//

// BRBCashParams.c

// BRCore

//

// Created by Aaron Voisine on 3/11/19.

// Copyright © 2019 breadwallet. All rights reserved.

//

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights

// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in

// all copies or substantial portions of the Software.

//

// THE 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.

#include "support/BRInt.h"

#include "support/BRSet.h"

#include "bitcoin/BRPeer.h"

#include "BRBCashParams.h"

static const char *BRBCashDNSSeeds[] = {

"seed-abc.breadwallet.com.",

"seed.bitcoinabc.org.",

"seed-abc.bitcoinforks.org.",

"seed.bitcoinunlimited.info.",

"seed.bitprim.org.",

"seed.deadalnix.me.",

NULL

};

static const char *BRBCashTestNetDNSSeeds[] = {

"testnet-seed-abc.breadwallet.com",

"testnet-seed.bitcoinabc.org",

"testnet-seed-abc.bitcoinforks.org",

"testnet-seed.bitprim.org",

"testnet-seed.deadalnix.me",

"testnet-seeder.criptolayer.net",

NULL

};

static const BRCheckPoint BRBCashTestNetCheckpoints[] = {

{ 0, uint256("000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943"), 1296688602, 0x1d00ffff },

{ 100800, uint256("0000000000a33112f86f3f7b0aa590cb4949b84c2d9c673e9e303257b3be9000"), 1376543922, 0x1c00d907 },

{ 201600, uint256("0000000000376bb71314321c45de3015fe958543afcbada242a3b1b072498e38"), 1393813869, 0x1b602ac0 },

{ 302400, uint256("0000000000001c93ebe0a7c33426e8edb9755505537ef9303a023f80be29d32d"), 1413766239, 0x1a33605e },

{ 403200, uint256("0000000000ef8b05da54711e2106907737741ac0278d59f358303c71d500f3c4"), 1431821666, 0x1c02346c },

{ 504000, uint256("0000000000005d105473c916cd9d16334f017368afea6bcee71629e0fcf2f4f5"), 1436951946, 0x1b00ab86 },

{ 604800, uint256("00000000000008653c7e5c00c703c5a9d53b318837bb1b3586a3d060ce6fff2e"), 1447484641, 0x1a092a20 },

{ 705600, uint256("00000000004ee3bc2e2dd06c31f2d7a9c3e471ec0251924f59f222e5e9c37e12"), 1455728685, 0x1c0ffff0 },

{ 806400, uint256("0000000000000faf114ff29df6dbac969c6b4a3b407cd790d3a12742b50c2398"), 1462006183, 0x1a34e280 },

{ 907200, uint256("0000000000166938e6f172a21fe69fe335e33565539e74bf74eeb00d2022c226"), 1469705562, 0x1c00ffff },

{ 1008000, uint256("000000000000390aca616746a9456a0d64c1bd73661fd60a51b5bf1c92bae5a0"), 1476926743, 0x1a52ccc0 },

{ 1108800, uint256("00000000000288d9a219419d0607fb67cc324d4b6d2945ca81eaa5e739fab81e"), 1490751239, 0x1b09ecf0 },

{ 1209600, uint256("0000000000083e8da119a0dee60f7d8925488f43a9f3591fef0cf8c3b1a86887"), 1517992679, 0x1c01bbf5 },

{ 1310400, uint256("00000000066c529e690ef631773ff540866188a6c6509c73dfc87bc2979322c2"), 1561313963, 0x1c096cde }

};

// blockchain checkpoints - these are also used as starting points for partial chain downloads, so they must be at

// difficulty transition boundaries in order to verify the block difficulty at the immediately following transition

static const BRCheckPoint BRBCashCheckpoints[] = {

{ 0, uint256("000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"), 1231006505, 0x1d00ffff },

{ 20160, uint256("000000000f1aef56190aee63d33a373e6487132d522ff4cd98ccfc96566d461e"), 1248481816, 0x1d00ffff },

{ 40320, uint256("0000000045861e169b5a961b7034f8de9e98022e7a39100dde3ae3ea240d7245"), 1266191579, 0x1c654657 },

{ 60480, uint256("000000000632e22ce73ed38f46d5b408ff1cff2cc9e10daaf437dfd655153837"), 1276298786, 0x1c0eba64 },

{ 80640, uint256("0000000000307c80b87edf9f6a0697e2f01db67e518c8a4d6065d1d859a3a659"), 1284861847, 0x1b4766ed },

{ 100800, uint256("000000000000e383d43cc471c64a9a4a46794026989ef4ff9611d5acb704e47a"), 1294031411, 0x1b0404cb },

{ 120960, uint256("0000000000002c920cf7e4406b969ae9c807b5c4f271f490ca3de1b0770836fc"), 1304131980, 0x1b0098fa },

{ 141120, uint256("00000000000002d214e1af085eda0a780a8446698ab5c0128b6392e189886114"), 1313451894, 0x1a094a86 },

{ 161280, uint256("00000000000005911fe26209de7ff510a8306475b75ceffd434b68dc31943b99"), 1326047176, 0x1a0d69d7 },

{ 181440, uint256("00000000000000e527fc19df0992d58c12b98ef5a17544696bbba67812ef0e64"), 1337883029, 0x1a0a8b5f },

{ 201600, uint256("00000000000003a5e28bef30ad31f1f9be706e91ae9dda54179a95c9f9cd9ad0"), 1349226660, 0x1a057e08 },

{ 221760, uint256("00000000000000fc85dd77ea5ed6020f9e333589392560b40908d3264bd1f401"), 1361148470, 0x1a04985c },

{ 241920, uint256("00000000000000b79f259ad14635739aaf0cc48875874b6aeecc7308267b50fa"), 1371418654, 0x1a00de15 },

{ 262080, uint256("000000000000000aa77be1c33deac6b8d3b7b0757d02ce72fffddc768235d0e2"), 1381070552, 0x1916b0ca },

{ 282240, uint256("0000000000000000ef9ee7529607286669763763e0c46acfdefd8a2306de5ca8"), 1390570126, 0x1901f52c },

{ 302400, uint256("0000000000000000472132c4daaf358acaf461ff1c3e96577a74e5ebf91bb170"), 1400928750, 0x18692842 },

{ 322560, uint256("000000000000000002df2dd9d4fe0578392e519610e341dd09025469f101cfa1"), 1411680080, 0x181fb893 },

{ 342720, uint256("00000000000000000f9cfece8494800d3dcbf9583232825da640c8703bcd27e7"), 1423496415, 0x1818bb87 },

{ 362880, uint256("000000000000000014898b8e6538392702ffb9450f904c80ebf9d82b519a77d5"), 1435475246, 0x1816418e },

{ 383040, uint256("00000000000000000a974fa1a3f84055ad5ef0b2f96328bc96310ce83da801c9"), 1447236692, 0x1810b289 },

{ 403200, uint256("000000000000000000c4272a5c68b4f55e5af734e88ceab09abf73e9ac3b6d01"), 1458292068, 0x1806a4c3 },

{ 423360, uint256("000000000000000001630546cde8482cc183708f076a5e4d6f51cd24518e8f85"), 1470163842, 0x18057228 },

{ 443520, uint256("00000000000000000345d0c7890b2c81ab5139c6e83400e5bed00d23a1f8d239"), 1481765313, 0x18038b85 },

{ 463680, uint256("000000000000000000431a2f4619afe62357cd16589b638bb638f2992058d88e"), 1493259601, 0x18021b3e },

{ 483840, uint256("00000000000000000098963251fcfc19d0fa2ef05cf22936a182609f8d650346"), 1503802540, 0x1803c5d5 },

{ 504000, uint256("0000000000000000006cdeece5716c9c700f34ad98cb0ed0ad2c5767bbe0bc8c"), 1510516839, 0x18021abd },

{ 524160, uint256("0000000000000000003f40db0a3ed4b4d82b105e212166b2db498d5688bac60f"), 1522711454, 0x18033b64 },

{ 544320, uint256("000000000000000001619f65f7d5ef7a06ee50d2b459cdf727d74b2a7a762268"), 1534794998, 0x18022f7e },

{ 564480, uint256("0000000000000000020f6ec365b859c7160fbab65652dfc8b52a2664f8ba1e48"), 1546969567, 0x18058b4b },

{ 584640, uint256("000000000000000001d07b1281321b5aa04506e6630dc1e66cf0ad0324d0533c"), 1559087892, 0x18039060 },

{ 604800, uint256("0000000000000000014c579c6ec5dcaf3ed526c5391509c9860b34ed465500a0"), 1571195602, 0x18033efa }

};

static const BRMerkleBlock *_medianBlock(const BRMerkleBlock *b, const BRSet *blockSet)

{

const BRMerkleBlock *b0 = NULL, *b1 = NULL, *b2 = b;

b1 = (b2) ? BRSetGet(blockSet, &b2->prevBlock) : NULL;

b0 = (b1) ? BRSetGet(blockSet, &b1->prevBlock) : NULL;

if (b0 && b2 && b0->timestamp > b2->timestamp) b = b0, b0 = b2, b2 = b;

if (b0 && b1 && b0->timestamp > b1->timestamp) b = b0, b0 = b1, b1 = b;

if (b1 && b2 && b1->timestamp > b2->timestamp) b = b1, b1 = b2, b2 = b;

return (b0 && b1 && b2) ? b1 : NULL;

}

static int BRBCashVerifyDifficulty(const BRMerkleBlock *block, const BRSet *blockSet)

{

const BRMerkleBlock *b, *first, *last;

int i, sz, size = 0x1d;

uint64_t t, target, w, work = 0;

int64_t timespan;

assert(block != NULL);

assert(blockSet != NULL);

if (block && block->height >= 504032) { // D601 hard fork height: https://reviews.bitcoinabc.org/D601

last = BRSetGet(blockSet, &block->prevBlock);

last = _medianBlock(last, blockSet);

for (i = 0, first = block; first && i <= 144; i++) {

first = BRSetGet(blockSet, &first->prevBlock);

}

first = _medianBlock(first, blockSet);

if (! first) return 1;

timespan = (int64_t)last->timestamp - first->timestamp;

if (timespan > 288*10*60) timespan = 288*10*60;

if (timespan < 72*10*60) timespan = 72*10*60;

for (b = last; b != first;) {

// target is in "compact" format, where the most significant byte is the size of the value in bytes, next

// bit is the sign, and the last 23 bits is the value after having been right shifted by (size - 3)*8 bits

sz = b->target >> 24, t = b->target & 0x007fffff;

// work += 2^256/(target + 1)

w = (t) ? ~0ULL/t : ~0ULL;

while (sz < size) work >>= 8, size--;

while (size < sz) w >>= 8, sz--;

while (work + w < w) w >>= 8, work >>= 8, size--;

work += w;

b = BRSetGet(blockSet, &b->prevBlock);

}

// work = work*10*60/timespan

while (work > ~0ULL/(10*60)) work >>= 8, size--;

work = work*10*60/timespan;

// target = (2^256/work) - 1

while (work && ~0ULL/work < 0x8000) work >>= 8, size--;

target = (work) ? ~0ULL/work : ~0ULL;

while (size < 1 || target > 0x007fffff) target >>= 8, size++; // normalize target for "compact" format

target |= size << 24;

if (target > 0x1d00ffff) target = 0x1d00ffff; // max proof-of-work

if (target - block->target > 1) return 0;

}

return 1;

}

static int BRBCashTestNetVerifyDifficulty(const BRMerkleBlock *block, const BRSet *blockSet)

{

return 1; // XXX skip testnet difficulty check for now

}

static const BRChainParams BRBCashParamsRecord = {

BRBCashDNSSeeds,

8333, // standardPort

0xe8f3e1e3, // magicNumber

SERVICES_NODE_BCASH, // services

BRBCashVerifyDifficulty,

BRBCashCheckpoints,

sizeof(BRBCashCheckpoints)/sizeof(*BRBCashCheckpoints),

{ BITCOIN_PUBKEY_PREFIX, BITCOIN_SCRIPT_PREFIX, BITCOIN_PRIVKEY_PREFIX, NULL },

BCASH_FORKID

};

const BRChainParams *BRBCashParams = &BRBCashParamsRecord;

static const BRChainParams BRBCashTestNetParamsRecord = {

BRBCashTestNetDNSSeeds,

18333, // standardPort

0xf4f3e5f4, // magicNumber

SERVICES_NODE_BCASH, // services

BRBCashTestNetVerifyDifficulty,

BRBCashTestNetCheckpoints,

sizeof(BRBCashTestNetCheckpoints)/sizeof(*BRBCashTestNetCheckpoints),

{ BITCOIN_PUBKEY_PREFIX_TEST, BITCOIN_SCRIPT_PREFIX_TEST, BITCOIN_PRIVKEY_PREFIX_TEST, NULL },

BCASH_FORKID

};

const BRChainParams *BRBCashTestNetParams = &BRBCashTestNetParamsRecord;