Latest revision · v1.0.1
Stablecoins
Tether's USDT: what backs the dollar token and who can redeem it
Tether says each USDT is redeemable for one dollar, and BDO checked its reserves as of June 30, 2026, but only verified customers can redeem.
Le Coin / Learning Hub
Learning Hub
Plain-English explainers on how blockchains, stablecoins and crypto infrastructure work. Sourced line by line, versioned, free as PDF.
01 Mechanics only. No prices.
02 Every claim sourced.
03 Versioned with a changelog.
Latest revision
The first card is the most recently updated dive
Wallets & custody
Wallets and custody, explained: who holds the keys
A plain guide to how crypto keys are made and stored, the difference between holding them yourself and using a custodian, and the US rules for custodians, including one that is still only a proposal.
Prediction markets
Polymarket and Kalshi side by side: how two prediction markets work
Both sell contracts that pay a fixed amount if an event happens, but they differ on who records trades, who decides outcomes and how the CFTC oversees them.
Stablecoins
USDC
USDC is a dollar token issued by Circle Internet Financial, LLC, and runs on many blockchains.