> You realize we can go on github and setup a bitcoin network too, we call it BitcoinYC, our coins have the same properties of bitcoins, why would that have a value?
Miners will only mine the blockchain with the longest proof-of-work. They won't mine yours, as Bitcoin's preexisting blockchain is longer. This principle was explained in the Bitcoin paper and is the heart of what makes Bitcoin work. Miners can only use their electricity for one thing at a time, thus the competition to secure the underlying asset (energy) forces what might seem to be otherwise unrelated projects to in actuality compete against each other.
Change the word mining to computing, and it’s more intuitive.
A network of nodes compute stuff together, making data available across the network. It’s like asking why is a distributed network valuable.
During the process of computing, the network validates stuff about the data, guaranteeing it properties, so that people can rely on it to a certain degree when reading from and writing to it.
Miners will only mine the blockchain with the longest proof-of-work. They won't mine yours, as Bitcoin's preexisting blockchain is longer. This principle was explained in the Bitcoin paper and is the heart of what makes Bitcoin work. Miners can only use their electricity for one thing at a time, thus the competition to secure the underlying asset (energy) forces what might seem to be otherwise unrelated projects to in actuality compete against each other.