Basics
A sober briefing: origins, shared codebase with Bitcoin, merged mining, tokenomics, namespace layer — and what can actually be done with it.
Bitcoin → Namecoin → Doichain
Bitcoin ↔ Doichain
Doichain shares Bitcoin's cryptographic primitives, tokenomics and consensus mechanism. It adds a namespace layer and is already in productive use.
| Property | Bitcoin | Doichain |
|---|---|---|
| Consensus | Proof of Work (Nakamoto) | Proof of Work (Nakamoto) |
| Block time | ~10 minutes | ~10 minutes |
| Supply | 21M BTC | 21M DOI |
| Halving | every 210,000 blocks | every 210,000 blocks |
| Hash algorithm | SHA-256 | SHA-256 (merged mining) |
| Signature | ECDSA / secp256k1 | ECDSA / secp256k1 (PQC in the living lab) |
| Namespace layer | — | 512 bytes per operation |
| Productive applications | Store of value, payments | 20+ real applications, pilots and projects (DOI, PoE, ID, energy…) |
One PoW, two block strands
ASIC miners compute a single proof-of-work that simultaneously secures Bitcoin and Doichain. The concept goes back to Satoshi Nakamoto himself (BitcoinTalk, December 2010); Namecoin provided the proof of concept in 2011, and Doichain has been using it productively since 2018.
From the block to the application
In addition to the transaction layer, Doichain has a namespace layer: up to 512 bytes per operation. It is the technical foundation for consents, proofs of existence and decentralised identity.
Every namespace operation is a special transaction inside a regular block. In the 512-byte payload one can anchor consents, document hashes, identity attributes or asset references.
What can you do with it?
Four concrete examples drawn from live operations — no whitepaper promises, only documented applications.
Go deeper
The basics are the prerequisite — the full reach becomes clear in the living-lab concept and in the concrete applications.