We propose that the fermion spectrum of the Standard Model can be understood as the set of valid codewords of a quantum error-correcting code defined on a holographic boundary surface. Each fundamental fermion is encoded as a 9-bit string, with stability constraints acting as parity checks that select exactly 90 valid states from 512 possibilities. Conservation laws emerge as bitwise invariants: colour confinement reduces to XOR closure, the CKM mixing matrix maps onto Hamming distances between generation bits, and particle decay rates correlate with the number of parity checks violated. We present the complete codeword table, demonstrate the XOR structure of colour conservation, show that CKM suppression factors scale exponentially with bit-flip distance, and identify a testable prediction linking code distance to particle lifetime. The framework unifies Wheeler’s “it from bit” programme with the holographic principle, ’t Hooft’s cellular automaton interpretation, and the ER=EPR conjecture into a single computational architecture.