Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add j4flmao/agent-skills --skill blockchain-cryptographygit clone --depth 1 https://github.com/j4flmao/agent-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/j4flmao/agent-skills/blockchain-cryptography)<a href="https://agentmods.dev/skills/j4flmao/agent-skills/blockchain-cryptography"><img src="https://agentmods.dev/badge/skills/j4flmao/agent-skills/blockchain-cryptography/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/j4flmao/agent-skills/blockchain-cryptography"><img src="https://agentmods.dev/badge/skills/j4flmao/agent-skills/blockchain-cryptography.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00201 | $0.08325 |
| Opus 5 | $0.00101 | $0.04163 |
| Sonnet 5 | $0.00040 | $0.01665 |
| Haiku 4.5 | $0.00020 | $0.00833 |
Grade A, and why
blockchain-cryptography scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 8d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 641 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Blockchain Cryptography
Purpose
Guide the selection, implementation, and optimization of cryptographic primitives specific to blockchain systems. This skill enforces correct curve selection, signature scheme choice, and key management practices across all major blockchain protocols.
Agent Protocol
Trigger
"blockchain cryptography", "elliptic curve", "secp256k1", "BN254", "BLS", "Ed25519", "hash function blockchain", "Keccak-256", "SHA-256 blockchain", "Poseidon hash", "Merkle tree", "Merkle Patricia Trie", "Sparse Merkle Tree", "Verkle Trie", "ECDSA", "Schnorr signature", "BLS signature", "threshold signature", "FROST", "multi-sig", "aggregate signature", "zero-knowledge", "zk-SNARK", "zk-STARK", "Bulletproof", "circom", "Halo2", "BIP-32", "BIP-39", "BIP-44", "BIP-340", "PSBT", "BIP-174", "HD wallet", "key derivation", "cryptographic primitive", "signature scheme", "pairing-based cryptography", "post-quantum", "ecrecover", "EIP-712", "EIP-191", "RFC 6979", "KAT", "known-answer test", "nonce reuse", "signature malleability", "MuSig2", "threshold signing", "DKLs", "CGGMP", "aggregate signature", "hash-to-curve", "ICP", "Internet Computer"
Input Context
- Cryptographic operation (signing, verification, hashing, proof generation)
- Blockchain platform (Ethereum/Bitcoin/Solana/Cosmos)
- Security level requirement (128-bit / 192-bit / 256-bit)
- Performance constraints (verification throughput, gas budget)
- Key management model (single key, HD wallet, multi-sig, threshold)
- Threat model (passive/active, quantum-resistant needed?)
Output Artifact
Cryptographic architecture specification including:
- Selected primitives with curve/parameter justifications
- Implementation approach with library recommendations
- Security analysis with known attack vectors and mitigations
- Performance benchmarks and optimization strategies
Response Format
- Cryptographic primitive: curve/hash/scheme + security level + performance characteristics
- Blockchain usage: where and how this primitive is used in real blockchain networks
- Implementation details: algorithm specifics, edge cases, optimization techniques
- Security considerations: known attacks, parameter choices, implementation pitfalls
What ships with it
18 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- references/blockchain-cryptography-advanced.md 5.2 KB
- references/blockchain-cryptography-fundamentals.md 3.1 KB
- references/elliptic-curve-crypto.md 6.6 KB
- references/hash-functions.md 6.4 KB
- references/key-derivation-management.md 11 KB
- references/merkle-trees.md 7.3 KB
- references/pairing-based-cryptography.md 18 KB
- references/post-quantum-blockchain-crypto.md 19 KB
- references/reference_guide_1.md 207 KB
- references/reference_guide_2.md 207 KB
- references/reference_guide_3.md 207 KB
- references/reference_guide_4.md 207 KB
- references/reference_guide_5.md 207 KB
- references/reference_guide_6.md 207 KB
- references/reference_guide_7.md 207 KB
- references/reference_guide_8.md 207 KB
- references/signature-schemes.md 7.7 KB
- references/zero-knowledge-deep.md 7.7 KB
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 8d ago First seen · 641 lines · 201 tokens per session scan A 23ed5702a7be
blockchain-cryptography is a skill published in the GitHub repository j4flmao/agent-skills (23 stars, last pushed 5d ago), licensed MIT. It adds 201 tokens to every session and 8,325 once invoked, about $0.0010 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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