The cap is in the arithmetic.
The mint path stops paying once 21,000,000 have been issued. There is no branch that raises it, because there is no owner to call one.
Proof of work · live on Robinhood Chain
A 21,000,000 hard cap. Fifty a block, halving every 210,000. A difficulty that fights back as more machines arrive. The forge holds those rules and mints for nobody who has not done the hashing, including whoever deployed it.
The forge
| Block | Miner | Reward | Transaction |
|---|---|---|---|
|
No blocks yet Nothing has been hashed into existence. The first block is worth fifty, and it is sitting there unclaimed. Mine the first block |
|||
Retargets every 1,024 blocks to hold a minute apiece.
Halves every 210,000 blocks, exactly like Bitcoin.
0% of the 21,000,000 that will ever exist.
The issuance
Nothing was allocated, vested or reserved. Every unit that will ever exist has to be found by somebody hashing for it, on the same schedule Bitcoin uses.
The mint path stops paying once 21,000,000 have been issued. There is no branch that raises it, because there is no owner to call one.
Fifty a block to start, then twenty-five, then twelve and a half. A bit shift in the code, not a governance decision.
Every 1,024 blocks the target moves to drag the block time back toward a minute, clamped to a fourfold swing either way. That clamp is Bitcoin's own guard against a difficulty shock.
Mechanism
The contract does not trust your miner. It redoes the hash itself and mints only if the answer it computes is the one you claimed.
Read challengeNumber and miningTarget straight off the chain. Both change as soon as a block is found.
Hash the challenge, your address and a counter until the digest falls under the target. Your address is inside the preimage, so the solution is yours alone.
Send the nonce. The contract recomputes the digest, rejects anything above the target, credits the reward and rolls the challenge forward.
Open to anyone
One transaction, signed by your wallet, straight to the pons launcher, with the fee stream pointed somewhere better than a personal wallet.