Lightweight selective disclosure for verifiable documents on blockchain

Kenji Saito*, Satoki Watanabe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


To achieve lightweight selective disclosure for protecting privacy of document holders, we propose an XML format for documents that can hide arbitrary elements using a cryptographic hash function and salts, which allows to be partially digitally signed and efficiently verified, as well as a JSON format that can be converted to such XML. The documents can be efficiently proven to exist by representing multiple such structures as a Merkle tree and storing its root in blockchain. We show that our proposal has advantages over known methods that represent the document itself as a Merkle tree and partially hide it.

Original languageEnglish
Pages (from-to)290-294
Number of pages5
JournalICT Express
Issue number3
Publication statusPublished - 2021 Sept


  • Blockchain
  • Content extraction signature
  • Privacy
  • Proof of existence
  • Selective disclosure

ASJC Scopus subject areas

  • Software
  • Information Systems
  • Hardware and Architecture
  • Computer Networks and Communications
  • Artificial Intelligence


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