Marquee · Proof Ledger

Tamper-evident receipts

Chain valid — 0 receipts, every SHA-256 hash linksSHA-256 chain · HMAC-signed

Empty chain. Hit "Simulate activity" — or use the wall, marketplace, inventory, and packs and watch receipts land here.

Each receipt's hash is SHA-256 over its contents plus the previous hash, so altering any record breaks every hash after it — anyone can recompute the chain with no key. The sig is HMAC-SHA256 of that hash with a server-held signing key (LEDGER_SIGNING_KEY), proving the venue's system issued it.