A file today.
A check tomorrow.
Create a record of a file's SHA-256 digest and the time this server received it. Anyone with your record link and the original file can check for an exact match later.
Your file stays in your browser. Only its cryptographic digest is sent. No account or payment needed.
One useful fact. No magic claims.
Local SHA-256 hash
The file is hashed in your browser. A one-byte change produces a different digest. We do not receive the file itself.
Server-observed time
We save when our server received the digest in UTC. It is not an independent trusted timestamp or proof the file existed earlier.
Shareable check
Give someone the record link and the file through your own secure channel. They can hash the file locally to see whether it matches.
Know what the record can and cannot show.
Can a hash prove when a contract was signed?
No. Learn what a matching digest and a server time can actually establish.
How to keep a lease version record
Keep your final file and a separate record link so you can compare the exact version later.