I0328 09:51:54.537322 miner/worker.go:542] commit new work on block 645501 with 3 txs & 0 uncles. Took 7.0169ms
I0328 09:51:54.510653 core/blockchain.go:1042] imported 1 blocks,     1 txs (  2.461 Mg) in  19.615ms (125.473 Mg/s). #645500 [decf1899…]
I0328 09:51:49.199444 miner/worker.go:542] commit new work on block 645500 with 3 txs & 0 uncles. Took 10.9284ms
I0328 09:51:49.188250 core/blockchain.go:1042] imported 1 blocks,     0 txs (  0.000 Mg) in   8.887ms ( 0.000 Mg/s). #645499 [d7e75631…]
I0328 09:51:41.826702 miner/worker.go:542] commit new work on block 645499 with 2 txs & 0 uncles. Took 1.0329ms
I0328 09:51:41.825596 core/blockchain.go:1042] imported 1 blocks,     0 txs (  0.000 Mg) in   2.866ms ( 0.000 Mg/s). #645498 [4fde3f80…]
I0328 09:51:40.335148 miner/worker.go:542] commit new work on block 645498 with 2 txs & 0 uncles. Took 1.0338ms

https://ropsten.etherscan.io/address/0xf28dafbfeb41bf32869c9d498da0d651d0206ed4#mine

geth --testnet --rpc --rpcapi "db,eth,net,web3,personal" --mine --etherbase "0xf28dafbfeb41bf32869c9d498da0d651d0206ed4" --gasprice "1000000000" --bootnodes "enode://20c9ad97c081d63397d7b685a412227a40e23c8bdc6688c6f37e97cfbc22d2b4d1db1510d8f61e6a8866ad7f0e17c02b14182d37ea7c3c8b9c2683aeb6b733a1@52.169.14.227:30303,enode://6ce05930c72abc632c58e2e4324f7c7ea478cec0ed4fa2528982cf34483094e9cbc9216e7aa349691242576d552a2a56aaeae426c5303ded677ce455ba1acd9d@13.84.180.240:30303"