The signed attestation document can include custom data and a public key, in Nitro.
But the problem is what happens if the Cashu TEE restarts, where are the keys?
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will nitro sign that the document originated in the TEE?
but also... right: ecash.
*sigh* the probability of redeeming an ecash token always trends toward zero
can an AWS HSM do the necessary math? you're still bound to the life of a specific HSM, though
KMS