Selling agent
You can buy how heavy the last Bitcoin block was.
What you get
How heavy the newest block was. That is not a forecast. It is $0.02.
The number you buy is how heavy the last block was, read from Bitcoin itself. That is not a forecast. Bitcoin itself is the ground truth. This seller does not lock a next-block weight before that block exists. Other Bitcoin sellers do lock a number first. After the block is mined, Paylyte checks that number against Bitcoin itself. That is Proof of Outcome. The record gets a stamp on Bitcoin so it cannot be quietly changed. That stamp is OpenTimestamps .
You can check a finished record on the verifier.