The crypto bros at the center of a twisted kidnapping case allegedly hosted wild sex parties with the help of an apparent madam at the posh New York City townhouse where they are accused of torturing an Italian Bitcoin millionaire, sources told The Post.

The so-called madam, who has not been named publicly, is suspected of recruiting girls from a popular SoHo boutique to party with William Duplessie, 32, and John Woeltz, 37, at the ritzy Prince Street pad, according to the sources.

Footage published by TMZ Thursday apparently showed the recruits inside the lavish digs with the alleged victim, Michael Valentino Teofrasto Carturan, at some point during his three weeks allegedly being held hostage.

On occasion, Carturan — a wealthy trader worth some $30 million — was allegedly made to have sex with the women, the sources said.

Clips and images obtained by the outlet reportedly showed a shirtless Carturan being led on a leash by a blonde woman wearing a tanktop and black pants.

Another video showed Carturan laying on a couch while a man sat nearby with what appeared to be a knife on his lap.

Carturan, 28, was allegedly lured to the Big Apple with the promise that he’d be able to recoup Bitcoin the sick pair had allegedly coerced from him by threatening to kill his family, Manhattan prosecutors have said.

He was picked up from the airport on May 6 and brought to the SoHo house of horrors by a since-suspended NYPD detective who was working security on the side, sources previously said.

Carturan wasn’t tied up until May 11, according to sources — which is when the depraved duo allegedly began torturing him for his Bitcoin password.

He was severely beaten, shocked with electrical wires, forced to smoke from a crack pipe and at one point dangled him from a staircase five stories high, authorities said.

The sick saga only came to light after the Italian national managed to escape on May 23, bloodied and barefoot, when he finally agreed to hand over his computer password as a ruse, cops said.

He fled the home when his captors went to retrieve the device.

Woeltz was arrested that same day in his bathrobe outside the luxury rental, while Duplessie surrendered the following week after partying it up in the Hamptons from Memorial Day weekend.

A subsequent search of the townhouse turned up cocaine, a saw, chicken wire, body armor, night vision goggles, ammunition and polaroid photos of the victim with a gun pointed to his head, prosecutors said

It wasn’t immediately clear if cops were investigating the newly surfaced videos as part of the ongoing case.

The Manhattan District Attorney’s Office declined to comment, and The Post reached out to the NYPD.

Duplessie’s attorney declined to comment Thursday, while Woeltz’s lawyer didn’t immediately return a request.

The two accused kidnappers remain in custody and are due back in court later this month.

— Additional reporting by Amanda Woods