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I'd say IOTA might fit your criteria, although it's still early stage.

I don't think bitcoin could integrate their tech since it's not a blockchain, but a DAG (what they call a tangle).

Interesting stuff.

I have been following IOTA for a while now and while concept of IOTA is very neat, it appears that the community/leadership surrounding it are in shambles. The network is not really working unless you run a full node, and even then if you send your IOTA to an address you have transferred IOTA out of you can lose them forever. These issues make me very nervous about the whole project.

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