Many watermarking methods for protecting the intellectual property right and authenticating multimedia data have been proposed in recent years. It is possible to guarantee the authenticity of data by using readable and fragile watermarking. In this paper, we propose a visible watermarking technique using newly designed concept of verifiable digital seal image that is based on fragile watermarking. Seal image looks like just a binary(black or white) information after it is converted to digital data by scanning. But, by adding digital signature to the seal image with a watermarking technique, we can get a verifiable digital seal image. The digital seal image can be used as an authentication information for a digital image as well as a digital document. Inserted to digital image as a visible watermark, it guarantees the authenticity of cover image. This paper shows how to construct the verifiable digital seal image and how to apply it to cover image. Results are demonstrated through simulations.