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You might consider building on top of something like ShareJS[1]'s JSON OT types rather than reinventing your collaboration substrate :)

[1]: https://github.com/share/sharejs

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I am aware of those, but consciously chose not to use them. A hierarchical document model, as opposed to their linear one, has a lot of advantages, and OT is a pain to extend. See also http://marijnhaverbeke.nl/blog/collaborative-editing.html

The JSON data type in ShareJS is not linear, though that said implementing rich text on top of it is still an open problem.

Full disclosure: I wrote the JSON data type in ShareJS :)

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