n8n Fold & Verify Challenge Ledger Stages (HTTP Webhooks)

Fold & Verify Challenge Ledger Stages with n8n (HTTP Webhooks)

Get a working n8n starter workflow that fetches a free sample event ledger via HTTP Request nodes and gives you a code placeholder to fold the ledger and verify stage answers before you submit—fast, practical, and built for n8n users.

What this workflow does

• Manually triggered: Start the workflow using an n8n manual trigger to begin the verification run.
• Fetches the sample ledger: Uses n8n HTTP Request nodes to retrieve a free sample event ledger payload from n8n’s marketing webhook endpoints.
• Folds and verifies: Passes the sample payload into a Code step where you implement the folding logic—filtering reversed events, sorting by sequence, applying events, and computing the required maximum value.
• Outputs comparison signals: Produces an event count plus the published sample answer so you can compare your computed result against the expected value.
• Stage endpoint ready: If you want to use the stage endpoints, replace YOUR_FORUM_USERNAME and MB-XXXX-XXXX with your challenge username and key, then fill in the stage answer values in the HTTP requests.

Use cases

• Preparing for CWC Challenge 00 by validating your ledger-stage logic against the provided sample before submitting.
• Debugging your “fold” algorithm using deterministic sample payloads retrieved through n8n HTTP Webhooks.
• Building a repeatable n8n verification workflow you can adapt to stage endpoints once your answers are ready.

Technical details

• Nodes used: Code, Sticky Note, HTTP Request, Manual Trigger
• Integration: HTTP Requests to n8n marketing webhook endpoints (and optional stage endpoints via provided username/key)
• Core logic location: Implement folding in the Code step (filter reversed events, sort by sequence, apply events, compute maximum value)

Category: n8n automation workflow • Built for automation engineers, SaaS operators, and n8n users who want a concrete, HTTP-based verification starter.