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1. (WO2019048901) DOCUMENT AUTHENTICATION USING DISTRIBUTED LEDGER
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CLAIMS

1. A method comprising authenticating a certificate,

wherein authenticating said certificate comprises obtaining, from a backend server, authorization to issue an adhesive sticker to be placed on said certificate, said adhesive sticker having memory and a transponder integrated therein, reading a form-control number that has been printed onto said certificate, storing particular information that is printed on said certificate in said memory, obtaining, from said chip, information identifying said chip, calculating a first hash based on said information identifying said chip, information on said certificate, and said form-control number, storing said first hash in a block chain, and placing said sticker on said certificate.

2. The method of claim 1, further comprising receiving a request to authenticate said certificate, reading information from said memory, said information comprising said information identifying said chip, information on said certificate, and said form-control number, calculating a second hash based on said information that has been read from said memory, determining that said second hash matches said first hash stored on said block chain, and providing data indicating that said certificate is authentic.

3. The method of claim 2, wherein no online connection is available and wherein calculating said second hash comprises calculating said second hash locally at an authenticated slave.

4. The method of claim 2, wherein calculating said second hash comprises calculating said second hash remotely at a back-end server.

5. The method of claim 1, wherein storing particular

information comprises using a near-field communication protocol to store said information.

6. The method of claim 1, further comprising pre- personalizing said chip, wherein pre-personalizing comprises hashing said information identifying said chip, thereby generating a hash value, and storing said hash value in a read-only memory block of said chip.

7. The method of claim 6, further comprising transmitting information to a secure database for storage therein, said information comprising said hash value and information related to said chip.

8. The method of claim 1, wherein said chip implements the IS014443-4 standard.

9. The method of claim 1, further comprising storing

context information in said chip, said context

information selected from the group consisting of image data and biometric data.

10. The method of claim 1, further comprising storing

context information in said chip, said context

information comprising information that can only be read by an authorized reader and information that can be read by any reader.

11. A manufacture comprising a sticker, a chip, and a transponder, said chip having a memory, said sticker having an obverse and a reverse, wherein a side selected from the group consisting of said obverse said reverse comprises a recess in which said chip and said transponder are placed, said memory having stored therein a first hash representative of a unique identifier of said chip, particular information associated with a certificate to which said sticker adheres, and an inventory control number identifying said sticker, wherein said first hash matches a second hash stored in a block chain.

12. The manufacture of claim 11, wherein said memory is a read-only memory block.

13. The manufacture of claim 11, wherein said memory

comprises context information stored therein, said context information comprising one of image data and biometric data.

14. The manufacture of claim 11, wherein said memory

comprises context information stored therein, said context information comprising information that can only be read by an authorized reader and information that can be read by any reader.

15. The method of claim 11, wherein said chip implements the IS014443-4 standard.

16. The manufacture of claim 11, wherein said side is said reverse .

The manufacture of claim 11, wherein said side is said obverse .