cryptographic proof that a neuron authorized a signal. the spell produces the signature — without revealing itself — binding identity to action
a signature proves three things simultaneously: authenticity (the neuron who holds the spell produced this), integrity (the signal content has not been altered since signing), and non-repudiation (the signer cannot deny having signed)
in cyber, every signal carries a signature. the cyberlink batch, the focus allocation, the pay transfer — each requires the neuron's cryptographic commitment before the tru will process it. a signal without a valid signature is indistinguishable from noise
the signature scheme (Ed25519, Schnorr, or stark-compatible variants) determines the security assumptions. proof-carrying signals extend the signature concept: the stark proof itself is a signature — the prover signs the computation with a witness that the verifier checks without re-executing
the relationship between spell, signature, and neuron is triangular: the spell is what you know, the signature is what you show, the neuron is what they see. possession of the spell implies the ability to produce signatures. loss of the spell means the neuron can never sign again — it becomes an inert record in the cybergraph, observable but silent
see spell for the secret half. see proof for the generalized verification framework
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