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Blockchain Theory
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In finance banks are exposed to cyber attacks and to avoid loss of data. The application of blockchain technology can be applied. The most attack the bank is vulnerable to os the ransomeware attack Where the computer used to store the data is been locked out and can't be accessed. The blockchain can store the data and is not prune to such attacks. And also since the data is not mutable on the blockchain and can be retrieved at any time i think it's good to go.

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In the matter of privacy, one good application of Blockchain technology would be in copyright of images/videos, and selling and sharing images/videos of other people, not only in the sense of protecting your content with Copyright Protection (e.g. Blockai) but even if someone takes a picture/video of someone illegally (e.g. paparazzi). The system could be arranged so that when someone takes a picture/video of someone and uploads it or sells it to an entity (e.g. magazine), the image/video is checked to see whether it has an identifier yet and a owner. Additionally, it should be checked if there's an agreement between the person exposed in the picture (e.g. through AI recognition) and the seller (e.g. paparazzi photographer). If no such information exists, then further investigation could be done and the person appearing in the image would be contacted to state their agreement/disagreement towards the publication/existence of the image/video.

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This challenge here is an outstanding one And with this solution rate of impersonation would reduce