Proof of existence

Verify against Bitcoin

Paste a slug. Drop a proof bundle. Either way, your browser walks the proof against a real Bitcoin block. The server is not trusted — it only serves bytes.

sealed · awaiting Bitcoin confirmation

slug: building-in-public
preimage: building-in-public:5:1776432851579
content hash: —
bitcoin block: #—
sealed at: 2026-04-17T13:34:11.579Z
rendered: 2026-08-27T05:41:38.222Z

click ≡ paste ≡ curl — same bytes:

curl -s 'https://a.getsven.com/api/verify-bundle/building-in-public'

The page above and this command return byte-identical JSON. The verification math runs in your browser — the server only serves bytes.

Verifies via the public Blockstream block-header API (read-only). The RFC 3161 chain is signed server-side at seal time and surfaced via GET /api/trust-verify/building-in-public; the OpenTimestamps proof is re-walked here in your browser. Both bundles are downloadable as raw bytes via GET /api/audit-download/building-in-public?type=ots|tsr|bundle.