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Distributed Ledger Platforms may be Getting All the Hype but the architecture of Bitcoin is more sophisticated than many people realise. I presented an update on the world of cryptocurrencies to an engaged and well-informed audience in the library of the Royal College of Physicians. Systems like Ripple, Hyperledger and Eris are broadly in this world, I think. The security model of these systems is based on knowing who the actors are: if somebody misbehaves, we can punish them because we know who they are!

Bitcoin and Ethereum are broadly in this space, I think. But this makes intuitive sense.

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If your platform is concerned with real-world assets and agreements then you necessarily need some concept of identity who are the issuers? Different design goals, different implementations. And the value of such systems to banks, corporations or individuals is, ultimately, an empirical question. I imagine will be the year where we discover many of the answers. But I went further in my talk. I observed that these two worlds also differ in one other respect: the Bitcoin-like systems could be disruptive to existing institutions if they gained widespread adoption, whereas Ripple-like systems seem, to me, to be far more closely aligned to how things work today and are, perhaps, a source of incremental innovation.

If this observation is correct, then firms looking at this space probably need to assess the technologies through different lenses. And to answer the last question, one must be sure to really understand what the system under analysis really is! For me, it is a mistake to think about Bitcoin solely as a currency. Within the Bitcoin community, this is well-known, of course.

I wrote a piece last year offering an intuition for how Bitcoin works, in terms of land.

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So you can think of the current state of the Bitcoin system as being a huge pool of UTXOs: all the payments that have been received by Bitcoin users that they have not yet spent:. And each UTXO has an identifier the transaction it appeared in and its position in the list of outputs of that transaction and a value: how many Bitcoins are represented by that UTXO. But what people often miss is that these UTXOs are actually tiny little computer programs that live on the ledger, control access to bitcoins and run in response to specific incoming events.

Smart Contracts , if you will. Your wallet software writes a little computer program for you and then sends it into the bitcoin network. If you can make this second program run successfully, you get to spend the money. So what are these little programs? So this, seemingly complex model, is just a way to ensure that the only person who can spend money at address 1abcde… is the person who knows the private key… exactly as we would want. And this is how your payment is modelled in the system. In this way, you can pay different people or send change back to yourself.

And, in this way, the value has been passed from you to them. You have, in effect, paid them that money since the funds are now under their control. In this diagram, the funds you controlled have now been split between two new recipients. Only they can spend those funds.


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So what does this have to do with smart contracts? The key is that the model I outlined above is quite generic.

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However, the reality is that the capabilities of the platform are actually quite constrained — and I think this explains a lot of the interest in other platforms, such as Ethereum. But I think that would be a mistake. All the systems are capable of representing off-system assets. The real difference is do we require that parties be known and trusted to form consensus. The distinction is important because really what you are asking about — as I believe you have previously mentioned — is what is the threat model?