A crowd-funded effort to buy a rare 1787 copy of the US constitution at auction claims to have received more than $13m (£9.6m) worth of cryptocurrency donations.
The group, ConstitutionDAO, says it plans "to put the constitution in the hands of the people", and hopes to raise at least $20m.
But it is not clear how ownership will be arranged if the bid succeeds.
The BBC has approached the group for comment.
Published in 1787, auctioneers Sotheby's estimates a sale price of up to $20m, when the auction takes place on 18 November.
There are 13 known copies to have survived from a run of 500 originally printed after the text was settled at the Constitutional Convention in Philadelphia, Pennsylvania.
The copy for sale is one of only two not held in the collection of an institution, Sotheby's says.
The group wants to put the document on public display.