v2 is supposed to support user authentication. There are no plans to support that in v1.

Personally I hope they go with OAuth or something similarly recognized.

For now, you'll need to do your own user verification:

1. User enters his ID,
2. You provide a key for the user to add to their profile on SO.
3. User confirms profile has been modified.
4. You verify key and save ID.

Or something similar.

v2 is supposed to support user authentication. There are no plans to support that in v1 (the team has said).

For now, you'll need to do your own user verification:

1. User enters his ID,
2. You provide a key for the user to add to their profile on SO.
3. User confirms profile has been modified.
4. You verify key and save ID.

Or something similar.