0x9c9887ec56664711d6a34dfe66ca9018f09447443a0fafa483e0eb7f9fdd6f40

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.