Low-latency AT Protocol interaction indexer.
Update README.md
Aly Raffauf
(Jul 7, 2026, 10:44 AM EDT)
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Asterism connects directly to the relay Firehose (`com.atproto.sync.subscribeRepos`), decodes each repo commit's CAR-framed CBOR blocks itself, and recursively walks each record for link references (strong refs, AT-URIs, DIDs, URLs). Links are stored keyed by target, source collection, and field path. It can optionally backfill existing repos for your configured collections on startup so the index is useful immediately.
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This matters for three reasons:
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**Sovereignty** — No middlemen. Asterism reads straight from the relay Firehose, and doesn't rely on secondary processors like Jetstream.
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**Latency** — Fewer hops also means fresher data faster. Asterism reduces Constellation's Relay → Jetstream → Constellation to a single hop, Relay -> Asterism.
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**Verifiability** — Firehose commits carry signed MST proofs; Jetstream strips them and re-serializes as plain JSON. Asterism verifies each record against its repo's signed commit instead of trusting an upstream re-encoding.
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Because Asterism connects directly to the relay Firehose, and doesn't rely on secondary processors like the Jetstream, it can achieve very low latencies for near-realtime backlinks while preserving MST integrity checks.
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```
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Relay ──► Jetstream ──► Constellation (preprocessed events)
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Relay ──► Asterism (raw commits, filter locally)
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Relay ──► Jetstream ──► Constellation ──► Apps
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Relay ──► Asterism ──► Apps
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```
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## Quick start