0x53137f48c750d6a221a3002adfa634bb2d620dfb03bc5ee7b20255467ddd2a6e

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.