What is a chained hash (huella)?

A chained hash or huella is a unique cryptographic code that links each invoice to the previous one in sequence. It ensures that invoices cannot be altered, deleted, or re-numbered without AEAT being able to detect it.

In Zoho Books, the huella is automatically generated and embedded in the VeriFactu-compliant copy of the invoice when it is sent to AEAT through B2Brouter. You don’t need to add it manually.

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