customer success report · attested

Letterstory

software · app.letterstory.com

Attested customers: 1
Features proven: 0
Sessions / 30d: 1
Last attested: 2026-10-04 12:05Z

69 more companies have been observed using Letterstory but are not published as a customer — either not yet recorded, or recorded without consent to be named. Not counted above.

Published claims

Casey Millstein

✓ Verified · tier 4

caseymillstein.com

Active since 2026-10-03

Sessions / 30d: 1
Seats active: 0

lp-d157ef400e · ymJBr_qv--e87rmk…· 12 snapshots chained

Feature-level proof

Customer	sso	audit_log	api	analytics	sla
Casey Millsteincaseymillstein.com	—	—	—	—	—

Every ✓ is an individually signed attestation — an agent can verify any single cell.

Agent-readable

GET /proofs/letterstory.json— this report
GET /attest/letterstory.json— the vendor-level attestation
GET /attest/letterstory/chain— its full signed history
GET /attest/letterstory/casey-millstein.json— one attestation
GET /attest/letterstory/casey-millstein/chain— its full signed history

The same proof a buyer reads, at the same URL, in a form a machine can parse.