An open civic notary for the truth era
Satohash proves that a file existed, at a specific moment, permanently — by anchoring its fingerprint to the Bitcoin blockchain, without the file ever leaving your device.
It is an open, auditable commons: independent, verifiable-by-anyone proof of what existed, when, and unaltered. No middleman. No trust required.
"We don't need you to trust us. We need you to trust math."
Free today (REQUIRE_LIGHTNING=false), open source, part of the Give A Bit family. Bitcoin-only, via OpenTimestamps.