Cryptographic method and system for secure extraction of data from a blockchain

A computer-implemented method comprising:

• associating one or more elements of a structure with a cryptographic sub-key derived from another cryptographic key, wherein the structure is formed by elements within a hierarchical entity, and the hierarchical entity has a plurality of elements organized or associated in a hierarchical relationship;
• extracting or copying, from a blockchain transaction (Tx), data comprising or relating to the cryptographic sub-key associated with the one or more elements;
• and
• transmitting the extracted data to a non-blockchain based computer system associated with the hierarchical entity.

A computing device comprising:

• a processor;
• and
• a memory storing computer-executable instructions that, as a result of execution by the processor, cause the computing device to:
• associate one or more elements of a structure with a cryptographic sub-key derived from another cryptographic key, wherein the structure is formed by elements within a hierarchical entity, and the hierarchical entity has a plurality of elements organized or associated in a hierarchical relationship;
• extract or copy, from a blockchain transaction (Tx), data comprising or relating to the cryptographic sub-key associated with the one or more elements;
• and
• transmit the extracted data to a non-blockchain based computer system associated with the hierarchical entity.

A computer-readable storage medium having stored thereon instructions that, when being executed by a processor, cause the processor to perform a method comprising:

• associating one or more elements of a structure with a cryptographic sub-key derived from another cryptographic key, wherein the structure is formed by elements within a hierarchical entity, and the hierarchical entity has a plurality of elements organized or associated in a hierarchical relationship;
• extracting or copying, from a blockchain transaction (Tx), data comprising or relating to the cryptographic sub-key associated with the one or more elements;
• and
• transmitting the extracted data to a non-blockchain based computer system associated with the hierarchical entity.