verifiable-credentials SKILL.md skillA
verifiable-credentials from sparq-org/sparq is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add sparq-org/sparq/verifiable-credentials@v0.1.0Pins v0.1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- sparq-org/sparq
- Path
skills/verifiable-credentials/SKILL.md- Versions recorded
- 5
- Latest version
- v0.1.0, committed Oct 9, 2026
- First version recorded
- Jun 23, 2026
- Size
- 10,896 bytes
- Repository stars
- 13
- License
- MIT
Verify and sign RDF graphs with W3C Data Integrity (eddsa-rdfc-2022 — standard Ed25519 over RDFC-1.0 + SHA-256) and resolve did:key/did:web to a verification key, with the opt-in sparq-vc crate. Use when you trust the SIGNER's key but need tamper-evidence / non-repudiation over an RDF answer (audit trails, data marketplaces, journalistic provenance, agent-to-agent exchange) — the standards-interop, vetted-crypto complement to the in-circuit ZK estate (sparq-zk). Covers sign/verify…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# sparq verifiable-credentials (Data Integrity) **`sparq-vc`** implements the W3C [Data Integrity](https://www.w3.org/TR/vc-data-integrity/) [`eddsa-rdfc-2022`](https://www.w3.org/TR/vc-di-eddsa/) cryptosuite: **standard Ed25519** (RFC 8032) signatures over the [RDFC-1.0](https://www.w3.org/TR/rdf-canon/) canonical form sparq already has (`sparq-canon`), with `did:key`/`did:web` resolution. This is the **trust-the-signer** model — the ~90% case where the consumer trusts the signing key but needs **tamper-evidence and non-repudiation**. It is the **standards-interoperable, vetted-crypto** complement to the ZK estate (`sparq-zk`), whose Schnorr-over-Baby-JubJub signatures are deliberately non-interoperable. > **Honest boundary (load-bearing).** `eddsa-rdfc-2022` is **authenticity + integrity + > non-repudiation only** — **NOT** confidentiality, **NOT** zero-knowledge, **NOT** > selective disclosure. It proves *who signed* and *that nothing changed*, and reveals > the full signed content to the verifier. This surface makes **no privacy claim**. > Unlinkable / selective-disclosure presentation is the ZK estate's job (or a later …
Read the whole file at its exact version.
How to install
mdr add sparq-org/sparq/verifiable-credentials@sha256:42c9d4123eb9b97dThe line at the top of this page pins the label v0.1.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_exrwprh2j2hgghde)
5 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Jun 23, 2026 and Oct 9, 2026, about one every 27 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v0.1.0 latest | 2026-10-09 | f0b870d | 10,896 B | A | view · diff |
| v0.1.0 | 2026-10-06 | 54c8fe7 | 10,907 B | A | view · diff |
| v0.1.0 | 2026-10-05 | bfe8514 | 8,191 B | A | view · diff |
| v0.1.0 | 2026-09-03 | 1a63aa7 | 7,372 B | A | view · diff |
| v0.1.0 | 2026-06-23 | b5f1554 | 7,368 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (10896 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
sparq-org/sparq · 13 stars · license MIT · pushed 2026-11-05 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_exrwprh2j2hgghde GET https://markdownregistry.com/api/v1/resolve?ref=sparq-org/sparq/verifiable-credentials GET https://markdownregistry.com/api/v1/blob/42c9d4123eb9b97dc7bba6af9993af458ef52141c38fe1bc45fddf18b5c16861
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.