I sent bitcoins to a user's wallet 2 days ago. Below is the transaction id: 9031b7d71ac55d2982b4451d3a0ec9ec1f80575a07afb5fe0d1a29eed5aa7841
And the wallet address: 1DDfbQNfm7UGWM4jp4CxJF631axDCafSD4
However, I was told that the bitcoin had not showed up in his wallet although the transaction has been confirmed.
May I know what may be the issue?