UTXO The Webmaster joins to discuss his new android nostr client Wisp, spark wallet integration, encrypted nsec seed backups, and his controversial "Send Money" normie mode that denominates zaps in dollars. We get into follower count philosophy, what actually counts as a user on an open protocol, and why half of bitcoin twitter still hates nostr. Then we go deep on AI: his local rig running Qwen 3.6, on device spam filtering with nspam, whether Claude is subsidizing us into oblivion, and what happens to big tech jobs when a unicorn only needs three employees.

UTXO on Nostr: https://primal.net/utxo
Wisp: https://wisp.mobile/

EPISODE: 200
BLOCK: 946079
PRICE: 1320 sats per dollar

(00:02:05) Wisp origin story

(00:02:39) Why Wisp? Stability, UX focus, and the outbox model

(00:05:30) Availability: Android, beta rollout, and Zap Store install

(00:06:14) Onboarding with Spark, Zaps, and wallet backups via nsec

(00:09:02) Custody, risk, and privacy tradeoffs for Nostr Zaps

(00:11:27) Wisp’s "send money" UX and fiat denomination debate

(00:16:39) Do small zaps feel insulting? Behavioral effects of denominating in fiat

(00:17:06) Follower counts: definitions, reputation, and network-relative views

(00:23:07) Bots, fake metrics, and survivorship bias on open networks

(00:31:23) Keys, compromises, and practical key rotation culture

(00:38:05) AI tools in Wisp development and local vs cloud models

(00:45:49) nspam: on-device reply filtering without killing good bots

(00:47:53) Bots with their own feeds, rate limits, and unstoppable relays

(00:53:08) Growth via creators: streaming, ZapStream, and multi-platform outreach

(00:58:58) Mirroring vs authentic posting: does it feel stale or disrespectful?

(01:02:11) Businesses living on multiple platforms and Bitcoin payments

(01:03:04) Daily AI workflow: Claude, APIs, local models, and cost control

(01:06:44) Privacy, local hardware as luxury, and pay-per-query services

(01:11:11) Five-year AI outlook: limits, jobs, bubbles, and lean megacorps

(01:21:26) Closing thoughts and next steps: try Wisp, share feedback

Craig Raw, creator of Sparrow Wallet, joins to discuss silent payments, a new bitcoin address system that eliminates address reuse, removes the gap limit, and aligns privacy with convenience. Craig walks us through the history of bitcoin address derivation from single key to hd wallets to bip 47, then explains how silent payments optimizes everything except scanning cost and how his new server implementation, Frigate, uses gpu acceleration to mitigate that. We discuss the path to adoption including hardware wallet support, public server infrastructure, bip 353 human readable addresses, and the overall vision of upgrading from hd wallets to sp wallets.

Craig on Nostr: https://primal.net/craigraw
Craig on X: https://x.com/craigraw
Sparrow Wallet: https://sparrowwallet.com
Frigate Repo: https://github.com/sparrowwallet/frigate

EPISODE: 199
BLOCK: 944916
PRICE: 1384 sats per dollar

(00:03:09) Craig Raw of Sparrow Wallet

(00:03:27) Silent Payments: what they are and why they matter

(00:06:01) From single keys to HD wallets: history and limits

(00:11:41) Address reuse in the wild and UX realities

(00:11:50) BIP47 review: pros, cons, and hardware wallet hurdles

(00:15:18) Enter Silent Payments: design tradeoffs and hardware support

(00:19:01) Key benefits: static codes, enforced freshness, no gap limit

(00:21:02) The scanning-cost problem and early client approaches

(00:25:27) Server-side strategy: database tweaks and GPUs

(00:29:15) Why public servers matter and performance breakthroughs

(00:33:37) Frigate with Electrum backends: deployment paths

(00:37:20) Risks with public servers and practical mitigations

(00:43:10) Uncle Jim model and GPU-ready home servers

(00:46:21) GPU backends: CUDA, OpenCL, Metal and real-world nodes

(00:47:34) Running everything on a laptop and pruning considerations

(00:49:11) Human-readable addresses: DNSSEC and BIP353

(00:55:14) What’s needed next: hardware, node vendors, and runners

(00:58:13) PSBT details, DLEQ proofs, and multisig caveats

(01:02:13) Timeline to usable SP wallets and public servers

(01:06:10) Reframing SP as UX: contacts and everyday payments

(01:07:22) Ecosystem fit: who could ship this first

(01:08:31) Wrapping up: calls to action and outlook

(01:10:03) Closing notes: upcoming guests and events

Justin, a prolific contributor to the Fedimint open source project, returns for a six month update. Fedimint is an open protocol providing easy to use, private, programmable, and offline bitcoin payments using bitcoin powered federated chaumian ecash.

Justin on Nostr: https://primal.net/p/nprofile1qqspg8fq209jj56663d2n6r9ehkyjffy7rkqqejfdwvtwzva426avkqxtxxuv
Fedimint Website: https://fedimint.org/
Fedimint on X: https://x.com/fedimint
The Ecash App: https://ecash.love/
Fedimint Observer: https://observer.fedimint.org/
Bitcoin Mints: https://bitcoinmints.com/
Iroh: https://www.iroh.computer/

EPISODE: 198
BLOCK: 944073
PRICE: 1466 sats per dollar

(02:06) Justin on Fedimint updates since last visit

(03:20) Ecash App vision as a Fedimint reference client

(04:18) Wallet features: on-chain, lightning, ecash, and nostr integrations

(06:01) Fedimint 101: federations, guardians, and multisig trust model

(07:55) Uptime vs. rug risk and Byzantine fault tolerance in practice

(09:18) Making guardianship easier and raising operational reliability

(10:14) Ecash App status, platforms, backups via nostr, and seed UX

(13:16) Mint/federation selection challenges and web-of-trust ideas

(15:39) Observability tools and on-chain vs. Lightning differences

(16:20) Running a Guardian on Start9: setup and backups

(19:39) Networking with Iroh: DNS removal, privacy, and Tor/VPN plans

(23:14) Lightning gateways: roles, trust, liquidity, and multi-federation ops

(27:59) Gateway UX: multiple gateways, auto-switching, and agents help

(29:01) Gateway pairing and funding flows for Start9 deployments

(32:24) Guardians on Android phones: why, how, and trade-offs

(37:30) Blockchain backends: Bitcoin Core vs. Esplora defaults

(39:30) Mobile data, heat, and practical considerations

(39:34) Agentic payments and why eCash fits well for agents

(43:40) Local communities, AI models, and community services vision

(46:06) Real-world adoption, roadmap, modules, and BOLT12 plans

(48:50) BOLT12 receive-side challenges and trust model nuances

(50:26) Pragmatic trust, permissioned gateways, and next steps

(50:37) How listeners can help and contact info

(51:18) Start9 v0.4.0 update chatter and flashing war stories

(53:01) Closing thoughts, progress praise, and sign-off