I sent BTC to the same address on three different occasions. The first two times were successful. The third time (yesterday) the receiver claimed that he did not receive the BTC. It took over an hour until my wallet gave me confirmation that the transaction was successful. How can I independently verify that the receiver did in fact receive the 3rd transaction? Thx
Receiver address: 184wkr7Jxf6EM2ivFRh2Cy8iiwkCzuFTwV