diff options
Diffstat (limited to 'pow/ethash.go')
| -rw-r--r-- | pow/ethash.go | 1138 |
1 files changed, 136 insertions, 1002 deletions
diff --git a/pow/ethash.go b/pow/ethash.go index 91c758d94..b22c65e0b 100644 --- a/pow/ethash.go +++ b/pow/ethash.go @@ -17,1055 +17,189 @@ package pow import ( - "encoding/binary" - "io" + "bytes" + "errors" "math/big" - "runtime" "sync" - "sync/atomic" "time" - "github.com/ethereum/go-ethereum/common" - "github.com/ethereum/go-ethereum/common/hexutil" - "github.com/ethereum/go-ethereum/crypto" "github.com/ethereum/go-ethereum/log" + metrics "github.com/rcrowley/go-metrics" ) -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 +var ( + ErrInvalidDifficulty = errors.New("non-positive difficulty") + ErrInvalidMixDigest = errors.New("invalid mix digest") + ErrInvalidPoW = errors.New("pow difficulty invalid") ) var ( - // Metadata fields to be compatible with the C++ ethash - ethashRevision = 23 // Data structure version - ethashMagic = hexutil.MustDecode("0xfee1deadbaddcafe") // Dataset dump magic number + // maxUint256 is a big integer representing 2^256-1 + maxUint256 = new(big.Int).Exp(big.NewInt(2), big.NewInt(256), big.NewInt(0)) ) -// cacheSize calculates and returns the size of the ethash verification cache that -// belongs to a certain block number. 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 cacheSize(block uint64) uint64 { - // If we have a pre-generated value, use that - epoch := int(block / epochLength) - if epoch < len(cacheSizes) { - return cacheSizes[epoch] - } - // No known cache size, calculate manually (sanity branch only) - size := uint64(cacheInitBytes + cacheGrowthBytes*epoch - hashBytes) - for !new(big.Int).SetUint64(size / hashBytes).ProbablyPrime(1) { // Always accurate for n < 2^64 - size -= 2 * hashBytes - } - return size -} - -// datasetSize calculates and returns the size of the ethash mining dataset that -// belongs to a certain block number. 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 datasetSize(block uint64) uint64 { - // If we have a pre-generated value, use that - epoch := int(block / epochLength) - if epoch < len(datasetSizes) { - return datasetSizes[epoch] - } - // No known dataset size, calculate manually (sanity branch only) - size := uint64(datasetInitBytes + datasetGrowthBytes*epoch - mixBytes) - for !new(big.Int).SetUint64(size / mixBytes).ProbablyPrime(1) { // Always accurate for n < 2^64 - size -= 2 * mixBytes - } - return size +// cache wraps an ethash cache with some metadata to allow easier concurrent use. +type cache struct { + epoch uint64 // Epoch for which this cache is relevant + cache []uint32 // The actual cache data content + used time.Time // Timestamp of the last use for smarter eviction + once sync.Once // Ensures the cache is generated only once + lock sync.Mutex // Ensures thread safety for updating the usage time } -// seedHash is the seed to use for generating a vrification cache and the mining -// dataset. -func seedHash(block uint64) []byte { - seed := make([]byte, 32) - if block < epochLength { - return seed - } - keccak256 := crypto.Keccak256Hasher() - for i := 0; i < int(block/epochLength); i++ { - seed = keccak256(seed) - } - return seed +// generate ensures that the cache content is generates. +func (c *cache) generate(test bool) { + c.once.Do(func() { + cacheSize := cacheSize(c.epoch*epochLength + 1) + if test { + cacheSize = 1024 + } + rawCache := generateCache(cacheSize, seedHash(c.epoch*epochLength+1)) + c.cache = prepare(uint64(len(rawCache)), bytes.NewReader(rawCache)) + }) } -// 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. -func generateCache(size uint64, seed []byte) []byte { - // Print some debug logs to allow analysis on low end devices - logger := log.New("size", size, "seed", hexutil.Bytes(seed)) - logger.Debug("Generating ethash cache") - - defer func(start time.Time) { - logger.Debug("Generated ethash cache", "elapsed", common.PrettyDuration(time.Since(start))) - }(time.Now()) +// Ethash is a PoW data struture implementing the ethash algorithm. +type Ethash struct { + cachedir string // Data directory to store the verification caches + dagdir string // Data directory to store full mining datasets - // Calculate the number of thoretical rows (we'll store in one buffer nonetheless) - rows := int(size) / hashBytes + caches map[uint64]*cache // In memory caches to avoid regenerating too often + future *cache // Pre-generated cache for the estimated future epoch + lock sync.Mutex // Ensures thread safety for the in-memory caches - // Create a hasher to reuse between invocations - keccak512 := crypto.Keccak512Hasher() + hashrate *metrics.StandardMeter // Meter tracking the average hashrate - // Sequentially produce the initial dataset - cache := make([]byte, size) - copy(cache, keccak512(seed)) - for offset := uint64(hashBytes); offset < size; offset += hashBytes { - copy(cache[offset:], keccak512(cache[offset-hashBytes:offset])) - } - // 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 - ) - xorBytes(temp, cache[srcOff:srcOff+hashBytes], cache[xorOff:xorOff+hashBytes]) - copy(cache[dstOff:], keccak512(temp)) - } - } - return cache + tester bool // Flag whether to use a smaller test dataset + shared bool // Flag whether to use a global chared dataset } -// prepare convers an ethash cache or dataset from a byte stream into the internal -// int representation. All ethash methods work with ints to avoid constant byte to -// int conversions as well as to handle both little and big endian systems. -func prepare(size uint64, r io.Reader) []uint32 { - ints := make([]uint32, size/4) - - buffer := make([]byte, 4) - for i := 0; i < len(ints); i++ { - io.ReadFull(r, buffer) - ints[i] = binary.LittleEndian.Uint32(buffer) +// NewFullEthash creates a full sized ethash PoW scheme. +func NewFullEthash(cachedir, dagdir string) PoW { + return &Ethash{ + cachedir: cachedir, + dagdir: dagdir, + caches: make(map[uint64]*cache), } - return ints } -// 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 +// NewTestEthash creates a small sized ethash PoW scheme useful only for testing +// purposes. +func NewTestEthash() PoW { + return &Ethash{ + caches: make(map[uint64]*cache), + tester: true, + } } -// 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] +// NewSharedEthash creates a full sized ethash PoW shared between all requesters +// running in the same process. +func NewSharedEthash() PoW { + return &Ethash{ + caches: make(map[uint64]*cache), + shared: true, } } -// 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 crypto.Hasher) []byte { - // Calculate the number of thoretical 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)]) +// Verify implements PoW, checking whether the given block satisfies the PoW +// difficulty requirements. +func (ethash *Ethash) Verify(block Block) error { + // Ensure twe have a valid difficulty for the block + difficulty := block.Difficulty() + if difficulty.Sign() <= 0 { + return ErrInvalidDifficulty } - mix = keccak512(mix) + // Recompute the digest and PoW value and verify against the block + number := block.NumberU64() + cache := ethash.cache(number) - // 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:]) + size := datasetSize(number) + if ethash.tester { + size = 32 * 1024 } - // 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:]) + digest, result := hashimotoLight(size, cache, block.HashNoNonce().Bytes(), block.Nonce()) + if !bytes.Equal(block.MixDigest().Bytes(), digest) { + return ErrInvalidMixDigest } - // Flatten the uint32 mix into a binary one and return - for i, val := range intMix { - binary.LittleEndian.PutUint32(mix[i*4:], val) + target := new(big.Int).Div(maxUint256, difficulty) + if new(big.Int).SetBytes(result).Cmp(target) > 0 { + return ErrInvalidPoW } - return keccak512(mix) + return nil } -// generateDataset generates the entire ethash dataset for mining. -func generateDataset(size uint64, cache []uint32) []byte { - // Print some debug logs to allow analysis on low end devices - logger := log.New("size", size) - logger.Debug("Generating ethash dataset") - - defer func(start time.Time) { - logger.Debug("Generated ethash dataset", "elapsed", common.PrettyDuration(time.Since(start))) - }(time.Now()) - - // Generate the dataset on many goroutines since it takes a while - dataset := make([]byte, size) - threads := runtime.NumCPU() - - var pend sync.WaitGroup - pend.Add(threads) - - var progress uint32 - for i := 0; i < threads; i++ { - go func(id int) { - defer pend.Done() - - // Create a hasher to reuse between invocations - keccak512 := crypto.Keccak512Hasher() - - // Calculate the data segment this thread should generate - batch := uint32(size / hashBytes / uint64(threads)) - start := uint32(id) * batch - limit := start + batch - if limit > uint32(size/hashBytes) { - limit = uint32(size / hashBytes) - } - // Calculate the dataset segment - percent := uint32(size / hashBytes / 100) - for index := start; index < limit; index++ { - copy(dataset[index*hashBytes:], generateDatasetItem(cache, index, keccak512)) - - if status := atomic.AddUint32(&progress, 1); status%percent == 0 { - logger.Info("Generating DAG in progress", "percentage", uint64(status*100)/(size/hashBytes)) +// cache tries to retrieve a verification cache for the specified block number +// by first checking against a list of in-memory caches, then against caches +// stored on disk, and finally generating one if none can be found. +func (ethash *Ethash) cache(block uint64) []uint32 { + epoch := block / epochLength + + // If we have a PoW for that epoch, use that + ethash.lock.Lock() + + current, future := ethash.caches[epoch], (*cache)(nil) + if current == nil { + // No in-memory cache, evict the oldest if the cache limit was reached + for len(ethash.caches) >= 3 { + var evict *cache + for _, cache := range ethash.caches { + if evict == nil || evict.used.After(cache.used) { + evict = cache } } - }(i) - } - // Wait for all the generators to finish and return - pend.Wait() - - return dataset -} - -// 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) { - // Calculate the number of thoretical rows (we use one buffer nonetheless) - rows := uint32(size / mixBytes) - - // Combine header+nonce into a 64 byte seed - seed := make([]byte, 40) - copy(seed, hash) - binary.LittleEndian.PutUint64(seed[32:], nonce) - - seed = crypto.Keccak512(seed) - seedHead := binary.LittleEndian.Uint32(seed) - - // Start the mix with replicated seed - mix := make([]uint32, mixBytes/4) - for i := 0; i < len(mix); i++ { - mix[i] = binary.LittleEndian.Uint32(seed[i%16*4:]) - } - // Mix in random dataset nodes - temp := make([]uint32, len(mix)) + delete(ethash.caches, evict.epoch) - for i := 0; i < loopAccesses; i++ { - parent := fnv(uint32(i)^seedHead, mix[i%len(mix)]) % rows - for j := uint32(0); j < mixBytes/hashBytes; j++ { - copy(temp[j*hashWords:], lookup(2*parent+j)) + log.Debug("Evictinged ethash cache", "old", evict.epoch, "used", evict.used) } - fnvHash(mix, temp) - } - // Compress mix - 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] + // If we have the new cache pre-generated, use that, otherwise create a new one + if ethash.future != nil && ethash.future.epoch == epoch { + log.Debug("Using pre-generated cache", "epoch", epoch) + current, ethash.future = ethash.future, nil + } else { + log.Debug("Generating new ethash cache", "epoch", epoch) + current = &cache{epoch: epoch} + } + ethash.caches[epoch] = current - digest := make([]byte, common.HashLength) - for i, val := range mix { - binary.LittleEndian.PutUint32(digest[i*4:], val) + // If we just used up the future cache, or need a refresh, regenerate + if ethash.future == nil || ethash.future.epoch <= epoch { + log.Debug("Pre-generating cache for the future", "epoch", epoch+1) + future = &cache{epoch: epoch + 1} + ethash.future = future + } } - return digest, crypto.Keccak256(append(seed, digest...)) -} + current.used = time.Now() + ethash.lock.Unlock() -// 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 := crypto.Keccak512Hasher() + // Wait for generation finish, bump the timestamp and finalize the cache + current.once.Do(func() { + current.generate(ethash.tester) + }) + current.lock.Lock() + current.used = time.Now() + current.lock.Unlock() - 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 + // If we exhusted the future cache, now's a goot time to regenerate it + if future != nil { + go future.generate(ethash.tester) } - return hashimoto(hash, nonce, size, lookup) + return current.cache } -// 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(size uint64, 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, size, lookup) +// Search implements PoW, attempting to find a nonce that satisfies the block's +// difficulty requirements. +func (ethash *Ethash) Search(block Block, stop <-chan struct{}) (uint64, []byte) { + return 0, nil } -// datasetSizes is a lookup table for the ethash dataset size for the first 2048 -// epochs (i.e. 61440000 blocks). -var datasetSizes = []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, - 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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} +// Hashrate implements PoW, returning the measured rate of the search invocations +// per second over the last minute. +func (ethash *Ethash) Hashrate() float64 { + return ethash.hashrate.Rate1() +} -// cacheSizes is a lookup table for the ethash verification cache size for the -// first 2048 epochs (i.e. 61440000 blocks). -var cacheSizes = []uint64{ - 16776896, 16907456, 17039296, 17170112, 17301056, 17432512, 17563072, - 17693888, 17824192, 17955904, 18087488, 18218176, 18349504, 18481088, - 18611392, 18742336, 18874304, 19004224, 19135936, 19267264, 19398208, - 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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, - 207093056, 207223616, 207355328, 207486784, 207616832, 207749056, - 207879104, 208010048, 208141888, 208273216, 208404032, 208534336, - 208666048, 208796864, 208927424, 209059264, 209189824, 209321792, - 209451584, 209582656, 209715136, 209845568, 209976896, 210106432, - 210239296, 210370112, 210501568, 210630976, 210763712, 210894272, - 211024832, 211156672, 211287616, 211418176, 211549376, 211679296, - 211812032, 211942592, 212074432, 212204864, 212334016, 212467648, - 212597824, 212727616, 212860352, 212991424, 213120832, 213253952, - 213385024, 213515584, 213645632, 213777728, 213909184, 214040128, - 214170688, 214302656, 214433728, 214564544, 214695232, 214826048, - 214956992, 215089088, 215219776, 215350592, 215482304, 215613248, - 215743552, 215874752, 216005312, 216137024, 216267328, 216399296, - 216530752, 216661696, 216790592, 216923968, 217054528, 217183168, - 217316672, 217448128, 217579072, 217709504, 217838912, 217972672, - 218102848, 218233024, 218364736, 218496832, 218627776, 218759104, - 218888896, 219021248, 219151936, 219281728, 219413056, 219545024, - 219675968, 219807296, 219938624, 220069312, 220200128, 220331456, - 220461632, 220592704, 220725184, 220855744, 220987072, 221117888, - 221249216, 221378368, 221510336, 221642048, 221772736, 221904832, - 222031808, 222166976, 222297536, 222428992, 222559936, 222690368, - 222820672, 222953152, 223083968, 223213376, 223345984, 223476928, - 223608512, 223738688, 223869376, 224001472, 224132672, 224262848, - 224394944, 224524864, 224657344, 224788288, 224919488, 225050432, - 225181504, 225312704, 225443776, 225574592, 225704768, 225834176, - 225966784, 226097216, 226229824, 226360384, 226491712, 226623424, - 226754368, 226885312, 227015104, 227147456, 227278528, 227409472, - 227539904, 227669696, 227802944, 227932352, 228065216, 228196288, - 228326464, 228457792, 228588736, 228720064, 228850112, 228981056, - 229113152, 229243328, 229375936, 229505344, 229636928, 229769152, - 229894976, 230030272, 230162368, 230292416, 230424512, 230553152, - 230684864, 230816704, 230948416, 231079616, 231210944, 231342016, - 231472448, 231603776, 231733952, 231866176, 231996736, 232127296, - 232259392, 232388672, 232521664, 232652608, 232782272, 232914496, - 233043904, 233175616, 233306816, 233438528, 233569984, 233699776, - 233830592, 233962688, 234092224, 234221888, 234353984, 234485312, - 234618304, 234749888, 234880832, 235011776, 235142464, 235274048, - 235403456, 235535936, 235667392, 235797568, 235928768, 236057152, - 236190272, 236322752, 236453312, 236583616, 236715712, 236846528, - 236976448, 237108544, 237239104, 237371072, 237501632, 237630784, - 237764416, 237895232, 238026688, 238157632, 238286912, 238419392, - 238548032, 238681024, 238812608, 238941632, 239075008, 239206336, - 239335232, 239466944, 239599168, 239730496, 239861312, 239992384, - 240122816, 240254656, 240385856, 240516928, 240647872, 240779072, - 240909632, 241040704, 241171904, 241302848, 241433408, 241565248, - 241696192, 241825984, 241958848, 242088256, 242220224, 242352064, - 242481856, 242611648, 242744896, 242876224, 243005632, 243138496, - 243268672, 243400384, 243531712, 243662656, 243793856, 243924544, - 244054592, 244187072, 244316608, 244448704, 244580032, 244710976, - 244841536, 244972864, 245104448, 245233984, 245365312, 245497792, - 245628736, 245759936, 245889856, 246021056, 246152512, 246284224, - 246415168, 246545344, 246675904, 246808384, 246939584, 247070144, - 247199552, 247331648, 247463872, 247593536, 247726016, 247857088, - 247987648, 248116928, 248249536, 248380736, 248512064, 248643008, - 248773312, 248901056, 249036608, 249167552, 249298624, 249429184, - 249560512, 249692096, 249822784, 249954112, 250085312, 250215488, - 250345792, 250478528, 250608704, 250739264, 250870976, 251002816, - 251133632, 251263552, 251395136, 251523904, 251657792, 251789248, - 251919424, 252051392, 252182464, 252313408, 252444224, 252575552, - 252706624, 252836032, 252968512, 253099712, 253227584, 253361728, - 253493056, 253623488, 253754432, 253885504, 254017216, 254148032, - 254279488, 254410432, 254541376, 254672576, 254803264, 254933824, - 255065792, 255196736, 255326528, 255458752, 255589952, 255721408, - 255851072, 255983296, 256114624, 256244416, 256374208, 256507712, - 256636096, 256768832, 256900544, 257031616, 257162176, 257294272, - 257424448, 257555776, 257686976, 257818432, 257949632, 258079552, - 258211136, 258342464, 258473408, 258603712, 258734656, 258867008, - 258996544, 259127744, 259260224, 259391296, 259522112, 259651904, - 259784384, 259915328, 260045888, 260175424, 260308544, 260438336, - 260570944, 260700992, 260832448, 260963776, 261092672, 261226304, - 261356864, 261487936, 261619648, 261750592, 261879872, 262011968, - 262143424, 262274752, 262404416, 262537024, 262667968, 262799296, - 262928704, 263061184, 263191744, 263322944, 263454656, 263585216, - 263716672, 263847872, 263978944, 264108608, 264241088, 264371648, - 264501184, 264632768, 264764096, 264895936, 265024576, 265158464, - 265287488, 265418432, 265550528, 265681216, 265813312, 265943488, - 266075968, 266206144, 266337728, 266468032, 266600384, 266731072, - 266862272, 266993344, 267124288, 267255616, 267386432, 267516992, - 267648704, 267777728, 267910592, 268040512, 268172096, 268302784, - 268435264, 268566208, 268696256, 268828096, 268959296, 269090368, - 269221312, 269352256, 269482688, 269614784, 269745856, 269876416, - 270007616, 270139328, 270270272, 270401216, 270531904, 270663616, - 270791744, 270924736, 271056832, 271186112, 271317184, 271449536, - 271580992, 271711936, 271843136, 271973056, 272105408, 272236352, - 272367296, 272498368, 272629568, 272759488, 272891456, 273022784, - 273153856, 273284672, 273415616, 273547072, 273677632, 273808448, - 273937088, 274071488, 274200896, 274332992, 274463296, 274595392, - 274726208, 274857536, 274988992, 275118656, 275250496, 275382208, - 275513024, 275643968, 275775296, 275906368, 276037184, 276167872, - 276297664, 276429376, 276560576, 276692672, 276822976, 276955072, - 277085632, 277216832, 277347008, 277478848, 277609664, 277740992, - 277868608, 278002624, 278134336, 278265536, 278395328, 278526784, - 278657728, 278789824, 278921152, 279052096, 279182912, 279313088, - 279443776, 279576256, 279706048, 279838528, 279969728, 280099648, - 280230976, 280361408, 280493632, 280622528, 280755392, 280887104, - 281018176, 281147968, 281278912, 281411392, 281542592, 281673152, - 281803712, 281935552, 282066496, 282197312, 282329024, 282458816, - 282590272, 282720832, 282853184, 282983744, 283115072, 283246144, - 283377344, 283508416, 283639744, 283770304, 283901504, 284032576, - 284163136, 284294848, 284426176, 284556992, 284687296, 284819264, - 284950208, 285081536} +// EthashSeedHash is the seed to use for generating a vrification cache and the +// mining dataset. +func EthashSeedHash(block uint64) []byte { + return seedHash(block) +} |