problems.ru

Observed Aug 12, 2026, 04:59 UTC (23d ago). Every field below was attested with an Ed25519 signature at scan time.

This reading of problems.ru was taken 23d ago

problems.ru is on the survey sweep, which works its way across the whole catalog rather than returning to one name on a schedule. Putting problems.ru 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 problems.ru Watching a domain needs a DRM3 account. The reading above stays free and public either way.
Up right now
Runs onNon-State Educational Institution _Moscow Center for Continuous Mathematical Education_
Secured byLet's Encrypt
Registered withRU-CENTER-RU
DNSSEC on · 2 subdomains · tranco
Every line above is a signed observation. Check the math at the bottom of the page.
DRIFT

Steady. No change on record for problems.ru in the last day; this reading matches the one before it. The steady record is signed like every other reading. Watch it to catch the next move the moment it lands.

SIGNED-OUT VIEW Provider names, posture and counts are shown. The record values - every DNS answer, each subdomain hostname, raw TXT, IPs, cert names and WHOIS - are the product. Sign in for the full signed record, or use the API with a key.

DNS records 7

A1NS3MX1TXT1SOA1

TLS certificates 4

Issued byLet's Encrypt
ExpiresFri, 28 Au (-8d)
Certificate nameswithheld

Subdomains 1

1 subdomain hostname observed and signed - the list itself is part of the paid record.

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; the only network request the check makes is for the published public keys.

Verify this receipt
Ed25519 receiptthe raw cryptographic proof
Receipt ID
rcpt_813b6cdc5cb2a6b7
Output Hash
7c565b204016a8c43b34bb52bbdcddcbdcfb84fd4f55cc87a565898ab9ecdebb
Signature
ed25519:fa0e8b29cb6adf6e738cab731d743aade4493d1c21ffa182d782ef2185b3ae2738606bb2fb1d224ca13816b07861da48057113cd7d47f2826f4f3a6fadc43d0a
Public Key
ed25519:4859bb613d650e12dd7478cc307c73a8712fabc115a9dc59f65534ed3c09a8f9
Parent
(genesis)
Plane
fast
CONTINUOUS INTERNET TELEMETRY24H DRIFT4,978 material changesacross 2,979 domains · last 24h · -24,859 vs yesterdayROTATION58 domains moved DNS from magpiedns.com to koaladns.com, 54 moved backa rotation loop, not a migration · 24hNOW597 curated domains not reachablelast probe, steadySITE ERRORS17,424 sites serving errorslast probe · 5xx / 404 / TLSBOT DEFENSEbot defense observed on 79,489 sites429 rate-limit / 403 bot-block, a posture signal