Ouroboros consensus algorithm interview questions covering Cardano's Proof-of-Stake consensus mechanism. Q1: How does Ouroboros (Cardano) consensus work? Answer: Ouroboros is Cardano's Proof-of-Stake consensus algorithm. Sequence Diagram: sequenceDiagram participant Leader participant Node1 participant Node2 …
Read MorePaxos consensus algorithm interview questions covering the classic distributed consensus protocol. Q1: How does Paxos consensus work? Answer: Paxos is a consensus algorithm for distributed systems that ensures agreement among nodes even with failures. Sequence Diagram: sequenceDiagram participant Client participant …
Read MorePolkadot consensus algorithm interview questions covering Nominated Proof-of-Stake (NPoS) with BABE and GRANDPA. Q1: How does Polkadot (NPoS) consensus work? Answer: Polkadot uses Nominated Proof-of-Stake (NPoS) with BABE + GRANDPA. Sequence Diagram: sequenceDiagram participant Leader participant Validator1 participant …
Read MoreEasy-level Polkadot interview questions covering blockchain basics, Substrate, and parachains. Q1: What is Polkadot and how does it work? Answer: Polkadot is a heterogeneous multi-chain protocol. graph TB A[Polkadot] --> B[Relay Chain] A --> C[Parachains] A --> D[Parathreads] B --> E[Validators] B --> F[Collators] B …
Read MoreHard-level Polkadot interview questions covering advanced optimization and complex parachain design. Q1: How do you implement advanced runtime upgrades? Answer: Runtime Upgrades: 1pub struct CustomUpgrade; 2 3impl OnRuntimeUpgrade for CustomUpgrade { 4 fn on_runtime_upgrade() -> Weight { 5 // Migration logic 6 // …
Read MoreMedium-level Polkadot interview questions covering advanced Substrate development and parachain architecture. Q1: How do you implement custom consensus in Substrate? Answer: Custom Consensus: 1use sc_consensus::{BlockImport, BlockImportParams}; 2 3pub struct CustomBlockImport; 4 5impl BlockImport<Block> for …
Read MoreEasy-level Solana interview questions covering blockchain basics, programs, and development. Q1: What is Solana and how does it work? Answer: Solana is a high-performance blockchain designed for scalability. graph TB A[Solana] --> B[Proof of History<br/>PoH] A --> C[Tower BFT<br/>Consensus] A --> D[Gulf …
Read MoreHard-level Solana interview questions covering advanced optimization, security, and complex program design. Q1: How do you implement advanced account compression and state optimization? Answer: State Compression: 1// Use Merkle trees for state 2use merkle_tree::MerkleTree; 3 4pub struct CompressedState { 5 tree: …
Read MoreMedium-level Solana interview questions covering advanced program development, optimization, and architecture. Q1: How do you implement cross-program invocations (CPIs)? Answer: CPI Basics: 1use solana_program::{ 2 program::invoke, 3 account_info::AccountInfo, 4}; 5 6pub fn call_other_program( 7 program_id: &Pubkey, 8 …
Read MoreSolana Proof of History Consensus Interview Questions
Solana consensus algorithm interview questions covering Proof of History (PoH) combined with Proof of Stake. Q1: How does Solana Proof of History (PoH) consensus work? Answer: Solana uses a unique consensus mechanism combining Proof of History (PoH) with Proof of Stake (PoS). PoH provides a cryptographic timestamp for …
Read MoreTendermint consensus algorithm interview questions covering the Byzantine Fault Tolerant consensus used in Cosmos chains. Q1: How does Tendermint consensus work? Answer: Tendermint is a Byzantine Fault Tolerant consensus algorithm used in Cosmos chains. Sequence Diagram: sequenceDiagram participant Proposer participant …
Read MoreComprehensive Web3 and blockchain interview questions covering Ethereum, Solidity, DeFi, security, and advanced protocol design. Blockchain Fundamentals Core concepts every Web3 developer should know: Easy: Blockchain basics, Ethereum vs Bitcoin, smart contracts, gas, wallets, keys, ERC-20, NFTs, dApps, …
Read MoreEasy-level Web3 interview questions covering blockchain fundamentals, Ethereum, smart contracts, and decentralized applications. Q1: What is blockchain and how does it work? Answer: graph TB A[Blockchain] --> B[Distributed<br/>Ledger] A --> C[Immutable<br/>Records] A --> D[Cryptographic<br/>Hashing] A --> …
Read More