openstax.org

Observed 2026-06-13T12:16:06.753Z (just now). Every field below was attested with an Ed25519 signature at scan time.

Don't trust this page — check the math. Verification runs entirely in your browser. Nothing leaves your machine.

Verify this receipt

Ed25519 Receipt

Receipt ID
3b7b57eb-6b4d-4c8e-b079-ebc9292363ba
Output Hash
7c5fe561158382eb75dc3aeaf21f22d9f9daa104857d5095a64927d7e2a7edd7
Signature
ed25519:98a5d854a8de38ccab10eefe56c0c4645cdcad207b2924332ebdb75b4d11b4ef6fd28c27e47dd8ffcb2ccd29fe02befbd94e2c15ba5ac82c739d03995a8e6a0e
Public Key
ed25519:d3f6015a95abdad7e8166ad80938a5885500170bb75f8cdb425b8fd2772bec29
Parent
(genesis)
Plane
fast
Verify this in your browser

DNS Records

A 4

  • 18.160.46.96
  • 18.160.46.23
  • 18.160.46.75
  • 18.160.46.108

MX 7

  • {"priority":10,"exchange":"aspmx.l.google.com"}
  • {"priority":20,"exchange":"alt1.aspmx.l.google.com"}
  • {"priority":20,"exchange":"alt2.aspmx.l.google.com"}
  • {"priority":30,"exchange":"aspmx2.googlemail.com"}
  • {"priority":30,"exchange":"aspmx3.googlemail.com"}
  • {"priority":30,"exchange":"aspmx4.googlemail.com"}
  • {"priority":30,"exchange":"aspmx5.googlemail.com"}

TXT 12

  • 1password-site-verification=USDQ5N76BVCB5CXXBSZ34POROQ
  • MS=ms58383868
  • anthropic-domain-verification-ewhe7h=S2BgAeCil3ayY972YJsaqRznM
  • facebook-domain-verification=qehn0rayh30a1mrjbmt6ncx7lf6evi
  • google-site-verification=5P1KHg2sIon0NiYhjrIxuLk_EZtd2bdHOJwMh9DcyFc
  • google-site-verification=h-yRpYjInlbkB3Sngplfqbq70q0CYVvoJ-w1070hHOM
  • google-site-verification=kU898HQbWPBk88hCzxxput41Du008GyrmHuZ_0tu-XU
  • ij7237pjdbunduigm3aog31coa
  • pardot218812=cad18a59f84a76dac099a1090cfe14fb86bfda2f2f3b1049d3ca49550886ddb7
  • v=spf1 include:_spf.google.com include:amazonses.com include:spf1.formassembly.com include:_spf.salesforce.com include:aspmx.pardot.com ~all

NS 4

  • ns-1195.awsdns-21.org
  • ns-2027.awsdns-61.co.uk
  • ns-358.awsdns-44.com
  • ns-602.awsdns-11.net

SOA 1

  • {"mname":"ns-2027.awsdns-61.co.uk","rname":"awsdns-hostmaster.amazon.com","serial":1,"refresh":7200,"retry":900,"expire":1209600,"minimum":86400}

TLS Certificates (3)

Common NameIssuerExpires
openstax.org C=US, O=Amazon, CN=Amazon RSA 2048 M04 Tue, 10 Nov 2026 23:59:59 +0000
Amazon RSA 2048 M04 C=US, O=Amazon, CN=Amazon Root CA 1 Fri, 23 Aug 2030 22:26:35 +0000
Amazon Root CA 1 C=US, ST=Arizona, L=Scottsdale, O=Starfield Technologies, Inc., CN=Starfield Services Root Certificate Authority - G2 Thu, 31 Dec 2037 01:00:00 +0000

Subdomains (0)

None observed.