Hoseki
- Name: Hoseki
- URL: https://www.hoseki.app/
- Category: Bitcoin ownership-verification infrastructure / proof-of-reserves monitoring / asset-verification API / white-label verification control plane
- Tags: bitcoin-ecosystem
- Summary: Hoseki is asset-verification middleware. The useful part is not the statement-generator surface; it is the attempt to turn wallet signatures, exchange connections, and reserve disclosures into reusable proof-of-holdings workflows for lenders, platforms, and auditors.
- What it does:
- Lets holders generate cryptographically verified statements for Bitcoin and other digital assets without sharing private keys
- Offers a Verify API for self-custodial wallet connection, real-time balance viewing, and cryptographic ownership proof generation
- Offers Hoseki Connect for exchange-held assets, giving integrators a unified way to pull and verify holdings across multiple exchanges
- Provides white-label business products including Asset Link and a Verify Portal for branded or email-driven verification request flows
- Operates a public proof-of-reserves-style board that compares verified Bitcoin holdings with reported holdings for companies and ETFs
- Exposes developer docs, status infrastructure, and business-facing product surfaces that position verification as embedded infrastructure rather than a one-off user report
- Key claims:
- The homepage positions Hoseki around “proving ownership while maintaining custody,” which is a stronger framing than generic portfolio reporting or screenshot-based asset proof
- The docs explicitly separate self-custody verification from exchange-linked holdings, showing Hoseki is building a verification layer across both primary ownership models rather than serving only onchain wallet users
- The Verify product page frames the service as “Real-time proof of Bitcoin ownership” and emphasizes customization for business workflows, which supports cataloging it as infrastructure rather than a consumer-only app
- The Asset Link page explicitly says it replaces screenshots and PDFs with white-label verified proof of digital asset ownership, revealing a B2B verification-control-plane use case
- The public proof-of-reserves board shows Hoseki also acting as a verification and monitoring surface for public entities and ETF-style disclosures, not merely as a private API vendor
- Across the site and docs, the clearest pattern is that Hoseki is productizing verifiable crypto-balance attestations for lenders, auditors, platforms, and end users who need evidence of holdings without surrendering custody
- Whitepaper: No canonical Hoseki whitepaper or litepaper surfaced in this pass. The clearest current sources of truth are the official site, API docs, product pages, help-center materials, and public proof-of-reserves board; see
../whitepapers/hoseki-primary-sources-2026-04-28.md. - Sources:
Internal linkages
- Strongest verification and attestation contrasts: openattestation and verite.
Governance / control risk
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Hoseki does not hold the assets, but it does sit in the middle of the verification workflow: connector support, signature flow, exchange coverage, and proof formatting all run through its product choices.
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Useful middleware, not a neutral proof standard.
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Last reviewed: 2026-06-03 UTC