Wu-Tang Clan has reportedly sold its secret one-of-a-kind double-album, Once Upon A Time In Shaolin, for a price "in the millions."

The album was being sold by online auction house Paddle8 and though it did not reveal the buyer, according to Forbes, it is a private American collector. The sale was agreed upon in May, but finalizing contracts and legal protections took months.

The 31-track album was produced by Tarik "Cilvaringz" Azzougarh with RZA and recorded with the rest of the iconic hip-hop collective over six years, primarily in Marrakech, Morocco. As RZA explained previously, the right to release the album will be transferred only after 88 years, meaning it will likely be at least that long until the public gets to hear these songs.

Last year, it was reported Wu-Tang had received offers up to $5 million for the album.

The new purchase of Once Upon A Time In Shaolin -- whatever the exact price may be -- is said to be a new record for the most expensive single album ever sold.

All other backup copies of Once Upon A Time In Shaolin have been destroyed and sole purchased comes in a silver-and-nickel-plated box and jewel case. The package also includes a 174-page manuscript containing lyrics, credits and back stories on the production of each song, printed on gilded Fedrigoni Marina parchment and encased in leather by a master bookbinder. The buyer will also receive a pair of customized PMC MB2-XBD speakers worth $55,000, included after consultation with PMC.

"The Wu-Tang Clan have always been driven by innovation, and this marks another moment in musical history," said Wu-Tang co-founder RZA in the statement to Forbes. "From the beginning, we hoped that this concept would inspire debate and new ways of seeing creativity. Both of those goals have been achieved, and the ideas continue to evolve."

RZA also said the group would donate a significant portion of the proceeds to charity.