Let a real teammate (manager/peer) co-sign a specific message/thread so a recruiter can trust it at a glance.

Trust model (clear, layered, realistic)

A vouch can have up to three independent signals. Show them as a stack so viewers know what was proven:

1. Identity Verified — endorser logged in with LinkedIn (OIDC).

   • What it proves: “This is a real LinkedIn member.”

   • Notes: LinkedIn supports Sign-in with LinkedIn using OpenID Connect; you can get a stable user ID + profile basics after consent. Rich employment data usually needs special approval.

2. Company Affiliation Verified — endorser proves they worked at <company> (now or previously).

   • Primary method: work-email magic link (e.g., sam@acme.com) → “Company verified” check.

   • Alternatives for alumni: upload a redacted offer letter/pay stub (date + company name only), or a second endorser with the same domain (2-endorser rule).

3. Overlap & Role — endorser attests they worked with you on this (role + dates).

   • You collect: relationship (Manager/Peer/Stakeholder),

End-to-end flow

A) Author

1. Posts a claim (message) and optional assets in a channel.

2. Clicks Request vouch → gets a unique invite link.

3. Sends it to a manager/peer (email, DM, LinkedIn message).

B) Endorser

1. Opens invite → sees only the claim snippet + any attached artifacts.

2. Signs in with LinkedIn (OIDC). (Identity ✓)

3. (Optional but powerful) Clicks Verify work email → we send a magic link to @company.com. (Company ✓)

4. Selects Relationship + Dates, adds a short note, clicks Confirm. (Overlap ✓)

C) Display

• On the message/thread, show a tiny shield: Vouched ✓✓ (hover → panel).

• Hover panel shows:

  • Endorser avatar, name, title, company, LinkedIn link

  • Checks for Identity / Company / Overlap

  • Their one-line note & date of vouch

• Click → small card with details and a “See LinkedIn profile” link.

D) Privacy & control

• Endorser can revoke any time.

• Authors can hide a vouch (e.g., if it includes sensitive info).

• Viewers see “Private details hidden” when evidence is redacted.

UI copy (drop-in)

• Badge (compact): Co-signed by Sam Lee · ✓ Identity · ✓ Company · ✓ Overlap

• Tooltip header: Verified signals

• Tooltip items:

  • ✓ Signed in with LinkedIn (view profile)

  • ✓ Verified @acme.com email

  • ✓ Worked with Alex (Manager, 2023–2024)

• CTA button for authors: Request co-sign

• CTA for endorser: Confirm & co-sign

• Revocation: Withdraw co-sign (You can remove this at any time.)