0x0c028d3e19801eb81331ddb60c5d909a56147e49f0ee403bfd642a9f388d5e4c

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.