B1. Blockchain technology and Bitcoin

Blockchain is an append-only ledger with integrity by design

• True

• False

Bitcoin is a permissioned blockchain that

can only be writen by authorized users

• True

• False

A cryptocurrency is a digital currency based on

cryptography and a consensus protocol

• True

• False

The Bitcoin protocol is specified in an RFC

• True

• False

Who validates Bitcoin transactions?

• Only miners

• Only full nodes

• Both miners and full nodes

• A subset of miners

What are the purposes of a wallet?

• Key generation and storage

• Transaction creation

• Transaction broadcasting

• All the answers are correct

What task does not correspond to network nodes?

• Relay transactions

• Validate data

• Create new bitcoins

• Maintain the P2P network

What task do miners mainly perform?

• Create blocks

• Create transactions

• Create addresses

• Compute address balances

An UTXO...

• contains all the bitcoins stored in a single address

• can not be partially spent

• contains a hash pointer to the transaction that spends it

• contains the signature that allows to spend it

A Bitcoin address

• is an ECDSA private key

• is an ECDSA public key

• is derived from an ECDSA public key

• is a secret number obtained randomly