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6/10

ClientVault — One-Time Links for Solo Service Businesses

Solopreneurs (bookkeepers, lawyers, therapists) drop a client document or access code into ClientVault and send a self-destructing link instead of unsecured email attachments.

Target user

Solo accountants, therapists, and lawyers exchanging sensitive docs with clients over email

Features
  • Branded sender link (yourname.clientvault.app) so clients trust the handoff
  • Per-client audit trail showing when a document was viewed, signed, or expired
  • Templates for recurring handoffs (weekly invoice, monthly statement) that auto-expire
  • HIPAA/GDPR-friendly hosting options and a signed data-processing addendum
Why now

Independent professionals handle sensitive data daily and the Flashpaper-style zero-knowledge framing gives them a compliance-friendly pitch they can quote to worried clients.

Signals · overall 6/10
Demand
5/10

HN attention to zero-knowledge sharing suggests pent-up demand from privacy-aware professionalsSecure file sharing for accountants | TaxDome

Whitespace
6/10

Specialized consumer-grade secure-sharing tools for solopreneurs are sparse outside enterpriseSecure file sharing for accountants | TaxDome

Monetization
7/10

Solopreneurs already pay monthly for practice-management software (e.g. Karbon, HoneyBook)Secure file sharing for accountants | TaxDome

Longevity
7/10

Compliance and confidentiality needs for regulated professionals are structurally durable

Feasibility
7/10

Largely same build as consumer version with added template and audit-log layers

Show HN: Flashpaper – Self-destructing secret sharing with no database · 14 points · 2 commentsHacker News · 2026-07-28 (today)