usaco.guide

Observed Jul 25, 2026, 17:22 UTC (8d ago). Every field below was attested with an Ed25519 signature at scan time. Catalog observation, re-checked on rotation - watch it for 5-minute checks.

Verify this receipt yourself + Watch this domain

Up right now

Runs onCloudflare

Secured byGoogle Trust Services

Also usesGoogle Search Console

IPv6 · tranco

Every line above is a signed observation. Check the math at the bottom of the page.

INFRASTRUCTURE MAPwhat usaco.guide actually stands on - every host below is a signed observation

usaco.guide

A / AAAA

172.67.210.194104.21.35.142606:4700:3035::ac43:d2c22606:4700:3037::6815:230e

Cloudflareserves the site

miles.ns.cloudflare.comroxy.ns.cloudflare.com

cloudflare.comanswers its DNS

TLS

usaco.guide

Google Trust Servicesissued its certificate

DNS Records

A 2

172.67.210.194
104.21.35.14

AAAA 2

2606:4700:3035::ac43:d2c2
2606:4700:3037::6815:230e

TXT 2

google-site-verification=EEQ5P5Q0K5Buwx-G1Hb7mfW7cJbaWTv64aLdmak3cg4
google-site-verification=EediNHStqrEG4BOEkCBuSkDYk9yJkFbAeI_JjBl5bOc

NS 2

miles.ns.cloudflare.com
roxy.ns.cloudflare.com

SOA 1

miles.ns.cloudflare.com dns.cloudflare.com

TLS Certificates (3)

Common Name	Issuer	Expires
`usaco.guide`	C=US, O=Google Trust Services, CN=WE1	Sun, 13 Sep 2026 06:29:33 +0000
`WE1`	C=US, O=Google Trust Services LLC, CN=GTS Root R4	Tue, 20 Feb 2029 14:00:00 +0000
`GTS Root R4`	C=BE, O=GlobalSign nv-sa, 2.5.4.11=Root CA, CN=GlobalSign Root CA	Fri, 28 Jan 2028 00:00:42 +0000

Subdomains (0)

None observed.

The proof

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; nothing leaves your machine.

Verify this receipt

Put the receipt on your own site. A live badge showing what DomainDrift observes and signs for usaco.guide. It updates itself. It attests a signed observation - not that the site is safe.

<a href="https://domaindrift.io/t/usaco.guide">
  <img src="https://domaindrift.io/badge/usaco.guide.svg"
       width="300" height="64" alt="DomainDrift signed observations for usaco.guide">
</a>

Ed25519 Receipt

Receipt ID: rcpt_dce99952c40b40ae
Output Hash: 1deca6a49f84abc3298c9871b551521d7b389a24e2cbce3d5365d03fa7f2aa4e
Signature: ed25519:4797232de764ee97348a3c09516c8d3951dbe097b907c0799dc0f61107e46aa0d35f4fe3f9dbf206881d70fdf08216d26d775de1e42050fd7972e07a74f72b0d
Public Key: ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent: (genesis)
Plane: fast

Verify this in your browser

Permalink: https://domaindrift.io/t/usaco.guide