Nostr Identities and Disposable Keys

Mentor Sessions Ep. 056: Bitcoin Privacy Is At Risk (But These Fixes Are Coming) | NVK & Francis Pouliot

Address reuse is silently destroying Bitcoin privacy—and most Bitcoiners have no idea how exposed they are. Coinkite founder NVK and Bull Bitcoin founder Francis Pouliot break down the most critical privacy vulnerabilities in Bitcoin today, why kidnappings tied to crypto wealth are surging across Europe (one every four days in France), and the technical solutions finally closing the gap. From silent payments and async pay join to BIP322 proof of reserves and UTXO management, this is the most comprehensive Bitcoin privacy conversation of 2025. Learn why giving your xpub to an exchange is catastrophic, how 5% pay join adoption could break chain analysis entirely, and why Nostr disposable identities may be the missing piece for private payments. If you hold Bitcoin, this episode could protect your life—not just your stack.

About NVK: Founder of Coinkite, creators of the COLDCARD.

🐦 https://x.com/nvk | 🌐 https://coinkite.com

About Francis Pouliot: CEO of Bull Bitcoin.

🐦 https://x.com/francispouliot_ | 🌐 https://bullbitcoin.com

Chapters:

00:00:00 Teaser & Intro – Bitcoin Privacy Risks Are Real

00:01:05 Where Bitcoin Self-Custody Stands Today

00:03:32 Three Unsolved Bitcoin Problems: Privacy, Speed & Inheritance

00:05:46 The UX Problem: Aggregating Bitcoin Tools

00:08:16 Dangers of Single-Vendor Bitcoin Solutions

00:11:27 Silent Payments Explained: What They Are & Why They Matter

00:13:06 Async Pay Join & BIP77: Underused Privacy Tool

00:15:35 Why Receiving Silent Payments Is Hard

00:17:10 Nostr as a Payment Identity Layer

00:19:41 Disposable Identity: The Missing Privacy Piece

00:23:00 Silent Payments Into Wasabi: The Dream Flow

00:28:13 Why xpub Sharing Is a Privacy Disaster

00:30:44 On-Chain Privacy vs Layer 2 Privacy

00:33:38 How Pay Join Breaks Chain Analysis

00:37:11 Network-Level Privacy Tools: Kyoto & Floresce

00:39:43 Why Bitcoin Kidnappings Are Surging in Europe

00:41:32 Identity Leaks & KYC Data Exposure

00:44:04 ColdCard Firmware: BIP322 Proof of Reserves

00:48:20 WIF Private Key Signing on ColdCard

00:51:34 UTXO Management: The Underrated Problem

00:54:14 Push Transactions & Broadcast Privacy

00:59:43 Migrating Wallets Privately: The Right Way

01:05:06 Lightning at Merchant Scale: Still Not There

01:09:39 Cashu Mints, Federation Models & Trust Trade-offs

01:14:26 MintChip: Canada's Forgotten Digital Cash

01:19:57 Liquid Network, Stablecoins & Confidential Transactions

01:32:44 Depix: Brazil's Liquid Stablecoin Explained

01:37:00 Bitcoin Development Happening at the App Layer

01:39:17 What's Coming from Coinkite & Bull Bitcoin

⚡ Abundant Mines – Fully managed Bitcoin mining: https://qrco.de/bgYKPB

🔒 COLDCARD – 5% off the best hardware wallet: https://qrco.de/bfiDBV

🛡️ Dirty Man Safe – 10% off with code BTCSESSIONS: https://dirtymansafe.com

🏠 Horizon – Unlock home equity for Bitcoin: https://joinhorizon.com/?ref=BTCSESSIONS

💡 Bitcoin Mentor – Book a private session: btcmentor.io

Previous Episode with Matt Hill: https://youtu.be/Dv1-JfjxuAY

Follow Us on X: @BTCsessions | @theBTCmentor | @GaryLeeNYC

#Bitcoin #BitcoinPrivacy #SilentPayments #PayJoin #ColdCard #NVK #FrancisPouliot #BullBitcoin #Coinkite #UTXOManagement #BitcoinSecurity #ChainAnalysis #BIP322 #ProofOfReserves #LightningNetwork #Nostr #BTCSessions #BitcoinPodcast #SelfCustody #HardwareWallet