Card · vCard 4.0 · receipt on BSV

Ryan Wold
Founder, Civic Studio LLC

Builds feedback systems inside institutions. Commissioner, City of Vacaville Parks & Recreation Commission.

Vacaville, CA
ryanwold.net Receipt pending
Receipt
issued
2026-09-25 19:49:03 UTC
document
ryan-wold/20260925T194903Z.vcf
sha-256
4a23a44faac8b619e5805f7e3023c96184280ae782d5ea64bcc56f6092d10645
tx
not yet on the ledger
Not yet checked.
Add to contacts

A card with three entries

This card is a plain vCard, the format your phone's contacts app already reads. What's new is the receipt on the back.

  1. My record. Every version I issue is kept byte-for-byte and never rewritten.
  2. Your copy. Whatever you download is yours. You can check it against my record without asking me.
  3. The receipt. A transaction on the BSV ledger carries the card's fingerprint (its SHA-256), not the card. It proves this exact card existed, unaltered, by a certain block.

This is Ian Grigg's triple-entry accounting applied to a business card. Two parties' records, plus a third that neither can quietly edit.

Your contact details aren't on the public card, and nothing personal is on the ledger. You don't need a wallet to read or check it.

Check a copy you hold

Choose a .vcf you downloaded earlier. It's hashed in your browser and never uploaded.

Check it without this page

curl -s https://ryanwold.net/ryan-wold/20260925T194903Z.vcf | shasum -a 256
# expect 4a23a44faac8b619e5805f7e3023c96184280ae782d5ea64bcc56f6092d10645

Receipts follow a small, readable format: receipts/v0. The full ledger of versions is at ryan-wold/receipts.

Versions