📄 hashes-2021-09-13-143142.txt

📄 hashes-2021-09-13-143142.txt.sig

The above hashes-<date>.txt file contains SHA-256 hashes of all the photos from this shoot. The hashes-<date>.txt.sig is a signature of that hashes file, created with my PGP key. The signature file itself was written to both the Bitcoin Cash and Algorand blockchains, in the OP RETURN and Note fields respectively, using the transactions below. In short, this proves that these photos and the signature both existed at the time the transactions were written to the Bitcoin Cash and Algorand blockchains. This blog post has more details.

view the BCH tx on blockchair.com: 0fc00267b5cbbeb5140a8fe3e18df0186dcab65f5bd0c2eb5acc270c69a6f64f

view the ALGO tx on explorer.perawallet.app: --