XTRA Bitcoin (CBTC) 1-A Offering $2.5M in Equity

Exhibit 6.3

Austin Homes LLC Paul Knudson, Manager 917 Bobwhite Street Fruitland, Idaho 83619 208 - 707 - 1008 pck710@gmail.com Sub - Lease 912 Bobwhite Street Septen1ber1,2020 Sublessor: Austin Homes LLC Sublessee: XTRA Bitcoin Inc - CBTC Parties agree that XTRA Bitcoin Inc - CBTC hereby subleases shared office space at 912 Bobwhite Street under Austin Hornes LLC's Lease (Master Lease) dated September 1, 2020, with Quail Cove Townhornes (a OBA of The Pines Townhomes LLC) as expressly allowed under the terms of the Lease. Term: Month to month Rate: $250.00 per month Parties agree that all other terms of this Sub - Lease are the terms of the Master Lease. Agreed to by: J i . . t Paul Knud n - CEO XTRA Bitcoin Inc - CBTC paul@xtra bi tcoin.com Paul Knu son - Manager Austin Homes LLC 208 - 707 - 1008 pck71o@gmail.com