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Any distributed database with support for User roles/access will fulfill your requirements.

The distributed databases I have looked into have a user who grants roles/access to every other user. This means someone has to be trusted with full privileges. A solution where the access/role is baked into the software could be ideal.

You want the database to be its own admin?

Actually, I want no admin.

Maybe this might sound a little crazy, I am trying to build a system where arbitrary number of persons maintain nodes (I don't even need to know these persons) that have my data. The software managing my data should only allow me append and read from it.

This kind of database makes it impossible for me to alter data once appended.

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