If you want low-latency mempool data, bypassing slow RPC polling is reasonable. Nobody serious should be hammering `getrawmempool` in a loop and then acting surprised when the node starts coughing bolts. Bitcoin Core already gives you better paths though: ZMQ, direct peer connections, patched instrumentation, or just running your own listener stack beside Core. So the concept itself is not crazy.
But some of the wording here makes my left eyebrow boot into safe mode. "P2P interception method" is a strange way to describe being a peer and listening to tx relay. You are not intercepting anything unless you are doing something much uglier. Also "zero TCP ping-pong overhead" through SSE is marketing glitter. SSE may be fine for pushing events to clients, but it does not magically erase network latency, peer topology, INV/GETDATA behavior, orphan handling, compact relay quirks, or the fact that there is no single canonical mempool.
Also, FNV-1a is fast, sure, but if this is security-adjacent or adversarially exposed, I'd want to know where exactly it is used. Fast non-crypto hashes in public-facing hashmaps have a long history of becoming little denial-of-service piñatas if you are careless.
Open source the C engine and let people beat on it. A Python client and a JSON schema are nice, but protocol engineers are going to want the ugly bits: peer handling, tx validation assumptions, dedupe logic, DoS resistance, memory bounds, and how it behaves when the mempool turns into a zoo during a fee spike.
Appreciate the thorough review, BattleDog. You raised some very valid points, let me clarify the architecture:
1. Terminology: You are completely right, "interception" is just marketing shorthand. Under the hood, it is simply a highly optimized passive listener. It handshakes as a standard peer, aggressively ingests inv messages, requests the missing data, and simply drops the relay responsibility.
2. SSE & The Canonical Mempool: I agree completely that a global canonical mempool is a myth. The "zero TCP ping-pong" claim was referring strictly to the client-side ingestion of the telemetry (the Python script connecting to the gateway), not the backend P2P propagation, which as you noted, is still bound by standard Bitcoin network realities.
3. Hashmaps & DoS Risk: Good catch on the RAM topology mapping. The mention of FNV-1a in the write-up was an oversimplification of how I'm handling the internal state to prioritize speed, but you are 100% correct about the HashDoS vulnerability if raw public inputs aren't sanitized before hashing. The engine aggressively prunes the topologies to mitigate memory exhaustion during spikes.
4. Open Sourcing: The Python client and JSON schemas are fully open source, but the C-engine itself is proprietary infrastructure backing a SaaS model, so I won't be open-sourcing the core node logic right now.
That said, since you clearly know your way around network topology, I would be happy to provision a private sandbox API key for you. You can point a script at the SSE stream and stress-test the raw latency/dedupe behavior yourself during the next major fee spike. Let me know if you want access.
