Smart contracts automate the production of a hash value to the blockchain. As enterprises adopt and utilize smart contracts, the need for scanned PDFs will decrease. Our own Chief Scientist, Dr. Stuart Haber was the first person to cryptographically time-stamp a digital document. See: https://crl.anf.es/pdf/Haber_Stornetta.pdf

Dr. Haber’s digital time stamping technique was centrally referenced by Satoshi Nakamoto in creation of Bitcoin. See references 3, 4 and 5 in the bibliography of: https://bitcoin.org/bitcoin.pdf