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Guest post by David Gerard of RocknerdSpotify’s been on a bit of a spending spree lately, acquiring content identifiers Sonalytic and recommendations app MightyTV, and now Blockchain company Mediachain Labs.I specify “Blockchain” with a capital B and no article, because that’s the sure tell that there’s no evidence anyone involved has any idea how this thing is going to work or do anything.The problem Spotify [has] is that nobody knows who the hell owns a lot of the songs. Streaming produces a veritable firehose of data that looks like what publishers and record companies want — the usually-wrong idea that if you only had more data you could solve all your problems! — but is actually of questionable quality, and the collection societies are getting buried in it.The data is problematic enough that Spotify just settled one suit over this with a $30 million payment.I’m presuming that, despite the hype, Spotify don’t actually want Mediachain for blockchains, but for things like the attribution engine and the quest to get cleaned-up and useful data out of people, because there’s no way the Blockchain stuff can scale to workability in practice.The way Blockchain hype works is that advocates promise all sorts of unlikely outcomes — money directly deposited in artists’ accounts directly upon an iTunes purchase or Spotify play, transactions that occur “nearly instantaneously” (“in less than one second” — an unworkably short block time, but that’s the least of the idea’s problems) and directly, without intermediaries. All you need to do is clean up the data, and you get all the magical stuff!It’s not just music — across many industries, the main Blockchain promise is magic after full availability of properly cleaned-up data. The actual problem in every case is cleaning up the data at all. The proponents’ business goal is to become the organisation controlling the newly cleaned-up data, with a monopoly maintained by network effect. The barrier that such efforts founder on, over and over, is that no industry’s players want to create a new central octopus.Of course, none of the magical outcomes are feasible in the first place:- No single blockchain can possibly scale to the whole music industry. Spotify played a billion streams a day by mid-2015.
- Apart from the metadata itself being huge, there’s the encoded details of all the hundred-page contracts. And who will pay for the computing resources to execute all the smart contracts for each song played?
- “Where there’s a hit, there’s a writ.” You sue and win. How is the “immutable” blockchain corrected?
- What’s your security threat model? This one never seems to be mentioned, and we’re talking about real-world money here. How is your blockchain kept secure against hostile attackers, say, someone who has the money to bring a 51% attack against a Proof of Work secured chain? How will you clean up the mess after an attacker uses bugs in your smart contract language that they knew existed and you didn’t?

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