DigiCash turned down Bill Gates. e-gold got indicted. Five pre-Bitcoin failures, and what each one got right first.

Before Bitcoin: The Failed Attempts at Digital Cash

Blockchain encryption' is a myth; Transactions are signed, not encrypted. Here's what symmetric and asymmetric crypto actually do.

Symmetric vs Asymmetric Cryptography, and What Blockchain Actually Uses

Beyond slow and energy-hungry: bridge hacks, invisible MEV taxes, and the GDPR problem nobody's fully solved.

The Limitations Nobody Puts on the Slide

Diamonds, durians, refugee aid, and treasury bonds — 5 blockchain projects actually running today, not just hype.

Genuinely Cool Things Blockchain Is Doing Right Now

Blockchain solves one specific problem brilliantly, and gets bolted onto a hundred others that never needed it.

Do We Actually Need Blockchain?

PoW vs PoS, actually explained: riddles, slashing, 51% attacks, and the clever 'short and attack' critique nobody mentions.

Proof of Work vs Proof of Stake — Without the Jargon

Signing, verifying, mining, settling: the complete lifecycle of a crypto transaction, explained without the jargon.

What Actually Happens When You Send Crypto?

How do strangers trust each other with no bank and no password? Public and private keys, explained with paint, safes, and Sudoku.

Public and Private Keys, Explained

What happens when a 'beginners' talk gets expert-level questions? A recap of my Blockchain for Beginners session and audience Q&A.

What I Learned Presenting "Blockchain for Beginners"

Blockchain from the ground up: trust, transactions, cryptography, consensus, applications, and the technology behind the hype.

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