I read this carefully, where does it say username is required?
Reply a number between 1 and 10 for a 0.001 BTC tip
January 08, 2015, 00:33:14
Reply with quote #1
Only members or above are qualified, please don't apply again if you ever received giveaway here or in our main thread:
https://bitcointalk.org/index.php?topic=868275.0See here:
All tipped except for justinetime and Spayse. Cannot find your usernames!
Next, please reply a number between 1 and 10 and I'll send you a link with 0.001BTC preloaded.
Only members or above.
Also, usually a BTC address or a site account is used for tipping. Here he didn't ask for any. But since he mentioned the main thread of his site, we assume he will tip on your SafeDICE account.