- 'Ethereum' → 'Whitepaper' → 'https://ethereum.org/en/whitepaper/' is correct, as this is the primary and official whitepaper associated with Ethereum.
- 'Bitcoin' → 'Whitepaper' → 'https://bitcoin.org/bitcoin.pdf' is correct, as bitcoin.org is an official group with significant and known ties to the Bitcoin network.
- Ethereum' → 'Whitepaper' → 'https://whitepaper.io/document/718/ethereum-whitepaper' is incorrect, as this is a URL associated to a site hosting a copy of the whitepaper.