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Update README.md with link to writeup #2

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I was thinking the same thing LOL.

I wish there were more details about otterlink since the author mentioned it.

One other question: why doesn't the author use b3sum instead of xxhsum because b3sum is much faster especially when dealing with much larger files. I just searched for benchmarks to prove that, and ran into fletcher4 as well but fletcher4 has risks of hash collisions so b3sum is still better.

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Fast block-level file diffs (e.g. for VM disk images) using CoW filesystem metadata

Check out the technical writeup [here](https://cognition.ai/blog/blockdiff).

## Usage

### File snapshots
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