Abstract: A data processing device system may be configured by a program at least to determine particular content associated with a first indication of observable presentation of the visual indicator received from a first device system; store in response to determining that the particular content is associated with the received first indication, a recorded-presentation indication indicating that the particular content or information associated therewith has been device-presented; determine that the particular content is associated with a second indication of a user interaction with the visual indicator received from a second device system; and store in response to determining that the particular content is associated with the received second indication, an indication that the particular content has been interacted with by a user.

Abstract: A first processor-accessible memory device system and a second processor-accessible memory device system of a self-regulating transaction system may each store a respective local copy of one or more transaction ledgers that record transactions. A first data processing device system may be configured to generate a transaction information block associated with a particular market channel, store it in the local copy of a transaction ledger associated with the particular market channel stored in the first processor-accessible memory device system, and transmit it to a second data processing device system over a communications network for storage in the local copy of the transaction ledger associated with the particular market channel stored in the second processor-accessible memory device system.

Abstract: A first processor-accessible memory device system and a second processor-accessible memory device system of a self-regulating transaction system may each store a respective local copy of one or more transaction ledgers that record transactions. A first data processing device system may be configured to generate a transaction information block associated with a particular market channel, store it in the local copy of a transaction ledger associated with the particular market channel stored in the first processor-accessible memory device system, and transmit it to a second data processing device system over a communications network for storage in the local copy of the transaction ledger associated with the particular market channel stored in the second processor-accessible memory device system.

Abstract: A first processor-accessible memory device system and a second processor-accessible memory device system of a self-regulating transaction system may each store a respective local copy of one or more transaction ledgers that record transactions. A first data processing device system may be configured to generate a transaction information block associated with a particular market channel, store it in the local copy of a transaction ledger associated with the particular market channel stored in the first processor-accessible memory device system, and transmit it to a second data processing device system over a communications network for storage in the local copy of the transaction ledger associated with the particular market channel stored in the second processor-accessible memory device system.