug in that allows push or pull of relevant IDs to support indexing externally without needing to stream the entire blockchain.
Pushed to only registered IP addresses that are interested in those IDs. One way to implement this would be something like a p2p network. Although this comes with its own set of problems to solve (security, authentic inventory).
Right. If you are using RPC to a node now, you are trusting the node to be providing authentic data.
A plugin to retrieve just the data you need inherits the same same trust requirement but with a lot less overhead. This is even true if using your own node on your own hardware, since retrieving all the data over RPC (only to discard 90%+ of it) is itself pretty expensive.
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