# verae-tree-node External tree-node role: Bloom-filtered WORM store for Merkle **leaf** receipts. When Zapier submits a **batch**, middleware builds a Merkle tree of item SHA-256s, seals **only the root** on `api.veraetime.net`, and puts each leaf proof on a sharded tree node. A later lookup of a leaf that is not on the main chain fans out `verae.archive.query` with `kinds: ["tree"]`. Nodes that do not hold the leaf send nothing. Clone: `ssh://git@git.georgelambert.org:2223/marchon/verae-tree-node.git`