Eddycoin Offline sandbox Eddycoin Testnet (sandbox)
Your own private copy of the three-chain sandbox. Sandbox keys (ECDSA P-256) are generated in your browser and stored only in localStorage – they are never real keys and never leave this page.
Exchange at the simulated rate
Counterparty: the sandbox exchange desk. Conversion fee 0.20 %. EDDY legs are signed Y-Chain transactions (network fee 0.01 EDDY); EUR/CZK legs move on the off-chain sandbox bank ledger.
Rate
Balances
| Wallet | EUR | CZK | EDDY (finalized) | EDDY (incl. pending) |
|---|
Wallet
Send EDDY
The transaction selects this wallet's UTXOs, adds a change output, and is signed with the wallet's sandbox ECDSA P-256 key. The Y-Chain checks signature, unspent inputs, value conservation and fee before accepting it.
Transaction history
Indicators (spec §18): E = E-Chain mining evidence, D = D-Chain mining evidence, Y = Y-Chain state confirmed in a finalized checkpoint. They describe evidence for the checkpoint, not three independent approvals; confirmations remain provisional/probabilistic.
| # | Type | Direction | Amount | Status | E D Y | Y height | Tx |
|---|
Open Y candidate
Both miners do real SHA-256 proof-of-work in your browser at 12 bits (a stand-in; RandomX and ETChash are not implemented). The in-browser "GPU" lane is simulated – it runs on the CPU (browsers cannot run the miner kernel). For real GPU compute use the downloadable OpenCL D-Chain miner on the Downloads page and import its results. A checkpoint is finalized only when both an E block and a D block commit to the same candidate. Reward: 10.00 EDDY per checkpoint, 50 % E / 50 % D, plus fees; cap 900,000,000 EDDY.
External work credits
Imported miner result files (from the downloadable Python miners) are verified and queued as credits. Each credit receives the E- or D-lane share of one future checkpoint reward, paid via Y to Party A or B.
Y-Chain Registry all exchanges, transfers, rewards, imports and rejected attempts
re-checks signatures, double spends, value conservation, issuance cap and checkpoint links
| # | Tx id | Type | From → To | Amount | Fee | Status | Sig | UTXO | Y height | Result |
|---|
Import
Accepted: eddycoin_echain_results.json, eddycoin_dchain_results.json (from the miners) and eddycoin_ychain_verified.json (from the verifier). Files are checked here with the same rules as the Python verifier: checksum, every block hash against its difficulty target, prev-hash links, and E/D pairing into Y checkpoints.
Export
Downloads eddycoin_chain_export.json with the E, D and Y chains and the Y registry (public keys only – no private keys). Check it offline with py eddycoin_ychain_verifier.py --chain-export eddycoin_chain_export.json. Download the verifier and miners.