Protocol tool
Pearl emission explorer, block by block.
Pearl caps supply at 2.1 billion PRL and shrinks the reward a little with every block, instead of halving it every four years. See the whole curve, then look up any block.
- Runs in your browser
- Uses the consensus formula
Share of the 2.1 billion PRL issued
Reward per block (PRL)
Issued: 50% by year 4 · 75% by year 12 · 87.5% by year 28
Look up a block
Exact consensus arithmetic, in grains- Reward of this block
- 2,232.5931 PRL
- 223,259,314,694 grains
- Total issued by this block
- 353,991,599 PRL
- 16.857% of the cap
- Still to be issued
- 1,746,008,401 PRL
- approaches zero, never reaches it
- Nominal time since launch
- 0.81 years
- at the 194-second target
So far blocks have arrived faster than the target: block 131,829 came about 178 days after genesis, an average of 117 seconds per block. Nominal years therefore run ahead of the calendar.
Milestones
Where the curve crosses each share of the supply| Issued | At block | Nominal year | Reward, PRL |
|---|---|---|---|
| 10% | 72,248 year 0.4 | 0.4 | 2,616.01 |
| 25% | 216,742 year 1.3 | 1.3 | 1,816.68 |
| 50% | 650,226 year 4.0 | 4.0 | 807.41 |
| 75% | 1,950,678 year 12.0 | 12.0 | 201.85 |
| 90% | 5,852,034 year 36.0 | 36.0 | 32.30 |
| 95% | 12,354,294 year 76.0 | 76.0 | 8.07 |
| 99% | 64,372,374 year 396.0 | 396.0 | 0.32 |
How it’s calculated
One formula, rounded to the grain.
floor(S × C ÷ ((h + C) × (h − 1 + C)))
S is the supply in grains (2.1 billion × 100,000,000) and C = 650,226, four years of 194-second blocks. This is CalcBlockSubsidy in the node’s code; block 0 pays nothing.
2,100,000,000 × h ÷ (h + 650,226) PRL
The per-block rewards add up to this, less under one grain of rounding per block.
Transaction fees come on top of the reward and aren’t part of the supply curve.
Things worth noticing
Halving, without the cliff.
- The first block paid 3,229.64 PRL. A Bitcoin-style schedule with the same cap and rhythm would have paid half that, then dropped in steps.
- At year 4 the two schedules meet: both pay 807.41 PRL per block, and both have issued exactly half the supply.
- What remains unissued halves at year 4, again at year 12 and again at year 28: each halving takes twice as long as the last, and none happens overnight.
- Miners never face a sudden 50% pay cut on one block, which smooths the incentive to keep securing the network.