Bitcoin consensus algorithm interview questions covering Proof-of-Work (PoW) and Nakamoto consensus. Q1: How does Bitcoin (Nakamoto) consensus work? Answer: Bitcoin uses Proof-of-Work (PoW) consensus, also known as Nakamoto consensus. Sequence Diagram: Overall Flow Diagram: Individual Node Decision Diagram: Bitcoin …

Byzantine Fault Tolerance (BFT) consensus algorithm interview questions covering distributed systems that handle arbitrary failures. Q1: How does Byzantine Fault Tolerance (BFT) work? Answer: Byzantine Fault Tolerance handles arbitrary failures, including malicious behavior. Sequence Diagram: Overall Flow Diagram: …

Easy-level Cardano interview questions covering blockchain basics, Plutus, and development. Q1: What is Cardano and how does it work? Answer: Cardano is a proof-of-stake blockchain platform. Key Features: Ouroboros: Proof-of-Stake consensus Plutus: Smart contract language Formal Verification: Mathematically verified …

Hard-level Cardano interview questions covering advanced optimization and formal verification. Q1: How do you formally verify Plutus contracts? Answer: Formal Verification: Use Agda/Coq for proofs Prove contract properties Ensure correctness Mathematical guarantees Q2: How do you optimize for Cardano's execution model? …

Medium-level Cardano interview questions covering advanced Plutus development and optimization. Q1: How do you optimize Plutus contract execution costs? Answer: Optimization: Minimize on-chain code Use off-chain code when possible Optimize datum/redeemer size Batch operations Q2: How do you implement complex state …

Consensus algorithm comparison and general implementation interview questions. Q1: Compare different consensus algorithms. Answer: Comparison Table: Algorithm Type Finality Block Time Energy Fault Tolerance Paxos Classic Immediate N/A Low (n-1)/2 failures BFT Byzantine Immediate Fast Low f Byzantine (n=3f+1) Tendermint …

Easy-level Cosmos chain operation interview questions covering chain operations, algorithms, keys, validators, and modules. Q1: What are the key components of a Cosmos chain? Answer: Chain Components: Key Components: Tendermint Core: Consensus and networking Byzantine Fault Tolerant (BFT) consensus P2P networking Block …

Hard-level Cosmos chain operation questions covering advanced algorithms, performance optimization, and complex validator management. Q1: How do you implement advanced consensus optimizations and reduce latency? Answer: Optimistic Execution: 1type OptimisticExecutor struct { 2 pendingTxs map[string]*PendingTx 3 …

Medium-level Cosmos chain operation questions covering advanced chain operations, consensus algorithms, and validator management. Q1: How does the Tendermint consensus algorithm ensure safety and liveness? Answer: Safety Properties: Validity: Only valid blocks are committed Agreement: All honest validators commit same …

Easy-level Cosmos SDK interview questions covering chain code, SDK basics, and Ignite CLI. Q1: What is Cosmos SDK and how does it work? Answer: Cosmos SDK is a framework for building blockchain applications in Go. It provides modular components that developers can combine to create custom blockchains. Key Components: …

Hard-level Cosmos SDK interview questions covering advanced SDK internals, performance optimization, and complex module design. Q1: How do you implement a custom ABCI application with advanced state management? Answer: Custom BaseApp: 1package app 2 3import ( 4 "github.com/cosmos/cosmos-sdk/baseapp" 5 …

Medium-level Cosmos SDK interview questions covering advanced module development, SDK internals, and Ignite customization. Q1: How do you implement custom state transitions and state machines in a module? Answer: State Machine Pattern: 1package keeper 2 3import ( 4 sdk "github.com/cosmos/cosmos-sdk/types" 5) 6 …

Ethereum Proof-of-Stake consensus algorithm interview questions covering Casper FFG and LMD GHOST. Q1: How does Ethereum consensus work (Proof-of-Stake)? Answer: Ethereum 2.0 uses Proof-of-Stake consensus (Casper FFG + LMD GHOST). Sequence Diagram: Overall Flow Diagram: Individual Node Decision Diagram: Ethereum PoS …