The Bitcoin campaign, which has received more than 5,000 mostly small-dollar donations, has been supported by a handful of large infusions from cryptocurrency boosters. The two biggest, with a combined value of more than $300,000 at the time they were made, were donated anonymously.

A series of others valued at about $42,000 each appear to be associated with an online challenge by a former software engineer who goes by the pseudonym LaserHodl and asked other Bitcoin fans to join him in supporting the trucker convoy. Jesse Powell, founder of the crypto exchange Kraken, tweeted his agreement, and a donation attributed to him appears in the data.

Benjamin Dichter, one of the convoy organizers, said at a news conference last week that after the cryptocurrency crowdfunding campaign began, he received offers of help from “major players” in the crypto markets.

“I was shocked how quickly I started getting messages from some of the most prominent Bitcoiners in the world,” he said.

The GiveSendGo data leak was announced Sunday evening on a webpage titled “GiveSendGo IS NOW FROZEN,” with a five-minute video in which a manifesto by the anonymous hackers scrolled across the screen. In it, the hackers complained that the trucker protest had “held a city hostage” and warned it “could be cover for a type of Trojan horse attack where extremists and militia groups may arrive in large numbers with weapons.”

The data contains a record for each donation that includes the donor’s name, ZIP code and the email address they used. It is not possible to independently verify every donation, but some of them line up with donations that had publicly appeared on the GiveSendGo website before it went offline.

For example, Mr. Siebel was cited last week by a Canadian news network, which noted that his name appeared with the $90,000 donation, at the time it was made, on the web page for the convoy campaign. About half the donations were not accompanied by a person’s name when they publicly appeared on the page.