​​A Spanish crypto mining project has gained a new 300 MW power supply agreement with a Chinese provider Risen Energy

https://ctlgr.com/7297

Valenciaport expone en Rotterdam que utilizará el blockchain para dar visibilidad “extremo a extremo” de la cadena logística
https://www.valenciaport.com/valenciaport-expone-en-rotterdam-que-utilizara-el-blockchain-para-dar-visibilidad-extremo-a-extremo-de-la-cadena-logistica/

Estas son las palabras de Jaime Sánchez con la descripción del Meetup de avalbit de hoy, lo cierto es que me he quedado perplejo, no se si yo podría hablar tan bien de mi mismo, se nota el aprecio y cariño que me tiene, por suerte el sabe que es mutuo, muchas gracias Jaime, un fuerte abrazo.

https://www.meetup.com/es-ES/ValenciaBitcoin/events/254910949/?_xtd=gqFyqTE4NTgzMDQxNaFwo3dlYg&from=ref

DESCRIPCIÓN: Otra quedada más de Avalbit.org para iniciados avanzados y principiantes, con un buen ambiente y buen rollo disfrutaremos de aprendizaje y debate sobre el mundo #cryptoeconómico. Como siempre intentamos traer invitados de lujo para que nos cuenten sus experiencias. Esta vez nos acompaña un GRANDE porque esa es la palabra. Este no es una quedada usual. Es una cita que no puedes perderte, Ramón Quesada

Un compañero, un amigo, uno de los top 50 influencers a nivel mundial sobre #Blockchain y #criptomonedas y que tenemos la suerte de tenerlo en Avalbit.org está claro que sin él esta asociación no sería lo que es, afianzando una serie de valores y progreso aportados por Ramón, un tipo honesto donde los haya, gran mediador, mejor persona. Nos hablará de toda la locura que le ha cambiado la vida, desde una perspectiva muy llana, de su historia real y sus experiencias, ayudará a comprender que éste no es sólo un tema de inversión, sino de una cambio de paradigma, aclarará muchas lagunas y preguntas que la gente se está haciendo y que TÚ si estás leyendo ésto y eres de los nuevos navegantes en estas aguas, AGRADECERÁS. Te esperamos!

https://www.meetup.com/es-ES/ValenciaBitcoin/events/254910949/?_xtd=gqFyqTE4NTgzMDQxNaFwo3dlYg&from=ref

Bitcoin 'Breakthrough' Claims Block Size Increase Possible Without Hard Fork

https://www.coindesk.com/bitcoin-breakthrough-tech-forward-blocks/

Alibaba presenta patente para un sistema de cadena de bloques que permite "intervención ... - http://goo.gl/alerts/qrcym

Aún te preguntas para que sirve la blockchain?, qué tal si le echas un vistazo a éste documental.

"Hacking Democracy (subtitulado en español)" en YouTube
https://youtu.be/uCp7ImaEJ1k

Ver "Crypto Birds S02E01: Entrevista a Vicent Nos de Lescovex y Carlos Martín Crypto Birds" en YouTube
https://youtu.be/dUVpGKM4KdM

Replace-by-fee

Up to this point we have been considering a network where all miners are using the “first-seen” policy or variations thereof. In such a network, we can detect double spends and thus prevent almost all fraud attempts as long as our code is up-to-date with the various differences in miner policy.

But opponents of zero confirmations transactions envision a dystopian world in which would-be fraudsters pay miners higher transaction fees to ignore the first-seen rule and include double spends in their blocks, essentially aiding in the fraud. In such a scheme, a thief could leave the store with the merchandise, then find a willing miner to help them defraud the merchant and replace the valid transaction with the double spend.

The theory goes that miners are rational profit-maximizers so why wouldn’t they accept higher fees if people are offering? Furthermore, people who hold this view believe that it is “inevitable” that miners will abandon the “first-seen” policy for “replace-by-fee” because, after all, this is basic game theory and economics.

But there are problems with this theory. The biggest of which is that Bitcoin has existed for six years so far and not a single miner has implemented this “inevitable” policy. There have been two attempts that I know of. The first was a mining pool called BitUndo which was run out of the Bitcoin community with pitchforks without a single miner joining the pool. The second was when Peter Todd convinced some horrifically confused Chinese miners to use his patch only to have them switch back hours later when they realized the mistake they made. Typically, only dogmatists cling to a theory in the face of overwhelming empirical evidence to the contrary.

So why haven’t miners rushed to adopt this “profit maximizing” policy? Well maybe one reason is that it isn’t actually profit maximizing. The theory outlined above seems to be unduly focused on short run profits and not the overall health of the bitcoin ecosystem which is necessary for maximizing long term profits over the life of their mining investments. Blowing up zero confirmation transactions to the point where retail stores stop accepting Bitcoin, while simultaneously enabling rampant fraud, hardly seems good for the value of your mining operation.

Furthermore, maybe miners (correctly) recognize that the only use case for the replace-by-fee policy is to defraud merchants and don’t want to take part in an activity is clearly immoral and likely also illegal. Now to clarify, there is a lesser form of replace-by-fee, called “first-seen-safe” which is useful for bumping transaction fees on transactions that get stuck, but does not allow double spending. The “full” replace-by-fee we are discussing here has no other purpose but to allow miners to accept fees in exchange for helping to defraud merchants.

You would think that this would be a policy that should be roundly denounced and discouraged at every turn; yet in the bizarro world of Bitcoin core development, we not only have developers supporting such a policy, but writing code and attempting to persuade miners to use it! I’ve even heard it argued that, if for no other reason, RBF should be adopted because it will teach people not to accept zero confirmation transactions since they are unsafe. This is the functional equivalent to slashing someone’s tires because there is a tiny percentage chance they will get into an accident if they drive. “Driving is unsafe!” It’s incredibly paternalistic and disingenuous.

Mike Hearn News
https://t.me/joinchat/AAAAAE2kLGGSbXPeCil1xg