A technology project that draws its value from applications.
Doichain has been a productive blockchain with real-world usage since 2018. wDOI opens that substance up to the Ethereum ecosystem — as a 1:1 backed ERC-20 token whose economics rest on the real value of Doichain applications, not on speculation.
Substance, not promise
In the crypto world, the distance between announcement and reality is often large. This page narrows that distance by disclosing, for every single application of Doichain, the maturity stage it is in — productive, in pilot, in development or planned.
That separation is the most important piece of information on this page. It matters more than any individual application, because it shows how we work: we say plainly what is real, and we mark cleanly what is not yet real.
Applications at a glance
Filter by status. Every card carries a maturity index and, where available, a direct link to the code, the app or the funded project.
Doichain itself
A productive PoW blockchain live since 23 May 2018. 21M DOI, 10-minute blocks, second halving in October 2024.
DoiWallet (iOS & Android)
Open-source wallet built with React Native, available on the app stores and on GitHub.
Double opt-in for email consent
Tamper-evident, GDPR-compliant documentation of email consents directly on the blockchain. Patented.
BlockPro — Carbon-Minus NFTs
Research project funded by the Free State of Bavaria for the certification of CO₂ removal on a blockchain basis.
Doichain Bridge & wDOI
1:1 backed representation of DOI as ERC-20 on Ethereum — mint / burn, multisig, proof-of-reserves. Whitepaper v0.2 (April 2026).
Post-quantum living lab
Stepwise rollout of ML-DSA, SLH-DSA, ML-KEM on a productive, Bitcoin-related blockchain. Three-phase plan 2026–2031.
Proof of existence as a service
A user-friendly application layer on top of native hash anchoring on Doichain — no crypto know-how required.
Decentralised identity & namespace address book
Self-managed address book via the 512-byte namespace layer: GPG keys, contact data, address linkages.
Carbon-minus beyond BlockPro
Translating the BlockPro pilot results into a broadly usable application for the certification of CO₂ removal.
Energy guarantees of origin
Tamper-evident documentation of the origin of clean energy — a specialisation of the proof-of-existence logic.
Layer-2 scaling
Higher transaction throughput without sacrificing the security of the main chain.
DEX connectivity via atomic swaps
Peer-to-peer trading without central custodians.
Further EVM chains
Connecting Polygon, Arbitrum and Base via established bridge standards.
sDOI on Solana
Parallel representation for the Solana ecosystem. A separate strategy paper is planned.
CampaignPlus
Commercial platform around double opt-in, with zero-knowledge proofs for GDPR-compliant regular operations in email marketing.
Doichain Name Service
Decentralised name registration via the namespace layer. Productive since the first Doichain release.
Doi.works · climate-neutral merged mining
Resource-friendly participation in merged mining under Bitcoin's hashrate. Productive mining infrastructure.
Utry.me
AI-supported FMCG market research. Doichain documents the results in a tamper-evident way and builds anonymous avatar pools.
Salesbutlers
AI messaging software with an immutable proof of existence for generated content.
ixchange.me · proof of existence
Decentralised proof of existence for inventions and ideas, tokenised via Doichain.
verifiles.it
Anonymous, secure storage of document fingerprints — tamper-evident online proof of existence.
Adaptive collaboration platform (noventive & fluid)
BSFZ-funded "operating system for intellectual property" — links physical patents via vectors and NFCs to the blockchain.
Doichain QR cashback
Loyalty programme: QR codes on product packaging → DOI coins as cashback. Pilot operations with selected brands.
Liquidity pools & DEX connectivity
Swap pools (e.g. DOI/USDT, wDOI/USDT) on decentralised exchanges, incl. arbitrage routes.
Rescue Flag · emergency pass
Emergency and identity system based on Doichain: a physical rescue flag with a QR code, linked to a GDPR-compliant digital emergency pass. Currently in pilot operation.
Architecture: Doichain ↔ Ethereum
Doichain and wDOI are two layers of the same undertaking. Doichain remains the sovereign mother chain — Bitcoin-related, secured by merged mining. wDOI is a 1:1 backed representation on Ethereum: mint on lock, burn on release, backed by multisig custody and proof-of-reserves.
Native DOI is held in a multisig address; signatures across several independent parties.
Lock on Doichain ⇒ mint of wDOI on Ethereum. Burn of wDOI ⇒ release of native DOI.
Publicly verifiable reconciliation: sum of wDOI on Ethereum = DOI held in custody on Doichain.
What you will not find here
No return promises.
The economic value of a token depends on many factors. A website is not the place where statements about it should be made — least of all by us.
"Not a "better than Bitcoin" narrative.
Doichain serves the Bitcoin ecosystem; it does not compete with it. Anyone looking for the opposite narrative is in the wrong place.
No blurring of product status.
What is productive is shown as productive. What is a pilot is shown as a pilot. That separation is not softened on any marketing slide.
Verify it yourself
Everything on this page is verifiable. The code is open, the blockchain has been running since 2018, the bridge whitepaper is public, the pilot projects are documented. We are not asking for trust, we are asking for scrutiny.
Frequently asked questions
A technology project deserves an introduction that is as precise as its code. What is written here is verifiable; what is not written here is not being hidden, it is simply not ready yet. Both belong to the seriousness of this project.
Note: This page is not a campaign page. The terms of the current wDOI issuance are stated exclusively at /en/wdoi.
This page does not constitute a public offer or investment advice. It describes the status of technological applications around Doichain and wDOI. Information about the current wDOI issuance and its terms is provided exclusively on the campaign page at /en/wdoi.