mathopt.org
Observed Aug 9, 2026, 22:47 UTC (5d ago). Every field below was attested with an Ed25519 signature at scan time.
mathopt.org is on the survey sweep, which works its way across the whole catalog rather than returning to one name on a schedule. Putting mathopt.org under watch moves it to the fast lane, where DomainDrift re-checks it about every 5 minutes and signs each reading, so a change becomes a dated event within minutes instead of waiting for the sweep to come round.
Watch mathopt.org Watching a domain needs a DRM3 account. The reading above stays free and public either way.
Amazon SES
Let's Encrypt
Google Search ConsoleDNS Records
A 1
23.20.63.167
MX 1
10mail.mathopt.org
TXT 2
google-site-verification=mwRP3Mj6yCbi0-AiJPt-C6WDoet6bMlkmB3g_pSREpgv=spf1 a mx ip4:23.20.63.167 include:amazonses.com ~all
NS 2
davina.ns.cloudflare.comdenver.ns.cloudflare.com
SOA 1
davina.ns.cloudflare.com dns.cloudflare.com
CAA 10
issue "comodoca.com"issue "digicert.com; cansignhttpexchanges=yes"issue "letsencrypt.org"issue "pki.goog; cansignhttpexchanges=yes"issue "ssl.com"issuewild "comodoca.com"issuewild "digicert.com; cansignhttpexchanges=yes"issuewild "letsencrypt.org"issuewild "pki.goog; cansignhttpexchanges=yes"issuewild "ssl.com"
DMARC_RECORDS 1
v=DMARC1; p=reject; rua=mailto:dmark@mathopt.org,mailto:dmarc_agg@vali.email;
TLS Certificates (3)
| Common Name | Issuer | Expires |
|---|---|---|
mathopt.org |
C=US, O=Let's Encrypt, CN=YR2 | Sat, 05 Sep 2026 12:56:06 +0000 |
YR2 |
C=US, O=ISRG, CN=Root YR | Sat, 02 Sep 2028 23:59:59 +0000 |
Root YR |
C=US, O=Internet Security Research Group, CN=ISRG Root X1 | Thu, 02 Sep 2032 23:59:59 +0000 |
Subdomains (1)
Signed at scan time. Check the math yourself. Every line above is part of one signed observation. Re-hash it and check the Ed25519 signature in your own browser; the only network request the check makes is for the published public keys.
Verify this receiptEd25519 Receipt
- Receipt ID
rcpt_c192bd0206af95db- Output Hash
5db4f25631d323089393edd8e1cb0950ddbf6bea8d66214dbf2efa01a5114d0b- Signature
ed25519:2277ae6c489338e962fe61a46ced8c771d183e8778bc5e6321083db7a18cebe503e88692e4fa6efcd7d328dd8de8faaac8d6c0fea7423a6257396076a81f2c03- Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9- Parent
(genesis)- Plane
- fast