0xffef42c63687fd6be179580b0b7e3c2f3932eb1b4b964cb16bfb005823396e9b

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.