BlockExplorer - 1BTCTools

[For Hire] Crypto-Currency / Blockchain Developer -- Experienced and Professional


Just finished developing out a larger wallet platform, so thought I would throw this out there. Briefly, 38 year old Canadian, 19 years high paced and professional experience within online software, with 8 of those years being bitcoin / crypto-currency. I'm the type who knows the protocol inside out, key generation and management, the cryptography to generate addresses and sign txs, BIP32, multi-sig, the message protocol to communicate directly with nodes on the P2P network, etc.
Well versed with online security, and excellent at non-custodial wallet systems where every user gets their own BIP32 wallet and funds are user segregated. Have done dozens of these operations, everything including traditional exchange, P2P exchange ala Localbitcoins, multi-vendor marketplace, merchant payment gateway, secure web wallets, coin mixers, lottery site, block explorer, jobs board, eCommerce, and the list goes on. Can do anything in your imagination.
You can view details of a base system at: https://envrin.com/secure_wallet
Demo admin panel at: https://demo.envrin.com/admin/
For a better idea of who I am and my skillset, I created Apex at: https://apexpl.io/
And if you want an idea of how in-depth I go into the protocol, I wrote an article at: https://apexpl.github.io/bitcoin_cash_sv_abc_transaction_signatures.html
Speaking of that, can now offer full support for the Bitcoin Cash / SV / ABC protocols, plus any Bitcoin deratives. Don't have ETH just yet, but that can be easily added in if your operation requires it.
If you have the desire to jump into the crypto-currency / blockchain game, and need a comprehensive, secure and scalable solution for your operation, I'm your guy. More than happy to provide you with consultation, and answer any questions you have. Rate is $50/hour, and you may contact me any time via PM here, or e-mail at [email protected].
Thanks, and looking forward to hearing from you, and getting you setup with a quality crypto-currency operation.
submitted by Envrin to forhire [link] [comments]

Fore Hire - Crypto-Currency / Blockchain Developer -- Experienced and Professional

Just finished developing out a larger wallet platform, so thought I would throw this out there. Briefly, 38 year old Canadian, 19 years high paced and professional experience within online software, with 8 of those years being bitcoin / crypto-currency. I'm the type who knows the protocol inside out, key generation and management, the cryptography to generate addresses and sign txs, BIP32, multi-sig, the message protocol to communicate directly with nodes on the P2P network, etc.
Well versed with online security, and excellent at non-custodial wallet systems where every user gets their own BIP32 wallet and funds are user segregated. Have done dozens of these operations, everything including traditional exchange, P2P exchange ala Localbitcoins, multi-vendor marketplace, merchant payment gateway, secure web wallets, coin mixers, lottery site, block explorer, jobs board, eCommerce, and the list goes on. Can do anything in your imagination.
You can view details of a base system at: https://envrin.com/secure_wallet
Demo admin panel at: https://demo.envrin.com/admin/
For a better idea of who I am and my skillset, I created Apex at: https://apexpl.io/
And if you want an idea of how in-depth I go into the protocol, I wrote an article at: https://apexpl.github.io/bitcoin_cash_sv_abc_transaction_signatures.html
Speaking of that, can now offer full support for the Bitcoin Cash / SV / ABC protocols, plus any Bitcoin deratives. Don't have ETH just yet, but that can be easily added in if your operation requires it.
If you have the desire to jump into the crypto-currency / blockchain game, and need a comprehensive, secure and scalable solution for your operation, I'm your guy. More than happy to provide you with consultation, and answer any questions you have. Rate is $50/hour, and you may contact me any time via PM here, or e-mail at [email protected].
Thanks, and looking forward to hearing from you, and getting you setup with a quality crypto-currency operation.
submitted by Envrin to Jobs4Bitcoins [link] [comments]

The BCH blockchain is 165GB! How good can we compress it? I had a closer look

Someone posted their results for compressing the blockchain in the telegram group, this is what they were able to do:
Note, bitcoin by its nature is poorly compressible, as it contains a lot of incompressible data, such as public keys, addresses, and signatures. However, there's also a lot of redundant information in there, e.g. the transaction version, and it's usually the same opcodes, locktime, sequence number etc. over and over again.
I was curious and thought, how much could we actually compress the blockchain? This is actually very relevant: As I established in my previous post about the costs of a 1GB full node, the storage and bandwidth costs seem to be one of the biggest bottlenecks, and that CPU computation costs are actually the cheapest part, as were able almost to get away with ten year old CPUs.
Let's have a quick look at the transaction format and see what we can do. I'll have a TL;DR at the end if you don't care about how I came up with those numbers.
Before we just in, don't forget that I'll be streaming today again building a SPV node, as I've already posted about here. Last time we made some big progress, I think! Check it out here https://dlive.tv/TobiOnTheRoad. It'll start at around 15:00 UTC!

Version (32 bits)

There's currently two transaction types. Unless we add new ones, we can compress it to 1 bit (0 = version 1; and 1 = version 2).

Input/output count (8 to 72 bits)

This is the number of inputs the transaction has (see section 9 of the whitepaper). If the number of inputs is below 253, it will take 1 byte, and otherwise 2 to 8 bytes. This nice chart shows that, currently, 90% of Bitcoin transactions only have 2 inputs, sometimes 3.
A byte can represent 256 different numbers. Having this as the lowest granularity for input count seems quite wasteful! Also, 0 inputs is never allowed in Bitcoin Cash. If we represent one input with 00₂, two inputs with 01₂, three inputs with 10₂ and everything else with 11₂ + current format, we get away with only 2 bits more than 90% of the time.
Outputs are slightly higher, 3 or less 90% of the time, but the same encoding works fine.

Input (>320 bits)

There can be multiple of those. It has the following format:

Output (≥72 bits)

There can be multiple of those. They have the following format:

Lock time (32 bits)

This is FF FF FF FF most of the time and only occasionally transactions will be time-locked, and only change the meaning if a sequence number for an input is not FF FF FF FF. We can do the same trick as with the sequence number, such that most of the time, this will be just 1 bit.

Total

So, in summary, we have:
Nice table:
No. of inputs No. of outputs Uncompressed size Compressed size Ratio
1 1 191 bytes (1528 bits) 128 bytes (1023 bits) 67.0%
1 2 226 bytes (1808 bits) 151 bytes (1202 bits) 66.5%
2 1 339 bytes (2712 bits) 233 bytes (1861 bits) 68.6%
2 2 374 bytes (2992 bits) 255 bytes (2040 bits) 68.2%
2 3 408 bytes (3264 bits) 278 bytes (2219 bits) 68.0%
3 2 520 bytes (4160 bits) 360 bytes (2878 bits) 69.2%
3 3 553 bytes (4424 bits) 383 bytes (3057 bits) 69.1%
Interestingly, if we take a compression of 69%, if we were to compress the 165 GB blockchain, we'd get 113.8GB. Which is (almost) exactly the amount which 7zip was able to give us given ultra compression!
I think there's not a lot we can do to compress the transaction further, even if we only transmit public keys, signatures and addresses, we'd at minimum have 930 bits, which would still only be at 61% compression ratio (and missing outpoint and value). 7zip is probably also able to utilize re-using of addresses/public keys if someone sends to/from the same address multiple times, which we haven't explored here; but it's generally discouraged to send to the same address multiple times anyway so I didn't explore that. We'd still have signatures clocking in at 512 bits.
Note that the compression scheme I outlined here operates on a per transaction or per block basis (if we compress transacted satoshis per block), unlike 7zip, which compresses per blockchain.
I hope this was an interesting read. I expected the compression ratio to be higher, but still, if it takes 3 weeks to sync uncompressed, it'll take just 2 weeks compressed. Which can mean a lot for a business, actually.

I'll be streaming again today!

As I've already posted about here, I will stream about building an SPV node in Python again. It'll start at 15:00 UTC. Last time we made some big progress, I think! We were able to connect to my Bitcoin ABC node and send/receive our first version message. I'll do a nice recap of what we've done in that time, as there haven't been many present last time. And then we'll receive our first headers and then transactions! Check it out here: https://dlive.tv/TobiOnTheRoad.
submitted by eyeofpython to btc [link] [comments]

Weekly Update: Mycro on ParJar, PAR on MetaMorphPro, new customer for Resolvr, 1UP on IDEX... – 19 Jul - 25 Jul'19

Weekly Update: Mycro on ParJar, PAR on MetaMorphPro, new customer for Resolvr, 1UP on IDEX... – 19 Jul - 25 Jul'19
Heya everyone, looks like we are in for another round of rapid catch ups on the weekly updates. Haha. Here's another exciting week at Parachute + partners (19 Jul - 25 Jul'19):

In honour of our latest partnership with Silent Notary, this week we had an SNTR Parena. Richi won the finale to take home a cool share from the 1.5M SNTR pot. The weekly Parena had a 100k PAR pot. McPrine took home the lion’s share by beating Ken in a closely fought finale. In 8 months since ParJar started, we are now at 12k users, 190k transactions and 200+ communities. Cap says: “…to put it into perspective - June 18th we were around 100k transactions and 9 k users. A month later we’ve added 3k new users (33% growth) and 80,000 new transactions”. Freaking amazing! And thank you for the shoutout aXpire! MYO (Mycro) was added to ParJar this week. And their community started experiencing the joys of tipping.
Lolarious work by @k16v5q5!
Last week MetaMorphPro did a Twitter vote to list new projects. Turns out Parachuters did PAR a solid. Woot woot! The first ever official TTR shirt is already live in the Parachute shop. Alexis announced the start of a shirt design contest to add to the TTR shirt inventory. Ian’s art quiz in TTR this week saw 25k PAR being given away to winners. Victor’s quiz had another 25k PAR pot for the winners. And Unique’s Math quiz in TTR was a 50k PAR extravaganza. All in all, 100k PAR won in quizzes in TTR this week. Sweet! Cryptonoob (Tom) set up a survey this week for “..for people who are interested in Crypto but don't know where to start..” for his work on the Parachute app UX. We all know how much Gian loves the reality show Big Brother. So we saw a new take on his Tuesday fun events. Mention your favourite reality show and what it’s all about to get some cool PAR. Yay!
A PAR coaster makes its way from design to final product in @k16v5q5’s workshop
Chris’ Golf tourney contest resulted in no winners since there were no correct guesses. So he decided to give out fun prizes instead: like Jason for coming last, Win for a “hilariously bad guess” of 100 strokes for the champions total score etc. Haha. However, there were a few top prize winners as well. LordHades, with a tournament score of 1968, took home 50k PAR as grand prize. Neat! Ali, Hang, Clinton and Tony came in close at 2nd to 5th positions. Congrats! And with that, Chris announced the start of another contest: Premier League Challenge for Parachuters (Entry code: x0zj2d) with an entry fee of 5000 PAR each. Prize pool yet to be announced. Jason is still in the lead this week in the Big Chili Race at 47 cm. Not much change either in the other plants. Slow week at Chili land.
Ric getting in on that sweet Parachute merch
Last week we shared that AXPR got listed on Binance Dex. The ERC20-BEP2 conversion bridge went live this week. Learn how to convert your ERC20 tokens to the BEP2 variant from the available how-to guides (article/video/gif). To mark the occasion, aXpire gave away a ton of BNB in an easter egg contest plus a 1% AXPR deposit bonus to folks who started using the bridge. Remember, we had mentioned that the reason for the weekly double burn of AXPR will be revealed this week? Well here it is. Resolvr onboarded a new client: HealthGates. More fees, more burn. Read more about it here. Woot! Victor hosted a trivia like every week on Friday at aXpire for 1000 AXPR. 10 questions. 100 AXPR each. Nice! Catch up on the week that was at aXpire from their latest video update. 2gether was selected as one of the top 100 most innovative projects by South Summit this week. Cryzen now built a Discord-Telegram chat bridge so that anything posted in either platform gets cross posted on the other. The latest WandX update covers the dev work that’s been going on for the past few weeks – support for Tezos wallet, staking live for Tezos, Livepeer and Loom etc.
2gether on South Summit’s honour roll
BOMB community member rouse wrote a quick script on how to identify and avoid common crypto scams. Have a read. As BOMB says, “Stay vigilant and always verify”. Last week's giveaway for the top lessons shared by entrepreneurs had so many good entries that the final list was expanded to 19 winners. Awesome stuff! Zach’s latest article on the difference between BOMB and BOMBX explores both the basic and the more complex distinctions. Switcheo’s introductory piece on hyperdeflationary tokens also talks at length about the BOMB project. Zach also announced the start of the Telegram Takeover Challenge this week – get new communities to experience ParJar and BOMB and earn some cool BOMB tokens in return. Win win! In preparation for the integration of the SMS feature in the Birdchain app, the team released an article on some key statistics. Here’s a video from Birdchain CEO Joao Martins discussing the feature. The latest Bounty0x distribution report can be found here. Also, check out a shoutout to the platform in this NodesOfValue article on bounty hunting opportunities.
Start of beta testing for SMS feature in Birdchain
The ETHOS Universal Wallet now supports Bitcoin Cash and Typerium. Following ETHOS’ listing on Voyager, it will also become the native token on Voyager. Switch continued its PR campaign with cover pieces on Yahoo, CCN and DDFX this week. Altcoin Buzz has a section on its site named “Community Speaks” where members of a crypto community share updates on a project they support. This week, Fantom was featured in this section. V-ID is the latest project using Fantom’s ERC20-BEP2 bridge for listing on Binance Dex. Big props to FTM for opening it up to other projects. FTM got listed on Probit and Airswap. FTM can also now be used as collateral for borrowing on the Constant platform. The Fantom Foundation joined the Australian Digital Commerce Association which works on regulatory advocacy in blockchain. This was also a perfect setting for the Fantom Innovation Labs team to attend the APAC Blockchain Conference in Sydney. Here’s a report. In this week’s techno-literature, have a read of the various Fantom mainnets and the TxFlow protocol by clicking here and here respectively.
Another proposed token utility of ETHOS
Uptrennd’s 1UP token was listed on IDEX this week. To put it simply, the growth at Uptrennd Twitter has been explosive. Check out these numbers. Awesome stats! This free speech vs fair pay chart shared by Jeff explains why the community backs the platform. About 96% of 1UP issued this week has been used to level up on Uptrennd. Want a recap of the latest at Uptrennd? Click here. Crypto influencer Didi Taihuttu and his family (The Bitcoin Family) joined the platform this week. Congrats once again to Horizon State for making it to the finals of The Wellington Gold Awards. Some great networking opportunities and exposure right there. If you have been lagging behind on HST news, the latest community update covers the past month. We had also mentioned last week that Horizon State is conducting a vote for The Opportunities Party in New Zealand. Here’s a media report on it. Catch up on the latest at District0xverse from their Weekly and Dev updates. The Meme Factory bot was introduced this week to track new memes and marketplace trends on Meme Factory. The HYDRO article contest started last week was extended to the 27th. 50k HYDRO in prizes to be won. Noice! Hydrogen got nominated as a Finalist to the 2019 FinXTech Awards. HYDRO was also listed on the HubrisOne wallet this week. And finally, here’s a closer look at the Hydro Labs team. The folks who make the magic happen. Sup guys!
The Parachute Big Chili Race Update – Jason at 1st, Sebastian at 3rd
And with that, we close for this week at Parachute and partners. See you again with another weekly update soon.
submitted by abhijoysarkar to ParachuteToken [link] [comments]

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Bitcoin Token Full Review

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