Topic: [CHALLENGE] Merit Challenge Lokal Board Indonesia | RESMI & RUNNING (Read 6984 times)

Bump.

Bump. Kalau tidak ada yang mengikuti challenge yang ada selama 1 minggu ke depan, thread ini akan ane kunci lebih dulu setelah memaparkan jawaban atas challenge mengenai tanya jawab Bitcoin.

Bump.

mau ikut, tapi masih newbie..

Masihkah saya bisa mengikuti challenge ini?
Terimakasih.

Ulasan Challenge #6 - Mining Quiz Periode-5

- Archived
- Jumlah partisipan : 2
- Link jawaban peserta quiz : Sheets Jawaban


Jawaban salah dan tidak memenuhi syarat* (No reward)



Jawaban benar 1, tetapi tidak memenuhi syarat* (No reward)


* Rules : Setiap jawaban harus diuraikan dengan jelas (harus ada langkah-langkah pengerjaannya)

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Pembahasan


Pertanyaan :




Jawaban :

1. Merubah ke-6 fields diatas dengan melakukan swap endian (reverse per Byte). Supaya tidak terjadi kesalahan penulisan data, lebih mudah jika Hex digit dipisahkan per 1 byte (2 Hex digits)

- Convert Version ke hex, lalu lakukan swap endian (reverse per Byte)

	Version		536870912
	Version (Hex)		20 00 00 00
	Reverse		00 00 00 20

- Lakukan swap endian (reverse per Byte) pada Previous Block

	Previous Block		00 00 00 00 00 00 00 00 2a c7 f2 0c 4b 90 9f 58 57 d3 36 37 00 d3 64 89 58 fd 46 75 be b5 34 a2
	Reverse		a2 34 b5 be 75 46 fd 58 89 64 d3 00 37 36 d3 57 58 9f 90 4b 0c f2 c7 2a 00 00 00 00 00 00 00 00
	Reverse		a234b5be7546fd588964d3003736d357589f904b0cf2c72a0000000000000000

- Reverse Merkle Root (swap endian)

	Merkle Root		e0 4a 3b 04 3d 76 ac e0 78 28 3d b0 ff 61 91 0f 61 cb 06 a6 85 f5 a3 de e0 70 1d 48 c0 64 c9 f4
	Reverse		f4 c9 64 c0 48 1d 70 e0 de a3 f5 85 a6 06 cb 61 0f 91 61 ff b0 3d 28 78 e0 ac 76 3d 04 3b 4a e0
	Reverse		f4c964c0481d70e0dea3f585a606cb610f9161ffb03d2878e0ac763d043b4ae0

- Merubah bentuk waktu ke (epoch) timestamp, lalu convert to Hex dan lakukan swap endian (reverse).

	Time		2018-Nov-08 22:28:09
	Timestamp		1541716089 (https://timestampgenerator.com)
	Timestamp (Hex)		5be4b879
	Reverse		79b8e45b

- Merubah Bits ke bentuk Hex, lalu lakukan swap endian (reverse)

	Bits		420106321
	Bits (Hex)		190a5051
	Reverse		51500a19

- Merubah Nonce ke bentuk Hex, lalu lakukan swap endian (reverse)

	Nonce		3021489935
	Nonce (Hex)		b418470f
	Reverse		0f4718b4

- Mencari nilai Header_Hex = Rev Version + Rev Prev Block + Rev Merkle Root + Rev Timestamp + Rev Rev Bits + Rev Nonce
Header_Hex = 00000020 + a234b5be7546fd588964d3003736d357589f904b0cf2c72a0000000000000000 + f4c964c0481d70e0dea3f585a606cb610f9161ffb03d2878e0ac763d043b4ae0 + 79b8e45b + 51500a19 + 0f4718b4

- Melakukan double hashing pada Header_Hex, dan untuk final hash harus dilakukan swap endian (reverse)

	Double Hashing Sha256		= Sha256 (sha256 (Header_Hex))
	Block hash		= Reverse (Double Hashing Sha256)

# Cara 1 menggunakan calculator dari http://extranet.cryptomathic.com/hashcalc/index
sha256 (Header_Hex) = Sha256(00000020a234b5be7546fd588964d3003736d357589f904b0cf2c72a0000000000000000f4c964c 0481d70e0dea3f585a606cb610f9161ffb03d2878e0ac763d043b4ae079b8e45b51500a190f4718 b4)

sha256 (Header_Hex) = 9693d04d327f184ebf97e70995ac1b844cf79c9231b449095a1030887c8e2732



Sha256 (Sha256 (Header_Hex) = Sha256 (9693d04d327f184ebf97e70995ac1b844cf79c9231b449095a1030887c8e2732)
Double Hashing Sha256    = 04b1bccf8b83dbac2921233c100132d07515ecbfd18f23cc0100000000000000
Double Hashing Sha256    = 04 b1 bc cf 8b 83 db ac 29 21 23 3c 10 01 32 d0 75 15 ec bf d1 8f 23 cc 01 00 00 00 00 00 00 00



Lalu lakukan swap endian (reverse per Byte) untuk Final Hash
Block hash      = 00 00 00 00 00 00 00 01 cc 23 8f d1 bf ec 15 75 d0 32 01 10 3c 23 21 29 ac db 83 8b cf bc b1 04
Block hash      = 0000000000000001cc238fd1bfec1575d03201103c232129acdb838bcfbcb104



# Cara 2 melakukan double Hashing dengan Python :

>>> import hashlib, binascii
>>> from binascii import unhexlify
>>> from hashlib import sha256
>>> header = unhexlify("00000020a234b5be7546fd588964d3003736d357589f904b0cf2c72a0000000000000000f4c964c 0481d70e0dea3f585a606cb610f9161ffb03d2878e0ac763d043b4ae079b8e45b51500a190f4718 b4")
>>> sha256(sha256(header).digest()).hexdigest()



Result       = '04b1bccf8b83dbac2921233c100132d07515ecbfd18f23cc0100000000000000' >>> (Swap endian / Reverse per Byte)
Block hash   = 0000000000000001cc238fd1bfec1575d03201103c232129acdb838bcfbcb104


Valid Proof :

https://explorer.litecoinca.sh/block/0000000000000001cc238fd1bfec1575d03201103c232129acdb838bcfbcb104



2. Diketahui Bits = 420106321 = 190a5051
Target = Coefficient * 2^(8 * (exponent - 3)
Target = 0x0a5051 * 2^(8 * (0x19 - 3)
Target = 675.921 * 2^(8 * (25 - 3)
Target = 675.921 * 95.780.971.304.118.053.647.396.689.196.894.323.976.171.195.136.475.136
Target = 64.740.369.904.850.778.939.402.017.558.654.008.356.297.610.387.841.410.400.256

Convert to Hex and recall 256 Bit
Hex Target = 0a 5051 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 (25 Bytes)
Hex Target = 0000 0000 0000 000a 5051 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 (32 Bytes)

Difficulty_1_target = 0x00000000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF (PDiff)
Difficulty = difficulty_1_target / current_target
Difficulty = 0x00000000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF / 0x000000000000000a505100000000000000000000000000000000000000000000
Difficulty = 26.959.946.667.150.639.794.667.015.087.019.630.673.637.144.422.540.572.481.103. 610.249.215 / 64.740.369.904.850.778.939.402.017.558.654.008.356.297.610.387.841.410.400.256
Difficulty = 416.431.767,48563219

Block Time = Difficulty * 2^32 / Hashrate
Block Time = 416.431.767,48563219 * 2^32 / 2.000.000.000.000.000 h/s
Block Time = 894,28 second = 14 minute 54,28 second

Block Found (1 Day) = 24 Hour / 894,28 second
Block Found (1 Day) = 86.400 / 894.28
Block Found (1 Day) = 96,6 = 97 Blocks (Average)

 


Ref :
https://en.bitcoin.it/wiki/Block_hashing_algorithm
https://en.bitcoin.it/wiki/Difficulty
https://timestampgenerator.com/
https://www.mobilefish.com/services/big_number/big_number.php
http://extranet.cryptomathic.com/hashcalc/index

* Partisipasi Challenge #6 - Mining Quiz - Periode 5

* Account : Dante.444
* Link Profile : https://bitcointalksearch.org/user/dante444-2312054
* Sudah mengisi Form submit jawaban : Ya

#Partisipasi Challenge #5

Pertanyaan: #3 & #4
Nama akun: flyeers309
Link profile akun: https://bitcointalksearch.org/user/flyeers309-2431704
Challenge yang diikuti: Tanya jawab seputar Bitcoin.
Sudah mengisi google form?: Ya.

#Partisipasi Challenge #5
Pertanyaan #2
Nama akun:  Anjing_lu https://bitcointalksearch.org/user/anjinglu-2434082
Challenge yang diikuti: Tanya jawab seputar Bitcoin.
Sudah mengisi google form?: Ya.

Challenge tanya jawab seputar bitcoin batch #2 sudah dibuka. Silakan berpartisipasi.

https://bitcointalksearch.org/topic/m.35321526

* Partisipasi Challenge #6 - Mining Quiz - Periode 5

* Account : GirL-Miner
* Link Profile : https://bitcointalksearch.org/user/girl-miner-2447454
* Sudah mengisi Form submit jawaban : Ya

Challenge #6 - Mining Quiz | Periode-5 | On-Going


Untuk detail (syarat, rules, petunjuk, dll) Quiz bisa dilihat disini Challenge #6 - Mining Quiz | Periode-5 | On-Going

Ulasan Challenge #6 - Mining Quiz Periode-4

- Archived
- Jumlah partisipan : 4
- Link jawaban peserta quiz : Sheets Jawaban




Jawaban salah dan tidak memenuhi syarat*



Jawaban salah dan tidak memenuhi syarat*



Jawaban keduanya benar (reward merit +5 by @dbshck)



Jawaban salah dan tidak memenuhi syarat*


* Rules : Setiap jawaban harus diuraikan dengan jelas (harus ada langkah-langkah pengerjaannya)

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Pembahasan


Pertanyaan



Jawaban

1. Diketahui
Difficulty (BDiff) = 623,3869598689275350875461418504115754357567263467498371464103120866973292
Difficulty_1_Target (BDiff) = 0000 0000 FFFF 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 (32 Bytes)
Convert Hex To Decimal = 2,6959535291011E+67
= 26.959.535.291.011.309.493.156.476.344.723.991.336.010.898.738.574.164.086.137. 773.096.960

Current Target = Difficulty_1_Target (BDiff) : Difficulty
= 26.959.535.291.011.309.493.156.476.344.723.991.336.010.898.738.574.164.086.137. 773.096.960 / 623,3869598689275350875461418504115754357567263467498371464103120866973292
= 43.246.870.766.561.725.070.861.386.869.077.695.524.372.774.526.710.079.316.876. 591.104,00000000007833149065
= 43.246.870.766.561.725.070.861.386.869.077.695.524.372.774.526.710.079.316.876. 591.104


Convert Decimal to Hex (43.246.870.766.561.725.070.861.386.869.077.695.524.372.774.526.710.079.316.876. 591.104)
= 69 2098 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 (27 Bytes)
1 Byte = 2 Hex Character
27 Bytes = 54 Hex Character
27 Bytes (in Decimal) = 1B Bytes (in Hex)

- Bits (Target) : Current Target dalam Compact Format (32 bits / 4 Bytes / 8 Hex Character) (https://bitcoin.org/en/developer-reference#target-nbits)
- Struktur target (Bits) 0xEECCCC terdiri dari EE = exponent dan CCCC = coefficient (significand),
- Target 69 2098 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 (27 Bytes), dimana byte pertama 69 (105) lebih kecil dari 7F (127) maka tidak perlu ditambahkan zero digit sehingga ukurannya tetap 27 bytes.

Maka :
exponent = 27 Bytes (convert decimal form to hex form) = 1B = 0x1B
coefficient = 692098 = 0x692098.
Sehingga didapat Target (Bits) : 0x1B692098 = 1B692098

Proof :
Target = coefficient * 2^(8 * (exponent – 3))
= 0x692098 * 2 ^ (0x08 * (0x1B - 0x03) >>>> Convert Hex to Decimal
= 6.889.624 * 2 ^ (8 * (27 - 3))
= 6.889.624 * 2 ^ (192)
= 43.246.870.766.561.725.070.861.386.869.077.695.524.372.774.526.710.079.316.876. 591.104

Jadi untuk nilai target Bits (4 Bytes) adalah 1B692098
(Valid Proof bisa dilihat pada Block 77777 https://blockexplorer.com/block/00000000005f2ffd0a95ae6d0f96c82782093debe7118af13debfbf5d5e69b86)




2. Diketahui
Target (Bits) = 1B692098
Recall 256 Bit (32 Byte) = 0000 0000 0069 2098 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
Hex to Decimal = 43.246.870.766.561.725.070.861.386.869.077.695.524.372.774.526.710.079.316.876. 591.104

Difficulty_1_Target (PDiff) = 0000 0000 FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF
Hex to Decimal = 26.959.946.667.150.639.794.667.015.087.019.630.673.637.144.422.540.572.481.103. 610.249.215

Difficulty (PDiff) = Difficulty_1_Target (Non-truncated target) : Current Target (256 Bit)
Difficulty (PDiff) = 0000 0000 FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF / 0000 0000 0069 2098 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000
= 26.959.946.667.150.639.794.667.015.087.019.630.673.637.144.422.540.572.481.103. 610.249.215 / 43.246.870.766.561.725.070.861.386.869.077.695.524.372.774.526.710.079.316.876. 591.104
= 623,39647214

Pool Hashrate = 0.002 Th/s = 2 Gh/s = 2.000.000.000 h/s
Difficulty (PDiff) = 623,39647214
Reward = 50 BTC

Block Time = difficulty * 2^32 / hashrate
= 623,39647214 * 4.294.967.296 / 2.000.000.000
= 1.338,7337 detik = 22,31222883569 Menit

24 Jam = 24 x 60 Menit = 1440 Menit
Est. Block found 24H =  1440 : 22,31222883569 = 64,538599465
Est. Block/Hash (24H) = 64,538599465 : 2.000.000.000 = 0,0000000322692997325 Block

Miner A Hashrate = 3 Mh/s = 3.000.000 h/s
Block found 24 H = 0,0000000322692997325 * 3.000.000 = 0,0968078992 Block
BTC earn 24 H = 0,0968078992 * 50 BTC = 4,84039496 BTC = 484.039.496 Satoshi

Jadi dalam sehari Miner A akan mendapatkan hasil mining sekitar 484.039.496 Satoshi (4,84039496 BTC)

Proof :
https://www.coinwarz.com/calculators/bitcoin-mining-calculator/?h=0.003&p=1320.00&pc=0.10&pf=0.00&d=623.39647214&r=50&er=6579.00000000&hc=0.00





Ref :
https://en.bitcoin.it/wiki/Difficulty
https://blockexplorer.com/block/00000000005f2ffd0a95ae6d0f96c82782093debe7118af13debfbf5d5e69b86
https://www.calculator.net/big-number-calculator.html
https://www.mobilefish.com/services/big_number/big_number.php
https://www.coinwarz.com/calculators/bitcoin-mining-calculator/

Credit to :
@dbshck (untuk reward Quiz)

* Partisipasi Challenge #6 - Mining Quiz - Periode 4

* Account : Sectorcleaar
* Link Profile :https://bitcointalk.org/index.php?action=profile;u=2039425
* Sudah mengisi Form submit jawaban : Ya

Ralat pak jawaban nomer 2 saya ubah , karna keburu kepencet saat submit form . Jawaban baru saya kirim di PM pak

* Partisipasi Challenge #6 - Mining Quiz - Periode 4

* Account : sebas7ian
* Link Profile : https://bitcointalksearch.org/user/sebas7ian-2307690
* Sudah mengisi Form submit jawaban : Ya

* Partisipasi Challenge #6 - Mining Quiz - Periode 4

* Account : GirL-Miner
* Link Profile : https://bitcointalksearch.org/user/girl-miner-2447454
* Sudah mengisi Form submit jawaban : Ya

* Partisipasi Challenge #6 - Mining Quiz - Periode 4

* Account : Dante.444
* Link Profile : https://bitcointalksearch.org/user/dante444-2312054
* Sudah mengisi Form submit jawaban : Ya

Challenge #6 - Mining Quiz diperpanjang 1 Minggu (dengan alasan jumlah partisipan saat ini cuma 2 member saja (dari kuota 7 partisipan))

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Note :

- Untuk ulasan Quiz akan saya uraikan pada tanggal 11 Oktober 2018.

- Untuk 2 partisipan pertama tidak bisa mengikuti Quiz (Extra Time) ini lagi.

- Untuk 2 partisipan yang jawabannya sudah masuk, reward akan saya kasih sekarang dengan ketentuan sbb :


Jawaban benar : Tidak ada
Reward merit : -



Jawaban benar : 1 Soal
Reward : 1 Merit (done)

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Update :

Partisipan

 


Challenge #6 Mining - Quiz (Periode 3) : Archived


Soal (Pertanyaan)


Jawaban

1. Diketahui :
- Global Hashrate = 77 Gh/s
- Block Time = 10 menit = 600 detik
- Difficulty = (Hashrate * Block time) : 2**32
- Difficulty = (77.000.000.000 * 600) : 4.294.967.296 = 10.756,776
(Ref : https://en.bitcoin.it/wiki/Difficulty)

2. Diketahui :
- Difficulty change 2016 Block
- Block time 2016 Block = 15 hari = 21.600 Menit
- Current Difficulty = Old diff * (2016 * 10 menit) : Block time Last 2016 Block
- Old difficulty = Current Diff * Block time Last 2016 Block : 20.160
- Old difficulty = 10.756,776 * 21.600 : 20.160 = 11.525,117
(Ref : http://learnmeabitcoin.com/guide/difficulty)

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Update :

Challenge #6 - Mining Quiz | Periode-4 On-Going!

Buat calon partisipan yang berminat, silahkan menuju ke sini https://bitcointalksearch.org/topic/m.42537165


(Note : ini adalah post bump, dan akan saya hapus saat pelaksanaan quiz selesai / ada post bump yang baru)

 

Silahkan, jumlah postingan bukan penilaian. Semakin banyak malah semakin buruk.

#Partisipasi Challenge: Bruteforce Sederhana dan Sign Message
(challenge 4)

Sebetulnya ane ingin memberikan petunjuk, tapi nanti tidak fair dan tidak seru.
Yang bisa ane katakan hanya agan hanya kurang satu tahap lagi, cara agan akan berhasil di challenge no 1, 3, dan 5, tapi tidak pada challenge ini.
Semangat! Kalau teliti ada petunjuknya di update postingan ane selanjutnya dan lanjutkan dengan googling sedikit.

Edit: hasilnya dihapus saja biar tidak dicontek member lain.