Time-ordered cryptographic ledgers

A local computer node, comprising:

• a processor;
• and
• a memory in communication with the processor, the memory storing machine-readable instructions that, when executed by the processor, control the local computer node to:
• receive mix-in data from a remote computer node of one or more remote computer nodes storing one or more remote ledgers, respectively, of a plurality of time-ordered cryptographic ledgers forming a tapestry, the mix-in data comprising:
• a remote identifier that uniquely identifies a remote ledger, of the one or more remote ledgers, among the plurality of time-ordered cryptographic ledgers, the remote ledger being stored on the remote computer node, and
• a remote hash value stored in a block of the remote ledger,
• generate a new hash value by hashing (i) local event data, (ii) the mix-in data, (iii) a local identifier that uniquely identifies a local ledger among the plurality of time-ordered cryptographic ledgers, and (iv) a most-recent hash value of a most-recent block of the local ledger,
• construct a new block that stores (i) the local event data, (ii) the mix-in data, (iii) the local identifier, (iv) the most-recent hash value, and (v) the new hash value, and
• update the local ledger with the new block.