Method for registering tokens (T) of an electronic transaction system (TS) that comprises secure elements as transaction units (TE), wherein each token (T) of the transaction system (TS) has at least one token value (v) and a private portion (r) of a token-specific key pair as token elements, having the method steps of: - receiving registration requests (RA) in a token reference register (TRR) of the transaction system (TS), wherein the registration requests (RA) each have at least two token references (TR), at least one token reference (TR) of a first registration request (RA) of the registration requests (RA) and one token reference (TR) of a second registration request (RA) of the registration requests (RA) being identical; - verifying, by way of a verification unit of the token reference register (TRR), whether a token reference (TR) of a registration request can be uniquely assigned to a token (T) of the transaction system (TS), wherein the token reference (TR) is checked for whether it is or was stored in the token reference register (TRR); - storing at least one token reference (TR) other than the checked token reference in the storage unit of the token reference register (TRR) in order to register the token (T) uniquely assigned to this token reference (TR) in the transaction system (TS) if the verification step determines that a token (T) of the transaction system (TS) can be assigned to the checked token reference (TR); characterized in that the step of receiving receives the registration requests (RA) in the token reference register (TRR) as a sequence (RA F ) of registration requests (RA), and the steps of verifying and storing process the registration requests (RA) in the token reference register (TRR) as a sequence (RA F ) of registration requests (RA). - receiving registration requests (RA) in a token reference register (TRR) of the transaction system (TS), wherein the registration requests (RA) each have at least two token references (TR), at least one token reference (TR) of a first registration request (RA) of the registration requests (RA) and one token reference (TR) of a second registration request (RA) of the registration requests (RA) being identical; - verifying, by way of a verification unit of the token reference register (TRR), whether a token reference (TR) of a registration request can be uniquely assigned to a token (T) of the transaction system (TS), wherein the token reference (TR) is checked for whether it is or was stored in the token reference register (TRR); - storing at least one token reference (TR) other than the checked token reference in the storage unit of the token reference register (TRR) in order to register the token (T) uniquely assigned to this token reference (TR) in the transaction system (TS) if the verification step determines that a token (T) of the transaction system (TS) can be assigned to the checked token reference (TR); the step of receiving receives the registration requests (RA) in the token reference register (TRR) as a sequence (RA F ) of registration requests (RA), and the steps of verifying and storing process the registration requests (RA) in the token reference register (TRR) as a sequence (RA F ) of registration requests (RA). <EOS>