---
license: other
language:
- en
tags:
- mainframe-modernization
- cobol
- cics
- static-analysis
- verification
- reproducibility
- legacy-modernization
pretty_name: AWS CardDemo No-Cost Modernization Proof
---

# AWS CardDemo No-Cost Modernization Proof

This repository publishes a reproducible proof bundle for a local modernization run against AWS CardDemo. It is intentionally **not** a claim of live COBOL/CICS all-path runtime equivalence.

Plainly: this is not a claim of live COBOL/CICS all-path runtime equivalence.

The practical claim is narrower and receipt-backed: we pushed the free/no-cost verification path as far as we reasonably could. The remaining validation requires a real or licensed-compatible legacy runtime for COBOL/CICS/VSAM/JCL execution.

In short: without paid/licensed legacy runtime access, this is as far as this proof can honestly go.

## Headline Result

- Reviewer posture: `strong_pre_runtime_confidence`
- Ready for pre-runtime review: `True`
- Current static/source-oracle parity: `B=50 / F=0 / gaps=0`
- A-grade live runtime parity: `A=0`
- A-grade promotion gate: `do_not_promote`
- A-grade live matches accepted: `0`
- A-grade live matches missing: `50`
- Paid runtime used: `False`
- Legacy runtime equivalence claimed: `False`

## Source Identity

- Upstream source repo: `https://github.com/aws-samples/aws-mainframe-modernization-carddemo.git`
- Upstream source commit: `59cc6c2fd7ebd7ef7925cad552a01a4b8b6e4d5e`
- Source files hashed in receipt: `204`
- Source hash digest: `0703f97553bde0f5bd170aa95ec8c771a975b397be7d9e8088ec6fbf31d333c2`

The upstream AWS CardDemo source tree is **not copied into this repository**. Clone it from the upstream project at the exact commit above when reproducing.

## Evidence Included

- `final_proof/FINAL_PROOF_README.md`: technical reviewer entry point.
- `final_proof/FINAL_RECEIPT_SUMMARY.json`: machine-readable receipt summary.
- `final_proof/NO_COST_CONFIDENCE_REPORT.json`: no-cost confidence evidence and methodology.
- `final_proof/A_GRADE_PROMOTION_REPORT.json`: strict A-grade gate and why it does not promote without live traces.
- `final_proof/STATIC_ORACLE_REPLAY_REPORT.json`: executable modern replay over static/source-derived oracles.
- `METHODOLOGY.md`: evidence method and proof boundaries.
- `REPRODUCIBILITY.md`: one-command local checks.
- `DUE_DILIGENCE.md`: quick reviewer checklist.
- `modern_code/`: modern Python/SQLite implementation snapshot and proof tooling.

## No-Cost Evidence Summary

- Capability count: `50`
- Static/source-oracle-ready capabilities: `50`
- Capability source references: `101`
- Golden traces: `34`
- Edge cases: `40`
- COBOL programs scanned: `44`
- CICS programs identified: `25`
- Free GnuCOBOL probe candidates: `17`

## The Unpaid Boundary

We cannot honestly push this to live runtime parity without access to a real or licensed-compatible legacy execution environment. That means one of:

- AWS Mainframe Modernization runtime access,
- Micro Focus / Enterprise Server-style runtime access,
- UniKix or equivalent runtime access,
- a real z/OS/CICS/VSAM/JCL endpoint,
- or another compatible environment capable of executing the original legacy paths.

Without that, the correct remaining statement is: the modernization is strongly supported by source-derived static oracles and executable modern replay, but final production-equivalence validation must happen on the legacy runtime owner’s environment.

## Repository Type

This is published as a Hugging Face dataset-style proof artifact, not a trained model and not a hosted runtime.

HF repo target used for staging: `cjc0013/aws-carddemo-no-cost-modernization-proof`