Whose blood is referenced in the name, Field of Blood, in Acts 1:18-19? (your opinion of what this verse actually says)

It's Judas' blood. And it's not just my opinion; it's what the text explicitly says. See previous answers for details.

Now this man acquired a field with his unrighteous wages. He fell headfirst and burst open in the middle, and all his insides spilled out.  This became known to all the residents of Jerusalem, so that in their own language that field is called Hakeldama (that is, Field of Blood).  Acts 1:18-19 (HCSB) Then Judas, His betrayer, seeing that He had been condemned, was full of remorse and returned the 30 pieces of silver to the chief priests and elders.  “I have sinned by betraying innocent blood,” he said. “What’s that to us?” they said. “See to it yourself!”  So he threw the silver into the sanctuary and departed. Then he went and hanged himself.  The chief priests took the silver and said, “It’s not lawful to put it into the temple treasury, since it is blood money.”  So they conferred together and bought the potter’s field with it as a burial place for foreigners.  Therefore that field has been called “Blood Field” to this day.  Then what was spoken through the prophet Jeremiah was fulfilled: They took the 30 pieces of silver, the price of Him whose price was set by the Israelites,  and they gave them for the potter’s field, as the Lord directed me.  Matthew 27:3-10 (HCSB) since the thirty pieces of silver were considered "blood money," the field was called "the field of blood" (Matt. 27:8). It was not Judas' blood that gave the field its name, for the Jews would not use as a sacred cemetery a place that had been defiled by a suicide. Judas hanged himself, and apparently the rope broke and his body (possibly already distended) burst open when it hit the ground. Warren Wiersbe, Bible Exposition Commentary – Be Dynamic (Acts 1-12) This name was attached to it because it was the price of blood and that is not inconsistent with Acts 1:18-19. Today potter's field carries the idea here started of burial place for strangers who have no where else to lie (eis taphen tois xenois), probably at first Jews from elsewhere dying in Jerusalem. In Acts 1:19 it is called Aceldama or place of blood (chorion haimatos) for the reason that Judas' blood was shed there, here because it was purchased by blood money. Both reasons could be true. Archibald Thomas Robertson, Word Pictures in the New Testament