Privacy Lego: Where Does Cashu Fit in Your Bitcoin Stack?
summary
Cashew is a bearer-token e-cash system built on a Rust CDK that issues blind-signed tokens interoperable with Lightning (Bolt11/BOLT12) and usable as instant, private, sometimes-offline payments. Demos show a search paywall using HTTP 402 X-Cashu header and Athena’s custom mint with one-search-token units, a Goose AI integration that tops up via tokens, and an offline flow using pay-to-pubkey locked tokens plus epoched bloom-filter double-spend protection with a later batch claim. Main trade-off is custodial single-mint risk; multi-mint MPP and SDKs mitigate it.
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chapters (17)
- 0:00Privacy Lego and Cashu intro
- 1:02Bitcoin Lightning payment limits
- 2:28What Cashu is and how it works
- 5:18Cashu with Lightning Network
- 6:19Cashu in your privacy stack
- 7:23Micropayments and paywalls with Cashu
- 10:12Receiving payments with Bloom filters
- 12:40Custom mint vs wallet for paywalls
- 14:25Privacy-friendly AI queries with Cashu
- 17:59Tipping donations and static requests
- 19:45Offline transactions with Cashu
- 22:33Programmable conditions and HTLCs
- 24:42Cashu privacy benefits and trade-offs
- 25:44Custodial risks and multi-mint payments
- 26:49Cashu future and ecosystem growth
- 27:53Cashu DevKit and resources
- 28:36SDKs and language support
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