Recent changes to Bitcoin made the method I'm using to timestamp the data on the blockchain somewhat problematic [1], but I'll be working on an update once I release another Bitcoin-related project I'm currently working on (hopefully in the coming days).
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I also developed a similar project:
https://www.btproof.com/ https://news.ycombinator.com/item?id=5790382
Recent changes to Bitcoin made the method I'm using to timestamp the data on the blockchain somewhat problematic [1], but I'll be working on an update once I release another Bitcoin-related project I'm currently working on (hopefully in the coming days).
[1] https://github.com/shesek/btproof/issues/1