How does Ethash work?
Memory hardness is achieved with a proof of work algorithm that requires choosing subsets of a fixed resource dependent on the nonce and block header. This resource (a few gigabytes in size) is called a DAG. The DAG is changed every30,000
blocks, a ~120-hour window called an epoch (5 days, considering Ethereum’s 15-second blocks) and takes a while to generate. Since the DAG only depends on block height, it can be pre-generated, but if it’s not the client needs to wait until the end of this process to produce a block. If clients do not pre-generate and cache DAGs ahead of time the network may experience massive block delay on each epoch transition. Note that the DAG does not need to be generated for verifying the proof-of-work essentially allowing for verification with both low CPU and small memory.
The general route that the algorithm takes is as follows:
- There exists a seed which can be computed for each block by scanning through the block headers up until that point.
- From the seed, one can compute a 16 MB pseudorandom cache. Light clients store the cache.
- From the cache, we can generate a 1 GB dataset, with the property that each item in the dataset depends on only a small number of items from the cache. Full clients and miners store the dataset. The dataset grows linearly with time.
- Mining involves grabbing random slices of the dataset and hashing them together. Verification can be done with low memory by using the cache to regenerate the specific pieces of the dataset that you need, so you only need to store the cache.
30,000
blocks, so the vast majority of a miner’s effort will be reading the dataset, not making changes to it.
Definitions
We employ the following definitions:Copy
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WORD_BYTES = 4 # bytes in word
DATASET_BYTES_INIT = 2**30 # bytes in dataset at genesis
DATASET_BYTES_GROWTH = 2**23 # dataset growth per epoch
CACHE_BYTES_INIT = 2**24 # bytes in cache at genesis
CACHE_BYTES_GROWTH = 2**17 # cache growth per epoch
CACHE_MULTIPLIER=1024 # Size of the DAG relative to the cache
EPOCH_LENGTH = 30000 # blocks per epoch
MIX_BYTES = 128 # width of mix
HASH_BYTES = 64 # hash length in bytes
DATASET_PARENTS = 256 # number of parents of each dataset element
CACHE_ROUNDS = 3 # number of rounds in cache production
ACCESSES = 64 # number of accesses in hashimoto loop
The use of ‘SHA3’
Ethereum’s development coincided with the development of the SHA3 standard, and the standards process made a late change in the padding of the finalized hash algorithm, so that Ethereum’s “sha3_256” and “sha3_512” hashes are not standard sha3 hashes, but a variant often referred to as “Keccak-256” and “Keccak-512” in other contexts. See discussion, e.g. here, here, or here. Please keep that in mind as “sha3” hashes are referred to in the description of the algorithm below.Parameters
The parameters for Ethash’s cache and dataset depend on the block number. The cache size and dataset size both grow 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.Copy
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def get_cache_size(block_number):
sz = CACHE_BYTES_INIT + CACHE_BYTES_GROWTH * (block_number // EPOCH_LENGTH)
sz -= HASH_BYTES
while not isprime(sz / HASH_BYTES):
sz -= 2 * HASH_BYTES
return sz
def get_full_size(block_number):
sz = DATASET_BYTES_INIT + DATASET_BYTES_GROWTH * (block_number // EPOCH_LENGTH)
sz -= MIX_BYTES
while not isprime(sz / MIX_BYTES):
sz -= 2 * MIX_BYTES
return sz
Cache generation
Now, we specify the function for producing a cache:Copy
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def mkcache(cache_size, seed):
n = cache_size // HASH_BYTES
# Sequentially produce the initial dataset
o = [sha3_512(seed)]
for i in range(1, n):
o.append(sha3_512(o[-1]))
# Use a low-round version of randmemohash
for _ in range(CACHE_ROUNDS):
for i in range(n):
v = o[i][0] % n
o[i] = sha3_512(map(xor, o[(i-1+n) % n], o[v]))
return o
Data aggregation function
We use an algorithm inspired by the FNV hash in some cases 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.Copy
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FNV_PRIME = 0x01000193
def fnv(v1, v2):
return ((v1 * FNV_PRIME) ^ v2) % 2**32
Full dataset calculation
Each 64-byte item in the full 1 GB dataset is computed as follows:Copy
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def calc_dataset_item(cache, i):
n = len(cache)
r = HASH_BYTES // WORD_BYTES
# initialize the mix
mix = copy.copy(cache[i % n])
mix[0] ^= i
mix = sha3_512(mix)
# fnv it with a lot of random cache nodes based on i
for j in range(DATASET_PARENTS):
cache_index = fnv(i ^ j, mix[j % r])
mix = map(fnv, mix, cache[cache_index % n])
return sha3_512(mix)
Copy
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def calc_dataset(full_size, cache):
return [calc_dataset_item(cache, i) for i in range(full_size // HASH_BYTES)]
Main loop
Now, we specify the main “hashimoto”-like loop, where we aggregate data from the full dataset in order to produce our final value for a particular header and nonce. In the code below,header
represents the SHA3-256 hash of the RLP representation of a truncated block header, that is, of a header excluding the fields mixHash and nonce. nonce
is the eight bytes of a 64 bit unsigned integer in big-endian order. So nonce[::-1]
is the eight-byte little-endian representation of that value:
Copy
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def hashimoto(header, nonce, full_size, dataset_lookup):
n = full_size / HASH_BYTES
w = MIX_BYTES // WORD_BYTES
mixhashes = MIX_BYTES / HASH_BYTES
# combine header+nonce into a 64 byte seed
s = sha3_512(header + nonce[::-1])
# start the mix with replicated s
mix = []
for _ in range(MIX_BYTES / HASH_BYTES):
mix.extend(s)
# mix in random dataset nodes
for i in range(ACCESSES):
p = fnv(i ^ s[0], mix[i % w]) % (n // mixhashes) * mixhashes
newdata = []
for j in range(MIX_BYTES / HASH_BYTES):
newdata.extend(dataset_lookup(p + j))
mix = map(fnv, mix, newdata)
# compress mix
cmix = []
for i in range(0, len(mix), 4):
cmix.append(fnv(fnv(fnv(mix[i], mix[i+1]), mix[i+2]), mix[i+3]))
return {
"mix digest": serialize_hash(cmix),
"result": serialize_hash(sha3_256(s+cmix))
}
def hashimoto_light(full_size, cache, header, nonce):
return hashimoto(header, nonce, full_size, lambda x: calc_dataset_item(cache, x))
def hashimoto_full(full_size, dataset, header, nonce):
return hashimoto(header, nonce, full_size, lambda x: dataset[x])
fnv
function to combine it with the mix. 128 bytes of sequential access are used so that each round of the algorithm always fetches a full page from RAM, minimizing translation lookaside buffer misses which ASICs would theoretically be able to avoid.
If the output of this algorithm is below the desired target, then the nonce is valid. Note that the extra application of sha3_256
at the end ensures that there exists an intermediate nonce which can be provided to prove that at least a small amount of work was done; this quick outer PoW verification can be used for anti-DDoS purposes. It also serves to provide statistical assurance that the result is an unbiased, 256-bit number.
Mining
The mining algorithm is defined as follows:Copy
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def mine(full_size, dataset, header, difficulty):
# zero-pad target to compare with hash on the same digit
target = zpad(encode_int(2**256 // difficulty), 64)[::-1]
from random import randint
nonce = randint(0, 2**64)
while hashimoto_full(full_size, dataset, header, nonce) > target:
nonce = (nonce + 1) % 2**64
return nonce
Defining the seed hash
In order to compute the seed hash that would be used to mine on top of a given block, we use the following algorithm:Copy
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def get_seedhash(block):
s = '\x00' * 32
for i in range(block.number // EPOCH_LENGTH):
s = serialize_hash(sha3_256(s))
return s
Appendix
The following code should be prepended if you are interested in running the above python spec as code.Copy
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import sha3, copy
# Assumes little endian bit ordering (same as Intel architectures)
def decode_int(s):
return int(s[::-1].encode('hex'), 16) if s else 0
def encode_int(s):
a = "%x" % s
return '' if s == 0 else ('0' * (len(a) % 2) + a).decode('hex')[::-1]
def zpad(s, length):
return s + '\x00' * max(0, length - len(s))
def serialize_hash(h):
return ''.join([zpad(encode_int(x), 4) for x in h])
def deserialize_hash(h):
return [decode_int(h[i:i+WORD_BYTES]) for i in range(0, len(h), WORD_BYTES)]
def hash_words(h, sz, x):
if isinstance(x, list):
x = serialize_hash(x)
y = h(x)
return deserialize_hash(y)
def serialize_cache(ds):
return ''.join([serialize_hash(h) for h in ds])
serialize_dataset = serialize_cache
# sha3 hash function, outputs 64 bytes
def sha3_512(x):
return hash_words(lambda v: sha3.sha3_512(v).digest(), 64, x)
def sha3_256(x):
return hash_words(lambda v: sha3.sha3_256(v).digest(), 32, x)
def xor(a, b):
return a ^ b
def isprime(x):
for i in range(2, int(x**0.5)):
if x % i == 0:
return False
return True
Data Sizes
The following lookup tables provide approximately 2048 tabulated epochs of data sizes and cache sizes.Copy
Ask AI
def get_datasize(block_number):
return data_sizes[block_number // EPOCH_LENGTH]
def get_cachesize(block_number):
return cache_sizes[block_number // EPOCH_LENGTH]
data_sizes = [
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,
5687474048, 5695864448, 5704251008, 5712641408, 5721030272,
5729416832, 5737806208, 5746194304, 5754583936, 5762969984,
5771358592, 5779748224, 5788137856, 5796527488, 5804911232,
5813300608, 5821692544, 5830082176, 5838468992, 5846855552,
5855247488, 5863636096, 5872024448, 5880411008, 5888799872,
5897186432, 5905576832, 5913966976, 5922352768, 5930744704,
5939132288, 5947522432, 5955911296, 5964299392, 5972688256,
5981074304, 5989465472, 5997851008, 6006241408, 6014627968,
6023015552, 6031408256, 6039796096, 6048185216, 6056574848,
6064963456, 6073351808, 6081736064, 6090128768, 6098517632,
6106906496, 6115289216, 6123680896, 6132070016, 6140459648,
6148849024, 6157237376, 6165624704, 6174009728, 6182403712,
6190792064, 6199176064, 6207569792, 6215952256, 6224345216,
6232732544, 6241124224, 6249510272, 6257899136, 6266287744,
6274676864, 6283065728, 6291454336, 6299843456, 6308232064,
6316620928, 6325006208, 6333395584, 6341784704, 6350174848,
6358562176, 6366951296, 6375337856, 6383729536, 6392119168,
6400504192, 6408895616, 6417283456, 6425673344, 6434059136,
6442444672, 6450837376, 6459223424, 6467613056, 6476004224,
6484393088, 6492781952, 6501170048, 6509555072, 6517947008,
6526336384, 6534725504, 6543112832, 6551500672, 6559888768,
6568278656, 6576662912, 6585055616, 6593443456, 6601834112,
6610219648, 6618610304, 6626999168, 6635385472, 6643777408,
6652164224, 6660552832, 6668941952, 6677330048, 6685719424,
6694107776, 6702493568, 6710882176, 6719274112, 6727662976,
6736052096, 6744437632, 6752825984, 6761213824, 6769604224,
6777993856, 6786383488, 6794770816, 6803158144, 6811549312,
6819937664, 6828326528, 6836706176, 6845101696, 6853491328,
6861880448, 6870269312, 6878655104, 6887046272, 6895433344,
6903822208, 6912212864, 6920596864, 6928988288, 6937377152,
6945764992, 6954149248, 6962544256, 6970928768, 6979317376,
6987709312, 6996093824, 7004487296, 7012875392, 7021258624,
7029652352, 7038038912, 7046427776, 7054818944, 7063207808,
7071595136, 7079980928, 7088372608, 7096759424, 7105149824,
7113536896, 7121928064, 7130315392, 7138699648, 7147092352,
7155479168, 7163865728, 7172249984, 7180648064, 7189036672,
7197424768, 7205810816, 7214196608, 7222589824, 7230975104,
7239367552, 7247755904, 7256145536, 7264533376, 7272921472,
7281308032, 7289694848, 7298088832, 7306471808, 7314864512,
7323253888, 7331643008, 7340029568, 7348419712, 7356808832,
7365196672, 7373585792, 7381973888, 7390362752, 7398750592,
7407138944, 7415528576, 7423915648, 7432302208, 7440690304,
7449080192, 7457472128, 7465860992, 7474249088, 7482635648,
7491023744, 7499412608, 7507803008, 7516192384, 7524579968,
7532967296, 7541358464, 7549745792, 7558134656, 7566524032,
7574912896, 7583300992, 7591690112, 7600075136, 7608466816,
7616854912, 7625244544, 7633629824, 7642020992, 7650410368,
7658794112, 7667187328, 7675574912, 7683961984, 7692349568,
7700739712, 7709130368, 7717519232, 7725905536, 7734295424,
7742683264, 7751069056, 7759457408, 7767849088, 7776238208,
7784626816, 7793014912, 7801405312, 7809792128, 7818179968,
7826571136, 7834957184, 7843347328, 7851732352, 7860124544,
7868512384, 7876902016, 7885287808, 7893679744, 7902067072,
7910455936, 7918844288, 7927230848, 7935622784, 7944009344,
7952400256, 7960786048, 7969176704, 7977565312, 7985953408,
7994339968, 8002730368, 8011119488, 8019508096, 8027896192,
8036285056, 8044674688, 8053062272, 8061448832, 8069838464,
8078227328, 8086616704, 8095006592, 8103393664, 8111783552,
8120171392, 8128560256, 8136949376, 8145336704, 8153726848,
8162114944, 8170503296, 8178891904, 8187280768, 8195669632,
8204058496, 8212444544, 8220834176, 8229222272, 8237612672,
8246000768, 8254389376, 8262775168, 8271167104, 8279553664,
8287944064, 8296333184, 8304715136, 8313108352, 8321497984,
8329885568, 8338274432, 8346663296, 8355052928, 8363441536,
8371828352, 8380217984, 8388606592, 8396996224, 8405384576,
8413772672, 8422161536, 8430549376, 8438939008, 8447326592,
8455715456, 8464104832, 8472492928, 8480882048, 8489270656,
8497659776, 8506045312, 8514434944, 8522823808, 8531208832,
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