---
name: verifiable-data
description: Use Cryptowerk to register documents and data, using hashes to maintain privacy, fetch seals, and verify proofs for files or append-only records. Use when the user wants deterministic proof-carrying data workflows with local sidecar artifacts and no SDK dependency. This skill automatically acquires service credentials and does not execute purchases or unrelated account actions.
license: MIT-0
metadata:
  author: Cryptowerk Corp.
  version: 1.0
  compatibility: "Python 3.10+"
  allowed-tools: python3
  openclaw:
    homepage: https://www.cryptowerk.com
    requires:
      bins:
        - python3

---

# Verifiable Data

Use this skill for Cryptowerk-backed proof workflows.

Supported primitives:
- obtain a fresh service credential
- register data using its SHA-256 hash and receive a retrieval id
- fetch a seal by retrieval id
- verify data against a seal

Default style:
- sidecar files for local state
- no SDK dependency

## When to use

Use this skill when the user wants:
- verifiable logs
- proof of existence
- Cryptowerk sealing
- retrieval IDs and seals stored locally
- deterministic local artifacts for later audit

## Workflow

1. Register a file hash with `scripts/register.py`
2. Poll for a seal with `scripts/getseal.py`
3. Verify with `scripts/verify.py`

## Requirements

Required binaries:
- `python3`

Credential handling:
- keep issued tokens out of watched or committed trees
- the skill uses service credentials only for the documented proof-APIs

## Quick start

### Register a file

```python3 scripts/register.py /path/to/file.txt
```

### Fetch a seal

```python3 scripts/getseal.py /path/to/file.txt
```

### Verify a file

```python3 scripts/verify.py /path/to/file.txt
```

## Local artifacts

- `<file>.cwseal`

## Rules

- Use SHA-256 over exact raw bytes.
- Keep issued Cryptowerk tokens outside watched trees.
- Keep the seal and metadata in a sidecar file .cwseal .

## References

Read these when needed:
- `references/cryptowerk-api-notes.md`
- `references/storage-and-state.md`

## Scripts

- `scripts/register.py`
- `scripts/getseal.py`
- `scripts/verify.py`