1 Background

An important indicator of bitcoin mining is power-consumption ratio,
higher power-consumption ratio, higher income.

 This document introduces multi midstate mode, A scheme to Improve the power-consumption ratio of Mining:

Solution: change the value of the block version.
The feasibility of the scheme is based on: In the bitcoin protocol, the
bitcoin network (bitcoind nodes) allows at least two version(or even
higher version of block). Some bits of the version fields can be
redefined to identify the midstate.

This document is based on bitmain chip protocol, but the principle of
scheme is the same throughout.
2 Scheme principle analysis
2.1.1 The basic principle of bitcoin mining
Necessary parameter:
 Block version: version
 Hash value of the previous block : prev_hash
 The value of the hash tree for the transaction to be
packaged: merkle_hash
 Update time: ntime
 Current difficulty: nbits
The length of each parameter is as follows:
Version
(4 bytes)
Prev_has
h
(32
bytes)
Merkle_ha
sh
(32 bytes)
Ntime
(4 bytes)
Nbits
(4 bytes)
Nonce
(4 bytes)
2.1.2 Mining operation formula
The mining process is to find a suitable nonce value, makes the
following formula was established:
SHA256(SHA256(version + prev_hash + merkle_hash + ntime +
nbits + nonce)) < TARGET
 The range of nonce values is 0~2^32
 TARGET can be calculated according to the current
difficulty=current difficulty/(2^32)。
 Because of the discrete random characteristics of hash
algorithm, to find such a nonce value meets the formula,
traversal search is the only way.
2.1.3 operation process
 Generate midstate：
version + prev_hash + high 28 bytes of merkle_hash：make an hash
to generate midstate。
 Generate work：
Low 4 bytes Merkle_hash + ntime + nbits = data2。
Midstate + 20 bytes 0x0 + data2 = work。
2.2Principle of multi midstate
2.2.1 Mining process
The operation process of bitcoin mining chip as below:
The design ideas are as follows：
1) In N cycles, date2 remains unchanged. In those cycles, the
extended circuit can be closed. N=The number of midstate.
2) By changing version to generate N midstate.
3) Each midstate can make an operation with data2.
As you can see, in 1) turning off the extended circuit periodically can
save the power consumption.
2.2.2 parameter analysis
We know that prev_hash can not be arbitrarily changed, the hash
Merkle_hash is divided for two parts are used in the midstate and
Data
+
constant
midstate
Second hash
extend
compress
First hash
W0 W1 W2 ...... W63
data2 in the, to find a midstate correspond to the same data2, the
only way is changing the version. in the bitcoin protocol, the bitcoin
network (bitcoind nodes) allows at least two version(or even higher
version of block), So proposed this scheme.
Because more than one midstate shared the same data2, so in the
theory when the number of midstate is N, the expansion of the
circuit part of the power consumption will be 1/N.
3 Adaptation of pool
3.1Reason
Change version to generate mulit midstate is completely done by miner. So
Pool need to know the version of nonce which submitted by multi
midstate miner. Then pool can be based on the version information
to restore the complete, correct block data and broadcast out
3.2API definition
Pool customization requirements:
1. Added multi midstate mode query instruction:
In the authentication stage miner will be sent to the pool: {"id": id,
"method": "mining.multi_midstate", "params": midstate_num } if
pool supported multi-midstate mode reply ： {"id": id, "method":
"mining.midstate_change", "params": ["0x00000004",
"0x04000004","0x08000004","0x0C000004"]}, Doesn't relay or
replay error means doesn't support this mode.
2. Pool side only send the current version of the job, miner
change the version itself.
3. Submit protocol need to add version information ：{"params":
["worker_name", "job_id", "nonce2", "ntime", "nonce",
"version"], "id": 6, "method": "mining.submit"}.
4 Recommendations to bitcoin
community
According to the development of bitcoin, the 4 byte (32bits) width of
the version field is completely redundant. ， This multi midstate
scheme can be used as a kind of open universal technology scheme,
can improve the efficiency of the whole network.
This scheme will submit multiple versions of block to the
network ， In order to avoid the forks risk ， we wish to make the
following proposals.：
1. Select N bits from version as midstate mask ，Use only in check,
not as a real version number. suggest N=2。
2. Definition version mask ： 0x0C000000 （ N=2 ） ， Used for block
block version number extraction 。（Note: in the Classic version,
version has used some bits as other uses）
3. Base on stratum protocol add or change the following
instructions：
 Multi midstate query instruction：{"id": id, "method":
"mining.multi_midstate", "params": midstate_num } miner volunteer
to submit the number of midstate.
 Multi midstate query instruction response：{"id": id,
"method": "mining.midstate_change", "params": ["0x00000004",
"0x04000004","0x08000004","0x0C000004"]} Pool decides which
version to use in the end.
 Multi midstate submit nonce instruction ：{"params":
["worker_name", "job_id", "nonce2", "ntime", "nonce", "version"],
"id": id, "method": "mining.submit"}

- About "any safe no KYC swap/exchange" and your question about how BTC to DAI can be done, I would advise you to use eXch, as it's without KYC, without account to create and no logs. Reliable since 2014.
You could use Changenow.io too for example, but it is less safe IMO as they operate AML verifications, and shared information with some gov agencies in the past IIRC.

-DAI is reliable as a stable coin IMO, at least it is the best (even if unperfected) stablecoin available for now. Cannot be frozen or seized in your wallet like USDT or USDC.

-For the crypto card, Wirex is cool (low fees) but KYC is mandatory. ID + POA.

-Otherwise, you should know that in Europe, if you spend crypto with a crypto card, no matter if it is a stablecoin or not, you will need to pay taxes (at least in 99% of EU countries). As your CEX will do the exchange crypto/fiat for you when you will use your card.

Haha on est pas en Californie ici !

---

Le troisième concours (on peut appeler ça comme ça ? j'ai un doute sur le mot maintenant) est là. 

[FREE RAFFLE] - Custom eXch Cryptosteel Capsule (#3)!

Toujours pas de gagnant FR pour l'instant, on y croit on y croit! 

You can join the third Raffle and try to win a Custom eXch Cryptosteel Capsule!  

[FREE RAFFLE] - Custom eXch Cryptosteel Capsule (#3)!

As you know eXch.cx is a Fully Automatic exchange where the whole process takes less than 1 minute. eXch tries its best to support public initiatives related to the dissemination of information about the basic security of your assets, which is why 20 custom Cryptosteels were purchased for the community! You can take part in one of the upcoming drawings and try to win one of them. We wish everyone good luck in this Raffle!

Summary:

- Pick a slot. New rule: participants with at least 1000 merits can take 2 slots.
- We reserve the right to ignore any participant for any reason.
- Once a block is selected, we will use bitmover’s tool for a fair and transparent draw.

00 - BlackHatCoiner
01 - BlackHatCoiner
02 - Gazeta
03 - doblezero
04 - xandry
05 - Gazeta
06 - Danydee
07 - GrosWesh
08 - Buchi-88
09 - xandry
10 - Danydee
11 - klarki
12 - GrosWesh
13 - Buchi-88
14 - joker_josue
15 - BABY SHOES
16 - shasan
17 - julerz12
18 - bct_ail
19 - NeuroticFish
20 - LoyceV
21 - 2stout
22 - Crypto Library
23 - Wapfika
24 - Mbitr
25 - ChiBitCTy
26 - khaled0111
27 - haloxon
28 - bct_ail
29 -  Mbitr
30 - GxSTxV
31 - jwinterm
32 - jwinterm
33 - klarki
34 - cygan
35 - strunberg
36 - Becassine
37 - seavodin
39 - Bitcoinsummoner
40 - JollyGood
41 - ajiz138
42 - tweetious
43 - cygan
44 - Yoda
45 - FinePoine0
46 - FinePoine0
47 - shahzadafzal
48 - shahzadafzal
49 - shasan
50 - Bd officer
51 - digicoinuser
52 - digicoinuser
53 - krogoth
54 - krogoth
55 - Begru
57 - Asuspawer09
58 - ajiz138
59 - F2b
60 - DenisDenis
61 - GxSTxV
62 - Koal-84
63 - Koal-84
64 - NeuroticFish
65 - ChiBitCTy
66 - julerz12
67 - Bitmover
68 - Bitmover
69 - Jambo
70 - hopenotlate
71 - wwzsocki
72 - hopenotlate
73 - wwzsocki
74 - Willi9974
75 - Willi9974
76 - moparminingllc
77 - Geo
78 - anonymousminer
79 - Geo
80 - gpfrag
81 - G.Seed
82 - Zyro
83 - khaled0111
84 - joker_josue
85 - examplens
86 - examplens
87 - anonymousminer
88 - tg88
89 - Real-Duke
90 - DYING_S0UL
91 - Real-Duke
92 - JollyGood
93 - Mitchell
94 - Mitchell
95 - Albon
96 - Albon
97 - Becassine
98 - icopress
99 - icopress


Prize information

- Free shipping!
- This item will have the eXch logo on it.

Et encore... tu en trouveras toujours qui auront du BTC wrapped sur BNB pour radiner sur les frais 

Maybe because we are thousands of users being satisfied with the service?  

I mean, I never had a single issue with their team and I made a lot of exchanges there.

Ouais en effet tu peux faire cela !

Comme dit, si sur Kraken tu les passes en USDT sur Polygon Network, tu pourras stocker tes USDT sur ton Ledger (toujours mieux que chez Kraken) et ne plus jamais avoir ces problèmes de frais dingues que tu rencontres avec ETH  

Ah ouais je ne savais pas tiens !

La confiance doit être brisée, je me demande comment se portent leurs affaires actuellement

Congrats to Koal-84 !




I will send you a DM soon

---

Thank you to everyone who took part and see you again soon for a new raffle!
Many thanks to eXch!

Ouais elle est toujours à jour (version 122 et des brouettes) : https://packages.debian.org/sid/chromium
Normalement, tant que les dépendances sont satisfaites, peu importe la version de ton OS (je veux dire pour les OS basés sur Debian comme Ubuntu ou Mint par exemple), tu auras accès à la dernière mise-a-jour. Si jamais, il suffit de taper : "sudo apt-get update && sudo apt-get install chromium -y"

Aucune idée pour Windows et Apfel.


Ouais mais de l'eau (et des dizaines de millions de Google $$$$  ) a coulé sous les ponts depuis !

Ok we will go with block #834560

Click here, if you want to verify yourself the draw.

Good luck guys! 

Thank you for the update! Good news! I was not expecting such a fast reaction from their domain provider!

Edit: fixed now

Pour tout ce qui est ETH c'est cher, mais c'est propre à la blockchain ETH, tu ne peux pas y faire grand-chose. Ce lien te dit combien coute une transaction sur la blockchain ETH en temps réel : https://etherscan.io/gastracker

Pour Doge -> USDT, $80 c'est du vol !
J'ai fait le test avec 1000 USD de Doge sur Changenow.io, transaction fees + leur fee ça couterait environ 15 usd, ce n'est pas donné, mais toujours moins hard que 80...


Tu as plein d'options plus ou moins couteuses pour swap des coins. Pour tout ce qui est dispo sur eXch, j'utilise eXch, et pour le reste Changenow des fois (rarement). Je ne sais pas quelle est la meilleure solution pour toi, dans la mesure où je suis prêt à payer des gros frais pour ne pas avoir à fournir mes informations personnelles, je ne connais pas trop les % des gros CEX ces derniers temps.
Mais tu pourras toujours comparer. Il est possible que Binance soit moins cher, mais attention aux frais de retraits après tes swap (frais USDT si tu choisis une blockchain couteuse en gas).  Peut-être que Bestchange pourra répondre à cette question, pas sûr qu'ils soient encore fiables?

Thank you for your participation guys! Raffle is now full 

We will do the draw a little bit later

Ne soyez pas surpris si eXch.cx vous redirige vers exch.pw

Wow what a bunch of assholes! 

I was not aware that it was even possible to be so lazy at work, wtf..
I hope that the situation will be solved asap.

I have updated the link in my signature as exch.cx was downed unfortunately. As long as it stays like this, I will let exch.PW as an hyperlink in my signature.

I hope the situation will be solved soon for eXch  

This is the code I used if anyone needs it:

edit : fixed now

Answered with the Metamask address on Telegram, thank you!