WPBV Radio
Latest explainers
View allThe Briefing
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Before You Give an AI Agent Access to Your Inbox
Reading mail and sending it are different permissions. Start with the job you actually want done.
10 People Shaping Fintech
Ten people whose work helps explain where payments, digital banking and financial infrastructure are going.
What Happens After You Tap Your Card?
The terminal's approval is one step in a longer journey from a payment request to settled funds.
AI
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Prompt Injection Explained: When an AI Tool Obeys a Stranger
How text in an email, page or file can redirect an AI tool, and which controls limit the damage.
Retrieval-Augmented Generation Explained: How AI Answers From Your Documents
How RAG tools search your documents before answering, and how to check what they say.
Context Window Explained: What an AI Tool Can Keep in View
What fills an AI tool's context window, how tokens are counted and why long chats lose track.
Payments & Fintech
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Debit Card Routing: Why US Debit Cards Carry Two Networks
The US two-network debit rule, what card networks may not restrict, and the Regulation II fee cap.
Interchange Fee vs MDR: Which Part of a Card Fee Is Which
The MDR is the whole charge for accepting a card; interchange is the issuer's slice inside it.
3D Secure Explained: Why Some Card Payments Ask for a Second Step
Why your bank asks you to approve some online card payments, when it can skip the step, and who pays for fraud.
Crypto & Web3
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Crypto Gas Fees Explained: Work, Price and the Final Bill
Read Ethereum fees by separating gas used, price per gas and the final execution charge.
Blockchain Bridge Explained: Assets, Proofs and Risk
Follow a cross-chain transfer from its source transaction to the asset received on the destination chain.
Blockchain Finality Explained: When a Crypto Payment Is Final
How Bitcoin, Ethereum and Solana decide when a transaction can no longer be reversed.
Apps & Software
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Device Code Flow Explained: Why a TV Shows a URL and Code
Why TVs show a URL and short code, how OAuth approval works and which phishing check matters.
Staged Rollout Explained: Why an App Update Reaches You Days Later
A release announcement and your device's update are different events. Staged rollouts explain the gap.
What to Do If Your Password Manager Is Breached
Password manager breach response: secure email, rotate key credentials, revoke sessions, and avoid phishing.
Tech & Internet
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Chrome Origin Trials: How to Test Browser Features Safely
How trial tokens enable experimental browser features, and how to keep a usable fallback.
What Is a CDN? How Edge Caching Works
How a CDN uses edge caches, origins and TTLs—and what it cannot fix.
BGP Explained: How Routes Spread
How BGP spreads routes, why bad announcements travel, and what RPKI origin validation checks.
Startups & Ventures
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Tender Offers for Employees: Shares, Limits and Cash
Check eligible shares, sale limits and deductions before treating an employee offer as cash.
Down Round Explained: Price, Dilution and Options
See how a lower share price changes ownership, investor rights and employee options.
Startup Runway Calculation: Burn Rate and Cash
Calculate startup runway from cash and net burn, with worked numbers and a check for uneven payments.