Multi-layered blockchain for digital assets

One or more non-transitory computer-readable media storing instructions which, when executed by one or more processors, cause:

• storing, in a first blockchain, transaction entries for transactions performed on individual items;
• wherein storing transaction entries in the first blockchain includes:
• generating a first item-level hash value that uniquely identifies a first item;
• storing the first item-level hash value in a first block that belongs to the first blockchain;
• in response to a first transaction that affects the first item, storing a first transaction entry in a second block that belongs to the first blockchain;
• wherein the first transaction entry includes the first item-level hash value and transaction data relating to the first transaction;
• storing, in a second blockchain, transaction entries for transactions performed on specific groups of individual items;
• wherein storing transaction entries in the second blockchain includes:
• generating a first group-level hash value that uniquely identifies a specific group of two or more items;
• wherein the two or more items include the first item;
• storing the first group-level hash value in a third block that belongs to the second blockchain that is distinct and separate from the first blockchain;
• in response to a second transaction that affects the specific group as a whole, storing a second transaction entry in a fourth block that belongs to the second blockchain;
• wherein the second transaction entry includes the first group-level hash value and transaction data relating to the second transaction.