Armed assailants tried to kidnap the daughter and grandson of a French cryptocurrency boss in Paris, police said, in a brazen daytime attack that was caught on camera.

New regulations threaten the security of the personal data of cryptocurrency users and may expose them to "physical danger", the platform at the centre of last week's Paris kidnapping attempt has claimed.

Lauren Sánchez has been stepping out in a parade of bridal looks while in Paris for her bachelorette party ahead of her wedding to Amazon founder Jeff Bezos.

Lauren Sánchez posted a special message as she welcomed a bevy of well-heeled women in Paris to celebrate her looming nuptials to billionaire Jeff Bezos. “Forever starts with friendship,” wrote Sánchez,