Blockchain at TU München

Flashcards and summaries for Blockchain at the TU München

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Study with flashcards and summaries for the course Blockchain at the TU München

Exemplary flashcards for Blockchain at the TU München on StudySmarter:

Which different papers for Ethereum?

Exemplary flashcards for Blockchain at the TU München on StudySmarter:

Limitations of the Bitcoin Blockchain

Exemplary flashcards for Blockchain at the TU München on StudySmarter:

Attacks on Blockchain networks? Name two.

Exemplary flashcards for Blockchain at the TU München on StudySmarter:

Scarce resources?

Exemplary flashcards for Blockchain at the TU München on StudySmarter:

Could the consensus mechanism be attacked? - It is possible to interfere with the network by a denial of service (DoS) -attack?

Exemplary flashcards for Blockchain at the TU München on StudySmarter:

Could the consensus mechanism be attacked? - It is possible to steal bitcoins?

Exemplary flashcards for Blockchain at the TU München on StudySmarter:

What is a sybil-attack?

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Different Types of Wallets?

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What are the different roles in the Bitcoin Network?

Exemplary flashcards for Blockchain at the TU München on StudySmarter:

UTXO?

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Joint Payments

Exemplary flashcards for Blockchain at the TU München on StudySmarter:

Ethereum Virtual Machine (EVM) - can be specified by which tuple?

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Exemplary flashcards for Blockchain at the TU München on StudySmarter:

Blockchain

Which different papers for Ethereum?
– White Paper
– Yellow Paper
– Beige Paper

Blockchain

Limitations of the Bitcoin Blockchain
– Bitcoin transaction throughput / waiting time
– Energy consumption
– Comparison with established centralized solutions

Blockchain

Attacks on Blockchain networks? Name two.
– 51% attack
– Selfish-mining attack

Blockchain

Scarce resources?
– Proof of Work (PoW)
– Proof of Stake (PoS)
– Proof of Capacity (PoC)

Blockchain

Could the consensus mechanism be attacked? - It is possible to interfere with the network by a denial of service (DoS) -attack?
Assume that a malicious node wants to block all transactions by Bob. This malicious node was selected randomly by the network to propose the new block. It does not include the transaction from Bob, blocking his transaction from getting into its block. However, the next random node (if it is honest) will include Bobs transaction.

Blockchain

Could the consensus mechanism be attacked? - It is possible to steal bitcoins?
All UTXOs are (normally) secured with the hash of the public key of a user. The attacker cannot generate a valid transaction spending these UTXOs if the properties of digital signatures hold.

Blockchain

What is a sybil-attack?
How do we prevent an attacker to create an arbitrary number of nodes to increase her chance to be selected? This is called a sybil-attack.

Blockchain

Different Types of Wallets?
– Brain Wallet
– Paper Wallet
– Hardware Wallet
– Online Wallets

Blockchain

What are the different roles in the Bitcoin Network?
– wallet owners
– light nodes
– full nodes
– miners

Blockchain

UTXO?
Unspent Transaction Outputs (UTXO)

Blockchain

Joint Payments
Two or more people can combine their inputs and create one output. Of course, it requires signatures from all involved people.

Blockchain

Ethereum Virtual Machine (EVM) - can be specified by which tuple?
(block_state, transaction, message, code, memory, stack, pc, gas)

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