Who grants ebike-ready certifications for tires (aside from manufacturers)? I have tires with (among others) official-looking decals implying (with varying wording and symbology) that they are "ebike-ready" (EBR) and rated to speeds of either 25 km/h or 50 km/h. I recently wondered, "who certifies these?" I.e., is there an independent certification authority (e.g., UL or one of the many organic food certifiers), or can any bike-tire manufacturer just slap this on the sidewall {at will, with no external verification}?

So I did some websearch and ... got surprisingly little. I did find one good Medium post about ebike certifications generally, but it has nothing about tires other than a mention of ISO 5775, which (IIUC--which I might not!) only regulates tire and rim sizing.

Edit: Thanks to @Affe, I eventually found something that's almost, just tantalizingly close to what I want. The Dutch standardization org NEN publishes (though only behind a paywall) a standard (NTA 8776) for helmets for "speed pedelecs" (which AFAICS == ebikes). More importantly, they publish this table of NTA-8776-certified helmets (archived here) which not only includes the make and model of each NTA-8776-certified helmet, but also the Certifying Body ... which appear to be independent. (FWIW, the values in field=Certifying Body are in each current case one of


CSI
Telefication
Vias Institute


). So I'd be very interested to see similar data regarding standards, compliant products (per the standards setter--i.e., not the maker/vendor), and certifying bodies for {ebike, speed pedelec} tires. (FWIW, I searched for this on the NEN website but found nothing.) Until then, my guess is there are standards for ebike tires, but the tire maker self-certifies to the standard.
For the name brand tires that are certified 50km/hr there is an actual international standard that the tire manufacturer is certifying against.  These are tires that are built to the UNECE motor vehicle tire specifications instead of bicycle specifications.  

For example all Schwalbe tires (at least for 2019 product line) that bear their  "Energizer" badge printed on the sidewall are certified to that standard.

For tires that are recommended for 25km/hr it appears to be purely manufacturer's recommendation.