Drop a file here, or click to choose
Hash is computed locally. Nothing leaves your browser.
or paste a hex digest
Drop files here (2-1024), or click to choose
Each file is hashed locally. File bytes never leave your browser - only the batch's Merkle root is sent to the timestamp authority.
or paste hex digests, one per line
Choose authorities
Select at least two independent authorities. RFC 4998 recommends redundancy: if one authority is later unavailable, the other still verifies.