How can I prove that some data came from my app?
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I have a distributed application that sends and receives data from a specific service on the Internet. When a node receives data, sometimes it needs to validate that that data is correlated with data it or another node previously sent. The value also needs to be unique enough so that I can practically expect never to generate identical values within 24 hours.

In the current implementation I have been using a custom header containing a value of `uuid.uuid1()`. I can easily validate that that value comes from the one single node running by comparing the received uuid to uuid.getnode(), but this implementation was written before we had a requirement that this app should be multi-node.

I still think that some `uuid` version is the right answer, but I can't seem to figure out how to validate an incoming uuid value.

    >>> received = uuid.uuid5(uuid.NAMESPACE_URL, 'http://example.org')
    >>> received
    UUID('c57c6902-3774-5f11-80e5-cf09f92b03ac')

Is there some way to validate that `received` was generated with 'http://example.org'?

1. Is uuid the right approach at all? If not, what is?
2. If so, should I even be using uuid5 here?
