再論雲礦 HashFlare 的 SHA-256 合約的最小購買金額該是多少?


在之前 2017-12-09 發布的這篇「雲礦 HashFlare 的 SHA-256 合約該怎麼買? 最小購買金額該是多少?」中,我們提到,因為有最低提領金額的限制,所以不應該只買最小算力刻度 10 GH/s,不然最後會無法提領出來,並且推算出若想每月都提領一次,依當時的最低提領金額規則,0.0115 BTC,建議一次購買 3 TH/s 以上。

後來在 2017-12-22 時,HashFlare 五倍的調高了這個最低提領金額來到了 0.0506 BTC,讓網路上罵聲四起,一直罵到現在都還在罵,多數認為 HashFlare 這個行為明顯的是要資金不足了,大家都不用出金了,是詐騙 (Scam) 的前兆。但其實你若仔細看它公告,它聲明這只是實驗性的、臨時性的提高,並不是常態,而且更多人不知道的是,它在做這個調高的同時,另外有輔以配套措施,只是 HashFlare 這家公司很怪,它明明可以高調說明,在臉書及推特上道出聲明,消除網路上的疑慮,但它只是選擇默默的在它的 FAQ 中的一個小角落解釋。

我們來看它在這篇「Why Bitcoin Withdrawals and Payments Are Taking so Long to Confirm?」中的最末段「What if my final balance is lower than the current minimum withdrawal amount?」:

Remember, that we change the minimum withdrawal amount and transaction fee reactively based on external factors. Should the situation on the network improve, we will lower the minimum withdrawal amount.
Currently, we are looking for a solution for those, whose total balance is smaller than the minimum withdrawal at the end of their contracts. At the moment, we can confirm that users will still be able to make a withdrawal in case if their balance will be lower than the minimum withdrawal amount by the time when their contract expires.


所以,其實,它已經承諾了,合約期滿時,若你的帳戶餘額真的沒有達到最低提領標準,他還是會讓你提領的。護貝一下,不然以後又變了。



好了啦,大家不要再罵了,人家 HashFlare 還是有考慮到細節的。

用虛擬主機 (VPS) 挖礦初步結果報告


延續「東港計畫」這個實驗,初步結果出爐了。

先前情提要一下,原先我們計畫花費 2.79 歐元租用這家 ArubaCloud 的 Cloud VPS – VPS Hosting ,企圖在十天內挖到與 1/3 月租金等值的門羅幣,也就是 0.006555 個門羅幣 (以承租當時的 XMR 均價換算)。在從 2017-12-14 到 2017-12-25 這整整十天的執行成果如下圖所示。



所以在這十天中總共挖出了 0.002654922437 - 0.001850557307 = 0.00080436513 個門羅幣。與原先預期的 0.006555 個門羅幣,達成率只有到 12.27%,真是糟到一個不行。

結論就是,用虛擬主機 (VPS) 挖礦,不行。至少,用這家ArubaCloud 不行。現下,我要去悼念我逝去的 2.79 歐元了,等過一陣子心情好一些,再換用 Hetzner 的 CX20 方案試試看囉。

Crypterra? 不了, 謝謝!



Crypterra 最近算是突然竄起了,Ray 我在各大社群開始看到有人在推廣,也不時有同好私訊邀請要一起發大財,尤其是最近這一波的促銷方案,在 2018-01-10 結束之前,使用促銷碼 XMAS30BTC 購買 20 TH/s 的 Enterprise BTC 方案,只要 1,792 美金!換算起來,是每 TH/s 算力只要 89.6 美金的兩年期合約,相較於 HashFlare 的每 TH/s 算力 220 美金一年期合約,真是一整個會讓人失去理智。

但是在花了一點時間瀏覽了一下他的官網,尤其是在看了他的公司簡介之後,我原先的熱情就冷掉了一大半,主要是他公司簡介的內容以太沒有溫度了,而且什麼細節都沒有揭露,真是糟糕,我只好去他的推特以及部落格看看,發現除了轉貼一些比特幣的消息之外,完全沒有關於它們這個服務營運後產生的相關議題,比如說,官網何時掛了阿,付款何時延遲了阿,通通都沒有,一點都不像是真的有在營運的公司,都沒有一些公告什麼的,有的只看到在促銷而已。

講到真的假的,我又把他的公司地址 (18/19 College Green,. Dublin 2. D02 VH77. Ireland.) 拿去用 Google 查,發現很多其他公司都登記在相同的這個地址上,而且其中有一家 Dublin Office Centre 看來是在提供 Virtual Office Services 的服務,所以從我的角度看這家 Crypterra 實在是很像一家紙上公司


因為光從外面看根本是資訊接露不足,我接著嘗試註冊一個帳號進去看看有沒有更多的線索。不看還好,我想,這就是最後那一根稻草了,它是不收每日維運費的,在相對於其他同業,這麼便宜的價格下,竟然還沒有維運費,完全不科學阿。如果依照我在「如何挑選雲端挖礦公司?」一文中的判斷標準,這家 Crypterra 是完全不及格的了。而且,再偷偷跟你講哦,還有好多其它疑點哦,比如說,它沒有提供 2FA 二次驗證哦,這現在不都是最基本的嗎?又比如說,它只能用比特幣及萊特幣付款,沒有信用卡付款的選項,是不是信用卡公司那關過不了呢?

所以,Crypterra? 不了,謝謝!至少目前為止,我不會貿然投入,或許再過一陣子,有更多的佐證資料出現之後,再重新來評估這家。不過,到時候可能每 TH/s 算力只要 89.6 美金這種超值優惠就不會再有了,這沒辦法,人生就是這樣,單純的就是要做出取捨,是吧。當然,如果你的風險承受能力很高,那你真的可以試試看,真的很便宜阿~

以下提供它的兩年期 BTC 合約給各位參考。

BTC Mining Capacity Share Contract

09:07:49 PM, December, 31 2017

I  , , , , , , (the "Customer") agree with the following terms and conditions for the provision of mining services (the "Agreement") made as of today

between:

Crypterra Inc., 18-19 College Green, Dublin, Ireland ("Service Provider");
and me, the Customer.

Pursuant to the terms of this Agreement, the Service Provider will make available to the Customer shares in the mining capacity of the Service Provider.

1. Services

1.1 The Service Provider agrees to provide to the Customer with the output of its mining capacity (the "Services") subject to the following terms:
Crypto Currency: Bitcoin
Term: 2 years
Mining Power: 20000 GH/s
Payout frequency: daily
Mining Output ("Coins"): as agreed between Service Provider and Costumer, and, where applicable converted from time to time, e.g., Bitcoin, Bitcoin or other electronic currencies

1.2 The Customer will be solely liable for the maintenance of the relevant technical equipment (software/hardware) that is required to receive the above service. The Customer will receive Coins mined in accordance with the above Mining Power and of applicable Fees as per 2.1. The Customer also acknowledges that the above Services will be rendered on a best effort basis.

1.3. The availability of the Mining Power and, accordingly, the output of Coins may vary up to a maximum of 10%. Otherwise, the Service Provider ensures that it maintains all facilities and the relevant supplies in good working order, in order to avoid any of the above volatility with the diligence that it applies in its own dealings.

2. Remuneration

2.1 As a consideration for the Services the Customer agrees to pay to the Service Provider an amount of (the "Fee"): 

0.00 USD

deducted on a daily basis* from the generated Coins.

3. Limitation of Liability


3.1 Without detriment to the Service Providers obligation to render the Services on a best effort basis, only, any liability of the Service Provider hereunder and or in connection with this Agreement shall be limited to willful misconduct and gross negligence. Further, the Service Provider shall not be liable for any damages incurred by the Customer as a result of force majeur which shall include any disruption or breakdown of a Coin market.

4. Term


4.1 This Agreement is entered into for the term indicated above.

4.2 The Service Provider may terminate this Agreement with immediate effect if the Coins generated in the preceding 60 days do not suffice to pay the Fee under 2.1 above.

4.3 Otherwise, this Agreement may only be terminated by either party for good cause.

4.4 In the event of a termination for good cause by the Customer, and, for the avoidance of doubt in any such event, the Customer shall be entitled to a repayment of item 2.1 above in the proportion of the time lapsed since the beginning of the Term divided by the Term.

4.5 In case the Service Provider voluntarily agrees to refund the Customer, a processing fee of USD 10 will be deducted.

5. Communication


5.1 All communication between the Service Provider and the Customer shall be made in writing which includes e-mail and other electronic messaging services (Textform).

6. Data Protection


6.1 The Customer agrees to the processing of its personal data provided in the context of this Agreement for the purpose described herein and also agrees, until revocation at any time to the storage of its data beyond the above Term. Should the Service Provider be required to obtain any further data in the context of providing its services hereunder, the Customer will without undue delay provide the relevant data so required by the Service Provider.

7. Representations and Warranties


7.1 The Customer represents and warrants to the Service Provider that he is familiar with mining, crypto currencies and Bitcoin in particular and that he understands the nature and uses of mining crypto currencies and Bitcoin.

7.2 The Customer further represents and warrants that he will be the beneficial owner of the Coins.

8. Credit Card Services through Credit Card Service Provider


8.1 The following provisions under this section 8 only apply to the extent the Services are paid by credit card.

8.2 The customer acknowledges and agrees that if, for any reason, Crypterra Inc. is not able to continue supplying the purchased services during the period of the customer’s plan, Crypterra Inc.’s maximum liability, if any, will be for what the customer paid, at the time of the payment for the services, minus all the dividends and/or bitcoins and/or payments that Crypterra Inc. provided to the customer up till the date that the service stopped.

8.3 The Service Provider uses third party services and such third party’s affiliates services which enable the Customer to place monetary deposits and perform transfer of payments within the website of the Service Provider by making use of the Customers existing credit card (as and if available and applicable) (the “Credit Card Services” and the “Credit Card Service Provider”). The Credit Card Services do not include any additional service, and such Credit Card Services do not Customers account.

8.4 The Service Provider may share and transfer (including cross border transfer) personal information with the Credit Card Service Provider for the purpose of rendering the Credit Card Services which will be made to Service Providers website via the use of the Customers credit card. The personal information will be shared with the Credit Card Service Provider after the Customer elects to execute such monetary payments by using the Credit Card Services of the Credit Card Service Provider. For the purpose of this section 8 personal information shall include information that identifies or may identify the Customer including the information submitted by the Customer through the registration form when you subscribe to the website such as the Customers E-mail address, country and city and/or information provided through social websites or any other identifying information provided by the Customer while using the Services of the Service Providers website.

8.5 In addition, the Service Provider may transfer any non-personal information provided by the Customer through the Customers use of the Services on the Service Providers website to the Credit Card Service Provider in order to allow the Credit Card Service Provider to perform preliminary examinations of non-personal information for the purpose of determining if the Customer is qualified to use the Credit Card Services of such Credit Card Service Provider (including the history of the Customers transactions on the website which will be provided without any identifying information and solely for the purpose examinations of the Credit Card Service Provider).

8.6 By accepting these terms, the Customer represents that any and all information the Customer provides to the Service Provider is true and accurate. Any false or fraudulent information and/or use of the Services and/or Credit Card Services rendered to the Customer, is prohibited. The Customer is not obligated by law to provide the Service Provider and/or the Credit Card Service Provider with any personal information. The Customer hereby acknowledges and agrees that he is providing the Service Provider and/or the Credit Card Service Provider with personal information at his/her own free will, for the purposes of rendering the Services and/or Credit Card Services.

8.7 By using the Credit Card Services the Customer hereby agrees and accepts that he will not be allowed and shall be prohibited from withdrawing any amounts that the Customer has deposited and/or is entitled to as a result of the Services rendered by the Service Provider for a period of 30 days. In case the payment by the Customer results in a charge-back or other material issues occur, the Service Provider is entitled to keep all existing, current and future Mining Output.

9. Governing Law, Language and Miscellaneous


9.1 This Agreement is governed by Ireland's law. To the extent permitted by applicable law the parties agree that the competent courts of London shall have non-exclusive jurisdiction to hear and determine any suit, action or proceeding, and to settle any disputes, which may arise out of or in connection with this Agreement

9.2 This Agreement is made in the English language and this English language version of this Agreement shall be binding on the parties hereto and shall prevail over any translation of this Agreement provided that in the case of any German translation of a word or phrase in the text of this Agreement, such German translation of such word or phrase shall prevail

*if, on any day, Coins generated on one day do not suffice to pay item 2 of the Fee above, the Service Provider may use Coins generated on any day thereafter for such payment.