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 receiptEd25519 Receipt
- Receipt ID
3b7b57eb-6b4d-4c8e-b079-ebc9292363ba- Output Hash
7c5fe561158382eb75dc3aeaf21f22d9f9daa104857d5095a64927d7e2a7edd7- Signature
ed25519:98a5d854a8de38ccab10eefe56c0c4645cdcad207b2924332ebdb75b4d11b4ef6fd28c27e47dd8ffcb2ccd29fe02befbd94e2c15ba5ac82c739d03995a8e6a0e- Public Key
ed25519:d3f6015a95abdad7e8166ad80938a5885500170bb75f8cdb425b8fd2772bec29- Parent
(genesis)- Plane
- fast
DNS Records
A 4
18.160.46.9618.160.46.2318.160.46.7518.160.46.108
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=USDQ5N76BVCB5CXXBSZ34POROQMS=ms58383868anthropic-domain-verification-ewhe7h=S2BgAeCil3ayY972YJsaqRznMfacebook-domain-verification=qehn0rayh30a1mrjbmt6ncx7lf6evigoogle-site-verification=5P1KHg2sIon0NiYhjrIxuLk_EZtd2bdHOJwMh9DcyFcgoogle-site-verification=h-yRpYjInlbkB3Sngplfqbq70q0CYVvoJ-w1070hHOMgoogle-site-verification=kU898HQbWPBk88hCzxxput41Du008GyrmHuZ_0tu-XUij7237pjdbunduigm3aog31coapardot218812=cad18a59f84a76dac099a1090cfe14fb86bfda2f2f3b1049d3ca49550886ddb7v=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.orgns-2027.awsdns-61.co.ukns-358.awsdns-44.comns-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 Name | Issuer | Expires |
|---|---|---|
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.