Interface signOptionsType

Additional data (usually raw value) that is being signed For example, when signing a block this would be the output of UnsignedBlock.toBytes(false)

Is this signing or verification for an X.509 certificate ? The format can be different between our native format and what is accept for X.509

Optional domain-separation namespace applied to data before hashing and signing (or verifying), using the NamespacePrefix schema. This prevents cross-context signature reuse between applications that share a key but use different namespaces.

Signer and verifier MUST supply the same namespace. Domain separation is applied regardless of raw; raw controls only the subsequent hash step.

If namespace is a string, the 1-255 byte limit applies to the UTF-8 encoded namespace bytes, not the string's character count.

Perform signing or verification on the raw data ?

The default is false (meaning the data will get hashed before signed)