Under the Hood

Blockchain in plain words: copies, blocks, and links — and why one cheater's edited copy always loses.

What a hash is, and how one number per page makes the whole chain tamper-evident.

The address you share, the key you guard with your life, and the signature that can't be forged.

Why burning electricity to guess numbers is the strangest — and most effective — security system ever built.

The difficulty adjustment, the halving, and the honest limit of what scarcity can and can't do.

The longest-chain rule, what confirmations really buy you, and what a 51% attack could never do.

Open a block explorer and audit the live Bitcoin network yourself — no permission, no account.