Bitcoin
1. Double spending is:
The risk that a hash could be the same for two block
The risk that a Timestamp could be the same for two transaction
The risk that a digital currency can be spent twice
2. Proof-of-Work solve the determining representation problem by:
One-IP-address-one-vote
one-GPU-ONE-VOT
one-CPU-one-vote
2&3
1&2
3. What is the Secure Hash Algorithms that Bitcoin using:
SHA-512
SHA-521
SHA-265
SHA-256
4. -------- is the access to your Wallet Bitcoin and can be used to spend
Public key
Private key
Digital Signatures
Not from all of the above
5. Digital keys are produced by a cryptographic algorithm and are totally independent of the blockchain network
True
€‹â€‹False
6. Find the error
first line
Second line
Third line
First & second line
No error
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