There are some tools to index the DHT, although it's limited. But that's more of a result of the regulatory environment and that it's hard to have decentralize

There are some tools to index the DHT, although it's limited. But that's more of a result of the regulatory environment and that it's hard to have decentralized search that works well. There is a spec for updatable torrents, I believe it embeds a pubkey and the creator can announce an update by broadcasting a signed message. But it's not widely used.