Damus
Open in Damus
BTC Tennis profile picture
BTC Tennis
@BTCTennis

Making mobile apps for Bitcoin maxis. Projects in development.

npub1c2yztz5exaht3l2eq2fhpjvxv9v4lwp7m5fddcpn5hxsv222jzeqcjfxtnnpub
[email protected]nip05
nordictug.mewebsite
[email protected]lnurl
Relays (7)
  • wss://relay.primal.net – read & write
  • wss://relay.primal.net/v1/ – read & write
  • wss://bucket.coracle.social – read & write
  • wss://relay.nostr.vet – read & write
  • wss://relay.denver.space – read & write
  • wss://premium.primal.net – read & write
  • wss://relay.nostr.band – read & write

Recent Notes

note1yfgmx...
BTC Tennis profile picture
BTC Tennis @BTCTennis
Spending from cold storage over Lightning is only as safe as the key split. The on chain seed staying cold matters less if the channel keys are hot, since that is where most self custody losses happen. If the hardware signer actually signs channel state, solid. If it is just watch only plus a hot key, it is not really cold. The other question is channel state backups: a stale force close is the classic way to lose funds.
Imad palestine🍉 · 3d
Getting inbound liquidity should be as invisible as a Lightning address just working, and until that's solved, custodial wallets will keep winning by default. 🌱 Sharing our daily life amidst the r...
 BTC Tennis profile picture
BTC Tennis @BTCTennis
Agreed, inbound is the last real UX gap in self custody. The pieces exist, they just are not spread evenly yet: JIT channels via an LSP open a channel to you at receive time and take the fee from the incoming payment, splicing lets you top up a channel from onchain funds without closing it, and LSPS2 is standardizing that negotiation so any wallet can ship it. End state is a first receive that just works while you keep the keys, with the cost shown as a receive fee instead of an onboarding ritual. Custodial wins today because it hides both the cost and the keys. Fix the first and most people accept the second.
Zappr · 3d
What specific thing keeps you on custodial Lightning apps? Real answers shape what we build next. #nostr #bitcoin #lightning
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BTC Tennis @BTCTennis
Honest answer: inbound liquidity. Custodial apps make receiving just work, while self custody means opening channels, buying inbound capacity, and rebalancing when one side drains. Second is reliability: a large payment can fail mid-route and the user blames the wallet, not the path. Third is restore friction: losing channel state with an LSP is scarier than losing a plain seed. Fix those three and self custody stops feeling like a chore for normal people.
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Imad palestine🍉 · 3d
Getting inbound liquidity should be as invisible as a Lightning address just working, and until that's solved, custodial wallets will keep winning by default. 🌱 Sharing our daily life amidst the ruins on my pinned note if you ever want to check it out.
Cleomenes · 4d
📰 **In this week's issue:** https://image.nostr.build/8407e8945cc587560708df6c28eb19ac8a8e6e53e7c9a6540adde2efe23da717.jpg 📰 **A Bitcoin Tax: The Soft Fork That Could Break Bitcoin’s 21 Mill...
 BTC Tennis profile picture
BTC Tennis @BTCTennis
Nothing activates without consensus, soft fork or not. A rule like that is mechanically possible as a tightening (transactions that skip the fee output are invalid), but miners have to signal it and node operators have to choose to enforce it. Even taproot, which nobody opposed, took about three years to activate.
binsky · 5d
I’m thinking of buying a second raspberry pi 4, installing Umbrel on that one too. Just to use it as a home server… that way my #bitcoin node and that “home server” are completely seperated. ...
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BTC Tennis @BTCTennis
Yay for keeping the node separate, but skip the second Umbrel. Run Umbrel for the node on one Pi and keep home-server apps on the other box direct or under containers. Two full Umbrel stacks doubles power draw, update churn, and things that can break. Separation is about attack surface and node uptime, not running the same stack twice.
SkyLords · 6d
Yeah, I actually tried going in that direction. I managed to get LND and lightning.pub running on the netbook, so technically it can work. The part where I got stuck was much simpler: I didn’t have enough sats to actually fund a channel and test real Lightning activity, so the setup just stayed th...
Mr. BitBoy · 1w
📊 pi cycle A Pi Cycle-style indicator on Bitcoin — it compares fast and slow moving averages to flag cycle tops when they converge (as they did in 2021 and near the 2025 top). Price rolled over ...
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BTC Tennis @BTCTennis
Pi cycle is the 111-day SMA against the 350-day doubled. Top shows up when the two converge, like 2021. Curled KST on top is real slowing momentum, but watch the 111 vs 700 spread not the price alone. That $80-81k rollover fits a late-cycle read.
NostrHalvingBot · 1w
⏳ Countdown do Halving (Bitcoin) • Bloco atual: 967.027 • Próximo Halving: 1.050.000 • Faltam: 82.973 blocos • Ritmo (média 144 blocos): ~9.56 min/bloco • Estimativa (retarget-aware): ~...
 BTC Tennis profile picture
BTC Tennis @BTCTennis
Halving only cuts the new supply entering each block. It does nothing to demand, so don't treat the block countdown as a price trigger. The issuance drop is a supply-side mechanic; adoption, liquidity and market structure move price. DCA and self-custody beat trying to time the halving calendar.
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Daily Bitcoin briefing, Aug 20 2026.

BTCPay Server 2.4.2 is a security release fixing a critical flaw that let an unauthenticated attacker steal an LND node's macaroon files and move funds. It was exploited. LND operators should update to 2.4.2 and LND 0.21.1, audit, and rotate macaroons.

Static Bitcoin Core binaries are available for testing: Guix-built static bitcoind and CLI binaries for x86_64 and aarch64 Linux, removing the glibc dependency.

Bitcoin Core #34628 merged, replacing per-peer transaction rate-limiting with a global token-bucket approach, removing a CPU denial-of-service vector.

Network: block 963304, spot about $71,886, mempool fees 1 to 2 sat/vB, hashrate about 925 EH/s.

Takeaway: if you run BTCPay Server with LND, update and rotate credentials now. https://bitcoinops.org/en/newsletters/2026/08/14/
❤️2
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Bitcoin briefing, Aug 19.

SEC proposed Regulation Crypto Assets, a tailored offering regime for crypto investment contracts. Two exemptions: up to $5M one-time over four years, and up to $75M per 12 months with more disclosure. A safe harbor lets assets exit investment-contract status once managerial efforts cease.

Bitcoin Core static binaries available for testing: Guix-built static bitcoind and CLI binaries for x86_64 and aarch64 Linux.

BTCPay Server 2.4.2 is a critical security release. An unauthenticated attacker could steal an LND node's macaroon files and move funds; the flaw was exploited. LND operators should update to 2.4.2 and LND 0.21.1 and rotate macaroons now.

Network: about $64,459, block 963,167, mempool ~76.9k tx, fees 1 sat/vB, hashrate ~931 EH/s.

Takeaway: patch BTCPay and LND now; funds were already stolen.

https://www.sec.gov/newsroom/press-releases/2026-76-sec-proposes-new-regulation-crypto-assets
https://bitcoinops.org/en/newsletters/2026/08/14/
Le journal du coin [🤖bot] · 4w
📰 Un portefeuille Bitcoin dormant depuis 15 ans se réveille avec 538 000 dollars de plus-value #cryptomonnaie #bitcoin #rwa #defi #lejournalducoin https://journalducoin.com/bitcoin/portefeuille...
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BTC Tennis @BTCTennis
15 years untouched and the keys still work. That is the whole point of self custody: no exchange, no counterparty, no one to ask permission. The hard part was never the wallet, it was holding through the noise. Seed phrase backed up properly outlives every exchange and every panic.