OP_RETURN
data(utf-8) - https://s3.amazonaws.com/api.trato.io-pdfs-dev/d1ac03c0-96e4-11e6-a68d-531bf4c7510c.pdf?AWSAccessKeyId=AKIAIK7366KAYXUWOC4A&Expires=1476982080&Signature=RL3ZdPUghGSAYY13zxfQ4oSSmlA%3Dshow raw data(hex) - OP_RETURN 68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6170692e747261746f2e696f2d706466732d6465762f64316163303363302d393665342d313165362d613638642d3533316266346337353130632e7064663f4157534163636573734b657949643d414b4941494b373336364b41595855574f43344126457870697265733d31343736393832303830265369676e61747572653d524c335a6450556768475341595931337a786651346f53536d6c41253344