OBOLPrivacy notice
You probably got here from a "Privacy" link in a verification box on someone's website. This page explains exactly what that box does.
What happens when you verify
Your browser asks this service for a set of maths puzzles, solves them (this takes a second or two of processor time), and sends the answers back. If the answers are right, the website you're on receives a one-time code proving that the work was done. That's all.
What we collect
| Data | Used for | Kept |
|---|---|---|
| Your IP address | Counting how many puzzles your network asked for recently, so floods can be slowed down. It is reduced to your network (the full IPv4 address, or the first half of an IPv6 address), then replaced by a keyed hash. The key exists only in memory and changes every 24 hours. | Only the hash, in memory, for up to 10 minutes after your last request. Never written to disk or logs. |
| The website's address (Origin) | Checking the verification box is being used on the site it belongs to. | Inside the one-time code until it expires (minutes). |
| Puzzle and code identifiers | Making sure each puzzle and code can be used only once. | Until they expire (minutes). |
| Daily totals per website | Showing the site owner how many verifications passed or failed. | Counts only — no information about you. |
What we don't do
- No cookies, local storage or any other storage in your browser.
- No fingerprinting: we don't read your screen size, fonts, plugins, graphics card, mouse movements or typing.
- No third parties: the box and its code come only from this service. Nothing is shared or sold.
- No profiles: nothing we keep can be linked to you, or between websites, or from one day to the next.
- No logs of IP addresses, browsers or pages visited.
Legal basis
The website using this box does so to protect its forms against automated abuse (legitimate interest, GDPR Art. 6(1)(f)). Because nothing is stored on your device, no consent banner is needed for it under the ePrivacy rules. Questions about the website itself should go to that website's operator; questions about this service go to its operator.