Patent ID: 11886557
Assignee: INTERNATIONAL UNIVERSITY (IU)—VIETNAM NATIONAL UNIVERSITY HCM CITY
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 9:
10. A blockchain-based system, comprising:
(v) a certification unit attached to and operable in cooperation with an Ethereum platform to: (i) provide an issuer graphic user interface (GUI) page, a holder GUI, and a verifier GUI; (ii) providing mandatory components and optional components to each of a plurality of digital certificates using a smart contract of said Ethereum platform, wherein said optional components are characterized to be invisible to verifiers when they are unselected; (iii) publish said plurality of digital credentials in batch to said Ethereum platform; (iv) generate an auditable Merkle tree wherein each leaf node and a root node includes Hash values and attributes of children leaf nodes by adding an extracting and combining function at each of said root node and said leaf nodes; and (v) verify said plurality of digital certificates using said auditable Merkle tree and said smart contract and information on issuer receipts generated by said Ethereum platform upon the receipt of said smart contract by (a) extracting a first Hash value and a first attribute of a certificate to be verified, a second Hash value and a second attribute of an adjacent certificate paired to said certificate to be verified, a third Hash value and a third attribute from a third certificate located in a leaf node next level higher and adjacent to a parent leaf node of said first Hash value and said second Hash value; (b) deriving a Hash value of said root node from said first Hash value, said second Hash value and said third Hash value, wherein said steps above obeys iterative equations:, Hash
   i
   j
  
  =
  
   Hash
   (
   
    
     Hash
     
      i
      -
      1
     
     
      j
      -
      1
     
    
    ,
    
     Hash
     i
     
      j
      -
      1
     
    
   
   ), Attr
   i
   j
  
  =
  
   Combine
   (
   
    
     Attr
     
      i
      -
      1
     
     
      j
      -
      1
     
    
    ,
    
     Attr
     i
     
      j
      -
      1
     
    
   
   )
  
 

wherein i, j are positive integers and i representing number of said plurality of certificates, j representing a height of said auditable Merkle tree; and
(h) a public key infrastructure (PKI) unit coupled to said Ethereum platform and said certification unit via a world wide web.