P2P, Blockchains and trustless messaging

Some interesting reading about techniques for peer to peer approaches to the IoT with potential applications to the Web of Things.

IBM paper: Empowering the edge: Practical insights on a decentralized Internet of Things, see
http://www.bic-innovation.com/knowledge/download/390/ <http://www.bic-innovation.com/knowledge/download/390/> 

Ethereum platform for decentralized applications, see  https://www.ethereum.org <https://www.ethereum.org/>. It defines a blockchain based virtual machine for digital contracts. A similar approach is Eris, see http://hplusmagazine.com/2014/06/17/eris-the-dawn-of-distributed-autonomous-organizations-and-the-future-of-governance/ <http://hplusmagazine.com/2014/06/17/eris-the-dawn-of-distributed-autonomous-organizations-and-the-future-of-governance/> 

Kademlia is a distributed hash table for decentralized peer-to-peer computer networks, see https://en.wikipedia.org/wiki/Kademlia <https://en.wikipedia.org/wiki/Kademlia>

Bitmessage is is a decentralized, encrypted, peer-to-peer, trustless communications protocol that can be used by one person to send encrypted messages to another person, or to multiple subscribers, see https://en.wikipedia.org/wiki/Bitmessage <https://en.wikipedia.org/wiki/Bitmessage>

Anyone interested in taking a closer look and commenting on the applicability to the Web of Things?  In particular where these techniques would be of high value, and an assessment of the downside compared to traditional techniques based upon protocols like HTTP and MQTT?

—
   Dave Raggett <dsr@w3.org <mailto:dsr@w3.org>>