code: function _stringToSignature(string_signatures) {
  	const signatures = [];
  	for (let signature of string_signatures) {
  		// check for properties rather than object type
  		if (signature && signature.signature_header && signature.signature) {
  			logger.debug('_stringToSignature - signature is protobuf');
  		} else {
  			logger.debug('_stringToSignature - signature is string');
  			const signature_bytes = Buffer.from(signature, 'hex');
  			signature = _configtxProto.ConfigSignature.decode(signature_bytes);
  		}
  		signatures.push(signature);
  	}
  
  	return signatures;
  }
docs: internal utility method to check and convert any strings to protobuf signatures