DDEX says the ERN 4.3 update adds more functionality and reduces the complexity from earlier ERN versions. As part of the update, DDEX also updated the ERN Choreography for Cloud Based Storage standard which defines how record companies or distributors can securely transmit information to DSPs and caters for non-repudiation requirements to be met.
Source: DDEX Publishes ERN 4.3 Update & Catalogue Transfer Standard 1.0