Errata

In the Conclusion section under Colored Coins there is a bad hypertext "Colored Coins by Colu":

“The two most prominent implementations of colored coins today are Open Assets and Colored Coins by Colu. ”

cln.network/ URL does not resolve

There is a URL at the end of Chapter 6 that no longer renders correctly:

Text:
The following link contains the most recent “strange transactions” that were not fully decoded: blockchain.info/strange-transactions.

There are two bad links on page 295 at the end of Chapter 12 in the "Using Colored Coins Section":

Text:
"A Colu Colored Coins-compatible wallet application and blockchain explorer can be found at Blockchain Explorer."

"A Copay wallet plug-in can be found at Colored Coins Copay Addon."

Both URLs are not rendering correctly.

The curl command:

https://www.blockchain.info/unspent?active=1Cdid9KFAaatwczBwBttQcwXYCpvK8h7FK

returns an empty set, not what is displayed on the page.

The curly braces for the block height should either have three dots, or even better the list of blocks should have three dots and start with the genesis block. As is, the curly braces only embrace 3 blocks.

To have even more verbosity I suggest writing the specific numbers in the text on the right. That is "Block Depth (2)" and "Block Height (27716)"

Using Bitcoin Core v23.0.0 and Python 3.10.4 results in an error when running Python code in Example 3-3. Specifically, "info = p.getInfo()" fails. I had to change it to "info = p.getblockchaininfo() for it to work.

"therefore, if we know the x coordinate we can calculate the y coordinate by solving y^2 (mod p) (x^3+7) mod p"

Perhaps it would be good to write "calculate *the candidates* for the y coordinate" since (as the author later on writes) the solution for y is not unique.

The first item in pointed list is: "A parent private or public key (ECDSA uncompressed key)"
I think the word "uncompressed" is misleading and not congruent with figures 5-10, 5-11 and 5-13: infact parent private keys are uncompressed (of course, a compressed privkey doesn't actually exist), BUT parent public keys in figures are 264bit keys, so they have to be COMPRESSED public keys (256bit for the x-coord and 8 bit for the sign)

Remove: "However, the output value itself is locked by the signature."

Possible replacement: "However, the output value is limited by the values of the UTXOs referred to by the inputs, and those inputs are locked by the signature."

1st and 2nd paragraph:
the four occurrences of "2^32" should be corrected in "(2^32)-1".
"(2^32)-1" in last line of second paragraph should be corrected in "(2^32)-2"

6th paragraph:
"bits 32 and 23" should be changed in "bits 31 and 23"

The probability of a score when a target is 2 is 0%. Perhaps the 2% probability is meant for when the target is 3? Or perhaps the game is defined as throwing less than or equal to a specified target?