Ethash
Pembaruan terakhir halaman: 22 Oktober 2025
Ethash adalah versi modifikasi dari algoritma Dagger-Hashimoto. Proof-of-work Ethash bersifat memory hard (opens in a new tab), yang sebelumnya dianggap membuat algoritma ini tahan terhadap ASIC. ASIC Ethash pada akhirnya dikembangkan tetapi penambangan GPU masih menjadi pilihan yang layak sampai proof-of-work dimatikan. Ethash masih digunakan untuk menambang koin lain di jaringan proof-of-work non-Ethereum lainnya.
Bagaimana cara kerja Ethash?
Sifat memory hard dicapai dengan algoritma proof-of-work yang membutuhkan pemilihan subset dari sumber daya tetap yang bergantung pada nonce dan header blok. Sumber daya ini (berukuran beberapa gigabyte) disebut DAG. DAG diubah setiap 30000 blok, sebuah jendela waktu ~125 jam yang disebut epoch (sekitar 5,2 hari) dan membutuhkan waktu untuk dihasilkan. Karena DAG hanya bergantung pada tinggi blok, ia dapat dihasilkan sebelumnya, tetapi jika tidak, klien harus menunggu hingga akhir proses ini untuk menghasilkan sebuah blok. Jika klien tidak menghasilkan sebelumnya dan menyimpan DAG dalam cache lebih awal, jaringan mungkin mengalami penundaan blok yang masif pada setiap transisi epoch. Perhatikan bahwa DAG tidak perlu dihasilkan untuk memverifikasi proof-of-work, yang pada dasarnya memungkinkan verifikasi dengan CPU rendah dan memori kecil.
Rute umum yang diambil oleh algoritma adalah sebagai berikut:
- Terdapat sebuah seed yang dapat dihitung untuk setiap blok dengan memindai melalui header blok hingga titik tersebut.
- Dari seed tersebut, seseorang dapat menghitung cache pseudorandom 16 MB. Klien ringan menyimpan cache ini.
- Dari cache tersebut, kita dapat menghasilkan dataset 1 GB, dengan properti bahwa setiap item dalam dataset hanya bergantung pada sejumlah kecil item dari cache. Klien penuh dan penambang menyimpan dataset ini. Dataset tumbuh secara linear seiring waktu.
- Penambangan melibatkan pengambilan irisan acak dari dataset dan melakukan hash bersama-sama. Verifikasi dapat dilakukan dengan memori rendah dengan menggunakan cache untuk menghasilkan kembali bagian-bagian spesifik dari dataset yang Anda butuhkan, sehingga Anda hanya perlu menyimpan cache.
Dataset besar ini diperbarui setiap 30000 blok, sehingga sebagian besar upaya penambang akan dihabiskan untuk membaca dataset, bukan membuat perubahan padanya.
Definisi
Kami menggunakan definisi berikut:
1WORD_BYTES = 4 # bytes in word2DATASET_BYTES_INIT = 2**30 # bytes in dataset at genesis3DATASET_BYTES_GROWTH = 2**23 # dataset growth per epoch4CACHE_BYTES_INIT = 2**24 # bytes in cache at genesis5CACHE_BYTES_GROWTH = 2**17 # cache growth per epoch6CACHE_MULTIPLIER=1024 # Size of the DAG relative to the cache7EPOCH_LENGTH = 30000 # blocks per epoch8MIX_BYTES = 128 # width of mix9HASH_BYTES = 64 # hash length in bytes10DATASET_PARENTS = 256 # number of parents of each dataset element11CACHE_ROUNDS = 3 # number of rounds in cache production12ACCESSES = 64 # number of accesses in hashimoto loopTampilkan semuaPenggunaan 'SHA3'
Pengembangan Ethereum bertepatan dengan pengembangan standar SHA3, dan proses standar membuat perubahan terlambat pada padding dari algoritma hash yang difinalisasi, sehingga hash "sha3_256" dan "sha3_512" Ethereum bukanlah hash sha3 standar, melainkan varian yang sering disebut sebagai "Keccak-256" dan "Keccak-512" dalam konteks lain. Lihat diskusi, mis., di sini (opens in a new tab), di sini (opens in a new tab), atau di sini (opens in a new tab).
Harap diingat hal tersebut karena hash "sha3" dirujuk dalam deskripsi algoritma di bawah ini.
Parameter
Parameter untuk cache dan dataset Ethash bergantung pada nomor blok. Ukuran cache dan ukuran dataset keduanya tumbuh secara linear; namun, kami selalu mengambil bilangan prima tertinggi di bawah ambang batas yang tumbuh secara linear untuk mengurangi risiko keteraturan yang tidak disengaja yang mengarah pada perilaku siklik.
1def get_cache_size(block_number):2 sz = CACHE_BYTES_INIT + CACHE_BYTES_GROWTH * (block_number // EPOCH_LENGTH)3 sz -= HASH_BYTES4 while not isprime(sz / HASH_BYTES):5 sz -= 2 * HASH_BYTES6 return sz78def get_full_size(block_number):9 sz = DATASET_BYTES_INIT + DATASET_BYTES_GROWTH * (block_number // EPOCH_LENGTH)10 sz -= MIX_BYTES11 while not isprime(sz / MIX_BYTES):12 sz -= 2 * MIX_BYTES13 return szTampilkan semuaTabel nilai ukuran dataset dan cache disediakan di lampiran.
Pembuatan cache
Sekarang, kami menentukan fungsi untuk menghasilkan cache:
1def mkcache(cache_size, seed):2 n = cache_size // HASH_BYTES34 # Sequentially produce the initial dataset # Hasilkan dataset awal secara berurutan5 o = [sha3_512(seed)]6 for i in range(1, n):7 o.append(sha3_512(o[-1]))89 # Use a low-round version of randmemohash # Gunakan versi putaran rendah dari randmemohash10 for _ in range(CACHE_ROUNDS):11 for i in range(n):12 v = o[i][0] % n13 o[i] = sha3_512(map(xor, o[(i-1+n) % n], o[v]))1415 return oTampilkan semuaProses produksi cache melibatkan pengisian memori 32 MB secara berurutan terlebih dahulu, kemudian melakukan dua lintasan algoritma RandMemoHash dari Sergio Demian Lerner dari Strict Memory Hard Hashing Functions (2014) (opens in a new tab). Outputnya adalah sekumpulan 524288 nilai 64-byte.
Fungsi agregasi data
Kami menggunakan algoritma yang terinspirasi oleh hash FNV (opens in a new tab) dalam beberapa kasus sebagai pengganti non-asosiatif untuk XOR. Perhatikan bahwa kami mengalikan bilangan prima dengan input 32-bit penuh, berbeda dengan spesifikasi FNV-1 yang mengalikan bilangan prima dengan satu byte (oktet) secara bergantian.
1FNV_PRIME = 0x0100019323def fnv(v1, v2):4 return ((v1 * FNV_PRIME) ^ v2) % 2**32Harap dicatat, meskipun yellow paper menentukan fnv sebagai v1*(FNV_PRIME ^ v2), semua implementasi saat ini secara konsisten menggunakan definisi di atas.
Perhitungan dataset penuh
Setiap item 64-byte dalam dataset penuh 1 GB dihitung sebagai berikut:
1def calc_dataset_item(cache, i):2 n = len(cache)3 r = HASH_BYTES // WORD_BYTES4 # initialize the mix # inisialisasi campuran5 mix = copy.copy(cache[i % n])6 mix[0] ^= i7 mix = sha3_512(mix)8 # fnv it with a lot of random cache nodes based on i # terapkan fnv padanya dengan banyak node cache acak berdasarkan i9 for j in range(DATASET_PARENTS):10 cache_index = fnv(i ^ j, mix[j % r])11 mix = map(fnv, mix, cache[cache_index % n])12 return sha3_512(mix)Tampilkan semuaPada dasarnya, kami menggabungkan data dari 256 node cache yang dipilih secara pseudorandom, dan melakukan hash untuk menghitung node dataset. Seluruh dataset kemudian dihasilkan oleh:
1def calc_dataset(full_size, cache):2 return [calc_dataset_item(cache, i) for i in range(full_size // HASH_BYTES)]Loop utama
Sekarang, kami menentukan loop utama yang mirip dengan "hashimoto", di mana kami mengagregasi data dari dataset penuh untuk menghasilkan nilai akhir kami untuk header dan nonce tertentu. Dalam kode di bawah ini, header mewakili hash SHA3-256 dari representasi RLP dari header blok yang dipotong, yaitu, dari header yang mengecualikan bidang mixHash dan nonce. nonce adalah delapan byte dari bilangan bulat tak bertanda 64 bit dalam urutan big-endian. Jadi nonce[::-1] adalah representasi little-endian delapan byte dari nilai tersebut:
1def hashimoto(header, nonce, full_size, dataset_lookup):2 n = full_size / HASH_BYTES3 w = MIX_BYTES // WORD_BYTES4 mixhashes = MIX_BYTES / HASH_BYTES5 # combine header+nonce into a 64 byte seed # gabungkan header+nonce menjadi seed 64 byte6 s = sha3_512(header + nonce[::-1])7 # start the mix with replicated s # mulai campuran dengan s yang direplikasi8 mix = []9 for _ in range(MIX_BYTES / HASH_BYTES):10 mix.extend(s)11 # mix in random dataset nodes # campurkan node dataset acak12 for i in range(ACCESSES):13 p = fnv(i ^ s[0], mix[i % w]) % (n // mixhashes) * mixhashes14 newdata = []15 for j in range(MIX_BYTES / HASH_BYTES):16 newdata.extend(dataset_lookup(p + j))17 mix = map(fnv, mix, newdata)18 # compress mix # kompres campuran19 cmix = []20 for i in range(0, len(mix), 4):21 cmix.append(fnv(fnv(fnv(mix[i], mix[i+1]), mix[i+2]), mix[i+3]))22 return {23 "mix digest": serialize_hash(cmix),24 "result": serialize_hash(sha3_256(s+cmix))25 }2627def hashimoto_light(full_size, cache, header, nonce):28 return hashimoto(header, nonce, full_size, lambda x: calc_dataset_item(cache, x))2930def hashimoto_full(full_size, dataset, header, nonce):31 return hashimoto(header, nonce, full_size, lambda x: dataset[x])Tampilkan semuaPada dasarnya, kami mempertahankan "campuran" selebar 128 byte, dan berulang kali mengambil 128 byte secara berurutan dari dataset penuh dan menggunakan fungsi fnv untuk menggabungkannya dengan campuran tersebut. Akses berurutan 128 byte digunakan sehingga setiap putaran algoritma selalu mengambil halaman penuh dari RAM, meminimalkan kegagalan translation lookaside buffer yang secara teoritis dapat dihindari oleh ASIC.
Jika output dari algoritma ini berada di bawah target yang diinginkan, maka nonce tersebut valid. Perhatikan bahwa penerapan ekstra sha3_256 di akhir memastikan bahwa terdapat nonce perantara yang dapat diberikan untuk membuktikan bahwa setidaknya sejumlah kecil pekerjaan telah dilakukan; verifikasi PoW luar yang cepat ini dapat digunakan untuk tujuan anti-DDoS. Ini juga berfungsi untuk memberikan jaminan statistik bahwa hasilnya adalah angka 256-bit yang tidak bias.
Penambangan
Algoritma penambangan didefinisikan sebagai berikut:
1def mine(full_size, dataset, header, difficulty):2 # zero-pad target to compare with hash on the same digit # tambahkan padding nol pada target untuk dibandingkan dengan hash pada digit yang sama3 target = zpad(encode_int(2**256 // difficulty), 64)[::-1]4 from random import randint5 nonce = randint(0, 2**64)6 while hashimoto_full(full_size, dataset, header, nonce) > target:7 nonce = (nonce + 1) % 2**648 return nonceMendefinisikan hash seed
Untuk menghitung hash seed yang akan digunakan untuk menambang di atas blok tertentu, kami menggunakan algoritma berikut:
1 def get_seedhash(block):2 s = '\x00' * 323 for i in range(block.number // EPOCH_LENGTH):4 s = serialize_hash(sha3_256(s))5 return sPerhatikan bahwa untuk penambangan dan verifikasi yang lancar, kami merekomendasikan untuk menghitung sebelumnya hash seed dan dataset masa depan dalam thread terpisah.
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Lampiran
Kode berikut harus ditambahkan di awal jika Anda tertarik untuk menjalankan spesifikasi python di atas sebagai kode.
1import sha3, copy23# Assumes little endian bit ordering (same as Intel architectures) # Mengasumsikan pengurutan bit little endian (sama dengan arsitektur Intel)4def decode_int(s):5 return int(s[::-1].encode('hex'), 16) if s else 067def encode_int(s):8 a = "%x" % s9 return '' if s == 0 else ('0' * (len(a) % 2) + a).decode('hex')[::-1]1011def zpad(s, length):12 return s + '\x00' * max(0, length - len(s))1314def serialize_hash(h):15 return ''.join([zpad(encode_int(x), 4) for x in h])1617def deserialize_hash(h):18 return [decode_int(h[i:i+WORD_BYTES]) for i in range(0, len(h), WORD_BYTES)]1920def hash_words(h, sz, x):21 if isinstance(x, list):22 x = serialize_hash(x)23 y = h(x)24 return deserialize_hash(y)2526def serialize_cache(ds):27 return ''.join([serialize_hash(h) for h in ds])2829serialize_dataset = serialize_cache3031# sha3 hash function, outputs 64 bytes # fungsi hash sha3, menghasilkan 64 byte32def sha3_512(x):33 return hash_words(lambda v: sha3.sha3_512(v).digest(), 64, x)3435def sha3_256(x):36 return hash_words(lambda v: sha3.sha3_256(v).digest(), 32, x)3738def xor(a, b):39 return a ^ b4041def isprime(x):42 for i in range(2, int(x**0.5)):43 if x % i == 0:44 return False45 return TrueTampilkan semuaUkuran Data
Tabel pencarian berikut menyediakan sekitar 2048 epoch yang ditabulasi dari ukuran data dan ukuran cache.
1def get_datasize(block_number):2 return data_sizes[block_number // EPOCH_LENGTH]34def get_cachesize(block_number):5 return cache_sizes[block_number // EPOCH_LENGTH]67data_sizes = [81073739904, 1082130304, 1090514816, 1098906752, 1107293056,91115684224, 1124070016, 1132461952, 1140849536, 1149232768,101157627776, 1166013824, 1174404736, 1182786944, 1191180416,111199568512, 1207958912, 1216345216, 1224732032, 1233124736,121241513344, 1249902464, 1258290304, 1266673792, 1275067264,131283453312, 1291844992, 1300234112, 1308619904, 1317010048,141325397376, 1333787776, 1342176128, 1350561664, 1358954368,151367339392, 1375731584, 1384118144, 1392507008, 1400897408,161409284736, 1417673344, 1426062464, 1434451072, 1442839168,171451229056, 1459615616, 1468006016, 1476394112, 1484782976,181493171584, 1501559168, 1509948032, 1518337664, 1526726528,191535114624, 1543503488, 1551892096, 1560278656, 1568669056,201577056384, 1585446272, 1593831296, 1602219392, 1610610304,211619000192, 1627386752, 1635773824, 1644164224, 1652555648,221660943488, 1669332608, 1677721216, 1686109312, 1694497664,231702886272, 1711274624, 1719661184, 1728047744, 1736434816,241744829056, 1753218944, 1761606272, 1769995904, 1778382464,251786772864, 1795157888, 1803550592, 1811937664, 1820327552,261828711552, 1837102976, 1845488768, 1853879936, 1862269312,271870656896, 1879048064, 1887431552, 1895825024, 1904212096,281912601216, 1920988544, 1929379456, 1937765504, 1946156672,291954543232, 1962932096, 1971321728, 1979707264, 1988093056,301996487552, 2004874624, 2013262208, 2021653888, 2030039936,312038430848, 2046819968, 2055208576, 2063596672, 2071981952,322080373632, 2088762752, 2097149056, 2105539712, 2113928576,332122315136, 2130700672, 2139092608, 2147483264, 2155872128,342164257664, 2172642176, 2181035392, 2189426048, 2197814912,352206203008, 2214587264, 2222979712, 2231367808, 2239758208,362248145024, 2256527744, 2264922752, 2273312128, 2281701248,372290086272, 2298476672, 2306867072, 2315251072, 2323639168,382332032128, 2340420224, 2348808064, 2357196416, 2365580416,392373966976, 2382363008, 2390748544, 2399139968, 2407530368,402415918976, 2424307328, 2432695424, 2441084288, 2449472384,412457861248, 2466247808, 2474637184, 2483026816, 2491414144,422499803776, 2508191872, 2516582272, 2524970368, 2533359232,432541743488, 2550134144, 2558525056, 2566913408, 2575301504,442583686528, 2592073856, 2600467328, 2608856192, 2617240448,452625631616, 2634022016, 2642407552, 2650796416, 2659188352,462667574912, 2675965312, 2684352896, 2692738688, 2701130624,472709518464, 2717907328, 2726293376, 2734685056, 2743073152,482751462016, 2759851648, 2768232832, 2776625536, 2785017728,492793401984, 2801794432, 2810182016, 2818571648, 2826959488,502835349376, 2843734144, 2852121472, 2860514432, 2868900992,512877286784, 2885676928, 2894069632, 2902451584, 2910843008,522919234688, 2927622784, 2936011648, 2944400768, 2952789376,532961177728, 2969565568, 2977951616, 2986338944, 2994731392,543003120256, 3011508352, 3019895936, 3028287104, 3036675968,553045063808, 3053452928, 3061837696, 3070228352, 3078615424,563087003776, 3095394944, 3103782272, 3112173184, 3120562048,573128944768, 3137339264, 3145725056, 3154109312, 3162505088,583170893184, 3179280256, 3187669376, 3196056704, 3204445568,593212836736, 3221224064, 3229612928, 3238002304, 3246391168,603254778496, 3263165824, 3271556224, 3279944576, 3288332416,613296719232, 3305110912, 3313500032, 3321887104, 3330273152,623338658944, 3347053184, 3355440512, 3363827072, 3372220288,633380608384, 3388997504, 3397384576, 3405774208, 3414163072,643422551936, 3430937984, 3439328384, 3447714176, 3456104576,653464493952, 3472883584, 3481268864, 3489655168, 3498048896,663506434432, 3514826368, 3523213952, 3531603584, 3539987072,673548380288, 3556763264, 3565157248, 3573545344, 3581934464,683590324096, 3598712704, 3607098752, 3615488384, 3623877248,693632265856, 3640646528, 3649043584, 3657430144, 3665821568,703674207872, 3682597504, 3690984832, 3699367808, 3707764352,713716152448, 3724541056, 3732925568, 3741318016, 3749706368,723758091136, 3766481536, 3774872704, 3783260032, 3791650432,733800036224, 3808427648, 3816815488, 3825204608, 3833592704,743841981568, 3850370432, 3858755968, 3867147904, 3875536256,753883920512, 3892313728, 3900702592, 3909087872, 3917478784,763925868416, 3934256512, 3942645376, 3951032192, 3959422336,773967809152, 3976200064, 3984588416, 3992974976, 4001363584,784009751168, 4018141312, 4026530432, 4034911616, 4043308928,794051695488, 4060084352, 4068472448, 4076862848, 4085249408,804093640576, 4102028416, 4110413696, 4118805632, 4127194496,814135583104, 4143971968, 4152360832, 4160746112, 4169135744,824177525888, 4185912704, 4194303616, 4202691968, 4211076736,834219463552, 4227855488, 4236246656, 4244633728, 4253022848,844261412224, 4269799808, 4278184832, 4286578048, 4294962304,854303349632, 4311743104, 4320130432, 4328521088, 4336909184,864345295488, 4353687424, 4362073472, 4370458496, 4378852736,874387238528, 4395630208, 4404019072, 4412407424, 4420790656,884429182848, 4437571456, 4445962112, 4454344064, 4462738048,894471119232, 4479516544, 4487904128, 4496289664, 4504682368,904513068416, 4521459584, 4529846144, 4538232704, 4546619776,914555010176, 4563402112, 4571790208, 4580174464, 4588567936,924596957056, 4605344896, 4613734016, 4622119808, 4630511488,934638898816, 4647287936, 4655675264, 4664065664, 4672451968,944680842624, 4689231488, 4697620352, 4706007424, 4714397056,954722786176, 4731173248, 4739562368, 4747951744, 4756340608,964764727936, 4773114496, 4781504384, 4789894784, 4798283648,974806667648, 4815059584, 4823449472, 4831835776, 4840226176,984848612224, 4857003392, 4865391488, 4873780096, 4882169728,994890557312, 4898946944, 4907333248, 4915722368, 4924110976,1004932499328, 4940889728, 4949276032, 4957666432, 4966054784,1014974438016, 4982831488, 4991221376, 4999607168, 5007998848,1025016386432, 5024763776, 5033164672, 5041544576, 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