A method for supporting identity management of travelers in an airport using a distributed ledger system, wherein the distributed ledger system includes a global identity blockchain and several security blockchains, wherein the global identity blockchain is accessible by entities of the distributed ledger system, wherein a security blockchain is employed for a predetermined flight segment, such that the security blockchain is accessible only by entities of the distributed ledger system that are involved in the predetermined flight segment, and wherein the security blockchain relies on the global identity blockchain for the management of the travelers' identity, the method comprising: receiving, by the global identity blockchain, a registration request from a traveler via a traveler device, wherein the registration request includes a commitment for identity data that is uploaded by the traveler in a secure cloud storage, and wherein said commitment is recorded in the global identity blockchain, receiving, by the global identity blockchain, a result of an identity verification with respect to the traveler from a verifier entity, wherein said result is recorded in the global identity blockchain, receiving, by the security blockchain, a ticket registration transaction that is issued by an airline entity, wherein the ticket registration transaction comprises a unique traveler ID of the traveler, and issuing, by the security blockchain, an access control list update for the secure cloud storage upon reception of consent by the traveler, the access control list update defining one or more entities being allowed to have access to the identity data of the traveler stored in the secure cloud storage. a distributed ledger system, wherein the distributed ledger system includes a global identity blockchain and several security blockchains, wherein the global identity blockchain is accessible by entities of the distributed ledger system, wherein a security blockchain is employed for a predetermined flight segment, such that the security blockchain is accessible only by entities of the distributed ledger system that are involved in the predetermined flight segment, and wherein the security blockchain relies on the global identity blockchain for the management of the travelers' identity, receiving, by the global identity blockchain, a registration request from a traveler via a traveler device, wherein the registration request includes a commitment for identity data that is uploaded by the traveler in a secure cloud storage, and wherein said commitment is recorded in the global identity blockchain, receiving, by the global identity blockchain, a result of an identity verification with respect to the traveler from a verifier entity, wherein said result is recorded in the global identity blockchain, receiving, by the security blockchain, a ticket registration transaction that is issued by an airline entity, wherein the ticket registration transaction comprises a unique traveler ID of the traveler, and issuing, by the security blockchain, an access control list update for the secure cloud storage upon reception of consent by the traveler, the access control list update defining one or more entities being allowed to have access to the identity data of the traveler stored in the secure cloud storage.