Agent skill

Implementing Log Integrity With Blockchain

by mukul975 in mukul975/Anthropic-Cybersecurity-Skills

Builds an append-only log integrity chain using SHA-256 hash chaining, where each entry incorporates the previous entry's hash so tampering invalidates all subsequent hashes; covers log ingestion…

Apache-2.0Auto-check passedSecurity

Install Implementing Log Integrity With Blockchain

skills CLI
$ npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-log-integrity-with-blockchain -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install mukul975/Anthropic-Cybersecurity-Skills implementing-log-integrity-with-blockchain --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/implementing-log-integrity-with-blockchain .claude/skills/implementing-log-integrity-with-blockchain && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
implementing-log-integrity-with-blockchain
GitHub stars
34k
Token cost
~611 tokens
SKILL.md length
172 words
Files
4 (incl. scripts, references)
Skills in repo
644
Repo updated
First seen
Licence
Apache-2.0

At a glance

Builds an append-only log integrity chain using SHA-256 hash chaining, where each entry incorporates the previous entry's hash so tampering invalidates all subsequent hashes; covers log ingestion…

  • Works in 6 steps: Install dependencies: pip install requests → Ingest log entries from syslog, JSON, or… → For each entry, compute SHA-256 hash of:… → …
  • Tamper-evident log storage for compliance
  • SKILL.md covers When to Use, Prerequisites, Instructions and Examples
  • Runs Python scripts from its folder; calls python and pip

What it does

Implementing Log Integrity With Blockchain is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Builds an append-only log integrity chain using SHA-256 hash chaining, where each entry incorporates the previous entry's hash so tampering invalidates all subsequent hashes; covers log ingestion (syslog/JSON/plain text), chain verification, pinpoint tamper detection, and checkpoint anchoring to external timestamping services. Use for tamper-evident log storage for compliance or forensics, or to verify whether log entries were altered.

Its SKILL.md is about 610 tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including scripts and reference files (for example `references/api-reference.md` and `scripts/agent.py`).

It sits in Security. The repository describes itself as: 817 structured cybersecurity skills for AI agents · Mapped to 6 frameworks: MITRE ATT&CK, NIST CSF 2.0, MITRE ATLAS, D3FEND, NIST AI RMF & MITRE F3 (Fight Fraud) · agentskills.io…. The licence is Apache-2.0.

When your agent uses it

  • Tamper-evident log storage for compliance
  • Verify whether log entries were altered

Example prompts

  • “Use the implementing-log-integrity-with-blockchain skill to build an append-only log integrity chain using SHA-256 hash chaining, where each entry…”
  • “/implementing-log-integrity-with-blockchain”

Requirements

  • Python 3

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  1. Install dependencies: pip install requests
  2. Ingest log entries from syslog, JSON, or plain text files.
  3. For each entry, compute SHA-256 hash of: previous_hash + timestamp + log_content.
  4. Store the chain as a JSON ledger with entry index, timestamp, content hash, previous hash, and chain hash.
  5. Verify chain integrity by recomputing all hashes and detecting breaks.
  6. Optionally anchor checkpoint hashes to an external timestamping service.

What it can do on your machine

Read from SKILL.md and the folder at commit 54a7988. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships 1 file in scripts/ (Python), which the agent can run.

    Shell commands in SKILL.md call:

    • python
    • pip

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use pip, which can reach the network depending on how they are called.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Implementing Log Integrity With Blockchain loads about 611 tokens when it runs, and up to ~985 if it reads all its reference files. Until then it costs about 121 tokens; SKILL.md has 172 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~121
When it runs · the whole SKILL.md, loaded when a task matches
~611
With references · SKILL.md plus every file in references/, read only if the agent opens them
~985

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.

SKILL.md

The full file from mukul975/Anthropic-Cybersecurity-Skills at commit 54a7988, republished under its Apache-2.0 licence (© mukul975). 172 words, ~611 tokens.

Download SKILL.mdSave it as .claude/skills/implementing-log-integrity-with-blockchain/SKILL.md (or your agent's skills folder). This skill also uses 3 other files; get the full folder from GitHub.
name
implementing-log-integrity-with-blockchain
description
Builds an append-only log integrity chain using SHA-256 hash chaining, where each entry incorporates the previous entry's hash so tampering invalidates all subsequent hashes; covers log ingestion (syslog/JSON/plain text), chain verification, pinpoint tamper detection, and checkpoint anchoring to external timestamping services. Use for tamper-evident log storage for compliance or forensics, or to verify whether log entries were altered.
domain
cybersecurity
subdomain
security-operations
tags
log-integrity, tamper-detection, hash-chaining, sha-256, audit-logging, security-operations
version
1.0
author
mahipal
license
Apache-2.0
nist_csf
DE.CM-01, RS.MA-01, GV.OV-01, DE.AE-02
mitre_attack
T1078, T1190, T1059

Implementing Log Integrity with Blockchain

When to Use

  • When deploying or configuring implementing log integrity with blockchain capabilities in your environment
  • When establishing security controls aligned to compliance requirements
  • When building or improving security architecture for this domain
  • When conducting security assessments that require this implementation

Prerequisites

  • Familiarity with security operations concepts and tools
  • Access to a test or lab environment for safe execution
  • Python 3.8+ with required dependencies installed
  • Appropriate authorization for any testing activities

Instructions

  1. Install dependencies: pip install requests
  2. Ingest log entries from syslog, JSON, or plain text files.
  3. For each entry, compute SHA-256 hash of: previous_hash + timestamp + log_content.
  4. Store the chain as a JSON ledger with entry index, timestamp, content hash, previous hash, and chain hash.
  5. Verify chain integrity by recomputing all hashes and detecting breaks.
  6. Optionally anchor checkpoint hashes to an external timestamping service.
bash
python scripts/agent.py --log-file /var/log/syslog --chain-file log_chain.json --verify --output integrity_report.json

Examples

Chain Entry Structure
json
{"index": 42, "timestamp": "2024-01-15T10:30:00Z", "content_hash": "a1b2c3...",
 "prev_hash": "d4e5f6...", "chain_hash": "SHA256(prev_hash + timestamp + content_hash)"}
Tamper Detection

If entry 42 is modified, chain_hash[42] will not match SHA256(chain_hash[41] + ...), and all entries from 42 onward will be flagged as invalid.

© mukul975, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (scripts, references) in skills/implementing-log-integrity-with-blockchain of mukul975/Anthropic-Cybersecurity-Skills.

  • SKILL.md
  • LICENSE
  • references/api-reference.md
  • scripts/agent.py

Open the folder on GitHubat commit 54a7988

Compare with similar skills

Implementing Log Integrity With Blockchain next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Implementing Log Integrity With Blockchain compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Implementing Log Integrity With Blockchain this skillmukul975/Anthropic-Cybersecurity-Skills34k—~611Automated safety check: PassApache-2.0
Fla Ascend Performancefla-org/flash-linear-attention5.8k—~6.3kAutomated safety check: PassMIT
Deepsec Documentation Guidevercel-labs/deepsec8.1k—~956Automated safety check: PassApache-2.0
Skill Scannergetsentry/skills1k4 repos~2.5kAutomated safety check: WarnApache-2.0
Serenity Aleabitoreddityan-labs/serenity-aleabitoreddit4811 repos~3.3kAutomated safety check: PassNone
Security Alert Triageelastic/agent-skills5921 repos~3.5kAutomated safety check: NotesApache-2.0

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Categories

Questions about Implementing Log Integrity With Blockchain

What does Implementing Log Integrity With Blockchain do?

Builds an append-only log integrity chain using SHA-256 hash chaining, where each entry incorporates the previous entry's hash so tampering invalidates all subsequent hashes; covers log ingestion…. Implementing Log Integrity With Blockchain is an agent skill from mukul975/Anthropic-Cybersecurity-Skills. Builds an append-only log integrity chain using SHA-256 hash chaining, where each entry incorporates the previous entry's hash so tampering invalidates all subsequent hashes; covers log ingestion (syslog/JSON/plain text), chain verification, pinpoint tamper detection, and checkpoint anchoring to external timestamping services.

When should I use Implementing Log Integrity With Blockchain?

Implementing Log Integrity With Blockchain fits situations like: tamper-evident log storage for compliance; verify whether log entries were altered.

How do I install Implementing Log Integrity With Blockchain in Claude Code?

Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-log-integrity-with-blockchain -a claude-code`. Or copy the skill folder (skills/implementing-log-integrity-with-blockchain in mukul975/Anthropic-Cybersecurity-Skills) into .claude/skills/implementing-log-integrity-with-blockchain in your project. Claude Code loads it when a task matches its description.

How do I install Implementing Log Integrity With Blockchain in Codex?

Run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-log-integrity-with-blockchain -a codex`. Or copy the skill folder (skills/implementing-log-integrity-with-blockchain in mukul975/Anthropic-Cybersecurity-Skills) into .agents/skills/implementing-log-integrity-with-blockchain in your project. Codex loads it when a task matches its description.

Can I use Implementing Log Integrity With Blockchain in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill implementing-log-integrity-with-blockchain -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/implementing-log-integrity-with-blockchain, .gemini/skills/implementing-log-integrity-with-blockchain, .github/skills/implementing-log-integrity-with-blockchain and .opencode/skills/implementing-log-integrity-with-blockchain in your project.

What does Implementing Log Integrity With Blockchain need to run?

Going by SKILL.md and its folder, Implementing Log Integrity With Blockchain needs Python for the scripts in its folder and the command-line tools its instructions call (python and pip). Our summary lists: Python 3.

Does Implementing Log Integrity With Blockchain access the network?

SKILL.md contains no URLs. Its commands use pip, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Implementing Log Integrity With Blockchain safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.

What licence does Implementing Log Integrity With Blockchain use?

Implementing Log Integrity With Blockchain is published under the Apache-2.0 licence (declared in SKILL.md). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Implementing Log Integrity With Blockchain use?

About 611 tokens (SKILL.md is roughly 2.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 374 tokens, read only when the agent opens those files.

What are the alternatives to Implementing Log Integrity With Blockchain?

Skills that share tags, products or a category with Implementing Log Integrity With Blockchain: Fla Ascend Performance (fla-org/flash-linear-attention, 5.8k stars), Deepsec Documentation Guide (vercel-labs/deepsec, 8.1k stars), Skill Scanner (getsentry/skills, 1k stars) and Serenity Aleabitoreddit (yan-labs/serenity-aleabitoreddit, 481 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Implementing Log Integrity With Blockchain?

mukul975 (a GitHub user) maintains it in mukul975/Anthropic-Cybersecurity-Skills, which has 33,993 GitHub stars. The repository holds 644 skills in this directory. The repository was last updated on August 31, 2026.

Source: mukul975/Anthropic-Cybersecurity-Skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.