SERVING THE QUANTITATIVE FINANCE COMMUNITY

 
User avatar
TidalFlood
Posts: 33
Joined: January 2nd, 2018, 3:13 pm

Re: End of bitcoin?

February 9th, 2018, 1:14 am

Last edited by TidalFlood on February 9th, 2018, 7:23 pm, edited 1 time in total.
 
User avatar
katastrofa
Posts: 8322
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: End of bitcoin?

February 9th, 2018, 2:57 pm

The section with music for oldies in the Off topic forum.
 
User avatar
Cuchulainn
Posts: 60193
Joined: July 16th, 2004, 7:38 am
Location: Amsterdam
Contact:

Re: End of bitcoin?

February 9th, 2018, 4:34 pm

The section with music for oldies in the Off topic forum.
Indeed.
More worrying, it is GENY 80's stuff, not a great time for music. Should go here

viewtopic.php?f=15&t=97988&p=737241&hilit=gen#p737241
 
User avatar
tagoma
Posts: 18262
Joined: February 21st, 2010, 12:58 pm

Re: End of bitcoin?

February 10th, 2018, 8:32 am

 
User avatar
Cuchulainn
Posts: 60193
Joined: July 16th, 2004, 7:38 am
Location: Amsterdam
Contact:

Re: End of bitcoin?

February 27th, 2018, 4:16 pm

Woz gets scammed 

.https://www.coindesk.com/tech-legend-st ... k-bitcoin/

""Somebody bought them from me online through a credit card and they cancelled the credit card payment," he went on to say. "It was that easy. And it was from a stolen credit card number so you can never get it back.""

// If you ask me, this looks like the well-known ATM race-condition that 1st year CS students learn at school.
shudda been an ACID transaction?
Good timing?

It feels like some kind of ABA

https://en.wikipedia.org/wiki/ABA_problem
 
User avatar
Traden4Alpha
Posts: 23951
Joined: September 20th, 2002, 8:30 pm

Re: End of bitcoin?

February 27th, 2018, 4:57 pm

Woz gets scammed 

.https://www.coindesk.com/tech-legend-st ... k-bitcoin/

""Somebody bought them from me online through a credit card and they cancelled the credit card payment," he went on to say. "It was that easy. And it was from a stolen credit card number so you can never get it back.""

// If you ask me, this looks like the well-known ATM race-condition that 1st year CS students learn at school.
shudda been an ACID transaction?
Good timing?

It feels like some kind of ABA

https://en.wikipedia.org/wiki/ABA_problem
Strange! I thought that those accepting a credit card payment (e.g., a retailer) were protected against losses associated with stolen credit cards as long as they followed the card company's security procedures.

But it does highlight two key weaknesses of BitCoin: 1) there's no (easy) ability to repudiate or rollback a transaction; 2) there's no cryptomagical coverage of the other half of the transaction. The recipient of BitCoins does not need to trust the sender but the sender sure needs to trust the recipient.

The problem is not insolvable using smart contracts and more complex distributed ledgers that handle mutual escrow-like locking of the assets to be exchanged and place a timed lock on both assets to cover transaction review and rollback.
 
User avatar
Cuchulainn
Posts: 60193
Joined: July 16th, 2004, 7:38 am
Location: Amsterdam
Contact:

Re: End of bitcoin?

February 27th, 2018, 5:13 pm

Woz gets scammed 

.https://www.coindesk.com/tech-legend-st ... k-bitcoin/

""Somebody bought them from me online through a credit card and they cancelled the credit card payment," he went on to say. "It was that easy. And it was from a stolen credit card number so you can never get it back.""

// If you ask me, this looks like the well-known ATM race-condition that 1st year CS students learn at school.
shudda been an ACID transaction?
Good timing?

It feels like some kind of ABA

https://en.wikipedia.org/wiki/ABA_problem
Strange!  I thought that those accepting a credit card payment (e.g., a retailer) were protected against losses associated with stolen credit cards as long as they followed the card company's security procedures.

But it does highlight two key weaknesses of BitCoin: 1) there's no (easy) ability to repudiate or rollback a transaction; 2) there's no cryptomagical coverage of the other half of the transaction. The recipient of BitCoins does not need to trust the sender but the sender sure needs to trust the recipient.

The problem is not insolvable using smart contracts and more complex distributed ledgers that handle mutual escrow-like locking of the assets to be exchanged and place a timed lock on both assets to cover transaction review and rollback.
Nice précis.
All in all this is a real mess IMO. I won't be selling bitcoins any time soon.

Indeed, some time of grace period is needed. Now it is cowboys and wild west.

The CC companies might build a no bitcoin clause.
 
User avatar
ppauper
Posts: 70239
Joined: November 15th, 2001, 1:29 pm

February 27th, 2018, 6:44 pm

it seems to have lost something in translation, or wozniak doesn't understand it fully
""Somebody bought them from me online through a credit card and they cancelled the credit card payment," he went on to say. "It was that easy. And it was from a stolen credit card number so you can never get it back.""
"and they cancelled the credit card payment"
who is "they"? surely it's not the person using the "stolen credit card number"? there would be no point and it would actually add risk to the thief
So the credit card company and/or the actual owner of the credit card, and as t4a said, wouldn't there be some protection for the merchant
there's something weird here
 
User avatar
TidalFlood
Posts: 33
Joined: January 2nd, 2018, 3:13 pm

Re: End of bitcoin?

March 7th, 2018, 6:06 pm

 
User avatar
TidalFlood
Posts: 33
Joined: January 2nd, 2018, 3:13 pm

Re: End of bitcoin?

March 23rd, 2018, 8:48 pm

Scholes is getting in on cryptocurrency:

https://www.ft.com/content/bf791ec0-2d6 ... 4b9f08f381
 
User avatar
tw
Posts: 1073
Joined: May 10th, 2002, 3:30 pm

Re: End of bitcoin?

March 26th, 2018, 8:22 pm

Scholes is getting in on cryptocurrency:

https://www.ft.com/content/bf791ec0-2d6 ... 4b9f08f381
I can't beyond the paywall. Is he bullish or bearish?
 
User avatar
TidalFlood
Posts: 33
Joined: January 2nd, 2018, 3:13 pm

Re: End of bitcoin?

March 29th, 2018, 10:40 pm

I don't know.

You could ask him.
 
User avatar
katastrofa
Posts: 8322
Joined: August 16th, 2007, 5:36 am
Location: Alpha Centauri

Re: End of bitcoin?

April 2nd, 2018, 3:55 pm

Economists’ cryptocurrency aims to avoid pitfalls of bitcoin
Reserve-backed Saga designed to win approval of financial and political establishment
Martin Arnold, Banking Editor March 22, 2018

Some of the world’s best-known economists on Thursday announced plans to create what could be described as the thinking person’s cryptocurrency. Saga aims to address many of the criticisms frequently thrown at bitcoin, the world’s biggest cryptocurrency, to position itself as an alternative digital currency that is more acceptable to the financial and political establishment. It is being launched by a Swiss foundation with an advisory board featuring Jacob Frenkel, chairman of JPMorgan Chase International and former governor of the Bank of Israel; Myron Scholes, the Nobel Prize-winning economist; and Dan Galai, co-creator of the Vix volatility index. The Saga token aims to avoid the wild price swings of many cryptocurrencies by tethering itself to reserves deposited in a basket of fiat currencies at commercial banks. Holders of Saga will be able to claim their money back by cashing in the cryptocurrency. The currency also aims to avoid the anonymity afforded by bitcoin, which has raised financial crime concerns with regulators and bankers. Saga will require owners to pass anti-money laundering checks and allow national authorities to check the identity of a holder when required. “While blockchain technologies have gained growing acceptance, encryptic currencies have raised public policy concerns, since they are anonymous, unbacked and are highly volatile,” said Mr Frenkel. “I share these concerns and see great value in Saga’s vision to address them properly.” Deposits will be made in the IMF’s special drawing basket of currencies, which is heavily weighted in US dollars. The Saga foundation has raised $30m from investors, including Mangrove Capital Partners, Lightspeed Venture Partners, The Singulariteam Technology Group and Initial Capital. Instead of opting for a standard initial coin offering, the foundation is creating a different class of token that will to begin with be worth nothing but entitles its investors to a rising number of Saga as usage of the cryptocurrency grows. “We didn’t want to do an ICO,” said Ido Sadeh Man, founder and president of Saga. “It didn’t look reasonable to start a low-speculation and low-volatility vehicle by launching a high-speculation and high-volatility process.” Mr Sadeh Man said the Saga foundation had its development centre in Israel and expected to increase its staff from about 25 people to 70 by the end of this year. “We are not aiming for Saga to replace any national fiat currencies but to be a complementary global currency,” he said. “We are targeting people who are holding digital currencies and looking for safe harbours from the raging volatility.” Saga will be operated on a variable fractional reserve system. This means its price will be able to rise and the amount held on deposit will fall in proportion to the amount of usage achieved by Saga. Smart contracts will automatically increase the difference between the sale price and the reserve value on a sliding scale in response to demand. The Saga token will be available for purchase from the fourth quarter. Some cryptocurrencies have been tied to cash deposits before, such as Tether, which is linked to US dollar deposits but has faced scepticism about the opaqueness of those reserves. Several leading financial regulators have warned about the pitfalls of cryptocurrencies, including Mark Carney, governor of the Bank of England, and Mario Draghi, president of the European Central Bank. This week’s summit of G20 leaders is set to discuss a global regulatory framework for bitcoin and other crypto-assets.
 
User avatar
tw
Posts: 1073
Joined: May 10th, 2002, 3:30 pm

Re: End of bitcoin?

April 4th, 2018, 6:30 pm

Economists’ cryptocurrency aims to avoid pitfalls of bitcoin
Reserve-backed Saga designed to win approval of financial and political establishment
Martin Arnold, Banking Editor March 22, 2018
..................
Thanks!
 
User avatar
wanaquant
Posts: 89
Joined: May 12th, 2012, 1:19 pm

Re: End of bitcoin?

April 6th, 2018, 5:02 pm

Apparently goerge soros is getting into bitcoin: https://www.bloomberg.com/news/articles ... ces-plunge
ABOUT WILMOTT

PW by JB

Wilmott.com has been "Serving the Quantitative Finance Community" since 2001. Continued...


Twitter LinkedIn Instagram

JOBS BOARD

JOBS BOARD

Looking for a quant job, risk, algo trading,...? Browse jobs here...


GZIP: On