langchain-ledgerproof 1.0.0

LangChain callback that auto-issues LPR Article 50 receipts for every LLM call.

langchain-ledgerproof

LangChain callback that auto-issues EU AI Act Article 50 receipts for every LLM call.

pip install langchain-ledgerproof

from langchain_anthropic import ChatAnthropic
from langchain_ledgerproof import LedgerProofCallbackHandler

callback = LedgerProofCallbackHandler(
    publisher_id="LEI:5493001KJTIIGC8Y1R12",
    deployer_country="DE",
    deployer_name="Acme Corp",
)

llm = ChatAnthropic(model="claude-sonnet-4-6", callbacks=[callback])
response = llm.invoke("Write a haiku about Bitcoin.")
# Receipt issued automatically. Your code is now Article 50 compliant.

Works with any LangChain LLM (Chat or Completion). Each invocation in a chain or agent gets its own receipt. Background issuance — your chain isn't blocked.

Configuration

Reads LEDGERPROOF_API_KEY from the environment if not passed.

See the main ledgerproof package for the full Article 50 protocol.

License

Apache-2.0.