offlineExportFullPrivateKey

Exports a full Ed25519 private key offline.

Combines secret shares locally to compute the full private key. Useful in an offline recovery setting where key shares are collected manually and used to recover the full private key on an air-gapped device.

Returns a base58 encoded extended private key (Spriv) extracted from the secret shares. Note that unlike ECDSA or BIP340, there's no standardization for the extended public key format for Ed25519, so 'S' stands for 'Sodot', and this is a somewhat custom derivation scheme adapted for Ed25519.

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