not strange as i read the tittle of this post,this is just a unique transaction,this is unique because i never see transaction with so many zero number inside.
I believe the string:
000000000000000000c6de332035e49f80293748b1b4d4931fde1d5d4978a83a
is the solution to the "math problem" (hash) to win the block. Note large number of leading "zeros", 17 or 18. It's a very hard math problem to solve with 17 or 18 leading zeros. That's why mining uses so many ASIC computers, a tough problem. Every 10 minutes.