.........is a cryptocurrency that works on permissionless distributed ledger and can be mined while ............ is centralized and permission required to become a node.

Question

BlackTom AI · Accepted Answer

Bitcoin is permissionless and mined: it uses a proof-of-work (PoW) consensus where anyone can run a full node and participate in mining to create new blocks and earn BTC. Permissionless means no central authority must approve participation; the network is open, decentralized, and miners compete using computational work to validate transactions and secure the ledger.

Ripple (XRP) is centralized and permissioned: XRP tokens were pre-mined (created at inception) and the Ripple network relies on a consensus protocol using a set of validators. Many validators are operated or endorsed by Ripple Labs, and becoming an authoritative validator typically requires permission or trust relationships. Because the supply is pre-issued and block creation is not performed by open mining, Ripple is characterized as more centralized and permissioned than Bitcoin.

Step-by-step reasoning:
1. Define permissionless vs permissioned: permissionless — any participant can run a node/miner; permissioned — node/validator participation is restricted or governed by a central authority.
2. Check Bitcoin: open participation, PoW mining, new issuance via miners — fits “permissionless” and “can be mined.”
3. Check Ripple: XRP pre-mined, consensus via designated validators, Ripple Labs exerts control — fits “centralized” and “permission required to become a node/validator.”
4. Match the fill-in-the-blanks: first blank = Bitcoin; second blank = Ripple.

Why other choices are incorrect (brief):
- Ripple, Bitcoin: reverses roles; Ripple is not the permissionless, minable currency.
- Ethereum, Bitcoin: Ethereum (historically permissionless and minable pre-Merge) does not make Bitcoin centralized; order wrong.
- Ripple, Ethereum: Ripple is not permissionless/mined; Ethereum is not the centralized permissioned system described.
- Bitcoin, Ethereum: Ethereum (especially post-Merge) is not a centralized, permission-required node system.

Therefore the correct answer is Bitcoin, Ripple, which matches the provided answer.

.........is a cryptocurrency that works on permissionless distributed ledger and can be mined while ............ is centralized and permission required to become a node.单项选择题

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