IN WITNESS WHEREOF, the parties have executed this Amended and Restated Right of First Refusal and Co-Sale Agreement as of the date first written above. INVESTORS: Crypto Currency Partners H LLC By: Name: W. Bradford Stephens Title: Managing Partner Crypto Currency Partners II LP By: Name: W. Bradford Stephens Title: Managing Partner Crypto Currency Partners LP By: Name: W. Bradford Stephens Title: Managing Partner SIGNATURE PAGE To AMENDED AND RESTATED RIGHT OF FIRST REFUSAL AND CO-SALE AGREEMENT EFTA01092587 IN WITNESS WHEREOF, the parties have executed this Agreement as of the date first written above. INVESTORS: Crypto Currency Partners H LLC By: Name: W. Bradford Stephens Title: Managing Partner Crypto Currency Partners H LP By: Name: W. Bradford Stephens Title: Managing Partner Crypto Currency Partners LP By: Name: W. Bradford Stephens Title: Managing Partner SIGNATURE PACE TO AMENDED AND RESTATED INVESTORS' RIGHTS AGREEMENT EFTA01092588 IN WITNESS WHEREOF, the parties have executed this Series C Preferred Stock Purchase Agreement as of the date first written above. PURCHASERS: Crypto Currency Partners H LLC By: Name: W. Bradford Stephens Title: Managing Partner Crypto Currency Partners II LP By: Name: W. Bradford Stephens Title: Managing Partner Crypto Currency Partners LP By: Name: W. Bradford Stephens Title: Managing Partner Address: One Ferry Building, Suite 255 San Francisco, CA 94111 SIGNATURE PAGE TO STOCK PURCHASE AGREEMENT EFTA01092589 IN WITNESS WHEREOF, the parties have executed this Voting Agreement as of the date first written above. INVESTORS: Crypto Currency Partners H LLC By: Name: W. Bradford Stephens Title: Managing Partner Crypto Currency Partners II LP By: Name: W. Bradford Stephens Title: Managing Partner Crypto Currency Partners LP By: Name: W. Bradford Stephens Title: Managing Partner SIGNATURE PAGE TO AMENDED AND RESTATED VOTING AGREEMENT EFTA01092590