The Ledger
Every ad ever placed on the Blockchain Billboard, newest first. Each entry is locked to the one before it with a fingerprint, so no ad can be quietly changed or removed.
–entries on the chain
–paid by brands
–on the billboard now
Checking…verifying every entry in your browser
How can I check this myself?
Every entry's fingerprint (its hash) is made from everything in it — the brand, tagline, link, color, logo, price and time — plus the fingerprint of the entry before it. Change one letter anywhere and that fingerprint changes, which breaks the link to every entry after it.
Your browser just recalculated every fingerprint on this page from scratch and compared them. A green check means the entry is exactly as it was when it was paid for.
Developers can read the raw data at /ledger.json. Each hash is sha256 of the fields joined by new lines, in the order listed there.