My question is what else can I do with headers alone + nostr information? We can do OTS + onchain zap validation with headers only. But I don't think I can send without fee estimation, which needs mempool, etc..
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Star treatment
you can do a crude fee estimation if you know the blocksize and have the coinbase tx, and i dunno, look at the last 5 blocks, dont even know if you can ask for that type of data from peers directly but that that point you might as well ask mempool.space on the feerate and be done with it.
But in terms of additional use? Im using that header data for something else, depending on how hard i prompt you will know soon👀