Felix EngelmannFelix Engelmann and I sat down tonight and we used
libbitcoin. We have been able to produce the address from the test vector and exactly your intermediate results
a='8d6a8ecd8ee5e0042ad0cb56e3a971c760b5145c3917a8e7beaf0ed92d7a520c' B='024ce8e3b04ea205ff49f529950616c3db615b1e37753858cc60c1ce64d17e2ad8' S=$(bx ec-multiply $B $a) echo $S > 03f5bb84706ee366052471e6139e6a9a969d586e5fe6471a9b96c3d8caefe86fef s=$(bx sha256 'f5bb84706ee366052471e6139e6a9a969d586e5fe6471a9b96c3d8caefe86fef') echo $s > d24366e662da47c0cccca4cc2d2d817af54e4d21039c0cc4fc441624efe273f7 sG=$(bx ec-to-public $s) echo $sG > 0283850c6835576554261fbab5845a099638859528b2725455e6a48e7566415c02 B_prime=$(bx ec-add $B $s) echo $B_prime > 0344b4795e48df097bd87e6cf87a70e4f0c30b2d847b6e34cddde64af10296952d addr=$(bx ec-to-address -v 0 $B_prime) echo $addr > 141fi7TY3h936vRUKh1qfUZr8rSBuYbVBK
Note that our value for
0344b4795e48df097bd87e6cf87a70e4f0c30b2d847b6e34cddde64af10296952d as you suggested. Actually encoding it to a Bitcoin address seemed a little bit tricky as without passing
-v 0 it would use a testnet address. Maybe you have a similar problem while using Bitcoin core? I don't know the API though for transforming a pub key / ec point to an Adress in Bitcoin core out of my head.
Anyway I think you did everything correctly and you just did a mistake in encoding the P2PKH address.