Curs BTC

[DanielRo]

Daniel, dar de cripsy se stia de ceva timp nu? Adica nu chiar de azi sau de ieri. Cica ar avea de aface si cu Mike nu-stiu-cum ca s-a retras si a zis ca Bitcoin-ul e mort.

Cand a crescut BTC in noiembrie am schimbat si eu niste litecoin pe BTC la ei si a durat 48 ore. Da cautasem si atunci pe google si erau site-uri care spuneau ca ar avea probleme.
Bitcoin-ul nu e mort, daca acum cateva luni eram de parere ca o alta moneda il poate inlocui acum stiu ca protocolul poate fi imbunatatit printr-un fork.
De exemplu a fost anul trecut un spam de a durat o saptamana. Erau vreo 50 MB de date de procesat la un moment dat, trebuiau sa vina 60 blocuri sa le proceseze, si tot era spamata reteaua, dar a supravietuit. Am scris atunci pe extern ca ar trebui asap imbunatatit trecut la blocuri de 8 MB sau BIP 101. Mi s-a raspuns ca inca nu e nevoie si asa e.
Cat despre BIP 100 ma abtin sa mai comentez, cu Mike Hearn & Company.

Offtopic ca ma bufneste rasul mereu: https://www.sie.ro/rcd2015/Workshop.html
Mike a fost invitat de SIE sa le explice romanilor cum e cu ... criptografia. Cred ca si Ileana din povestea de pe offtopic are IQ-ul peste al lui Mike si peste al celor de la SIE care l-au invitat.

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[antonioeram]

mai sunt unii care canta prohodul. http://www.engadget.com/2016/01/15/mike-hearn-quits-bitcoin/
este normal sa existe fluctuatii. mai ales cand lucrurile inca nu sunt asezate. si nici nu vor fi prea curand.
cat despre sfarsitul experimentului... mai este mult pana acolo. intr-adevar sunt de acord ca este un experiment. panca cand nu va mai fi. doar ca nu se va opri ci doar transforma.

[DanielRo]

mai sunt unii care canta prohodul. http://www.engadget.com/2016/01/15/mike-hearn-quits-bitcoin/
este normal sa existe fluctuatii. mai ales cand lucrurile inca nu sunt asezate. si nici nu vor fi prea curand.
cat despre sfarsitul experimentului... mai este mult pana acolo. intr-adevar sunt de acord ca este un experiment. panca cand nu va mai fi. doar ca nu se va opri ci doar transforma.

Am gasit si eu asta http://news.softpedia.com/news/bitcoin-is-dying-says-famous-bitcoin-developer-499044.shtml

Mike does a much better job at explaining all the problems with Bitcoin, but his blog post is quite long. If you have 10-15 minutes to set aside, we recommend reading his blog post. If you don't, here is a short summary of what he says is currently wrong with Bitcoin.
Nu recomand sa pierdeti 10, 15 minute.

► The Bitcoin blockchain (Bitcoin transactions database) is full and the servers cannot process more than 3 payments per second.
Mda cam asa e acum.

► More than 50% of Bitcoin network and computational power is controlled by a large group of Chinese Bitcoin miners.
F2Pool si AntPool sunt intr-adevar din China, dar intra din toata lumea pe ele.

► These Chinese miners are preventing an increase of the basic Bitcoin transaction block to a value bigger than 1MB, mainly due to poor Internet conditions in China, which will decrease their revenue stream.
Problema nu tine neaparat de conexiunile din China. Un bloc de 8 MB trebuie sa se propage intr-o secunda in toata lumea. De cateva luni se voteaza https://www.blocktrail.com/BTC/pools

► Coinbase, the largest US Bitcoin startup, has been removed from the Bitcoin website, after trying to increase the Bitcoin's blockchain capacity.
E democratie. Se voteaza nu se impune.

► Projects (Bitcoin XT) aimed at advancing Bitcoin and the transaction capacity are actively being banned from the official Bitcoin forums.
Bitcoin XT e un fork, devine o alta moneda. Nu poti face blocuri de 50 MB acum ca a aparut un spam. Se vor propaga greu.

► Companies deploying Bitcoin XT were "coincidentally" hit by DDoS attacks.
Daca e alta moneda, vorbim de unii care se despart de Bitcoin.

► Talking about Bitcoin XT was prohibited at conferences.
Sa-si faca singuri conferintele, nu sa prosteasca pe altii.

► People that never believed in Bitcoin were given full access to the crypto-currency's source code.
Eu stiam ca e open source. O fi vrand sa zica ca parerile unora care nu erau in domeniu pana acum sunt luate in calcul.

► These developers cannot be removed from their positions.
cgminer e facut de Con Kolivas. Nu e altul in lume mai destept ca el.
La Core lucreaza oameni la fel de capabili.

► Fees per Bitcoin transactions are sometimes bigger than credit card charges.
Fals.
Doar daca vorbim de a trimite 0.001BTC, de a spama, putem spune ca fee-ul se simte.

► By not increasing the transaction block size, pressure is put on the blockchain's resources, which indirectly keeps transaction fees up, and even growing.
Fals. Se voteaza. In cateva luni se va implementa un nou protocol, un nou BIP, daca va fi nevoie.

► And the biggest criticism of them all: The people that currently run the Bitcoin Core are planning to allow clients the right to modify transaction details until the transaction appears in the blockchain (Bitcoin transactions database). This means that people can modify the sum or the recipient's wallet address after a payment has been made. Since there are delays on the network (see first point), this can take up to a few hours. Customers can buy anything with Bitcoin, and after they leave the store, they can change the transaction's details and point the money back to themselves, or modify it to zero. As Mr. Hearn puts it, "this makes using Bitcoin useless for actually buying things."
De asta nu stiam. Nu stiu ce sa zic.

Many people in the past criticized the Bitcoin project. This is not something new. But none of those people were of Mike's importance. As soon as his blog post hit social media, impact was immediately felt in Bitcoin's price, which dropped from $440 to $360.
Aici m-a dat pe spate total articolul de pe softpedia.
In ziua aia actiunile erau peste tot in cadere intre 5% si 10% din ce am vazut eu. S-a simtit mai puternic la Bitcoin.

Mike has left the Bitcoin project, has sold all his Bitcoin, and has joined R3, a company that's developing blockchain technology for a conglomerate of banks, together with the Linux Foundation.
Mult succes. Bitcoin versus banci  .

[fraidycat19]

E tare chestia ca a plecat de la Bitcoin la banci si acu` o da pe aia cu cat de naspa e bitcoinul. Are ceva de impartit si de castigat Mike asta ca nu cred ca dupa atata timp cat a fost implicat cu Bitcoin sa se suceasca deodata.

Revenind la subiect, cel mai mult ma enerveaza la bitcoin timpul pana la 1 confirmare. Daca va creste si mai mult va face aproape imposibil de a folosi bitcoin-ul in lumea offline.

[valiz]

► And the biggest criticism of them all: The people that currently run the Bitcoin Core are planning to allow clients the right to modify transaction details until the transaction appears in the blockchain (Bitcoin transactions database). This means that people can modify the sum or the recipient's wallet address after a payment has been made. Since there are delays on the network (see first point), this can take up to a few hours. Customers can buy anything with Bitcoin, and after they leave the store, they can change the transaction's details and point the money back to themselves, or modify it to zero. As Mr. Hearn puts it, "this makes using Bitcoin useless for actually buying things."
De asta nu stiam. Nu stiu ce sa zic.

Tot auzeam de asta de pe la sustinatorii XT ca cica baga astia de la Core RBF si nu mai poti avea nici un fel de certitudine in tranzactiile neconfirmate. Am decis sa caut putin cum sta treaba si nu m-a surprins sa gasesc ca ce ziceau ei era pura propaganda. Uite ce am gasit (BIP125 - RBF):

https://github.com/bitcoin/bips/blob/master/bip-0125.mediawiki

Many nodes today will not replace any transaction in their mempool with another transaction that spends the same inputs, making it difficult for spenders to adjust their previously-sent transactions to deal with unexpected confirmation delays or to perform other useful replacements.

The opt-in full Replace-by-Fee (opt-in full-RBF) signaling policy described here allows spenders to add a signal to a transaction indicating that they want to be able to replace that transaction in the future. In response to this signal,

    Nodes may allow transactions containing this signal to be replaced in their mempools.
    The recipient or recipients of a transaction containing this signal may choose not to treat it as payment until it has been confirmed, eliminating the risk that the spender will use allowed replacements to defraud them.

Nodes and recipients may continue to treat transactions without the signal the same way they treated them before, preserving the existing status quo.

In traducere, pe scurt, vor putea fi inlocuite doar tranzactiile care semnaleaza optiunea asta, si doar cu altele care platesc comision de miner mai mare (si pt cea veche si pt ea).

Mi se pare destul de suparatoare propaganda celor de la XT/UL/Classic. Si atunci cand anuntasera ca vor furca cu XT scazuse pretul destul de tare. 

[DanielRo]

E tare chestia ca a plecat de la Bitcoin la banci si acu` o da pe aia cu cat de naspa e bitcoinul. Are ceva de impartit si de castigat Mike asta ca nu cred ca dupa atata timp cat a fost implicat cu Bitcoin sa se suceasca deodata.

Revenind la subiect, cel mai mult ma enerveaza la bitcoin timpul pana la 1 confirmare. Daca va creste si mai mult va face aproape imposibil de a folosi bitcoin-ul in lumea offline.

Daca sunt multe tranzactii si pui fee mic sau e spamata reteaua si pui fee mic timpul de confirmare o sa fie mare.
Daca pui fee normal timpul e aproape acelasi de doi ani de zile. Daca e spamata reteau si pui fee normal s-ar putea sa dureze mai mult.
Aici vezi tranzactiile in asteptare https://blockchain.info/unconfirmed-transactions
Daca sunt peste 15000 posibil sa fie un spam.

Un bloc poate contine maxim 976 KB din cate am vazut. Deci daca sunt cativa MB in asteptare o sa dureze ceva pana sunt procesati toti. Dar repet. La fee normal n-ar trebui sa ai probleme mari chiar daca e spamata reteaua.
Aici se lucreaza acum. Se voteaza sa se treaca la blocuri mai mari de 976 KB ca sa se poate confirma cat mai multe tranzactii. Din cate am vazut eu se merge spre bloc de 8 MB, si daca se ajunge acolo si nu e spamata reteaua aproape toate tranzactiile vor fi confirmate de blocul urmator.

[valiz]

Votul acela are valoare mai mult simbolica.

[DanielRo]

Votul acela are valoare mai mult simbolica.

Cand se va trece la blocuri mai mari eu zic ca se va tine cont de el. Acum ce-i drept multi sunt de parere ca e ok ca acum.
Eu personal as fi pus in discutie 4 MB nu 8 MB, dar daca asa au hotarat ei sa voteze.

Intr-adevar voteaza adminii de la pool-uri, dar ei stiu cel mai bine cu ce viteza se propaga blocurile.