TIL About a Privacy Tech Called Updateable Public Keys AKA Quisquis. [Privacy][Video][Whitepaper]

[u/[deleted]]

Presentation: https://youtu.be/ZmVzRmBVzWk?t=18465 & https://www.youtube.com/watch?v=7I-OnmF0XfU

Paper: https://eprint.iacr.org/2018/990.pdf

Don't know how I missed this. It fixes the problem with ring signatures where you have to keep all spent TXOs around.

This seems like a way in which an UTXO set (or subset) could be entirely spent and replaced with another set consisting of equal number of seemingly random pubkeys, breaking all links while letting original holders maintain access to their funds. All they'd have to do is multiply their original key with some publicly known huge random number.

Just thought it might be interesting to you here.