0x457c3a487a0671525b55cd5a7ed1568185bc1271f5b23ad3572fc4d0ac42ed5f

How to verify this batch yourself

Take any stamp's content hash, walk the merkle proof in its certificate to recompute the root, then call timestamps(root) on the BA Stamper contract on any Polygon full node. The block timestamp returned is the on-chain proof — no trust in BA Stamp required.