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One Trophy could be: "First output signed" And many more milestones on the road to the more advanced usages of the network: "First multisign/multispend", "First completed ANYONECANPAY transaction"
Would that be possible?
So the user would sign a message with the address used to do these actions, and send it to a "bitcoin trophy" website. Then parsing of the blockchain would pick out the events that awards a Trophy for that user.
How can anonymity be conserved, so that a user would feel safe to collect more Trophys?
The message could look like: This is my address and my username is trophyhunter at example.com, please detect my Achievements. and then the user would be required to send his signature to the website, it looks like this:
G7OdYRGmPFBiCsvqyUCQlYUAwdrTG56khvNbZ7TxHAUMmqJU6TxPJdO9CPh5HZOtKnDRr/dzSnWVuLQ9cxwsh1I=– Jonas Oestman – 2013-10-13T14:48:05.880