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Figured out the reward scheme

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DcruBro
2026-04-01 11:56:09 +02:00
parent 075793c24c
commit 06e6f02b86
6 changed files with 172 additions and 56 deletions
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115
include/constants.h
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@@ -14,7 +14,18 @@
#define INITIAL_DIFFICULTY 0x1f0c1422 // Default compact target used by Autolykos2 PoW (This is ridiculously low)
//#define INITIAL_DIFFICULTY 0x1d1b7c51 // This takes 90s on my machine with a single thread, good for testing
#define INFLATION_PERCENTAGE_PER_EPOCH 15 // 1.5%
// Reward schedule acceleration: 1 means normal-speed progression.
#define EMISSION_ACCELERATION_FACTOR 1ULL
// Phase-one target horizon: emit ~2^64-1 atomic units by this many blocks at x1.
#define PHASE1_TARGET_BLOCKS 3000000ULL
// Inflation is expressed in tenths of a percent to preserve integer math.
#define INFLATION_PERCENTAGE_PER_EPOCH_TENTHS 15ULL // 1.5%
// Monero-style main emission: reward = (MONEY_SUPPLY - generated) >> speed factor.
// Keep this at 20 to match the canonical curve shape against a 2^64 atomic supply cap.
#define MONERO_EMISSION_SPEED_FACTOR 20U
// Future Autolykos2 constants:
#define EPOCH_LENGTH 350000 // ~1 year at 90s
@@ -35,32 +46,36 @@
* - Phase 2: Stable DAG growth (target is the max cap) to provide a stable environment for GPU miners, 320k blocks (roughly 11 months)
**/
static uint64_t currentReward = 0; // Global variable to track current block reward; updated with each block mined
static const uint64_t M_CAP = 18446744073709551615ULL; // Max uint64
static const uint64_t TAIL_EMISSION = DECIMALS; // Emission floor is 1.0 coins per block
static const uint64_t TAIL_EMISSION = 750000000000ULL; // 0.75 coins per block floor
static uint64_t currentReward = 750000000000ULL; // Epoch reward cache for phase 3
// No max supply. Instead of halving, it'll follow a more gradual, Monero-like emission curve.
static uint256_t currentSupply = {{0, 0, 0, 0}}; // Global variable to track total supply; updated with each block mined
// Call every epoch
// Phase 3: update once per effective epoch and keep a fixed per-block reward for that epoch.
static inline uint64_t GetInflationRateReward(uint256_t currentSupply, blockchain_t* chain) {
if (!chain || !chain->blocks) { return 0x00; } // Invalid
size_t height = Chain_Size(chain);
block_t* blk = (block_t*)Chain_GetBlock(chain, height - 1); // Last block
if (!blk) { return 0x00; } // Invalid
if (height % EPOCH_LENGTH == 0) {
// Calculate the new block reward (using all integer math to avoid floating point issues)
const uint64_t effectiveEpochLength =
(EPOCH_LENGTH / EMISSION_ACCELERATION_FACTOR) > 0
? (EPOCH_LENGTH / EMISSION_ACCELERATION_FACTOR)
: 1;
// 1. Multiply supply by 3
uint256_t multiplied = currentSupply;
uint256_t temp = currentSupply;
uint256_add(&multiplied, &temp); // currentSupply * 2
uint256_add(&multiplied, &temp); // currentSupply * 3
if (height == 0) {
currentReward = TAIL_EMISSION;
return currentReward;
}
if (height % effectiveEpochLength == 0) {
// inflationPerBlock = currentSupply * 1.5% / effectiveEpochLength
// = currentSupply * 15 / (1000 * effectiveEpochLength)
uint256_t multiplied = uint256_from_u64(0);
for (uint64_t i = 0; i < INFLATION_PERCENTAGE_PER_EPOCH_TENTHS; ++i) {
uint256_add(&multiplied, &currentSupply);
}
// 2. Divide by 70,000,000 using scalar short division
uint64_t divisor = 70000000ULL;
uint64_t divisor = 1000ULL * effectiveEpochLength;
uint256_t quotient = {{0, 0, 0, 0}};
unsigned __int128 remainder = 0;
@@ -71,43 +86,67 @@ static inline uint64_t GetInflationRateReward(uint256_t currentSupply, blockchai
remainder = current % divisor;
}
currentReward = quotient.limbs[0]; // Update the global reward variable with the new calculated reward for this epoch
return quotient.limbs[0]; // Return the least significant limb as the reward (the rest should be 0 for reasonable supply levels)
uint64_t inflationPerBlock = quotient.limbs[0];
currentReward = (inflationPerBlock > TAIL_EMISSION) ? inflationPerBlock : TAIL_EMISSION;
return currentReward;
}
return currentReward;
return (currentReward > TAIL_EMISSION) ? currentReward : TAIL_EMISSION;
}
static inline uint64_t CalculateBlockReward(uint256_t currentSupply, blockchain_t* chain) {
if (!chain || !chain->blocks) { return 0x00; } // Invalid
uint64_t height = Chain_Size(chain);
const uint64_t effectivePhase1Blocks =
(PHASE1_TARGET_BLOCKS / EMISSION_ACCELERATION_FACTOR) > 0
? (PHASE1_TARGET_BLOCKS / EMISSION_ACCELERATION_FACTOR)
: 1;
const uint64_t height = (uint64_t)Chain_Size(chain);
// After the phase-one target horizon, only floor/inflation schedule applies.
if (height >= effectivePhase1Blocks) {
return GetInflationRateReward(currentSupply, chain);
}
if (currentSupply.limbs[1] > 0 ||
currentSupply.limbs[2] > 0 ||
currentSupply.limbs[3] > 0 ||
currentSupply.limbs[0] >= M_CAP) {
return TAIL_EMISSION;
currentSupply.limbs[0] >= M_CAP)
{
// Post-Monero phase with unlimited supply: floor/inflation schedule only.
return GetInflationRateReward(currentSupply, chain);
}
uint64_t supply_64 = currentSupply.limbs[0];
// Formula: ((M - Supply) >> 20) * 181 / 256
// Use 128-bit intermediate to avoid overflow while preserving integer math.
__uint128_t rewardWide = (((__uint128_t)(M_CAP - supply_64) >> 20) * 181u) >> 8;
uint64_t reward = (rewardWide > UINT64_MAX) ? UINT64_MAX : (uint64_t)rewardWide;
// At a block time of ~90s and a floor of 1.0 coins, this will make a curve of ~8.5 years
const uint64_t generated = currentSupply.limbs[0];
const uint64_t remaining = M_CAP - generated;
// Check if the calculated reward has fallen below the floor
if (reward < TAIL_EMISSION) {
if (height < EPOCH_LENGTH * 10) { // Transitionary period to inflation of 1.5% per epoch
return TAIL_EMISSION;
} else {
return GetInflationRateReward(currentSupply, chain); // After the transitionary period, switch to the inflation-based reward
}
// Monero-style base curve against ~2^64 atomic-unit terminal supply.
uint64_t reward = remaining >> MONERO_EMISSION_SPEED_FACTOR;
// Acceleration preserves curve shape while reaching the floor sooner in block-height terms.
if (EMISSION_ACCELERATION_FACTOR > 1ULL && reward > 0ULL) {
__uint128_t accelerated = (__uint128_t)reward * (__uint128_t)EMISSION_ACCELERATION_FACTOR;
reward = (accelerated > (__uint128_t)remaining) ? remaining : (uint64_t)accelerated;
}
return reward;
// Retarget phase one to finish by PHASE1_TARGET_BLOCKS (x1), while keeping
// Monero-style behavior as the preferred curve when it is already sufficient.
const uint64_t blocksLeft = effectivePhase1Blocks - height;
const uint64_t minRewardToFinish = (remaining + blocksLeft - 1ULL) / blocksLeft; // ceil(remaining / blocksLeft)
if (reward < minRewardToFinish) {
reward = minRewardToFinish;
}
if (reward > remaining) {
reward = remaining;
}
// Phase 1 until Monero reward goes below the floor.
if (reward > TAIL_EMISSION) {
return reward;
}
// Phase 2 + 3: floor and epoch inflation updates.
return GetInflationRateReward(currentSupply, chain);
}
#endif