AttestoSpanProcessor (attesto.otel / @attesto/sdk) turns ended OTel spans
into commitment events: source_ref otel:{trace_id}:{span_id} so resending
a span is idempotent, only allowlisted attributes committed (as a
commitment, never raw — non-allowlisted values provably absent from
stored objects), fail-open with onError, strict opt-in. Both
implementations are structurally compatible with the SpanProcessor
interface, so neither SDK gains an opentelemetry dependency.
Building this surfaced two real gaps, fixed in all three languages:
- Emulators now deduplicate on (source_kind, source_ref) like real
ingestion (resend returns the existing receipt; anonymous empty refs
exempt) — previously a resend silently appended a duplicate event.
- P1.6 head tracking treated an exact idempotent replay (same seq_no AND
same event_hash as the stored head) as a fork; it is now a benign no-op,
while same-seq/different-hash remains AttestoForkDetected (regression
tests in Python, TypeScript-path via emulator test, and Go).
Suites: Python 109 passed, TypeScript 77 passed, Go 4/4 packages ok.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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