xCoin · MetalDAG · post-quantum from block 1
Learn to mine by mining.
Press start and this browser does real MetalDAG proof-of-work. The rehearsal is running on testnet A and the pool is mining it; when the pool publishes its browser endpoint, paste your address and the pool pays straight to your own key. When you want real hashrate, NerdMiner runs the same work natively on your Mac.
Network status
testnet A rehearsal · reading superknet.com
Live from the explorer at superknet.com. Mainnet genesis is not mined; these are rehearsal figures. Nothing here is simulated.
Paste a rehearsal address (txa1r…) to mine to the pool once its browser endpoint is published. Leave it blank to just try it (learn mode, no rewards). Get an address →
STATUS: the rehearsal is running on testnet A; the explorer at superknet.com is live and the pool is mining. Mainnet genesis is not mined. The pool’s browser endpoint is not published yet, so this page runs the learning benchmark: real MetalDAG work, no shares, no rewards. Rehearsal addresses read txa1r…, mainnet addresses xpa1r….
What your machine is actually doing
the whole thing, in four stepsGet a job
The pool hands your browser a block template: the last block's hash, the transactions to include, and a target the hash has to beat.
Walk the DAG
For every guess, MetalDAG reads 64 random 128-byte items from a dataset that starts at 4 GiB and grows 128 MiB every 14-day epoch, and mixes them. The cost is memory traffic, not arithmetic.
Submit shares
Any hash under the pool's easier target is a share: proof you did work. Shares are how the pool measures you.
Find a block
A hash under the network target is a block. The subsidy is 14 XCF in era 0 and halves every 750,000 blocks. The pool is solo and coinbase-only: the block pays its whole coinbase to the address that found it.
MetalDAG, plainly
Bitcoin's puzzle fits in 80 bytes, so a chip that does nothing but SHA-256 wins. MetalDAG makes the puzzle touch a 4 GiB dataset on every guess, and the dataset grows 128 MiB every 14-day epoch. It is memory-hard: the cost is memory traffic, not arithmetic.
That is the one thing Apple Silicon is world-class at: one pool of very fast memory shared by CPU and GPU. MetalDAG is memory-hard and Apple-Silicon-favoring; that is the whole claim. The full deep dive, with benchmarks.
Why this browser is slow, on purpose
The browser uses the light path: a 32 MiB verification cache and recomputing dataset items on demand. Real, correct, and far slower than the Mac app, which holds the whole dataset.
It exists so anyone can see mining happen without installing anything. When you want hashrate, the next section is for you.
Three ways in. Pick your level.
01 · Browser
This page. One tab, one click. The light path: a 32 MiB verification cache, nothing installed. Learn mode now; mine to your address once the pool opens.
Start above02 · NerdMiner for Mac
Native Mac miner. Mining needs the full DAG, 4 GiB at epoch 0, held in unified memory.
# paste your address; the pool address is published when the pool opens
./NerdMiner xpa1r… --pool <pool> --worker mymac
Get NerdMiner03 · Watch it anywhere
iPhone, Apple Watch, browser. NerdMiner MD in your toolbar, the iPhone app to start and stop your rig, and a buzz on your wrist when you find a block.
NerdMiner MDGet an address
Your address starts with xpa1r on mainnet and txa1r on the testnet A rehearsal. That prefix means post-quantum: every spend is signed with a post-quantum key — ML-DSA-65 or SLH-DSA-SHA2-128s — and the network rejects anything else. Nothing to migrate later.
xPay on iPhone makes one. Or the node's wallet, through nex-cli:
./nex-cli createwallet mine
./nex-cli getnewaddress → xpa1r… (mainnet)
Card wallets: an NTAG 424 DNA tap unlocks the key, which never touches a networked device.
Solo, coinbase-only
Solo is a lottery ticket. Rare, but a block is the whole subsidy, 14 XCF in era 0, and it is yours.
The pool is solo and coinbase-only: a block you find pays its coinbase straight to your address. No accounts, nothing held on your behalf, nothing split.
The pool is mining the testnet A rehearsal now. Its browser endpoint is published here when it opens.
NerdMiner MD. Your rig in the toolbar.
Chrome · Brave · Edge · FirefoxWatches the real miner
Your rig's hashrate in the badge, a desktop notification the moment you find a block, who's online at MineDifferent, and the #rigs chat. It does not mine in the browser. Your Mac does the work; this is the window.
Three steps
1 Run NerdMiner. It prints a companion token at startup.
2 chrome://extensions → Developer mode → Load unpacked → the nerdminer-md folder. Firefox: about:debugging → Load Temporary Add-on.
3 Options → paste the token. Stats appear in two seconds.
Sign in with your address
No passwords anywhere. Click Sign in, then run NerdMiner login <challenge> on your Mac. Your wallet signs a challenge with its post-quantum key. Chat unlocks after your first accepted share on the pool. Bots would have to mine to spam.