Systems, methods, and apparatuses for implementing commerce rewards across tenants for commerce cloud customers utilizing blockchain technologies in conjunction with a cloud based computing environment are described herein. For example, according to one embodiment there is a system having at least a processor and a memory therein executing within a host organization and having therein: means for operating a commerce cloud platform on behalf of a plurality of merchants, in which the commerce cloud platform provides at least customer payment processing on behalf of the plurality of merchants; receiving a first purchase transaction for an unknown customer from a first one of the plurality of merchants, in which the purchase transaction indicates transaction source information; creating a new global ID for the unknown customer and associating the purchase transaction and the transaction source information with the new global ID at the commerce cloud platform; allocating commerce rewards points to the unknown customer via the new global ID based on the first purchase transaction; receiving a second purchase transaction for the unknown customer from a second one of the plurality of merchants, in which the second purchase transaction indicates transaction source information for the second purchase transaction; prompting the unknown customer associated with the second purchase transaction to confirm they are associated with the first transaction based on at least a partial matching of the transaction source information associated with the first and second purchase transactions; and inviting the unknown customer to participate in a commerce rewards program to redeem the commerce rewards points. Other related embodiments are disclosed.