Just to be clear, Telehash is a protocol, not an application. The bulk of the documentation is on Github, and so far it's mostly for people implementing the protocol in different languages.

There's no blockchain involved in Telehash. It accomodates various cipher sets, including one suitable for ultra low power devices (there's a partially working implementation for Arduino). And you're correct, it isn't really aimed at enabling anything like trusting a URL from a television commercial.

Telehash is conservative in the sense that it solves useful problems, even within the current DNS infrastructure. No one's currently doing this, but you could easily map a DNS name to a Telehash address. But it also offers global resilience to partitioning, because the logical mesh can operate on any lower level network transport.

I like the multiple notary model of Convergence, but I think any of these trust models still need to separate the "human memorable names" component.