0xa9cf0c7bfe7cb5264dad82c8ff33ee6f64b12b91c4e866fb6371ef7e521a8dfb

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.