Ciro Santilli @cirosantilli 37

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AWS Deep Learning Base GPU AMI (Ubuntu 20.04) Updated 2025-07-16

These come with pre-installed drivers, so e.g. nvidia-smi just works on them out of the box, tested on g5.xlarge which has an Nvidia A10G GPU. Good choice as a starting point for deep learning experiments.

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Bitcoin developer Updated 2025-07-16

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Craig Steven Wright meme Updated 2025-07-16

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TODO find the Shroud of Turin one.

twitter.com/digitalnaut/status/1757464079076098212 vampire killed by cross of cryptographic evidence

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Brazilian cuisine Updated 2025-07-16

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DeepFloyd IF Updated 2025-07-16

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github.com/deep-floyd/IF

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Bitcoin IRC channel Updated 2025-07-16

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A lot of important development discussion happened in those channels: en.bitcoin.it/wiki/IRC_channels

At www.reddit.com/r/Bitcoin/comments/5pvp6m/is_there_a_log_for_the_bitcoin_irc_channel/ "Is there a log for the bitcoin IRC channel?" Luke Dashjr comments:

No, it is meant to be private without logging allowed.

User "midmagic" (TODO identify) then comments:

The #bitcoin channel on Freenode is "officially unlogged." That means we officially don't publish the logs anywhere, and if we find that logs are published somewhere, we ask that they be taken down

Some IRC logs were dumped into the Bitcoin blockchain at: IRC log dumps where they cannot be deleted.

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Bitcoin inscription method Updated 2025-07-16

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Bibliography:

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useEffect Updated 2025-07-16

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This should only be used for things that happen outside of the state that React trackes, e.g. window event handlers.

Examples:

react/ref-click-counter-func.html

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bsub Updated 2025-07-16

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Submit a new job. The most important command!

Docs: www.ibm.com/docs/en/spectrum-lsf/10.1.0?topic=bsub-options

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Connect two computers directly without a router with an Ethernet cable Updated 2025-07-16

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For IP-level communication, askubuntu.com/questions/22835/how-to-network-two-ubuntu-computers-using-ethernet-without-a-router/116680#116680 just worked between P51 and P14s both on Ubuntu 23.10 connected with a regular Cat 5e cable.

On both machines, first we found the Ethernet cable interface name with the ip CLI tool:

ip a

which outputs on the P41s:

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enp1s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether fc:5c:ee:24:fb:b4 brd ff:ff:ff:ff:ff:ff
3: wlp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 04:7b:cb:cc:1b:10 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.123/24 brd 192.168.1.255 scope global dynamic noprefixroute wlp2s0
       valid_lft 61284sec preferred_lft 61284sec
    inet6 fe80::3597:15d8:74ff:e112/64 scope link noprefixroute
       valid_lft forever preferred_lft forever

so the interface was enp1s0f0, because wlp is wireless and lo is localhost.

So on the P14s we assign an IP of 10.0.0.10 to the P51:

sudo ip address add 10.0.0.10/24 dev enp1s0f0

Then on the P51 analogously, giving IP of 10.0.0.20 to the P14s:

sudo ip address add 10.0.0.20/24 dev enp0s31f6

And after that, P14s can:

ping 10.0.0.10

and P51 can:

ping 10.0.0.20

TODO after a few seconds, the settings appear to be forgotten, and ping stops working unless you do sudo ip address add on the local machine again. This seems to happen after a popup appears saying "Activation of network connection failed" as it fails to obtain Internet from the cable.

TODO list and delete such manual assignments we've made.

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Cool data embedded in the Bitcoin blockchain / Nelson-Mandela.jpg analysis Updated 2025-07-16

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The toplevel transaction is 78f0e6de0ce007f4dd4a09085e649d7e354f70bc7da06d697b167f353f115b8e

Like all AtomSea & EMBII uploads, the data it is encoded as P2FKH.

The full concatenated payload contains the following ASCII characters:

8881a937a437ff6ce83be3a89d77ea88ee12315f37f7ef0dd3742c30eef92dba|396*8881a937a437ff6ce83be3a89d77ea88ee12315f37f7ef0dd3742c30eef92dba
575061146335bd57f2dc132112152d0eeea44cf187ea6a52ac02435a7e5bea44
674c7cc34ea44bb276c6caf76f2b28fa1597380ab6e6a6906076d8f7229ca5b3
8e2642416ad20924b43f51a633fa1c0a5ba8e4a7b631877db1c64540a42081c9
a3084018096b92af04df57b6116e01ff4b7c7e8bd228235ed49e23f4a2817029
39348722b841afa0c5b67e5af10839afe965ed1b24874e89336bea9fa4ef3091
tomSea & EMBII

Output 2 is a change, so it contains no data and has been excluded. Change appear to be randomly placed in the list of output of the uploads, but they can be easily removed because they are the only output with a different value.

The newlines shown above are explicitly encoded as CR LF newlines with characters 0d 0a.

396 is the number of payload bytes between 396*8881a937a437ff6ce83be3a89d77ea88ee12315f37f7ef0dd3742c30eef92dba and the last txid 39348722b841afa0c5b67e5af10839afe965ed1b24874e89336bea9fa4ef3091, including newlines but exclusding the last line.

The last line appears to contain arbitrary data to fill out the 20 byte payload granularity:

A is missing from AtomSea
there is a NUL character just after EMBII, possibly part of the protocol?

Now let's inspect the transactions linked to from toplevel.

tx 8881a937a437ff6ce83be3a89d77ea88ee12315f37f7ef0dd3742c30eef92dba contains only payloads without any change. It starts with the following UTF-8 string with CR LF spaces;

"396\“There is nothing like returning to a place
 that remains unchanged to find the ways in
 which you yourself have altered.”
 -Nelson Mandela


Nelson Rolihlahla Mandela was a South African anti-apartheid revolutionary, politician and philanthropist who served as President of South Afrd۽^2c'︨`ica from 1994 to 1999. -Wikipedia

Born: July 18, 1918, Mvezo, South Africa
Died: December 5, 2013

396 is once again the number of payload bytes present in that string.

This is immediately followed without any separator by a filename, and another size marker:

Nelson-Mandela.jpg?14400/

then followed by all the 14400 - len(Nelson-Mandela.jpg?) + len(/) JPEG bytes bytes, starting with the two JPEG file signature byte "FF D8".

Further toplevel transaction payloads are then simply concatenated with the previous ones, until the last bytes of the image "FF D9" appears at the end of the payload.

00000430  d2 81 de 80 0c 52 f1 40  ea 29 68 03 ff d9 6f 6d  |.....R.@.)h...om|
00000440  53 65 61 20 26 20 45 4d  42 49 49 00              |Sea & EMBII.|

padded once again by an AtomSea & EMBII string fragment terminated by a NUL character.

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Emotion Updated 2025-07-16

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Computer science course of the University of Cambridge Updated 2025-07-16

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The courses are highly open, almost everything is given publicly except solutions, many of which are given to teachers only. Well done!

Past exam papers index: www.cl.cam.ac.uk/teaching/exams/pastpapers/

www.cl.cam.ac.uk/teaching/2223/