Craig Solomon

@craigsolomon

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Founder, Fulcrum Enterprises — Building the Foundation for an AI Driven Future

FloridaJoined April 2026

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Founder, Fulcrum Enterprises. Building the foundation for an AI driven future.

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Freelance work

Craig Solomon's blogs

Craig Solomoncraigsolomon.hashnode.dev7 posts

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CSCraig Solomoncraigsolomon.hashnode.devJun 24 · 4 min read

Offline Blockchain Proof Verification with verify-proof Package

Your application receives a file and a JSON proof claiming the file was blockchain-anchored at a specific timestamp. You need to verify this claim without trusting the submitter. The verify-proof Pyth

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CSCraig Solomoncraigsolomon.hashnode.devJun 10 · 5 min read

SHA-256 Cryptographic Hashing for Developers: File Integrity Proof

You modify one pixel in a 4K image. The file size barely changes. But run SHA-256 on both versions and you get completely different 64-character hashes. This isn't a bug. It's the cryptographic avalan

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CSCraig Solomoncraigsolomon.hashnode.devMay 4 · 3 min read

Verify Blockchain Timestamps with Python's verify-proof Package

Verify Blockchain Timestamps with Python's verify-proof Package Your application receives a file and a JSON proof claiming the file was timestamped on a blockchain before a specific date. You need to verify that claim programmatically without trustin...

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CSCraig Solomoncraigsolomon.hashnode.devApr 28 · 5 min read

Verify Blockchain File Proofs with Python's verify-proof Package

Installing and Basic Usage The verify-proof package is available on PyPI and works entirely offline. It doesn't make network calls to validate blockchain transactions — instead, it performs cryptograp

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CSCraig Solomoncraigsolomon.hashnode.devApr 20 · 5 min read

Verify ProofLedger Blockchain Timestamps in Python

Your claims system receives a timestamped photo. The adjuster says it was taken before the storm. The metadata says yesterday. Who's right? When building software for insurance or legal contexts, you

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Craig Solomon

About

Available for

Craig Solomon's blogs

Recently published

Offline Blockchain Proof Verification with verify-proof Package

SHA-256 Cryptographic Hashing for Developers: File Integrity Proof

Verify Blockchain Timestamps with Python's verify-proof Package

Verify Blockchain File Proofs with Python's verify-proof Package

Verify ProofLedger Blockchain Timestamps in Python

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Craig Solomon

About

Available for

Craig Solomon's blogs

Recently published

Offline Blockchain Proof Verification with verify-proof Package

SHA-256 Cryptographic Hashing for Developers: File Integrity Proof

Verify Blockchain Timestamps with Python's verify-proof Package

Verify Blockchain File Proofs with Python's verify-proof Package

Verify ProofLedger Blockchain Timestamps in Python