Prosecution is also possible under state criminal laws, such as prohibitions against criminal fraud, or against the simulation of personal signatures. However, in order to trigger criminal liability under states' laws, the government must prove that the defendant had intent to defraud. The evidentiary burden, as in all criminal prosecutions, is high; proof "beyond a reasonable doubt" is required.[27]

Before addressing those questions, it is useful to consider how provenance is relevant to sales of art. Art litigation generally falls within one of three categories: disputes concerning ownership, disputes concerning authenticity, and, to a lesser extent, disputes concerning value. The provenance of a work may bear on each of those potential areas of dispute. Obviously, to the extent provenance represents a chain of title, it may bear quite directly on a dispute concerning ownership. (If “H.W. Göring, Berlin” is listed in the provenance, that is probably a red flag).3
The United States passed the Banking Secrecy Act in 1970, requiring financial institutions to report certain transactions to the Department of the Treasury, such as cash transactions above $10,000 or any others they deem suspicious, on a suspicious activity report (SAR). The information the banks provide to the Treasury Department is used by the Financial Crimes Enforcement Network (FinCEN), which can share it with domestic criminal investigators, international bodies or foreign financial intelligence units.

Following the Renaissance, the increasing prosperity of the middle class created a fierce demand for art. Near the end of the 14th century, Roman statues were unearthed in Italy, intensifying the populace's interest in antiquities, and leading to a sharp increase in the value of these objects. This upsurge soon extended to contemporary and recently deceased artists. Art had become a commercial commodity, and the monetary value of the artwork came to depend on the identity of the artist. To identify their works, painters began to mark them. These marks later evolved into signatures. As the demand for certain artwork began to exceed the supply, fraudulent marks and signatures began to appear on the open market.

The provenance is listed in chronological order, beginning with the earliest known owner. Life dates of owners, if known, are enclosed in brackets. Uncertain information is indicated by the terms “possibly” or “probably” and explained in footnotes. Dealers, auction houses, or agents are enclosed in parentheses to distinguish them from private owners. Relationships between owners and methods of transactions are indicated in the text and clarified through punctuation: a semicolon is used to indicate that the work passed directly between two owners (including dealers, auction houses, or agents), and a period is used to separate two owners (including dealers auction houses or agents) if a direct transfer did not occur or is not known to have occurred. Footnotes are used to document or clarify information.

Your documents must be investigated—because they are worth nothing until proven to be authentic. You have to be able to trace the qualified individual’s signature, the artist in the question, or previous owners back to real people. This will help you confirm that the document given to you is not fallacious. Unqualified experts attribute art all the time, and the documents might be completely trustworthy.
Forgers of older artworks sometimes attempt to override forensic methods by using or plausibly imitating authentic materials. One of the best-known cases is that of forger Han van Meegeren, who used a modern paint mixture but mimicked an older technique to a sufficient degree that his paintings were certified, as he intended, as originals by the 17th-century Dutch master Johannes Vermeer. Even though further testing can reveal that a paint’s age has been masked, museums and collectors often simply accept initial results.