Errata

Figure 13-2 -> should be “0248…ac - witness”
Figure 13-21 -> should be “0400…ae - witness”
Figure 13-26 -> please consider listing the two signatures for clarity since "<signaturex>" is not defined
Figure 13-27 -> should be “026c…f3 - <pubkeyx>” and please consider listing all three pubkeys for clarity since "<pubkeyx>" is not defined
Figure 13-42 -> please consider listing the two signatures for clarity since "<signaturex>" is not defined
Figure 13-43 -> should be “026c…f3 - <pubkeyx>” and please consider listing all three pubkeys for clarity since "<pubkeyx>" is not defined

Note from the Author or Editor:
These should all be updated. Thanks!

To the illustrator, the witness field is correctly labeled on 13-2 and 13-21, but the hex before is wrong.

Please change 13-26 and 13-42 to have each signature separately
Please change 13-27 and 13-43 to list each pubkey separately

Printed is :
---
6. Install virtualenv:
$ pip install virtualenv
---
The problem is that there is a distintion into different user accounts on Linux. This command only runs like this if you are working with the root account, which you should not do.

The easy fix is to modify the last line to read :
$ pip install virtualenv --user

This will install into the user home directory instead of systemwide, which would require root access.

Note from the Author or Editor:
This is correct.

The text of the bottom left label needs to be changed:

from:
OP_CHECKMULTISIG

to:
OP_CHECKSIG

Hexdump of both receiver and sender's network port should read "208d" instead of "8d20"

Note from the Author or Editor:
Please change Figure 10-2 to be 208d instead of 8d20 for both the receiver port and sender port. the hex in the image above needs to change as well.

Last line should read "which maps to 208d in big-endian hex." instead of "which maps to 8d20 in little-endian hex"

Note from the Author or Editor:
This is correct. I'm making changes into atlas.

The 3rd line from the bottom of p 255 should read:

>>> a, x1, y1 = 5, -1, -1

and the 3rd line from the top of p 256 should read:

10.0 77.0

Also in the code for Exercise 6 in Chapter 2, three files related to this error need to be changed.

1) code-ch02/answers.py
line 48:
a, x1, y1 = 5, -1, -1
line 53:
18.0 77.0

2) code-ch02/jupiter.txt
line 35:
x1, y1, = -1, -1
line 36:
# (-1,-1) + (-1,-1)

3) code-ch02/Chapter2.ipynb
line 171:
"For the curve \\\\(y^{2}\\\\)=\\\\(x^{3}\\\\)+5x=7, what is (-1,-1) + (-1,-1)?"
line 186:
"x1, y1 = -1, -1\n",
line 187:
"# (-1,-1) + (-1,-1)"

Note from the Author or Editor:
The description is exactly what needs to change. I will upload the changes to atlas.