Show HN: Mir – Portable participation history across platforms (open sandbox) (myinternetreputation.org)

  MIR (Memory Infrastructure Registry) lets platforms query a user's behavioral history across
   other platforms — without those platforms ever talking to each other.

  Every platform starts from zero. A seller with 500 five-star reviews on one marketplace is a
   complete unknown on another. MIR is the infrastructure layer that fixes this. Partners
  submit events via API, and when any partner resolves a user, they get aggregated signals
  from all participating platforms — with partner identities anonymized.

  The sandbox gives you an instant API key (magic link login). Two curl commands to try it:

  curl -X POST https://myinternetreputation.org/events \
    -H "Content-Type: application/json" \
    -H "x-api-key: YOUR_KEY" \
    -d '{"userExternalId": "user-123", "eventType": "transaction.completed"}'

  curl https://myinternetreputation.org/sandbox/resolve?userExternalId=user-123 \
    -H "x-api-key: YOUR_KEY"
  Use user-123 — when multiple people submit events for the same user, resolve returns history
   from all of them.

  Stack: Express, TypeScript, PostgreSQL, Redis. Sandbox is isolated from production,
  rate-capped at 5k events/day.

  Happy to answer questions about the architecture or trust model.