Blockchains are decentralized ledgers which, by definition, are not controlled by a central authority. Due to the value stored in these ledgers, bad actors have huge economic incentives to try and cause faults.What algo was the original solution to the potential problem as specified by Satoshi?
Answer(s): D
The big breakthrough when Bitcoin was invented, was the use of Proof-of-Work as a probabilistic solution to the Byzantine Generals Problem as described in depth by Satoshi Nakamoto.
https://medium.com/loom-network/understanding-blockchain-fundamentals-part-1-byzantine-fault- tolerance-245f46fe8419
What are some likely repercussions that could occur as a result of a 51% attack to the Bitcoin network? (Select three.)
Answer(s): A,B,C
The 4 main attacks that can happen directly as a result of the 51% attack are: Selfish mining. Cancelling transactions. Double Spending. Random forks.
https://blockgeeks.com/guides/hypothetical-attacks-on-cryptocurrencies/
____________is a real-time gross settlement system (RTGS), currency exchange and remittance network by __________
Answer(s): A
Ripple is a real-time gross settlement system (RTGS), currency exchange and remittance network by Ripple.
https://ripple.com/
A centralized system is one that that is governed by a hierarchical authority. Which of the following Blockchains would be correctly stated as centralized?
https://medium.com/@dustindreifuerst/permissioned-vs-permissionless-blockchains-acb8661ee095
Message Calls in the Ethereum EVM is limited to a depth of ____________?
Answer(s): C
Calls are limited to a depth of 1024, which means that for more complex operations, loops should be preferred over recursive calls.
https://solidity.readthedocs.io/en/latest/introduction-to-smart-contracts.html#the-ethereum-virtual-machine
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