Blockchain performs bitcoin transactions under the consensus protocols and confirms them, store and secure them, this data is open and everyone connected can have access through their own device but cannot alter them, bitcoin price is determined by the rate of the statistics data recieved from the supply and demand and we got this also on the blockchain when you extract the data from every mined block reward by miners and the level of potential bitcoin holders with daily performing transactions, so blockchain is not the direct indication for bitcoin price but can give relevant information required to obtain a statistics for that.