Our pick from this week's auctions and exhibitions

"Blockchain participants have had little guidance from regulators as to how they plan to shape the law so as to protect against criminal activity"

The technology offers the promise of a world in which a work of art’s provenance is held on a single database—if it lives up to the hype

After waves of closures, the pricey West Side art district sees a frenzy of growth this fall

Moscow contemporary art fair features a Qatari contemporary art exhibition in Russia as the two countries try to foster cultural ties

Do falling exhibitor and visitor numbers at La Biennale Paris signal the beginning of the end for this once world-class art fair?

The art dealer will pay $3m in restitution to the IRS after falsifying returns to hide her use of gallery profits to upgrade her Manhattan home

As with Art Basel, the aim is for larger dealers to subsidise smaller galleries, with plans to roll out similar models in London and New York

In September 2008, Damien Hirst sold £111m of art as Lehman Brothers collapsed, triggering a financial crisis. A decade on, what has changed?

Dealers say it is a ‘step in the right direction’ but acknowledge there is a long way to go to redress the balance

$450.3m Leonardo da Vinci painting was due to be unveiled at museum in two weeks but its display has now been delayed

The Art Newspaper invites Matthew Landrus to expand on his theory on attribution to Leonardo and studio

American collector's works, from Doig to decoy ducks, are to be offered across ten sales at Sotheby’s over the next eight months

A further 6,000 items belonging to Ali Aboutaam of Phoenix Ancient Art are still held by authorities in Geneva

The gallery says it has been “pulled into a dispute regarding a transaction in which it was not involved”

The female Italian Baroque artist's depiction of Lucretia is thought to have been in European collection since the 19th century

Events dedicated to photographs, antiques, crafts and curiosities offer niche disciplines for collectors

Maryam Goudarzi claims that the artist should return six 1972 sculptures worth $6m to her, but Tanavoli says they were swapped legally for five newer works

Auction house is enlisting dealers and curators to promote the legacy of the polymath who is believed to have cursed his collection

With more than 120 galleries, fair's second edition will test the strength of the German capital's under-developed art market

Just two paintings significantly damaged the auction house's bottom line in the second quarter

The fair's artistic director Nato Thompson explains what sets this "underdog" event apart from the usual art fair frenzy

Elena Soboleva to head up the virtual gallery and expand its collector base as galleries embrace selling art digitally as an 'evolution of the walk-in business'

IADAA and CINOA argue that compromise amendments to contentious new cultural goods regulations are still too stringent and ill-defined

As new tech wealth pulls in established names, some fear this eclectic market will become homogenised

Marina Abramovic’s ex-partner has signed up with Richard Saltoun gallery

New technology is shedding light on an Old Master as the prolific, multi-talented artist enjoys a renaissance

Activist launches Jeffrey Deitch’s new Hollywood gallery and will show works with talent agency UTA

Judge finds in favour of Arts Council England, but collector Kathleen Simonis argues Italian laws are incompatible with EU free movement of goods

Detroit house was saved in 2016 by the US artist Ryan Mendoza and Parks’s niece Rhea McCauley