This was the first ever tweet 15 years ago, and it's for sale.

The author, Twitter's boss, Jack Dorsey, has said he'll convert proceeds from the auction to Bitcoin and give it to charity.

Tweet went up for sale as digital memorabilia.

It's being listed as a unique signature on a website for selling Tweet as non fungible tokens or left N.

F.

T s are files that serve as digital signatures to certify who owns photos, videos and other online media.

Dorsey is a known Bitcoin enthusiast.

Payments Company Square Inc.

Also led by Dorsey, invested $170 million more in Bitcoin last month, adding to the mainstream acceptance of the digital currency that's been winning support from several big investors.

Dorsey's tweet could attract a high price, an early bid said at $2.5 million.

The proceeds are being donated to give directly a fundraising project to give cash directly to families experiencing extreme poverty in Africa.