BGP leaks and cryptocurrencies

The broad definition of a BGP leak would be IP space that is announced by somebody not allowed by the owner of the space. When a transit provider picks up Cloudflare’s announcement of 1.1.1.0/24 and announces it to the Internet, we allow them to do so. They are also verifying using the RIR information that only Cloudflare can announce it to them.

Source: cloudflare.com