Paper vs Steel: Choosing a Primary Backup Medium
How humidity, legibility, and re-sealing requirements differ between laminated paper cards and engraved steel capsules.
Continue readingField Notes
Guides and observations on paper and steel backup storage, tamper-evident sealing, and custody logging from Utility Birch Line.
Articles drawn from our custody visits across Cheongju and Chungcheongbuk-do. Each note addresses a specific material, storage condition, or documentation decision—not generic security advice.
Reading Tamper-Evident Tape After Six Months
What lifted edges, colour shifts, and adhesive residue tell you during a quarterly seal inspection.
Continue reading
Splitting Backups Across Two Addresses in Korea
How to cross-reference log entries when paper lives in Cheongju and steel sits in a Daejeon family home.
Continue reading
Handwritten Custody Ledgers vs Printed Templates
Why we still bind blank pages instead of pre-filled forms for seed phrase storage records.
Continue reading