Silent Payments and Alternatives to Bitcoin Privacy
summary
Compares concrete designs for non‑interactive private payments: silent payments derive a shared secret from sender input key + recipient pubkey so transactions look normal but require full‑node scanning; reusable payment codes / Bit 47 and BIP‑351 use on‑chain notifications or blinding and leak less scanning cost but add an extra transaction; semi‑interactive xpubs and trustless address server proposals solve UX but hit the gap limit (e.g. 100) unless senders precommit via a non‑fresh transaction (double‑sign) as an anti‑spam cost. A w0xlt proof‑of‑concept on GitHub / bitcoin‑chords exists and shows promising scanning performance.
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chapters (37)
- 0:00Intro
- 0:50The problem with single addresses
- 1:30Noninteractivity solutions
- 2:20Semiinteractivity solutions
- 3:00Simpler payments
- 3:30Gap limit
- 4:00How it works
- 5:00Gaps
- 6:00Automated Interaction
- 7:00BTC Pay Server
- 8:00Trustless Address Server
- 9:00New Problem
- 10:00Pay Server
- 11:00Gap Limits
- 13:00The idea
- 16:00Complexity
- 17:00Noninteractive solutions
- 18:00Cryptography
- 19:00Shared Addresses
- 20:00OnChain Notification
- 21:00OnChain Payment
- 22:00OnChain Notifications
- 23:00OnChain Controversy
- 24:00Message on Chain
- 26:00Can we just have Alice communicate
- 27:00You have control over your funds
- 28:00The blockchain guarantees that the notification arrives
- 29:00Bit47 variants
- 30:00Batch notifications
- 31:00Compatibility
- 32:00Private Payments
- 33:00Notifications
- 34:00Tradeoff
- 35:00Silent Payments
- 36:00Scanning Requirements
- 38:00W0XLT
- 39:00Help Silent Payments
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