On bitbucket.org the voted solution wouldn't work. Instead, when using headers (with ##), 

it is possible to reference them as anchors by prefixing them 

as #markdown-header-my-header-name, where #markdown-header- is an implicit 

prefix generated by the renderer, and the rest is the lower-cased 

header title with dashes replacing spaces.

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Example

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    ## My paragraph title

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will produce an implicit anchor like this

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    #markdown-header-my-paragraph-title

The whole URL before each anchor reference is optional, i.e.

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    [Some text](#markdown-header-my-paragraph-title)

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is equivalent of

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    [Some text](https://bitbucket.org/some_project/some_page#markdown-header-my-paragraph-title) 

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provided that they are in the same page.

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