Eddycoin One unit between two currencies
Eddycoin (ticker EDDY) is an experimental concept for a currency that sits between two parties and their home currencies – in the spirit of a "euro-dollar". This page explains the idea; the sandbox lets you try it with simulated balances and a simulated exchange rate.
The idea
Party A holds EUR
For example a person or business whose costs and income are in euro.
Party B holds CZK
A counterparty whose home currency is the Czech koruna (any pair would work – EUR/CZK is just the demo example).
EDDY sits in the middle
One EDDY is defined as a fixed basket of both currencies, so its value lies halfway between them. Neither side carries the full currency move alone.
How the rate works in the demo
1. Simulated EUR/CZK rate
The sandbox starts at a reference rate of 25.0000 CZK per EUR and then moves it with a small random walk every few seconds (roughly ±0.05 % per step, kept within 22–28). This is not live market data.
2. EDDY = basket of the pair
At genesis, 1 EDDY was set equal to half a euro plus half a euro's worth of koruna. Those quantities stay fixed:
If EUR/CZK moves by +1 %, EDDY moves by about +0.5 % against CZK and −0.5 % against EUR – it is the midpoint of the pair.
3. Exchange between the parties
Each party can convert between EUR, CZK and EDDY at the current simulated rate, and send any of the three to the other party. A small simulated fee (0.20 % on conversions) goes to a sandbox fee pool, so you can see how costs would accumulate.
4. Exact accounting
All balances are stored as whole minor units (euro cents, hellers, EDDY hundredths) and converted with integer arithmetic, so there are no floating-point rounding errors. Everything is kept only in your browser (localStorage) and can be reset at any time.
Emission schedule
There is no premine and no faucet: EDDY is created only as the reward of a finalized Y checkpoint (one E-Chain CPU block + one D-Chain GPU block), split 50/50 between the two miners. The reward starts at 149.85005307 EDDY per checkpoint and is multiplied by 998335/1000000 every 10,000 checkpoints (≈ 3.5 days) – a smooth decline with a half-life of about 4 years and a long tail of fractions of an EDDY (8 decimals). The cumulative supply reaches exactly 900,000,000 EDDY at checkpoint 105,217,827 (≈ year 100 at one checkpoint per 30 s); after that miners earn fees only. Integer math only – the same function runs in the server, the browser sandbox and the Python verifier.
| Year | Reward / checkpoint | Cumulative |
|---|---|---|
| 1 | 125.79636398 | 144,708,127 (16.1 %) |
| 10 | 26.00429270 | 744,057,588 (82.7 %) |
| 25 | 1.87517208 | 888,752,946 (98.75 %) |
| 50 | 0.02342328 | 899,859,620 (99.98 %) |
| 75 | 0.00028966 | 899,998,342 |
| 90 | 0.00001802 | 899,999,925 |
| 100 | 0.00000048 | 899,999,999.98786 → 900,000,000 at ≈ year 100.02 |
Difficulty is independent of the emission: each chain retargets every 10 blocks toward 30 s per block, so when more hash power joins, mining gets harder and the issuance pace stays on schedule.
Longer-term technical direction
A separate draft specification, "EDDY – Complete Triple-Chain Technical Architecture, v1.0", describes a possible future network design:
- E-Chain (Euro chain) – CPU-oriented proof-of-work (RandomX).
- D-Chain (Dollar chain) – GPU-oriented proof-of-work (ETChash).
- Y-Chain (EDDY chain) – the shared ledger of balances and transfers, finalized by checkpoints that reference work from both mining chains.
That design is a proposal only: it is not implemented and not audited, and many critical questions (fork choice, checkpoint finalization, comparing CPU and GPU work) are still open. The sandbox includes a tiny visual simulation of the three chains using a simple SHA-256 stand-in; it does not run RandomX or ETChash and has no network.
Important – please read
- This is a concept page and a sandbox demo. No real money, no real currency and no real tokens are involved. Nothing can be bought, sold, deposited or withdrawn.
- EDDY is not a financial product, not an investment and not an offer of securities or any other financial instrument. Nothing here is financial, legal or tax advice.
- The exchange rate shown in the demo is simulated and is not market data. No value, price stability or return of any kind is promised or implied.
- No security claims are made. The architecture is experimental and has not been reviewed or audited.
- The site collects no data: there are no forms, accounts, cookies or analytics. Demo state stays in your own browser.