Difficulty Adjustment
AgentCoin uses Bitcoin-style adaptive difficulty to maintain a consistent mining rate regardless of how many miners are active. The mechanism ensures predictable token emission, whether there are 10 miners or 10,000.
How It Works
The difficulty adjustment runs every 64 mines. It compares the actual time taken (in blocks) against the expected time, then scales the mining target accordingly.
Parameters
| Parameter | Value | Description |
|---|---|---|
ADJUSTMENT_INTERVAL | 64 mines | How often difficulty recalibrates |
TARGET_BLOCK_INTERVAL | 5 blocks | Target gap between mines (~10s on Base) |
| Expected blocks per cycle | 320 | 64 mines x 5 blocks |
Algorithm
expectedBlocks = 64 * 5 = 320
actualBlocks = currentBlock - lastAdjustmentBlock
// Clamp to [0.5x, 2x] band
actualBlocks = clamp(actualBlocks, 160, 640)
// Scale target proportionally
newTarget = miningTarget * actualBlocks / expectedBlocksAdjustment Scenarios
Mining Too Fast
More miners join the network. Mines happen every block instead of every 5.
64 mines in 64 blocks (expected: 320)
→ Clamped to 160 (minimum)
→ newTarget = target * 160 / 320 = target / 2
→ Difficulty doubles (target halves)Result: Harder to find a valid hash. Mining slows back toward 1 per 5 blocks.
Mining Too Slow
Miners leave the network. Only a few mines per hour.
64 mines in 1280 blocks (expected: 320)
→ Clamped to 640 (maximum)
→ newTarget = target * 640 / 320 = target * 2
→ Difficulty halves (target doubles)Result: Easier to find a valid hash. Mining speeds back up toward 1 per 5 blocks.
Mining at Target Rate
Network is in equilibrium. Mines happen every ~5 blocks.
64 mines in 320 blocks (expected: 320)
→ newTarget = target * 320 / 320 = target
→ No changeSafety Clamps
The adjustment is bounded to prevent extreme swings:
| Bound | Multiplier | Purpose |
|---|---|---|
| Minimum (0.5x) | Target can at most halve | Prevents difficulty from spiking to impossible levels |
| Maximum (2x) | Target can at most double | Prevents difficulty from dropping to trivial levels |
| Floor (1) | Target never reaches zero | Ensures mining is always theoretically possible |
These clamps mean it takes multiple adjustment cycles to respond to large changes in mining participation, providing stability.
Comparison to Bitcoin
| Property | Bitcoin | AgentCoin |
|---|---|---|
| Adjustment interval | 2,016 blocks (~2 weeks) | 64 mines |
| Target rate | 1 block per 10 minutes | 1 mine per 5 blocks (~10s) |
| Clamp range | 0.25x – 4x | 0.5x – 2x |
| Hash algorithm | SHA-256 (double) | Keccak-256 (SHA-3) |
| Difficulty representation | Target hash | Target integer |
AgentCoin adjusts faster (every 64 mines vs every 2,016 blocks) with tighter clamps, appropriate for a faster-moving L2 environment.
Why This Matters
Without difficulty adjustment, token emission would be unpredictable:
- Too easy: A bot farm could drain millions of AGENT in hours
- Too hard: The chain goes dead, no one can mine
- Variable: Emission rate swings wildly with miner count
The adjustment mechanism guarantees that $AGENT is emitted at a steady, predictable rate (approximately one mine every 10 seconds) regardless of network conditions. This makes the tokenomics deterministic and trustworthy.