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The "Blockchain" technology is gonna become crucial in the future of AI and Deepfakes.
Since videos, and especially still images can be faked. They would be treated just like witness testimonies, evidence that can be falsified.
What I think will happen is that people would have to use live internet connection to verify a video.
So what happens is that whenever a video is recorded, there will be a "blockchain verify" feature in the camera settings, when enabled either the video feed or the hash of the packets of video data is sent to a blockchain network where it gets timestamped and stored permanently on the blockchain.
The network would consist of various nodes that ideally aren't government run. Think like the ACLU, EFF, or Journalists, or people who independently want to join the network. Each would run their own node independently.
So any time theres suspicion that a video may be faked, the courts can just ask the network to send their own copy of the blockchain, if theres a consensus, then the video can be proven to have been created at the time that is timestamped. So there's no way of creating a fake video evidence after an incident since you wont have the timestamp on the blockchain.
who pays to maintain the network? This is not a cryptocurrency, whoever does the mining needs to be paid for their spent resources, and it won't happen automatically
That's a good point, people make nodes because the incentive helps make sure there are enough servers on the network to keep it secure.
However, back in the days before blockchain we had SETI. So a case could be made that people will volunteer resources for something that mutually benefits them. Protecting ourselves from doctored media and deepfakes would be a pretty good incentive.
Then again, there are a lot of different cryptos tied to tasks already - like using phones as nodes in a mesh network, using a decentralized search engine, learning about crypto itself, etc. If blockchain turned out to be a good way to verify media, there could be a pay off for joining the distributed ledger.