I need to introduce a small group of people to Bitcoin in under 30 minutes. What good videos, presentations, etc. are out there currently?

https://twitter.com/LedgerHQ/status/1003944606868832256

The initial version of the Ledger Wallet desktop native application (replacing our Chrome apps) will be released on July 9th. More information on our updated blogpost https://www.ledger.fr/2018/02/23/announcing-new-ledger-wallet-desktop-mobile-applications/ … Our schedule moved by a few weeks, but the wait will be worth it!

I'm excited to finally remove the Chrome dependency. Since I don't use Chrome on my Linux-based laptop, I will be happy to finally be able to access my Ledger device from it.

Hey folks,

I've been a longstanding advocate of encryption, but I've come to realize that I don't really have an established PGP key to use for communications here. I've just created a new one (I created one ~4 years ago and have since lost it) and I'm going to publish it here and record it. I would greatly appreciate it if a few (please don't go too overboard) people would quote this post to establish it. I will also use archive.is to record this post and post it in a follow-up reply.

Here is my key:

Code:

-----BEGIN PGP PUBLIC KEY BLOCK-----
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=CmTR
-----END PGP PUBLIC KEY BLOCK-----

It is an ECC key, which I believe is currently the best (or at least better than standard) key type to use.

I've also published it to MIT's keyserver.

If any established forum members would like to attempt to verify that I am who I say I am and sign my key, I would appreciate it.

If I've missed anything here, please let me know.

I've never used a Debian-based system before and I'm a little lost. Nothing seems to recognize the device, neither the Chrome app nor Electrum.

Currently I run a program to estimate the lowest fee rate likely to get into the next block. It connects to my local Bitcoin core bode via RPC and runs getrawmempool. It sorts the transactions by fee rate, then takes off the top 1 MB worth of transactions. The fee rate of the last transaction to get in is, in my mind at least a good estimate of the required fee to get into the next block.

I am aware that this is a fairly naive approach, and I would like to improve it. Currently, it does not account for the SegWit discount and will incorrectly decide how many transactions will fit in the block. Also, I am not sure if looking at the mempool is the best option, maybe a rolling average of the lowest fee included in the past 3 blocks would be better for instance.

If these kinds of fee estimation questions have been asked before, feel free to link me but I wasn't able to find what I was looking for.

tl;dr How can I improve my simple fee estimation to be smarter?

[Removing stale orders]

This email is to communicate policy changes for placing orders on Bittrex.  As you know, Bittrex is committed to providing fair and efficient price discovery and these changes are designed to improve the overall trading experience on our markets.
 
Removing stale orders:  Effective today, Bittrex will be removing orders that are older than 28 days.  As we’ve communicated in the past, many of these orders have no reasonable expectation of being filled and clog the order books.
 
Raising the minimum trade size:  Within the next 2 weeks, the minimum allowable trade value for orders will go from 50,000 Satoshi to 100,000 Satoshi.  We will also require a minimum trade quantity on a per market basis.
 
Creating minimum tick sizes: Within the next 2 weeks, on a per market basis, we will be instituting minimum tick sizes that are based on the current price of the market.  The target is to have minimum trade sizes that are near 0.1% of the current price.  The current minimum tick size is 1 Satoshi.  For example, Ethereum trades at 0.0577 Bitcoin.  Bids and asks can only be placed in 0.0001 increments.  So the next levels allowable levels on the order book will be 0.0576 and 0.0578.
 
A general statement about market manipulation tactics:  Bittrex actively discourages any type of market manipulation, including pump groups.  Consistent with our terms of service, we will suspend and close any accounts engaging in this type of activity and notify the appropriate authorities.   
 
For more details around these policy changes, see this article.  https://support.bittrex.com/hc/en-us/articles/115003004171
 
Thank you,
 
Bill Shihara
Chief Executive Officer

Personally, I've been debating moving away from bittrex before but this is the final nail in the coffin. Their restrictive verification requirements and new $8 minimum trade size I'm not a fan of. I'll be moving to a less restrictive exchange.

I downloaded this a few weeks ago and I've tried it out today because they added SegWit support. I've found a lot of nice features, and it seems to have everything I want in a wallet. I've been looking for a replacement for Mycelium after they started taking directions I wasn't fond of and I think I'm going to switch.

Has anybody else used this wallet? I've noticed a certain slowness when opening the wallet, it often takes a long time to display the balances, sometimes I have to restart the app to get it to work, other times it loads in a few seconds.

Recently Coinhive has been pretty popular with website owners as it allows them to just include a script on their webpage and make money, mining on user's machines often without them knowing. Even more scary is people have been abusing continuous integration services like Travis CI on GitHub, which operate for free and replacing tests with coin mining code which then gets run by the free Travis CI service.

This kind of behavior is only going to hurt Bitcoin in the long run. People are going to hear about the evil websites that slow down and overheat their computer, destroying battery life on laptops. If websites want to move from ads to user mining they need to do it in a transparent way, i.e. a switch in the user's profile/settings that allows them to switch out ads for browser mining. Unfortunately for Travis CI, it may not be so easy for them to stop people from abusing their great service.

What can we do as a community to keep this kind of stuff in check?

Since there is a lack of replay protection, is there any mechanism through which we can send coins separately on the different networks?

[Purpose]

Purpose
The purpose of this thread is to look in-depth at the provable fairness systems of as many sites as possible and categorize them based on their strength and any potential flaws. This should enable players to make better decisions as to where to play, and what to watch out for. This thread only attempts to categorize sites that claim to be provably fair, sites that do not claim to be provably fair are outside the scope of this thread.

List

Site	| Thread	| Provably Fair	| Nonce	| Client Seed	| Currencies
BitDice	| Thread	| With effort/False*	| No	| 3-30 [a-z,A-Z,0-9]	| BTC, LTC, ETH, DOGE
Just-Dice	| Thread	| Yes	| Yes	| 1-24 [a-z,A-Z,0-9]	| CLAM
Primedice	| Thread	| Yes	| Yes	| 1-32 [a-z,A-Z,0-9,special]	| BTC
SafeDice	| Thread	| Yes	| Yes	| 1-15 [a-z,A-Z,0-9]	| BTC, XMR, BCH
YOLOdice	| Thread	| Yes	| Yes	| 6-128 [a-z,A-Z,0-9,-_ ]	| BTC

*: BitDice has a combination of first-party provably fair games and third-party non provably fair games.

Key

Yes	| I have personally reviewed this system and found it satisfactory
With effort	| The system is provably fair, but requires the user to jump through more hoops than usual.
False	| This site claims to be provably fair but either is not or has a large hole in their system

Explanation
Yes: Usually consists of the following: The site generates a server seed and presents the hash of the server seed to the user before betting. Additionally, the user supplies the site with a client seed before betting. This is necessary to ensure that the numbers are generated randomly. A nonce is also generally used so that the user is not required to change their client seed between every bet.

With effort: Usually consists of the above, but either there is no nonce, requiring the user to change their client seed between every bet to remain fair, or there is some other "block" making it more difficult to verify bets.

False: The site claims to be fair, but is not. Could be many things, including but not limited to:

• No client seed is used, so the site can arbitrarily choose the outcome
• Outcomes are not generated deterministically, could claim to be using random numbers from an outside source (Random.org). This is not provably fair, as these claims cannot be proved.

Notes
If you want your site added to this list, please reply below with the URL and a link to the thread in the gambling section of your site. Sites are added when I have time to review the system.

Changelog:

Code:

2017-09-20
Created Thread
Added BitDice
Added Just-Dice
Added Primedice
Added SafeDice
Added YOLOdice

[hard fork]

SegWit2x is a hard fork of the Bitcoin protocol happening on September 30th as a result of the New York Agreement. The fork changes the max block size from 1MB to 2MB. Unlike Bitcoin Cash, SegWit2x has no replay protection, meaning that transactions on one network can be broadcast on the other, sending both your Bitcoin coins and your SegWit2x coins to the same address. This makes it very hard/impossible to only send one or the other coin.

These are the facts, what follows are the opinions of me and some other members of the community.

• SegWit2x is an attack on Bitcoin, designed to move control of the software design from the developers into the hands of the miners.
• The blocksize should not be increased until all other measures to make the network more efficient have been exhausted (Lightning Network, Schnorr Signatures, MAST,
  etc.)

Here's what you can do to oppose this:

• Run a full node (At least v0.15.0) to support standard network rules.
• Contact companies that support SegWit2x still and request they change their stance.

This is just what I think. I would like to know what the rest of the community's position on this is, as a lot of my opinion is admittedly from /r/Bitcoin, which can be an echo chamber at times. I encourage everyone to have a discussion on this so that everyone can make fully informed decisions.

Edit: It appears I was grossly mistaken in how many days are remaining. I have edited the title to reflect that.

Hello, I'm here to offer a referral sharing program for anybody that's interested. Simply sign up with this referral link, and I'll give you half of what I get (0.1%) of your wagered amount back. No strings attached. If you have already signed up for an account and you create a new one but are not listed under my referrals, there's nothing I can do.

If you plan to wager large amounts, please message me here or on the site first (My user ID is 21102) so I can verify that you're listed as a referred player before you start playing.

If you have any special questions, post here and I'll answer them.

Will I be able to spend both coins, or will I have to export the wallet somewhere else?

--ERROR -ERROR - - 14887347021488734702: -: ((ERROR ..\BlockchainScanner.cpp:ERROR 271- ..\BlockchainScanner.cpp:- 2711488734702) : raw data does not match expected block hash) 14887

What can I do to fix this?

Edit: DBLog

Curious as to what the steps to take would be following development stopping

I checked the log file, it's countless repetitions of the following:

(ERROR) -- SDM.pyc:791 - ValueError in bkgd req top blk
Traceback (most recent call last):
  File "SDM.pyc", line 765, in __backgroundRequestTopBlock
  File "bitcoinrpc_jsonrpc\authproxy.pyc", line 105, in __call__
  File "json\__init__.pyc", line 351, in loads
  File "json\decoder.pyc", line 366, in decode
  File "json\decoder.pyc", line 384, in raw_decode
ValueError: No JSON object could be decoded

Please help?

Does anybody know of the best bang-for-your-buck 3D printer you can get for cheap? I was looking at the monoprice ones that are around $100, that seems like a pretty good deal.

Here is my trust page where DiscoverCebu falsely claimed that somebody had bought my account.

Here is a very old thread I made where you can see that I created my own github page. There are enough quotes and posts on that thread that you can easily tell it was not edited later.

Here is a page I created on that website to prove that I still and have always owned this account.

I am not extremely concerned about this, but I wanted to be able to have a post to point to where I have proof that this has always been my account.

Specifically, a samsung rewards prepaid card. Basically, I can use it to buy other gift cards or such in stores but I don't have a card number to put into a website. I suppose I could use it to buy another prepaid card but I don't know where I would go from there. Options?

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