Anchor a file's SHA-256 fingerprint to Bitcoin. The file never leaves the device.
Free
One server, in security & testing. Anchor a file's SHA-256 fingerprint to Bitcoin. The file never leaves the device.
Security & Testing
Anchor a file's SHA-256 fingerprint to Bitcoin. The file never leaves the device.
The rest either hold an API key issued by the publisher or ask for nothing.
Listed without a verification tick. Read the listing before installing.