Computer implemented method and system for transferring access to a digital asset

A method of transferring access to a digital asset comprises providing each of a plurality of participants with a respective share of a second private key of a second private-public key pair of a cryptography system, and splitting the respective share of one of the participants is into a plurality of sub-shares before deleting it. A first blockchain transaction is received from a first participant of the participants by each of a plurality of second participants of the participants, wherein the first participant has a first private key of a first private-public key pair of the cryptography system, and wherein the first blockchain transaction is signed with the first private key. A plurality of the second participants verify that the first blockchain transaction has been signed with the first private key, and apply a respective the share of the second private key to the first blockchain transaction to generate a respective share of a first secret value, wherein the first secret value is a second blockchain transaction signed with the second private key, wherein the first secret value is accessible to a first threshold number of the shares of the first secret value and is inaccessible to less than the first threshold number of shares of the first secret value. At least the first threshold number of the shares of the first secret value are combined, from the first participant and a plurality of the second participants, to generate the first secret value.