Copy // Copyright 2025 R5
// This file is part of the R5 Core library.
//
// This software is provided "as is", without warranty of any kind,
// express or implied, including but not limited to the warranties
// of merchantability, fitness for a particular purpose and
// noninfringement. In no event shall the authors or copyright
// holders be liable for any claim, damages, or other liability,
// whether in an action of contract, tort or otherwise, arising
// from, out of or in connection with the software or the use or
// other dealings in the software.
// ETHASH-R5 Implementation
// --------------------------------------------------------------
// Visit https://r5.network for more information
// Miner software developers should adjust for the 4 extra mixing
// rounds to generate correct hashes. Regular ETHASH miners won't
// work with ETHASH-R5 if not adjusted accordingly.
// --------------------------------------------------------------
package ethash
import (
"encoding/binary"
"hash"
"math/big"
"reflect"
"runtime"
"sync"
"sync/atomic"
"time"
"unsafe"
"github.com/r5-labs/r5-core/common"
"github.com/r5-labs/r5-core/common/bitutil"
"github.com/r5-labs/r5-core/crypto"
"github.com/r5-labs/r5-core/log"
"golang.org/x/crypto/sha3"
)
const (
datasetInitBytes = 1 << 30 // Bytes in dataset at genesis
datasetGrowthBytes = 1 << 23 // Dataset growth per epoch
cacheInitBytes = 1 << 24 // Bytes in cache at genesis
cacheGrowthBytes = 1 << 17 // Cache growth per epoch
epochLength = 30000 // Blocks per epoch
mixBytes = 128 // Width of mix
hashBytes = 64 // Hash length in bytes
hashWords = 16 // Number of 32 bit ints in a hash
datasetParents = 256 // Number of parents of each dataset element
cacheRounds = 3 // Number of rounds in cache production
loopAccesses = 64 // Number of accesses in hashimoto loop
)
// cacheSize returns the size of the ethash verification cache that belongs to a certain
// block number.
func cacheSize(block uint64) uint64 {
epoch := int(block / epochLength)
if epoch < maxEpoch {
return cacheSizes[epoch]
}
return calcCacheSize(epoch)
}
// calcCacheSize calculates the cache size for epoch. The cache size grows linearly,
// however, we always take the highest prime below the linearly growing threshold in order
// to reduce the risk of accidental regularities leading to cyclic behavior.
func calcCacheSize(epoch int) uint64 {
size := cacheInitBytes + cacheGrowthBytes*uint64(epoch) - hashBytes
for !new(big.Int).SetUint64(size / hashBytes).ProbablyPrime(1) { // Always accurate for n < 2^64
size -= 2 * hashBytes
}
return size
}
// datasetSize returns the size of the ethash mining dataset that belongs to a certain
// block number.
func datasetSize(block uint64) uint64 {
epoch := int(block / epochLength)
if epoch < maxEpoch {
return datasetSizes[epoch]
}
return calcDatasetSize(epoch)
}
// calcDatasetSize calculates the dataset size for epoch. The dataset size grows linearly,
// however, we always take the highest prime below the linearly growing threshold in order
// to reduce the risk of accidental regularities leading to cyclic behavior.
func calcDatasetSize(epoch int) uint64 {
size := datasetInitBytes + datasetGrowthBytes*uint64(epoch) - mixBytes
for !new(big.Int).SetUint64(size / mixBytes).ProbablyPrime(1) { // Always accurate for n < 2^64
size -= 2 * mixBytes
}
return size
}
// hasher is a repetitive hasher allowing the same hash data structures to be
// reused between hash runs instead of requiring new ones to be created.
type hasher func(dest []byte, data []byte)
// makeHasher creates a repetitive hasher, allowing the same hash data structures to
// be reused between hash runs instead of requiring new ones to be created. The returned
// function is not thread safe!
func makeHasher(h hash.Hash) hasher {
// sha3.state supports Read to get the sum, use it to avoid the overhead of Sum.
// Read alters the state but we reset the hash before every operation.
type readerHash interface {
hash.Hash
Read([]byte) (int, error)
}
rh, ok := h.(readerHash)
if !ok {
panic("can't find Read method on hash")
}
outputLen := rh.Size()
return func(dest []byte, data []byte) {
rh.Reset()
rh.Write(data)
rh.Read(dest[:outputLen])
}
}
// seedHash is the seed to use for generating a verification cache and the mining
// dataset.
func seedHash(block uint64) []byte {
seed := make([]byte, 32)
if block < epochLength {
return seed
}
keccak256 := makeHasher(sha3.NewLegacyKeccak256())
for i := 0; i < int(block/epochLength); i++ {
keccak256(seed, seed)
}
return seed
}
// generateCache creates a verification cache of a given size for an input seed.
// The cache production process involves first sequentially filling up 32 MB of
// memory, then performing two passes of Sergio Demian Lerner's RandMemoHash
// algorithm from Strict Memory Hard Hashing Functions (2014). The output is a
// set of 524288 64-byte values.
// This method places the result into dest in machine byte order.
func generateCache(dest []uint32, epoch uint64, seed []byte) {
// Print some debug logs to allow analysis on low end devices
logger := log.New("epoch", epoch)
start := time.Now()
defer func() {
elapsed := time.Since(start)
logFn := logger.Debug
if elapsed > 3*time.Second {
logFn = logger.Info
}
logFn("Generated ethash verification cache", "elapsed", common.PrettyDuration(elapsed))
}()
// Convert our destination slice to a byte buffer
var cache []byte
cacheHdr := (*reflect.SliceHeader)(unsafe.Pointer(&cache))
dstHdr := (*reflect.SliceHeader)(unsafe.Pointer(&dest))
cacheHdr.Data = dstHdr.Data
cacheHdr.Len = dstHdr.Len * 4
cacheHdr.Cap = dstHdr.Cap * 4
// Calculate the number of theoretical rows (we'll store in one buffer nonetheless)
size := uint64(len(cache))
rows := int(size) / hashBytes
// Start a monitoring goroutine to report progress on low end devices
var progress atomic.Uint32
done := make(chan struct{})
defer close(done)
go func() {
for {
select {
case <-done:
return
case <-time.After(3 * time.Second):
logger.Info("Generating ethash verification cache", "percentage", progress.Load()*100/uint32(rows)/(cacheRounds+1), "elapsed", common.PrettyDuration(time.Since(start)))
}
}
}()
// Create a hasher to reuse between invocations
keccak512 := makeHasher(sha3.NewLegacyKeccak512())
// Sequentially produce the initial dataset
keccak512(cache, seed)
for offset := uint64(hashBytes); offset < size; offset += hashBytes {
keccak512(cache[offset:], cache[offset-hashBytes:offset])
progress.Add(1)
}
// Use a low-round version of randmemohash
temp := make([]byte, hashBytes)
for i := 0; i < cacheRounds; i++ {
for j := 0; j < rows; j++ {
var (
srcOff = ((j - 1 + rows) % rows) * hashBytes
dstOff = j * hashBytes
xorOff = (binary.LittleEndian.Uint32(cache[dstOff:]) % uint32(rows)) * hashBytes
)
bitutil.XORBytes(temp, cache[srcOff:srcOff+hashBytes], cache[xorOff:xorOff+hashBytes])
keccak512(cache[dstOff:], temp)
progress.Add(1)
}
}
// Swap the byte order on big endian systems and return
if !isLittleEndian() {
swap(cache)
}
}
// swap changes the byte order of the buffer assuming a uint32 representation.
func swap(buffer []byte) {
for i := 0; i < len(buffer); i += 4 {
binary.BigEndian.PutUint32(buffer[i:], binary.LittleEndian.Uint32(buffer[i:]))
}
}
// fnv is an algorithm inspired by the FNV hash, which in some cases is used as
// a non-associative substitute for XOR. Note that we multiply the prime with
// the full 32-bit input, in contrast with the FNV-1 spec which multiplies the
// prime with one byte (octet) in turn.
func fnv(a, b uint32) uint32 {
return a*0x01000193 ^ b
}
// fnvHash mixes in data into mix using the ethash fnv method.
func fnvHash(mix []uint32, data []uint32) {
for i := 0; i < len(mix); i++ {
mix[i] = mix[i]*0x01000193 ^ data[i]
}
}
// generateDatasetItem combines data from 256 pseudorandomly selected cache nodes,
// and hashes that to compute a single dataset node.
func generateDatasetItem(cache []uint32, index uint32, keccak512 hasher) []byte {
// Calculate the number of theoretical rows (we use one buffer nonetheless)
rows := uint32(len(cache) / hashWords)
// Initialize the mix
mix := make([]byte, hashBytes)
binary.LittleEndian.PutUint32(mix, cache[(index%rows)*hashWords]^index)
for i := 1; i < hashWords; i++ {
binary.LittleEndian.PutUint32(mix[i*4:], cache[(index%rows)*hashWords+uint32(i)])
}
keccak512(mix, mix)
// Convert the mix to uint32s to avoid constant bit shifting
intMix := make([]uint32, hashWords)
for i := 0; i < len(intMix); i++ {
intMix[i] = binary.LittleEndian.Uint32(mix[i*4:])
}
// fnv it with a lot of random cache nodes based on index
for i := uint32(0); i < datasetParents; i++ {
parent := fnv(index^i, intMix[i%16]) % rows
fnvHash(intMix, cache[parent*hashWords:])
}
// Flatten the uint32 mix into a binary one and return
for i, val := range intMix {
binary.LittleEndian.PutUint32(mix[i*4:], val)
}
keccak512(mix, mix)
return mix
}
// generateDataset generates the entire ethash dataset for mining.
// This method places the result into dest in machine byte order.
func generateDataset(dest []uint32, epoch uint64, cache []uint32) {
// Print some debug logs to allow analysis on low end devices
logger := log.New("epoch", epoch)
start := time.Now()
defer func() {
elapsed := time.Since(start)
logFn := logger.Debug
if elapsed > 3*time.Second {
logFn = logger.Info
}
logFn("Generated ethash verification cache", "elapsed", common.PrettyDuration(elapsed))
}()
// Figure out whether the bytes need to be swapped for the machine
swapped := !isLittleEndian()
// Convert our destination slice to a byte buffer
var dataset []byte
datasetHdr := (*reflect.SliceHeader)(unsafe.Pointer(&dataset))
destHdr := (*reflect.SliceHeader)(unsafe.Pointer(&dest))
datasetHdr.Data = destHdr.Data
datasetHdr.Len = destHdr.Len * 4
datasetHdr.Cap = destHdr.Cap * 4
// Generate the dataset on many goroutines since it takes a while
threads := runtime.NumCPU()
size := uint64(len(dataset))
var pend sync.WaitGroup
pend.Add(threads)
var progress atomic.Uint64
for i := 0; i < threads; i++ {
go func(id int) {
defer pend.Done()
// Create a hasher to reuse between invocations
keccak512 := makeHasher(sha3.NewLegacyKeccak512())
// Calculate the data segment this thread should generate
batch := (size + hashBytes*uint64(threads) - 1) / (hashBytes * uint64(threads))
first := uint64(id) * batch
limit := first + batch
if limit > size/hashBytes {
limit = size / hashBytes
}
// Calculate the dataset segment
percent := size / hashBytes / 100
for index := first; index < limit; index++ {
item := generateDatasetItem(cache, uint32(index), keccak512)
if swapped {
swap(item)
}
copy(dataset[index*hashBytes:], item)
if status := progress.Add(1); status%percent == 0 {
logger.Info("Generating DAG in progress", "percentage", (status*100)/(size/hashBytes), "elapsed", common.PrettyDuration(time.Since(start)))
}
}
}(i)
}
// Wait for all the generators to finish and return
pend.Wait()
}
// hashimoto aggregates data from the full dataset in order to produce our final
// value for a particular header hash and nonce.
func hashimoto(hash []byte, nonce uint64, size uint64, lookup func(index uint32) []uint32) ([]byte, []byte) {
// 1. Standard Hashimoto (inherited from standard Ethash) with extra sequential dependency
rows := uint32(size / mixBytes)
// Combine header+nonce into a 40-byte seed
seed := make([]byte, 40)
copy(seed, hash)
binary.LittleEndian.PutUint64(seed[32:], nonce)
// Keccak-512 of the seed
seed = crypto.Keccak512(seed)
seedHead := binary.LittleEndian.Uint32(seed)
// Initialize the mix: replicate the 512-bit seed across mix
mix := make([]uint32, mixBytes/4)
for i := 0; i < len(mix); i++ {
mix[i] = binary.LittleEndian.Uint32(seed[(i%16)*4:])
}
// Main loop: add sequential dependency and a conditional branch to hinder GPU parallelism
temp := make([]uint32, len(mix))
// Start with a sequential dependency variable initialized from seedHead.
seqDep := seedHead
for i := 0; i < loopAccesses; i++ {
// Update the sequential dependency with a value from mix.
seqDep = fnv(seqDep, mix[i%len(mix)])
// Use seqDep (instead of seedHead) to calculate parent index.
parent := fnv(uint32(i)^seqDep, mix[i%len(mix)]) % rows
for j := uint32(0); j < mixBytes/hashBytes; j++ {
copy(temp[j*hashWords:], lookup(2*parent+j))
}
// Insert a data-dependent branch to force divergence:
if (mix[0] & 0x1) == 1 {
// Extra mixing on the first element to force serial dependency.
mix[0] = fnv(mix[0], temp[0])
}
fnvHash(mix, temp)
}
// Compress mix to a 32-byte digest.
for i := 0; i < len(mix); i += 4 {
mix[i/4] = fnv(fnv(fnv(mix[i], mix[i+1]), mix[i+2]), mix[i+3])
}
mix = mix[:len(mix)/4]
digest := make([]byte, 32)
for i, val := range mix {
binary.LittleEndian.PutUint32(digest[i*4:], val)
}
// 2. Ethash-R5 extension: four extra mixing rounds with added sequential work
// (Keccak256 ∘ FNV_Mix)^4 applied to the digest
extraKeccak := makeHasher(sha3.NewLegacyKeccak256())
for round := 0; round < 4; round++ {
// Interpret digest as array of uint32
extra := make([]uint32, len(digest)/4)
for i := 0; i < len(extra); i++ {
extra[i] = binary.LittleEndian.Uint32(digest[i*4:])
}
// Add a sequential inner loop to further force serial computation.
for k := 0; k < 3; k++ {
extra[0] = fnv(extra[0], extra[len(extra)-1])
}
// FNV-mix the array with itself
fnvHash(extra, extra)
// Convert back to bytes
for i, val := range extra {
binary.LittleEndian.PutUint32(digest[i*4:], val)
}
// Data-dependent branch: if the least significant bit of digest[0] is 0, perform an extra Keccak mix.
if (digest[0] & 1) == 0 {
tmp := make([]byte, len(digest))
extraKeccak(tmp, digest)
copy(digest, tmp)
}
}
// -----------------------------------------------------------------------
// 3. Final hash remains the same: Keccak256(seed || digest)
// -----------------------------------------------------------------------
finalHash := crypto.Keccak256(append(seed, digest...))
return digest, finalHash
}
// hashimotoLight aggregates data from the full dataset (using only a small
// in-memory cache) in order to produce our final value for a particular header
// hash and nonce.
func hashimotoLight(size uint64, cache []uint32, hash []byte, nonce uint64) ([]byte, []byte) {
keccak512 := makeHasher(sha3.NewLegacyKeccak512())
lookup := func(index uint32) []uint32 {
rawData := generateDatasetItem(cache, index, keccak512)
data := make([]uint32, len(rawData)/4)
for i := 0; i < len(data); i++ {
data[i] = binary.LittleEndian.Uint32(rawData[i*4:])
}
return data
}
return hashimoto(hash, nonce, size, lookup)
}
// hashimotoFull aggregates data from the full dataset (using the full in-memory
// dataset) in order to produce our final value for a particular header hash and
// nonce.
func hashimotoFull(dataset []uint32, hash []byte, nonce uint64) ([]byte, []byte) {
lookup := func(index uint32) []uint32 {
offset := index * hashWords
return dataset[offset : offset+hashWords]
}
return hashimoto(hash, nonce, uint64(len(dataset))*4, lookup)
}
const maxEpoch = 2048
// datasetSizes is a lookup table for the ethash dataset size for the first 2048
// epochs (i.e. 61440000 blocks).
var datasetSizes = [maxEpoch]uint64{
1073739904, 1082130304, 1090514816, 1098906752, 1107293056,
1115684224, 1124070016, 1132461952, 1140849536, 1149232768,
1157627776, 1166013824, 1174404736, 1182786944, 1191180416,
1199568512, 1207958912, 1216345216, 1224732032, 1233124736,
1241513344, 1249902464, 1258290304, 1266673792, 1275067264,
1283453312, 1291844992, 1300234112, 1308619904, 1317010048,
1325397376, 1333787776, 1342176128, 1350561664, 1358954368,
1367339392, 1375731584, 1384118144, 1392507008, 1400897408,
1409284736, 1417673344, 1426062464, 1434451072, 1442839168,
1451229056, 1459615616, 1468006016, 1476394112, 1484782976,
1493171584, 1501559168, 1509948032, 1518337664, 1526726528,
1535114624, 1543503488, 1551892096, 1560278656, 1568669056,
1577056384, 1585446272, 1593831296, 1602219392, 1610610304,
1619000192, 1627386752, 1635773824, 1644164224, 1652555648,
1660943488, 1669332608, 1677721216, 1686109312, 1694497664,
1702886272, 1711274624, 1719661184, 1728047744, 1736434816,
1744829056, 1753218944, 1761606272, 1769995904, 1778382464,
1786772864, 1795157888, 1803550592, 1811937664, 1820327552,
1828711552, 1837102976, 1845488768, 1853879936, 1862269312,
1870656896, 1879048064, 1887431552, 1895825024, 1904212096,
1912601216, 1920988544, 1929379456, 1937765504, 1946156672,
1954543232, 1962932096, 1971321728, 1979707264, 1988093056,
1996487552, 2004874624, 2013262208, 2021653888, 2030039936,
2038430848, 2046819968, 2055208576, 2063596672, 2071981952,
2080373632, 2088762752, 2097149056, 2105539712, 2113928576,
2122315136, 2130700672, 2139092608, 2147483264, 2155872128,
2164257664, 2172642176, 2181035392, 2189426048, 2197814912,
2206203008, 2214587264, 2222979712, 2231367808, 2239758208,
2248145024, 2256527744, 2264922752, 2273312128, 2281701248,
2290086272, 2298476672, 2306867072, 2315251072, 2323639168,
2332032128, 2340420224, 2348808064, 2357196416, 2365580416,
2373966976, 2382363008, 2390748544, 2399139968, 2407530368,
2415918976, 2424307328, 2432695424, 2441084288, 2449472384,
2457861248, 2466247808, 2474637184, 2483026816, 2491414144,
2499803776, 2508191872, 2516582272, 2524970368, 2533359232,
2541743488, 2550134144, 2558525056, 2566913408, 2575301504,
2583686528, 2592073856, 2600467328, 2608856192, 2617240448,
2625631616, 2634022016, 2642407552, 2650796416, 2659188352,
2667574912, 2675965312, 2684352896, 2692738688, 2701130624,
2709518464, 2717907328, 2726293376, 2734685056, 2743073152,
2751462016, 2759851648, 2768232832, 2776625536, 2785017728,
2793401984, 2801794432, 2810182016, 2818571648, 2826959488,
2835349376, 2843734144, 2852121472, 2860514432, 2868900992,
2877286784, 2885676928, 2894069632, 2902451584, 2910843008,
2919234688, 2927622784, 2936011648, 2944400768, 2952789376,
2961177728, 2969565568, 2977951616, 2986338944, 2994731392,
3003120256, 3011508352, 3019895936, 3028287104, 3036675968,
3045063808, 3053452928, 3061837696, 3070228352, 3078615424,
3087003776, 3095394944, 3103782272, 3112173184, 3120562048,
3128944768, 3137339264, 3145725056, 3154109312, 3162505088,
3170893184, 3179280256, 3187669376, 3196056704, 3204445568,
3212836736, 3221224064, 3229612928, 3238002304, 3246391168,
3254778496, 3263165824, 3271556224, 3279944576, 3288332416,
3296719232, 3305110912, 3313500032, 3321887104, 3330273152,
3338658944, 3347053184, 3355440512, 3363827072, 3372220288,
3380608384, 3388997504, 3397384576, 3405774208, 3414163072,
3422551936, 3430937984, 3439328384, 3447714176, 3456104576,
3464493952, 3472883584, 3481268864, 3489655168, 3498048896,
3506434432, 3514826368, 3523213952, 3531603584, 3539987072,
3548380288, 3556763264, 3565157248, 3573545344, 3581934464,
3590324096, 3598712704, 3607098752, 3615488384, 3623877248,
3632265856, 3640646528, 3649043584, 3657430144, 3665821568,
3674207872, 3682597504, 3690984832, 3699367808, 3707764352,
3716152448, 3724541056, 3732925568, 3741318016, 3749706368,
3758091136, 3766481536, 3774872704, 3783260032, 3791650432,
3800036224, 3808427648, 3816815488, 3825204608, 3833592704,
3841981568, 3850370432, 3858755968, 3867147904, 3875536256,
3883920512, 3892313728, 3900702592, 3909087872, 3917478784,
3925868416, 3934256512, 3942645376, 3951032192, 3959422336,
3967809152, 3976200064, 3984588416, 3992974976, 4001363584,
4009751168, 4018141312, 4026530432, 4034911616, 4043308928,
4051695488, 4060084352, 4068472448, 4076862848, 4085249408,
4093640576, 4102028416, 4110413696, 4118805632, 4127194496,
4135583104, 4143971968, 4152360832, 4160746112, 4169135744,
4177525888, 4185912704, 4194303616, 4202691968, 4211076736,
4219463552, 4227855488, 4236246656, 4244633728, 4253022848,
4261412224, 4269799808, 4278184832, 4286578048, 4294962304,
4303349632, 4311743104, 4320130432, 4328521088, 4336909184,
4345295488, 4353687424, 4362073472, 4370458496, 4378852736,
4387238528, 4395630208, 4404019072, 4412407424, 4420790656,
4429182848, 4437571456, 4445962112, 4454344064, 4462738048,
4471119232, 4479516544, 4487904128, 4496289664, 4504682368,
4513068416, 4521459584, 4529846144, 4538232704, 4546619776,
4555010176, 4563402112, 4571790208, 4580174464, 4588567936,
4596957056, 4605344896, 4613734016, 4622119808, 4630511488,
4638898816, 4647287936, 4655675264, 4664065664, 4672451968,
4680842624, 4689231488, 4697620352, 4706007424, 4714397056,
4722786176, 4731173248, 4739562368, 4747951744, 4756340608,
4764727936, 4773114496, 4781504384, 4789894784, 4798283648,
4806667648, 4815059584, 4823449472, 4831835776, 4840226176,
4848612224, 4857003392, 4865391488, 4873780096, 4882169728,
4890557312, 4898946944, 4907333248, 4915722368, 4924110976,
4932499328, 4940889728, 4949276032, 4957666432, 4966054784,
4974438016, 4982831488, 4991221376, 4999607168, 5007998848,
5016386432, 5024763776, 5033164672, 5041544576, 5049941888,
5058329728, 5066717056, 5075107456, 5083494272, 5091883904,
5100273536, 5108662144, 5117048192, 5125436032, 5133827456,
5142215296, 5150605184, 5158993024, 5167382144, 5175769472,
5184157568, 5192543872, 5200936064, 5209324928, 5217711232,
5226102656, 5234490496, 5242877312, 5251263872, 5259654016,
5268040832, 5276434304, 5284819328, 5293209728, 5301598592,
5309986688, 5318374784, 5326764416, 5335151488, 5343542144,
5351929472, 5360319872, 5368706944, 5377096576, 5385484928,
5393871232, 5402263424, 5410650496, 5419040384, 5427426944,
5435816576, 5444205952, 5452594816, 5460981376, 5469367936,
5477760896, 5486148736, 5494536832, 5502925952, 5511315328,
5519703424, 5528089984, 5536481152, 5544869504, 5553256064,
5561645696, 5570032768, 5578423936, 5586811264, 5595193216,
5603585408, 5611972736, 5620366208, 5628750464, 5637143936,
5645528192, 5653921408, 5662310272, 5670694784, 5679082624,
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17054039936, 17062426496, 17070814336, 17079205504, 17087592064,
17095978112, 17104369024, 17112759424, 17121147776, 17129536384,
17137926016, 17146314368, 17154700928, 17163089792, 17171480192,
17179864192, 17188256896, 17196644992, 17205033856, 17213423488,
17221811072, 17230198912, 17238588032, 17246976896, 17255360384,
17263754624, 17272143232, 17280530048, 17288918912, 17297309312,
17305696384, 17314085504, 17322475136, 17330863744, 17339252096,
17347640192, 17356026496, 17364413824, 17372796544, 17381190016,
17389583488, 17397972608, 17406360704, 17414748544, 17423135872,
17431527296, 17439915904, 17448303232, 17456691584, 17465081728,
17473468288, 17481857408, 17490247552, 17498635904, 17507022464,
17515409024, 17523801728, 17532189824, 17540577664, 17548966016,
17557353344, 17565741184, 17574131584, 17582519168, 17590907008,
17599296128, 17607687808, 17616076672, 17624455808, 17632852352,
17641238656, 17649630848, 17658018944, 17666403968, 17674794112,
17683178368, 17691573376, 17699962496, 17708350592, 17716739968,
17725126528, 17733517184, 17741898112, 17750293888, 17758673024,
17767070336, 17775458432, 17783848832, 17792236928, 17800625536,
17809012352, 17817402752, 17825785984, 17834178944, 17842563968,
17850955648, 17859344512, 17867732864, 17876119424, 17884511872,
17892900224, 17901287296, 17909677696, 17918058112, 17926451072,
17934843776, 17943230848, 17951609216, 17960008576, 17968397696,
17976784256, 17985175424, 17993564032, 18001952128, 18010339712,
18018728576, 18027116672, 18035503232, 18043894144, 18052283264,
18060672128, 18069056384, 18077449856, 18085837184, 18094225792,
18102613376, 18111004544, 18119388544, 18127781248, 18136170368,
18144558976, 18152947328, 18161336192, 18169724288, 18178108544,
18186498944, 18194886784, 18203275648, 18211666048, 18220048768,
18228444544, 18236833408, 18245220736}
// cacheSizes is a lookup table for the ethash verification cache size for the
// first 2048 epochs (i.e. 61440000 blocks).
var cacheSizes = [maxEpoch]uint64{
16776896, 16907456, 17039296, 17170112, 17301056, 17432512, 17563072,
17693888, 17824192, 17955904, 18087488, 18218176, 18349504, 18481088,
18611392, 18742336, 18874304, 19004224, 19135936, 19267264, 19398208,
19529408, 19660096, 19791424, 19922752, 20053952, 20184896, 20315968,
20446912, 20576576, 20709184, 20840384, 20971072, 21102272, 21233216,
21364544, 21494848, 21626816, 21757376, 21887552, 22019392, 22151104,
22281536, 22412224, 22543936, 22675264, 22806464, 22935872, 23068096,
23198272, 23330752, 23459008, 23592512, 23723968, 23854912, 23986112,
24116672, 24247616, 24378688, 24509504, 24640832, 24772544, 24903488,
25034432, 25165376, 25296704, 25427392, 25558592, 25690048, 25820096,
25951936, 26081728, 26214208, 26345024, 26476096, 26606656, 26737472,
26869184, 26998208, 27131584, 27262528, 27393728, 27523904, 27655744,
27786688, 27917888, 28049344, 28179904, 28311488, 28441792, 28573504,
28700864, 28835648, 28966208, 29096768, 29228608, 29359808, 29490752,
29621824, 29752256, 29882816, 30014912, 30144448, 30273728, 30406976,
30538432, 30670784, 30799936, 30932672, 31063744, 31195072, 31325248,
31456192, 31588288, 31719232, 31850432, 31981504, 32110784, 32243392,
32372672, 32505664, 32636608, 32767808, 32897344, 33029824, 33160768,
33289664, 33423296, 33554368, 33683648, 33816512, 33947456, 34076992,
34208704, 34340032, 34471744, 34600256, 34734016, 34864576, 34993984,
35127104, 35258176, 35386688, 35518528, 35650624, 35782336, 35910976,
36044608, 36175808, 36305728, 36436672, 36568384, 36699968, 36830656,
36961984, 37093312, 37223488, 37355072, 37486528, 37617472, 37747904,
37879232, 38009792, 38141888, 38272448, 38403392, 38535104, 38660672,
38795584, 38925632, 39059264, 39190336, 39320768, 39452096, 39581632,
39713984, 39844928, 39974848, 40107968, 40238144, 40367168, 40500032,
40631744, 40762816, 40894144, 41023552, 41155904, 41286208, 41418304,
41547712, 41680448, 41811904, 41942848, 42073792, 42204992, 42334912,
42467008, 42597824, 42729152, 42860096, 42991552, 43122368, 43253696,
43382848, 43515712, 43646912, 43777088, 43907648, 44039104, 44170432,
44302144, 44433344, 44564288, 44694976, 44825152, 44956864, 45088448,
45219008, 45350464, 45481024, 45612608, 45744064, 45874496, 46006208,
46136768, 46267712, 46399424, 46529344, 46660672, 46791488, 46923328,
47053504, 47185856, 47316928, 47447872, 47579072, 47710144, 47839936,
47971648, 48103232, 48234176, 48365248, 48496192, 48627136, 48757312,
48889664, 49020736, 49149248, 49283008, 49413824, 49545152, 49675712,
49807168, 49938368, 50069056, 50200256, 50331584, 50462656, 50593472,
50724032, 50853952, 50986048, 51117632, 51248576, 51379904, 51510848,
51641792, 51773248, 51903296, 52035136, 52164032, 52297664, 52427968,
52557376, 52690112, 52821952, 52952896, 53081536, 53213504, 53344576,
53475776, 53608384, 53738816, 53870528, 54000832, 54131776, 54263744,
54394688, 54525248, 54655936, 54787904, 54918592, 55049152, 55181248,
55312064, 55442752, 55574336, 55705024, 55836224, 55967168, 56097856,
56228672, 56358592, 56490176, 56621888, 56753728, 56884928, 57015488,
57146816, 57278272, 57409216, 57540416, 57671104, 57802432, 57933632,
58064576, 58195264, 58326976, 58457408, 58588864, 58720192, 58849984,
58981696, 59113024, 59243456, 59375552, 59506624, 59637568, 59768512,
59897792, 60030016, 60161984, 60293056, 60423872, 60554432, 60683968,
60817216, 60948032, 61079488, 61209664, 61341376, 61471936, 61602752,
61733696, 61865792, 61996736, 62127808, 62259136, 62389568, 62520512,
62651584, 62781632, 62910784, 63045056, 63176128, 63307072, 63438656,
63569216, 63700928, 63831616, 63960896, 64093888, 64225088, 64355392,
64486976, 64617664, 64748608, 64879424, 65009216, 65142464, 65273792,
65402816, 65535424, 65666752, 65797696, 65927744, 66060224, 66191296,
66321344, 66453056, 66584384, 66715328, 66846656, 66977728, 67108672,
67239104, 67370432, 67501888, 67631296, 67763776, 67895104, 68026304,
68157248, 68287936, 68419264, 68548288, 68681408, 68811968, 68942912,
69074624, 69205568, 69337024, 69467584, 69599168, 69729472, 69861184,
69989824, 70122944, 70253888, 70385344, 70515904, 70647232, 70778816,
70907968, 71040832, 71171648, 71303104, 71432512, 71564992, 71695168,
71826368, 71958464, 72089536, 72219712, 72350144, 72482624, 72613568,
72744512, 72875584, 73006144, 73138112, 73268672, 73400128, 73530944,
73662272, 73793344, 73924544, 74055104, 74185792, 74316992, 74448832,
74579392, 74710976, 74841664, 74972864, 75102784, 75233344, 75364544,
75497024, 75627584, 75759296, 75890624, 76021696, 76152256, 76283072,
76414144, 76545856, 76676672, 76806976, 76937792, 77070016, 77200832,
77331392, 77462464, 77593664, 77725376, 77856448, 77987776, 78118336,
78249664, 78380992, 78511424, 78642496, 78773056, 78905152, 79033664,
79166656, 79297472, 79429568, 79560512, 79690816, 79822784, 79953472,
80084672, 80214208, 80346944, 80477632, 80608576, 80740288, 80870848,
81002048, 81133504, 81264448, 81395648, 81525952, 81657536, 81786304,
81919808, 82050112, 82181312, 82311616, 82443968, 82573376, 82705984,
82835776, 82967744, 83096768, 83230528, 83359552, 83491264, 83622464,
83753536, 83886016, 84015296, 84147776, 84277184, 84409792, 84540608,
84672064, 84803008, 84934336, 85065152, 85193792, 85326784, 85458496,
85589312, 85721024, 85851968, 85982656, 86112448, 86244416, 86370112,
86506688, 86637632, 86769344, 86900672, 87031744, 87162304, 87293632,
87424576, 87555392, 87687104, 87816896, 87947968, 88079168, 88211264,
88341824, 88473152, 88603712, 88735424, 88862912, 88996672, 89128384,
89259712, 89390272, 89521984, 89652544, 89783872, 89914816, 90045376,
90177088, 90307904, 90438848, 90569152, 90700096, 90832832, 90963776,
91093696, 91223744, 91356992, 91486784, 91618496, 91749824, 91880384,
92012224, 92143552, 92273344, 92405696, 92536768, 92666432, 92798912,
92926016, 93060544, 93192128, 93322816, 93453632, 93583936, 93715136,
93845056, 93977792, 94109504, 94240448, 94371776, 94501184, 94632896,
94764224, 94895552, 95023424, 95158208, 95287744, 95420224, 95550016,
95681216, 95811904, 95943872, 96075328, 96203584, 96337856, 96468544,
96599744, 96731072, 96860992, 96992576, 97124288, 97254848, 97385536,
97517248, 97647808, 97779392, 97910464, 98041408, 98172608, 98303168,
98434496, 98565568, 98696768, 98827328, 98958784, 99089728, 99220928,
99352384, 99482816, 99614272, 99745472, 99876416, 100007104,
100138048, 100267072, 100401088, 100529984, 100662592, 100791872,
100925248, 101056064, 101187392, 101317952, 101449408, 101580608,
101711296, 101841728, 101973824, 102104896, 102235712, 102366016,
102498112, 102628672, 102760384, 102890432, 103021888, 103153472,
103284032, 103415744, 103545152, 103677248, 103808576, 103939648,
104070976, 104201792, 104332736, 104462528, 104594752, 104725952,
104854592, 104988608, 105118912, 105247808, 105381184, 105511232,
105643072, 105774784, 105903296, 106037056, 106167872, 106298944,
106429504, 106561472, 106691392, 106822592, 106954304, 107085376,
107216576, 107346368, 107478464, 107609792, 107739712, 107872192,
108003136, 108131392, 108265408, 108396224, 108527168, 108657344,
108789568, 108920384, 109049792, 109182272, 109312576, 109444928,
109572928, 109706944, 109837888, 109969088, 110099648, 110230976,
110362432, 110492992, 110624704, 110755264, 110886208, 111017408,
111148864, 111279296, 111410752, 111541952, 111673024, 111803456,
111933632, 112066496, 112196416, 112328512, 112457792, 112590784,
112715968, 112852672, 112983616, 113114944, 113244224, 113376448,
113505472, 113639104, 113770304, 113901376, 114031552, 114163264,
114294592, 114425536, 114556864, 114687424, 114818624, 114948544,
115080512, 115212224, 115343296, 115473472, 115605184, 115736128,
115867072, 115997248, 116128576, 116260288, 116391488, 116522944,
116652992, 116784704, 116915648, 117046208, 117178304, 117308608,
117440192, 117569728, 117701824, 117833024, 117964096, 118094656,
118225984, 118357312, 118489024, 118617536, 118749632, 118882112,
119012416, 119144384, 119275328, 119406016, 119537344, 119668672,
119798464, 119928896, 120061376, 120192832, 120321728, 120454336,
120584512, 120716608, 120848192, 120979136, 121109056, 121241408,
121372352, 121502912, 121634752, 121764416, 121895744, 122027072,
122157632, 122289088, 122421184, 122550592, 122682944, 122813888,
122945344, 123075776, 123207488, 123338048, 123468736, 123600704,
123731264, 123861952, 123993664, 124124608, 124256192, 124386368,
124518208, 124649024, 124778048, 124911296, 125041088, 125173696,
125303744, 125432896, 125566912, 125696576, 125829056, 125958592,
126090304, 126221248, 126352832, 126483776, 126615232, 126746432,
126876608, 127008704, 127139392, 127270336, 127401152, 127532224,
127663552, 127794752, 127925696, 128055232, 128188096, 128319424,
128449856, 128581312, 128712256, 128843584, 128973632, 129103808,
129236288, 129365696, 129498944, 129629888, 129760832, 129892288,
130023104, 130154048, 130283968, 130416448, 130547008, 130678336,
130807616, 130939456, 131071552, 131202112, 131331776, 131464384,
131594048, 131727296, 131858368, 131987392, 132120256, 132250816,
132382528, 132513728, 132644672, 132774976, 132905792, 133038016,
133168832, 133299392, 133429312, 133562048, 133692992, 133823296,
133954624, 134086336, 134217152, 134348608, 134479808, 134607296,
134741056, 134872384, 135002944, 135134144, 135265472, 135396544,
135527872, 135659072, 135787712, 135921472, 136052416, 136182848,
136313792, 136444864, 136576448, 136707904, 136837952, 136970048,
137099584, 137232064, 137363392, 137494208, 137625536, 137755712,
137887424, 138018368, 138149824, 138280256, 138411584, 138539584,
138672832, 138804928, 138936128, 139066688, 139196864, 139328704,
139460032, 139590208, 139721024, 139852864, 139984576, 140115776,
140245696, 140376512, 140508352, 140640064, 140769856, 140902336,
141032768, 141162688, 141294016, 141426496, 141556544, 141687488,
141819584, 141949888, 142080448, 142212544, 142342336, 142474432,
142606144, 142736192, 142868288, 142997824, 143129408, 143258944,
143392448, 143523136, 143653696, 143785024, 143916992, 144045632,
144177856, 144309184, 144440768, 144570688, 144701888, 144832448,
144965056, 145096384, 145227584, 145358656, 145489856, 145620928,
145751488, 145883072, 146011456, 146144704, 146275264, 146407232,
146538176, 146668736, 146800448, 146931392, 147062336, 147193664,
147324224, 147455936, 147586624, 147717056, 147848768, 147979456,
148110784, 148242368, 148373312, 148503232, 148635584, 148766144,
148897088, 149028416, 149159488, 149290688, 149420224, 149551552,
149683136, 149814976, 149943616, 150076352, 150208064, 150338624,
150470464, 150600256, 150732224, 150862784, 150993088, 151125952,
151254976, 151388096, 151519168, 151649728, 151778752, 151911104,
152042944, 152174144, 152304704, 152435648, 152567488, 152698816,
152828992, 152960576, 153091648, 153222976, 153353792, 153484096,
153616192, 153747008, 153878336, 154008256, 154139968, 154270912,
154402624, 154533824, 154663616, 154795712, 154926272, 155057984,
155188928, 155319872, 155450816, 155580608, 155712064, 155843392,
155971136, 156106688, 156237376, 156367424, 156499264, 156630976,
156761536, 156892352, 157024064, 157155008, 157284416, 157415872,
157545536, 157677248, 157810496, 157938112, 158071744, 158203328,
158334656, 158464832, 158596288, 158727616, 158858048, 158988992,
159121216, 159252416, 159381568, 159513152, 159645632, 159776192,
159906496, 160038464, 160169536, 160300352, 160430656, 160563008,
160693952, 160822208, 160956352, 161086784, 161217344, 161349184,
161480512, 161611456, 161742272, 161873216, 162002752, 162135872,
162266432, 162397888, 162529216, 162660032, 162790976, 162922048,
163052096, 163184576, 163314752, 163446592, 163577408, 163707968,
163839296, 163969984, 164100928, 164233024, 164364224, 164494912,
164625856, 164756672, 164887616, 165019072, 165150016, 165280064,
165412672, 165543104, 165674944, 165805888, 165936832, 166067648,
166198336, 166330048, 166461248, 166591552, 166722496, 166854208,
166985408, 167116736, 167246656, 167378368, 167508416, 167641024,
167771584, 167903168, 168034112, 168164032, 168295744, 168427456,
168557632, 168688448, 168819136, 168951616, 169082176, 169213504,
169344832, 169475648, 169605952, 169738048, 169866304, 169999552,
170131264, 170262464, 170393536, 170524352, 170655424, 170782016,
170917696, 171048896, 171179072, 171310784, 171439936, 171573184,
171702976, 171835072, 171966272, 172097216, 172228288, 172359232,
172489664, 172621376, 172747712, 172883264, 173014208, 173144512,
173275072, 173407424, 173539136, 173669696, 173800768, 173931712,
174063424, 174193472, 174325696, 174455744, 174586816, 174718912,
174849728, 174977728, 175109696, 175242688, 175374272, 175504832,
175636288, 175765696, 175898432, 176028992, 176159936, 176291264,
176422592, 176552512, 176684864, 176815424, 176946496, 177076544,
177209152, 177340096, 177470528, 177600704, 177731648, 177864256,
177994816, 178126528, 178257472, 178387648, 178518464, 178650176,
178781888, 178912064, 179044288, 179174848, 179305024, 179436736,
179568448, 179698496, 179830208, 179960512, 180092608, 180223808,
180354752, 180485696, 180617152, 180748096, 180877504, 181009984,
181139264, 181272512, 181402688, 181532608, 181663168, 181795136,
181926592, 182057536, 182190016, 182320192, 182451904, 182582336,
182713792, 182843072, 182976064, 183107264, 183237056, 183368384,
183494848, 183631424, 183762752, 183893824, 184024768, 184154816,
184286656, 184417984, 184548928, 184680128, 184810816, 184941248,
185072704, 185203904, 185335616, 185465408, 185596352, 185727296,
185859904, 185989696, 186121664, 186252992, 186383552, 186514112,
186645952, 186777152, 186907328, 187037504, 187170112, 187301824,
187429184, 187562048, 187693504, 187825472, 187957184, 188087104,
188218304, 188349376, 188481344, 188609728, 188743616, 188874304,
189005248, 189136448, 189265088, 189396544, 189528128, 189660992,
189791936, 189923264, 190054208, 190182848, 190315072, 190447424,
190577984, 190709312, 190840768, 190971328, 191102656, 191233472,
191364032, 191495872, 191626816, 191758016, 191888192, 192020288,
192148928, 192282176, 192413504, 192542528, 192674752, 192805952,
192937792, 193068608, 193198912, 193330496, 193462208, 193592384,
193723456, 193854272, 193985984, 194116672, 194247232, 194379712,
194508352, 194641856, 194772544, 194900672, 195035072, 195166016,
195296704, 195428032, 195558592, 195690304, 195818176, 195952576,
196083392, 196214336, 196345792, 196476736, 196607552, 196739008,
196869952, 197000768, 197130688, 197262784, 197394368, 197523904,
197656384, 197787584, 197916608, 198049472, 198180544, 198310208,
198442432, 198573632, 198705088, 198834368, 198967232, 199097792,
199228352, 199360192, 199491392, 199621696, 199751744, 199883968,
200014016, 200146624, 200276672, 200408128, 200540096, 200671168,
200801984, 200933312, 201062464, 201194944, 201326144, 201457472,
201588544, 201719744, 201850816, 201981632, 202111552, 202244032,
202374464, 202505152, 202636352, 202767808, 202898368, 203030336,
203159872, 203292608, 203423296, 203553472, 203685824, 203816896,
203947712, 204078272, 204208192, 204341056, 204472256, 204603328,
204733888, 204864448, 204996544, 205125568, 205258304, 205388864,
205517632, 205650112, 205782208, 205913536, 206044736, 206176192,
206307008, 206434496, 206569024, 206700224, 206831168, 206961856,
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