BTCFoundry
Mechanism $BTCF
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The contract,
in full.

Constants

name / symbol / decimals, BTC Foundry / BTCF / 8
MAX_SUPPLY, 21,000,000 (8 decimals, like Bitcoin)
INITIAL_REWARD, 50 BTCF
HALVING_INTERVAL, 210,000 blocks
RETARGET_INTERVAL, 1,024 blocks
TARGET_SECONDS, 60 s per block
MAX_TARGET / MIN_TARGET, 2234 / 216

Functions you will use

mint(uint256 nonce) · submit a solution; reverts unless the digest is under target
checkSolution(address,uint256) · view; returns the digest and whether it would be accepted
challengeNumber() · the 32 bytes you are hashing against right now
miningTarget() · the number your digest must not exceed
getMiningReward() · what the next block pays, after halvings
getMiningDifficulty() · MAX_TARGET / miningTarget, so 1 at genesis
epochCount() / tokensMinted() · blocks found, supply issued
plus the ordinary ERC-20 surface: balanceOf, transfer, approve, transferFrom

The hash, exactly

A miner must reproduce what the contract computes, byte for byte: 

digest = keccak256(abi.encodePacked(
    bytes32 challengeNumber,   // 32 bytes
    address msg.sender,        // 20 bytes
    uint256 nonce              // 32 bytes
))                             // 84 bytes packed, no padding

A block is any nonce where uint256(digest) ≤ miningTarget. The miner in this site verifies its own result against ethers and then against the chain before it ever asks your wallet to sign.

Status and risk

The contract compiles under solc 0.8.26 and has been run end to end on a local EVM: deploy, read the target, mine a nonce in JavaScript, submit it, and see the balance move from 0 to 50 BTCF, with a replay of the same nonce rejected. That test is the basis for saying it works. It is not an audit, and nobody has reviewed this code but its author.

It has not been deployed to Robinhood Chain yet. Until it is, this site shows a deploy panel instead of a live forge. Deploying costs gas and confers no privileges.

BTCF is mined, not sold. It is not Bitcoin, not backed by Bitcoin, and not redeemable for anything. It has no market, no liquidity and no promise of either.