HashStamp
Cryptographic Proof of Existence
OpenTimestamps Integration Active
Prove your files existed
Free cryptographic timestamps anchored to Bitcoin. Your files never leave your device.
100% Private
Bitcoin Anchored
Free Forever
Drop a file to hash
or tap to browse files
Hashed locally - never uploaded
How it works
- 1Your file is hashed locally using SHA256 - it never leaves your device
- 2The hash is submitted to OpenTimestamps calendar servers (free)
- 3Within ~24 hours, the timestamp is anchored to the Bitcoin blockchain
- 4Download your .ots proof file to verify your document existed at that time