Fue Hal Finney el que dijo que un atacante malicioso podría incluir una transacción de A a B (direcciones que controla) en un bloque, y meter en el mismo bloque una transacción de A a C (que no controla). Si aceptásemos 0 confirmaciones, la transacción de A a C la aceptarías pero nunca se produciría. Eso es lo que se conoce como "ataque Finney" y por eso se requiere al menos una confirmación (y lo de las 0-conf es una boutade)

Hal es una de las personas que mas admiro en el criptomundo, quien recibió la primera transacción de Satoshi Nakamoto y le ayudó en los inicios, a mejorar el codigo de Bitcoin, Actualmente criogenizado, a la espera de una cura futura para el ELA.

Who is Hal Finney? Was He the Real Man Behind Bitcoin?

https://101blockchains.com/who-is-hal-finney-bitcoin/

¿Se pueden encontrar pistas sobre los primeros misterios de Bitcoin en un cerebro crioconservado? - http://goo.gl/alerts/a5E9B

Hal Finney https://g.co/kgs/SdJCxz

"Hal was far more the anarchist than I could ever imagine. I had many in my circle who were anarchist in nature, and I didn’t really think about the utopian goals they held and problems they could cause later on. Hal wanted people to run nodes early on. He is the reason that we had a block cap. I knew that I should have fought back and not have allowed it."

https://medium.com/@craig_10243/hello-dave-330c164a4aad

"One experimental "information market" is BlackNet, a system which appeared in 1993 and which allows fully-anonymous, two-way exchanges of information of all sorts. There are reports that U.S. authorities have investigated this because of its presence on networks at Defense Department research labs. Not much they can do about it, of course, and more such entities are expected."

12 Acknowledgments
My thanks to my colleagues in the Cypherpunks group, all 700 of them, past or present. Well over 100 megabytes of list traffic has passed through he Cypherpunks mailing list, so there have been a lot of stimulating ideas. But especially my appreciation goes to Eric Hughes, Sandy Sandfort, Duncan Frissell, Hal Finney, Perry Metzger, Nick Szabo, John Gilmore, Whit Diffie, Carl Ellison, Bill Stewart, and Harry Bartholomew. ..."

http://groups.csail.mit.edu/mac/classes/6.805/articles/crypto/cypherpunks/may-virtual-comm.html

Untraceable Digital Cash, Information Markets, and BlackNet

("Governmental and Social Implications of Digital Money" panel at CFP '97)

Tim May
Corralitos, CA
tcmay@got.net

5. "Anyone a Mint"

Recent work by Ian Goldberg of UC Berkeley, and similar work by Doug Barnes, Hal Finney, and others, makes a truly anonymous digital cash system possible. Goldberg's scheme allows "e-cashiers" and "e-moneychangers" to disintermediate the process and ensure untraceability. Importantly, anyone can essentially become a "mint" of digital cash...."

http://osaka.law.miami.edu/~froomkin/articles/tcmay.htm

HAL FINNEY

Harold Thomas Finney II was a genius cryptographer, hired by Phil Zimmerman to work on PGP (Pretty Good Privacy), a military-grade encryption software. Hal created the world’s first digital currency system, RPOW (Reusable Proof of Work). Hal helped Satoshi Nakamoto debug Bitcoin’s code. He was the first to receive a Bitcoin transaction. In 2009, Hal was diagnosed with Lou Gehrig’s Disease. He died in 2014.

https://atomicnetwork.tv/product/crypto-crowdfund/

List: cryptography
Subject: stealth, stego & pgp (Re: Eason/Kawaguchi stego)
From: Adam Back <adam () cypherspace ! org>
Date: 1999-06-30

On how to stego pgp messages. First you have to ensure that the data you are stegoing has a rectangular distribution with even probability
of {0,1} for each bit, and apply your stego technique. Various ideas have been discussed, but as anonymous suggests this has all been
worked out for PGP 2.x before.

As anonymous describes one problem is the RSA modulus, because RSA encrypted messages are not uniformly distributed (they are < N the RSA modulus, which gives some skew especially in the distribution of the most significant bits)

Hal Finney, and Bodo Moeller and I independently came up with different algorithms to do this. Hal's algorithm (which is the better
algorithm) is to add a random multiple of N, and then the reverse operation is to assume the recipient's public key:

https://marc.info/?l=cryptography&m=96472454828578&w=2

" Those machines are gone now. I replaced them every 12 to 18 months. Servers were donated to a number of churches and ran email means for such organisations. A couple ran web servers. During the year I started installing machines that ran Windows XP and nodes. There weren’t a lot of machines running Bitcoin in 2009. To my knowledge, Dave ran one machine, that’s full-time, and he ran three or four on or off. Hal Finney ran a machine. Bear ran one or two."

Two steps forward, one step back
by Craig Wright (Bitcoin SV is the original Bitcoin.) https://medium.com/p/two-steps-forward-one-step-back-1ef6e60ccd8e

Bitcoin and me (Hal Finney)
March 19, 2013,

Cada cierto tiempo tengo la costumbre de releer ciertos documentos, para comparar lo que comprendo hoy, con relación a lo que entendí la última vez que lo leí, evidentemente deben ser documentos originales de gente original, este es uno de esos casos, donde hoy lo que voy leyendo de Hal y las explicaciones que voy recibiendo de Craig, hacen que muchas piezas encajen.

Para evitar, que por algún motivo pueda desaparecer, dejo una copia del documento original y una traducción al castellano en la blockchain.
Buena lectura!!!!!!!
https://www.bitpaste.app/tx/3c2c260b60d6959d4654520dab868279dc3d84ffadf168403aa723c2b5110f28