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chap 12 tweak

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develop
Clare Laylock 8 months ago
parent cbe4b181ac
commit feec4e5c38
1 changed files with 4 additions and 4 deletions
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ch12_mining.adoc
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@ -660,9 +660,9 @@ this case to vary the output of the SHA256 commitment to the phrase.
To make a challenge out of this algorithm, let's set a target: find a To make a challenge out of this algorithm, let's set a target: find a
phrase that produces a hexadecimal hash that starts with a zero. phrase that produces a hexadecimal hash that starts with a zero.
Fortunately, this isn't difficult, as shown in <<sha256_example_generator_output>>: Fortunately, this isn't difficult, as shown in <<sha256_example_generator_output2>>:
[[sha256_example_generator_output]] [[sha256_example_generator_output2]]
.Simple proof-of-work implementation .Simple proof-of-work implementation
---- ----
$ for nonce in $( seq 100 ) ; do echo "Hello, world! $nonce" | sha256sum ; done $ for nonce in $( seq 100 ) ; do echo "Hello, world! $nonce" | sha256sum ; done
@ -713,7 +713,7 @@ any possible outcome can be calculated in advance. Therefore, an outcome
of specified difficulty constitutes proof of a specific amount of work. of specified difficulty constitutes proof of a specific amount of work.
==== ====
In <<sha256_example_generator_output>>, the winning "nonce" is 32 and In <<sha256_example_generator_output2>>, the winning "nonce" is 32 and
this result can be confirmed by anyone independently. Anyone can add the this result can be confirmed by anyone independently. Anyone can add the
number 32 as a suffix to the phrase "Hello, world!" and compute number 32 as a suffix to the phrase "Hello, world!" and compute
the hash, verifying that it is less than the target: the hash, verifying that it is less than the target:
@ -740,7 +740,7 @@ below the target. The target and difficulty are inversely related.
==== ====
Bitcoin's Proof-of-Work is very similar to the challenge Bitcoin's Proof-of-Work is very similar to the challenge
shown in <<sha256_example_generator_output>>. The miner constructs a shown in <<sha256_example_generator_output2>>. The miner constructs a
candidate block filled with transactions. Next, the miner calculates the candidate block filled with transactions. Next, the miner calculates the
hash of this block's header and sees if it is smaller than the current hash of this block's header and sees if it is smaller than the current
_target_. If the hash is not less than the target, the miner will modify _target_. If the hash is not less than the target, the miner will modify

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