docs: add OpenTTT to callbacks integrations - #5257
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Naomi Pentrel (npentrel) merged 1 commit intoAug 4, 2026
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langchain-openttt (PyPI, published) adds a TTTPSTimestampCallbackHandler that attaches a cryptographic Proof-of-Time timestamp to LLM generations via on_llm_end, for tamper-evident audit-trail timestamping.
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Thanks for opening a docs PR, axcpeter! When it's ready for review, please add the relevant reviewers:
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Naomi Pentrel (npentrel)
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Aug 4, 2026
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Adds
langchain-openttt(PyPI: https://pypi.org/project/langchain-openttt/0.2.0/) to the callbacks integrations table.langchain-opentttprovidesTTTPSTimestampCallbackHandler, aBaseCallbackHandlerthat attaches a cryptographic Proof-of-Time timestamp (draft-helmprotocol-tttps, https://datatracker.ietf.org/doc/draft-helmprotocol-tttps/) to each LLM generation viaon_llm_end, for tamper-evident audit-trail timestamping. Fail-open by design: any timestamping failure degrades to astatus: degradedreceipt rather than raising, so it never breaks the caller's LLM pipeline.Contributed by the OpenTTT / Helm-Protocol team (maintainers of
langchain-openttt).Following the process at https://docs.langchain.com/oss/python/contributing/integrations-langchain — this is a docs-only PR adding a row to
integration_external_docs.yamlper that guide, since new integrations are published as independent PyPI packages rather than core PRs.