SHA-256 of: "ISG#<issue id>|<headline>|<publication date>" followed, for each notice in the issue in ascending id order, by "|" and "<TYPE>:<title>:<body>" joined with "||" (UTF-8).

RFC 3161 timestamp granted 2026-10-21T12:00:23Z (serial 0954a25e) by freetsa.org — download the DER token and verify: openssl ts -verify -digest fe863ed948637a282e8bf888b9d279c92c630adfb0a117471ac41ecc0cf2f01c -in issue-23.tsr -CAfile cacert.pem (CA: freetsa.org cacert.pem).

OpenTimestamps proof submitted to a public calendar — download the .ots proof; upgrade and verify with the ots client once a Bitcoin block confirms.

Wayback Machine capture: https://web.archive.org/web/20261021120126/https://internationalsacredgazette.org/archive/issue/23