Why isn't Witnet built on the Ethereum blockchain?
Source: https://witnet.io/about
The Witnet Protocol runs on its own blockchain with a native token called WIT.
Having its own blockchain guarantees that the fate of Witnet is not tied to any other Blockchain, making Witnet much more independent and smart contract platform agnostic.
Other projects rely heavily on ERC-20 tokens in the Ethereum blockchain to incentivize oracles to resolve tasks. This fact will hinder their viability until Ethereum’s scalability challenges are solved.
In addition, the main key of Witnet is the reputation system. Such a mechanism would be both difficult, and expensive to implement on other smart contract platforms. And finally and more important, mining rewards subsidize the data request costs at the initial stage of the protocol.
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