@blockchaincommons/envelope - v1.0.0-beta.4
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    Module extension/signature

    SignatureMetadata
    SignOptions
    addSignature
    addSignatures
    makeSignedAssertion
    isVerifiedSignature
    verifySignature
    hasSignatureFromReturningMetadata
    hasSignatureFrom
    hasSignaturesFrom
    hasSignaturesFromThreshold
    verifySignatureFrom
    verifySignatureFromReturningMetadata
    verifySignaturesFrom
    verifySignaturesFromThreshold
    signatures
    sign
    verify
    verifyReturningMetadata