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gabrielmoreira (@gabrielmoreira) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Implementing Log Integrity With Blockchain by gabrielmoreira

Name: Implementing Log Integrity With Blockchain
Rating: 4.2 (5 reviews)
Author: gabrielmoreira

Implementing Log Integrity With Blockchain

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.

gabrielmoreira Updated Sep 9, 2026 17 repo stars

File contents

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

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

python scripts/agent.py --log-file /var/log/syslog --chain-file log_chain.json --verify --output integrity_report.json

Examples

Chain Entry Structure

{"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.

---name: implementing-log-integrity-with-blockchaindescription: 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.license: Apache-2.0--- # 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.

Frequently asked questions