Claude runs your agents.
DarkMatter proves what they did.

# In your shell or .env
export ANTHROPIC_BASE_URL=https://darkmatterhub.ai/ext/claude
# The SDK sends this as Authorization: Bearer, which is how the
# proxy receives your DarkMatter key.
export ANTHROPIC_AUTH_TOKEN=dmp_your_proxy_key

# Your real Anthropic key, which DarkMatter forwards and never stores.
# Either send it per request as the X-DM-Forward-Key header, or save
# it once under Settings, Claude Recording.

import anthropic

client = anthropic.Anthropic()  # picks up ANTHROPIC_BASE_URL automatically

# Managed Agents session, recorded automatically
session = client.beta.sessions.create(
    agent_id="agent_...",
    environment_id="env_..."
)

# Every event becomes a verifiable DarkMatter record
for event in client.beta.sessions.stream(session.id, events=[...]):
    process(event)

# → Each step: hash-linked, timestamped, verifiable offline

# Standalone offline verification
python verify_darkmatter_chain.py proof_bundle.json

  bundle    context-passport-bundle
  records   4

  VERIFIED. Every payload hashes to the value recorded with it, and
  each record names the one before it.

  Note: this proves the records you have were not altered. It cannot
  prove none were withheld.