Block #21

block	#21 of 39 (chain of 40 blocks)
sealed at	2026-09-07T19:07:53.471Z
kind	seal
content	Demo video: Free verification
signed by	Stefania Overman (key 3391cebb120892c6)
block hash	`577330b89d10622a3ceb995c0b67713af8a045e1acf7aebba8a744b153cec923`
previous hash	`9895f721ec25ca7560e60c14de9bc9beabdcef3ae08ec8921f81da140a26d7dd`
public anchor	confirmed in Bitcoin block 966087, 966092, 966114 ✓ — statement · proof (.ots) · verify it yourself

This is the library’s own record; it lives on no third-party blockchain, by sealed covenant (no token, ever).

Verify it without trusting this page: download the raw chain and recompute every hash, or check the signed tip at /api/tip.

The public anchor stamps exactly (index, hash, sealedAt, and this page’s URL) into Bitcoin via OpenTimestamps — verify the proof with the open ots tool; no trust in this server needed. All anchors: /api/anchors.