Ulasan Challenge #6 - Mining Quiz Periode-4

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

Quote from: Dante.444 on October 21, 2018, 01:26:35 PM

* Partisipasi Challenge #6 - Mining Quiz - Periode 4

* Account : Dante.444
* Link Profile : https://bitcointalk.org/index.php?action=profile;u=2312054
* Sudah mengisi Form submit jawaban : Ya

Jawaban salah dan tidak memenuhi syarat*

Quote from: GirL-Miner on October 25, 2018, 09:15:58 PM

* Partisipasi Challenge #6 - Mining Quiz - Periode 4

* Account : GirL-Miner
* Link Profile : https://bitcointalk.org/index.php?action=profile;u=2447454
* Sudah mengisi Form submit jawaban : Ya

Jawaban salah dan tidak memenuhi syarat*

Quote from: sebas7ian on October 28, 2018, 08:47:23 PM

* Partisipasi Challenge #6 - Mining Quiz - Periode 4

* Account : sebas7ian
* Link Profile : https://bitcointalk.org/index.php?action=profile;u=2307690
* Sudah mengisi Form submit jawaban : Ya

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

Quote from: Sectorcleaar on October 31, 2018, 08:12:00 PM

* 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

Jawaban salah dan tidak memenuhi syarat*

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

Pembahasan

Pertanyaan

Quote from: abhiseshakana on July 20, 2018, 12:00:05 PM

Quote

Difficulty (BDiff) Bitcoin diketahui sebesar 623,3869598689275350875461418504115754357567263467498371464103120866973292

1. Dengan menggunakan protocol yang berlaku, maka carilah nilai Target sekarang dalam format Compact 4 Bytes (Bits)

2. Difficulty pada sebuah pool X menggunakan parameter PDiff (Pool Difficulty), dan pool hashrate diketahui sebesar 0.002 Th/s. Jika reward 1 block sebesar 50BTC, berapa jumlah coin (satoshi) yang bisa dihasilkan oleh miner A yang mempunyai avg hasrate sebesar 3 Mh/s, saat mining di PooL X selama 24 Jam ?

Petunjuk :
- Gunakan Protocol Bitcoin
- Untuk hasil Target dalam bentuk decimal (soal No.1), abaikan nilai dibelakang tanda koma
- https://www.calculator.net/big-number-calculator.html
- https://www.mobilefish.com/services/big_number/big_number.php

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)