Kate's out sick, so Brandon flies solo. The headline: a researcher used Claude Opus 4.8 to find a counterfeiting bug in Zcash's shielded pool that could've minted unlimited coins undetectably — ZEC fell 30%. Plus a Bitcoin selloff below $60K, Strategy's quiet sale, and Lava's Bitcoin-back card.

In this episode of Good For Bitcoin, Brandon and Kate discuss:

Kate's out sick, so it's a short, solo, rapid-fire show this week.
Market check: Bitcoin slid below $60K, down 21%+ on the week, with Fear & Greed in extreme fear.
Treasury watch (busier than usual): buys from Strive (+2,500 to ~19,000 BTC), Orange BTC, Capital B, Smarter Web and DDC; sells from ProCap (-52) and Canada's Bitcoin Treasury Corp (-3.64).
Strategy sold 32 BTC (~$2.5M) — just 0.004% of its stack — yet got blamed for the selloff, even though it bought ~25,000 BTC two weeks ago. The frustrating part: Saylor stayed silent. With an avg cost near $75K, MSTR and STRC both dipped.
Lava launched a Bitcoin-back Visa: up to 5% back in BTC at partners, 3% in the US, 1% abroad, no annual or FX fees. It's a secured hybrid funded by your Lava balance — top up via bank transfer, stablecoins, or a Bitcoin-backed loan.
The big one: researcher Taylor Hornby found a critical counterfeiting bug in Zcash's Orchard pool that could've undetectably minted unlimited ZEC — and its privacy means no one can prove if it was exploited. Arthur Hayes dumped his stack. The kicker: Hornby found it using Claude Opus 4.8, which surfaced it ~25% of the time. ZEC fell 30%, with Zooko pointing to a network upgrade to restore trust.
Quick hits: the US Treasury froze Iranian leaders' accounts and seized $1B+ in stablecoins (easy to seize — unlike Bitcoin); the first Coinbase x Fannie Mae crypto-backed mortgage funded; and a crypto-tax hearing next week with seven House bills on stablecoins, mining, double-taxation, and a possible de minimis exemption.
Follow the show on X — @goodforbtc.

Hosts:

Brandon Marshall — @marshallmixing
Kate Parkman — @katemparkman

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