sparq-org/sparq · .claude/skills/verifiable-credentials-zk/SKILL.md

verifiable-credentials-zk skillA

verifiable-credentials-zk is agent-read markdown (skill) from sparq-org/sparq: Patterns for handling W3C Verifiable Credentials inside a zero-knowledge pipeline — signature scheme trade-offs (BBS+ vs SD-JWT-VC vs EdDSA), commitment schemes (Pedersen, Poseidon), encoding of credential graphs to circuit-friendly representations, domain-separation discipline, and the public-input contract between the credential layer and the Noir circuit. Use when choosing crypto primitives, drafting the assumptions section, or pinning the verifier interface..

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add sparq-org/sparq/verifiable-credentials-zk@git:20260612.13b231c
Exact content
mdr add sparq-org/sparq/verifiable-credentials-zk@sha256:8073f98f6221722e

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_eu5pkw3iionoewjg.svg)](https://markdownregistry.com/a/art_eu5pkw3iionoewjg)

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Versions

versioncommittedcommitsizeaudit
git:20260612.13b231c latest2026-06-12 13b231c 4,628 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (4628 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

GitHub

sparq-org/sparq · 12 stars · license MIT · pushed 2026-09-14 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_eu5pkw3iionoewjg
GET https://markdownregistry.com/api/v1/resolve?ref=sparq-org/sparq/verifiable-credentials-zk
GET https://markdownregistry.com/api/v1/blob/8073f98f6221722eb0302f100ade9412dadbea50d55cb02f9b4d042f3c65d24d

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.