@craigsolomon

Craig Solomon

@craigsolomonFloridaJoined April 2026

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

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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.dev9 posts

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CSCraig Solomoncraigsolomon.hashnode.dev13h ago · 7 min read

SHA-256 Anchoring and Proof Polling in TypeScript

You hash a file, POST the digest to a blockchain anchoring API, and need to know when the on-chain confirmation lands before returning a response. The naive path is to submit and assume. The productio

CSCraig Solomoncraigsolomon.hashnode.dev6d ago · 7 min read

Dual-Chain Blockchain Anchoring via REST API in Python

You've got a file. You need an immutable timestamp on Polygon and Bitcoin. The file stays on your machine. Only the SHA-256 hash leaves. Three API calls to the ProofLedger v1 API and a polling loop ge

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

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

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...