The Digital Yuan

China’s e-CNY — the digital yuan — is the most advanced large-scale CBDC in the world. Hundreds of millions of dollars have flowed through it across dozens of cities since 2020.

Most of it works like any digital payment app — wallet on your phone, QR codes, fast and convenient. Fine.

But some pilots included a feature that’s worth sitting with.

The government issued e-CNY with an expiry date. Money that stopped being valid after a set period if unspent. The stated reason: to stimulate consumption during economic slowdowns. If people know their money expires, they spend it instead of saving it.

It worked, technically. Spending increased in the pilot areas.

But think about what this actually is. Physical cash doesn’t expire. The renminbi note in your wallet is yours indefinitely. You can save it, give it away, spend it in five years. It’s yours.

Expiry-date money isn’t money in the traditional sense. It’s a conditional voucher — useful for its stated purpose, valid under the conditions the issuer sets, for as long as the issuer decides.

The Chinese government isn’t hiding this. Central bankers from other countries study the e-CNY program openly and with interest. The implicit question in those studies: what else could we do with this?

The answer, architecturally, is almost anything. The expiry date feature is a small demonstration of a much larger capability — money that behaves however the issuer codes it to behave.

Tomorrow: the petrodollar — what it is and why it matters for Bitcoin.

— The Daily Bit