Req.4 Wallet Attestation Signature

This commit aims to resolve issue #256

docs/en/wallet-attestation.rst

@@ -14,7 +14,7 @@ The following requirements for the Wallet Attestation are met:
 
 - The Wallet Attestation MUST use the signed JSON Web Token (JWT) format;
 - The Wallet Attestation MUST give all the relevant information to attests the **integrity** and **security** of the device where the Wallet Instance is installed.
-- The Wallet Attestation MUST be issued and signed by an accredited and reliable Wallet Provider, thereby providing integrity and authenticity to the attestation.
+- The Wallet Attestation MUST be signed by the same Wallet Provider that is authoritative for (thus has issued) that wallet, as indicated by the overseeing Accreditation Body/Authority, so that the Attestation will uniquely bind the Wallet Provider to this Wallet Instance.
 - The Wallet Provider MUST ensure the integrity, authenticity, and genuineness of the Wallet Instance, preventing any attempts at manipulation or falsification by unauthorized third parties.
 - The Wallet Attestation MUST have a mechanism in place for revoking the Wallet Instance, allowing the Wallet Provider to terminate service for a specific instance at any time.
 - The Wallet Attestation MUST be securely bound to the Wallet Instance ephemeral public key.