İncreaing imaging data acqiusition rates makes it diffcult to storing and authenticaton of the images. Therefore, it is high time to design secure image watermarking algorithm to authenticate imaging data. The major challenge is to efficiently reconstruct the mage back from watermarked image under the watermark attacks. Therefore, his paper proposed to design a hybrid Blockchain (BC) secured watermarking method using the edge detection (ED) of the local discrete wavelet transform (DWT) coefficients. Using ED-DWT combination is expected to enhance the invisibility of watermark to lead robustness. To add robustness edge dilated coefficients are use das local features for watermark insertion process. Method proposed to add security and authentication by implementing BC based SHA256 image encryption over the watermarked images. At the receiver end first BC based decryption is carried out and then image is reconstructed using image de-watermarking. The LAB colour space is used for watermark embedding for colour images. The main contribution of paper is to evaluate the effectiveness of image reconstruction under the exposure of five most common watermark attacks. The qualitative and quantitative evaluation of the watermark reconstruction method is carried out based on the histogram weights and parametric analysis based on the PSNR, NC and SSIM. The results jusrify the effectivness of the proposed method. Certain open reserch challenge based on learnings are also concluded for future scope

Blockchain, Image Security, Watermarking, Edge Detection, DWT, SHA256, Image Reconstruction, Watermark Attacks