0xf71398a4ed6a6edd5ebac392384dddffc58bc1e8c192c4e1fba5e90d1b2d6f8e

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.