[Retracted] Sports Injury Risk Assessment Based on Blockchain and Internet of Things

Table 1

Block structure of new area.

Attribute	Individual meaning
father_hash	Point to parent block (parentB1ock). Except for GenesisB1ock, each block has only one parent block.
Number	Serial number of the block. The number of a block is equal to its parent block number +1.
Merkel_root	The root of Merkel tree. Merkel tree is a kind of hash tree. Leaf node contains stored data or its hash value, middle node is the hash value of its two child nodes, and the top root node is composed of the hash value of its two child nodes.
Timestamp	The time when the block “should” be created. Determined by consensus algorithm, generally, it is either equal to parentB1ock. Time +10 s or equal to the current system time.