Replying to Avatar Super Testnet

I want to build a web wallet that uses Compact Block Filters

To do it, I think I need a reliable way to get data from bitcoin nodes in a web context, particularly (1) block headers (2) compact block filters (3) blocks themselves

Has anyone done any research into this? I found at least one electrum server that exposes its p2p interface via websockets, but I don't know if any bitcoin nodes do that. I thought about getting block headers from electrum servers and then downloading blocks from services like mempool_space and blockstream_info, but I suspect their rate limits would stop me from downloading more than ~100 blocks, and that still leaves me with the problem of finding someone that serves compact block filters in a web-friendly way.

What to do? Has anyone thought about running websockify on top of a bitcoin node to expose its p2p interface to the web? Maybe if a few nodes did that, a directory of web-friendly bitcoin nodes could be created, and web-SPV wallets could download blocks and block filters from them. Is that a good idea? Seeking feedback 🙂
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szarka 2mo ago 💬 1

Seems like at least some of this should be doable by querying the API on mempool-space instances? (Not just the one at mempool.space.) And there are a lot of those, though I'm not sure they're listed anywhere.

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Super Testnet 2mo ago

All of the ones I've tried to use on the web regularly fail to deliver content because of a CORS restriction. I think most people who set those up want the "visual" block explorer in the browser but don't care about letting other people "programmatically" access that data from a browser. Even mempool.space and blockstream.info throw cors errors if a web page queries their api endpoints via the `fetch` method, for example