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Tech Bureau, Corp.
Tech Bureau, Corp. is a Japanese blockchain technology company. It develops the mijin private-blockchain solution and operates DocuTracker, a blockchain-backed digital archive certification SaaS; it also operated the COMSA NFT marketplace, whose service closure was announced and reported in 2025–2026.
Osaka, JP
Description
Tech Bureau, Corp. provides blockchain solutions and operates an NFT marketplace. Its services include mijin, a private blockchain technology developed with core developers of Symbol/NEM; DocuTracker, which stores file timestamps and hashes on a dedicated blockchain to enable proof that cloud-stored files have not changed; and COMSA, an all-on-chain NFT marketplace. The company serves organizations and users needing blockchain infrastructure, digital-content ownership, and verifiable digital-archive records.Grant Funding
VC Funding
None
2016
2017
$0
$22M