Download - Bitcoin

Microcash - General Discussion

Microcash is a new form of cryptographic currency, currently under development. Bitcoin has been a genius proof-of-concept and proof-of-adoption digital commodity. The Microcash project hopes to vastly improve upon the distributed cryptographic currency idea with numerous innovations that current crypto-currencies cannot implement due to the nature of the bitcoin protocol.
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Keep on minting my friends

http://www.mintcoinofficial.eu/ Mintcoin is a community owned and operated pure proof-of-stake crypto-coin. Save your coins in your wallet and earn the annual percentage rate while securing the Mintcoin network. Fast. Secure. Energy Efficient. Digital Internet Money. Mintcoins literally mint coins. Join us, we'll teach you how to mint coins. Start the process of minting your own coins today!
[link]

GlobalBoost- A CryptoCurrency To Help Wounded Veterans

BSTY brings a completely new algorithm to the digital currency scene, and combines it with our real products, real company, and visible & accountable leadership. We aim to improve the acceptance of digital money, providing a safe & attractive investment using Yescrypt as our POW.
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Recently learned about Bitcoins raw transactions and signing offline features through RPC commands, are all cryptocurrencies able to do this through their core client?

I know some coins have GUI ways of signing offline transactions like LTC and BTC having Electrum with user friendly features. As well as Ether and some others having HTML/web wallets that can be run offline.
But those tools are not available to all coins as far as I know. Having just learned that it can be done through the core client which I thought is something all coins have, I wanted to make sure if this option of keeping private keys in cold storage but still being able to send coins without making new addresses by signing offline would be available to all coins if done through RPC commands.
submitted by Epistechne to CryptoCurrency [link] [comments]

09-30 18:33 - 'Recently learned about Bitcoins raw transactions and signing offline features through RPC commands, are all cryptocurrencies able to do this through their core client?' (self.Bitcoin) by /u/Epistechne removed from /r/Bitcoin within 22-32min

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Recently learned about Bitcoins raw transactions and signing offline features through RPC commands, are all cryptocurrencies able to do this through their core client?
Go1dfish undelete link
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Author: Epistechne
submitted by removalbot to removalbot [link] [comments]

Recently learned about Bitcoins raw transactions and signing offline features through RPC commands, are all cryptocurrencies able to do this through their core client? /r/Bitcoin

Recently learned about Bitcoins raw transactions and signing offline features through RPC commands, are all cryptocurrencies able to do this through their core client? /Bitcoin submitted by ABitcoinAllBot to BitcoinAll [link] [comments]

Recently learned about Bitcoins raw transactions and signing offline features through RPC commands, are all cryptocurrencies able to do this through their core client? /r/Bitcoin

Recently learned about Bitcoins raw transactions and signing offline features through RPC commands, are all cryptocurrencies able to do this through their core client? /Bitcoin submitted by cryptoallbot to cryptoall [link] [comments]

C# Bitcoin Library / RPC Wrapper for .Net projects, up-to-date, Testnet ready, console/web demo clients and setup instructions included.

C# Bitcoin Library / RPC Wrapper for .Net projects, up-to-date, Testnet ready, console/web demo clients and setup instructions included. submitted by mcaizgk2 to Bitcoin [link] [comments]

iguana is bitcoin core, client, RPC server and more

iguana is bitcoin core, client, RPC server and more submitted by grewalsatinder to Bitcoin [link] [comments]

Is there a way to run a full bitcoin JSON-RPC client without running a full node (downloading the full blockchain)?

Hi really dumb question here folks.
I'm trying to figure out how to get a project to work which requires that I have a "JSON-RPC client" up and running. I know I can download the full blockchain then start bitcoind server to get this going. Can I just have a bitcoin.conf point at some server to have the same functionality? Thanks!
submitted by arbitrage_ to BitcoinBeginners [link] [comments]

I was frustrated at how hard it is to setup for dev around (not on) Bitcoin Core so put this together. It includes Bitcoin Core via PPA and Rein's client and server under virtualenv. A highlight is Bitcoin Core being configured use testnet, 2gb pruned, serving RPC with a randomly generated password.

I was frustrated at how hard it is to setup for dev around (not on) Bitcoin Core so put this together. It includes Bitcoin Core via PPA and Rein's client and server under virtualenv. A highlight is Bitcoin Core being configured use testnet, 2gb pruned, serving RPC with a randomly generated password. submitted by dsterry to Bitcoin [link] [comments]

Haskell client for Bitcoin Core/RPC /r/Bitcoin

Haskell client for Bitcoin Core/RPC /Bitcoin submitted by BitcoinAllBot to BitcoinAll [link] [comments]

iguana is bitcoin core, client, RPC server and more

iguana is bitcoin core, client, RPC server and more submitted by BitcoinAllBot to BitcoinAll [link] [comments]

Sending RPC commands to Bitcoin Client

I'm trying like hell to learn java, and with some success. However, I want to learn how to connect to my bitcoin rpc server and send commands, such as getinfo or sendfrom.
I understand that functions are called methods in java, so I'd like a method to actually initiate the connection and verify that it works by sending a getinfo command, then when it returns something that isn't null, have the ability to send other commands.
I know there are java classes and stuff that people have already written, but I want to write it for myself and understand better how it works and what is required.
I have experience with several different programming languages and part of my job is to write custom modules for our ERP system, which uses some stupid mashup of cobol and VB. So, any help would be greatly appreciated!!! Thanks!
submitted by bmp02050 to learnjava [link] [comments]

Importing private key using RPC client /r/Bitcoin

Importing private key using RPC client /Bitcoin submitted by BitcoinAllBot to BitcoinAll [link] [comments]

Developers: Super-simple jQuery code for making JSON-RPC calls to Bitcoin Client

In working on some proof-of-concept stuff, I ran in to a bunch of issues communicating with the Bitcoin Client server. Though there are a number of existing libraries for both JSON-RPC in general, and communicating with the Bitcoin Client, they're all a bit heavier than I wanted. So, I dug through the source code and came up with the smallest, easiest way to connect to the server using nothing but some Javascript and jQuery:
$.ajax({ url: 'http://RPC_USERNAME:[email protected]:RPC_PORT', dataType: 'json', type: 'POST', contentType: 'application/json', data: '{"method": "API_METHOD"}', // For parameters: //data: '{"method": "API_METHOD", "params": ["PARAMETERS"]}', timeout: 15000, success: function(data) { // Response lives in data.result (data.result.version, etc) }, error: function(oops) { // oops.statusText returns error } }); 
Running this code will access a wallet on the same machine. I haven't done much testing of different calls or error handling, but this should be enough to get you started. Replace RPC_USERNAME, RPC_PASSWORD, and RPC_PORT (usually 8332) with the data set in your bitcoin.conf file, and reference the API calls list to see what you can do. With a properly-configured server, I imagine you could change 127.0.0.1 to a URL or IP and access a web-based client.
This code is 100% open and free for anyone to do whatever they want with it, obviously. No credit necessary. Consider it under a WTFPL License. I will kindly take Bitcoin donations, of course: 1KSEKy3XTRxJd7CqKciSsnx752VRaibBWr. Enjoy!
submitted by 54mf to Bitcoin [link] [comments]

Are there any Bitcoin clients that can RPC connect to a Bitcoind server?

I'm running the original Bitcoin wallet on my server, and I wanted a graphical client that I can run on my desktop that can rpc connect to my server, but I can't seem to find any.
The Bitcoin-qt doesn't support rpcconnect (https://github.com/bitcoin/bitcoin/pull/2513 which is very strange! it should support it :().
Does anyone know of any client that does support it?
submitted by intahnetmonster to BitcoinBeginners [link] [comments]

BCHN Now 40% Faster at Mining than ABC

BCHN Now 40% Faster at Mining than ABC submitted by blockparty_sh to btc [link] [comments]

Algorithm for starting to accept payments in BTC?

I'm a developer and run a full node of Bitcoin.
I have several shops where I plan to start accepting bitcoin payments. The volume I invision in the beginning would be rather small.
(1) What'd be a simple algorithm for how to get started with it?
Would I have to generate (N of shops * 100) addresses first? And then map each of 100 to a shop? And then at checkout give a user one of those addresses and then watch when the 1st confirmation arrives, by doing poll requests from my shop to my full node server, remotely, via RPC?

(2) Also, how would I actually properly create a wallet for this? I'll need that wallet to be watch-only.
(3) Would I be able to somehow connect my Electrum client-wallet to that bitcoin watch-only wallet so that I could see how much of bitcoins there're in it, from my laptop in a more convenient manner?

---
I don't consider third-party solutions such as BTC server or Electrum server. I use Electrum as a wallet only, on desktop.
submitted by artjuna_0900 to btc [link] [comments]

Gridcoin 5.0.0.0-Mandatory "Fern" Release

https://github.com/gridcoin-community/Gridcoin-Research/releases/tag/5.0.0.0
Finally! After over ten months of development and testing, "Fern" has arrived! This is a whopper. 240 pull requests merged. Essentially a complete rewrite that was started with the scraper (the "neural net" rewrite) in "Denise" has now been completed. Practically the ENTIRE Gridcoin specific codebase resting on top of the vanilla Bitcoin/Peercoin/Blackcoin vanilla PoS code has been rewritten. This removes the team requirement at last (see below), although there are many other important improvements besides that.
Fern was a monumental undertaking. We had to encode all of the old rules active for the v10 block protocol in new code and ensure that the new code was 100% compatible. This had to be done in such a way as to clear out all of the old spaghetti and ring-fence it with tightly controlled class implementations. We then wrote an entirely new, simplified ruleset for research rewards and reengineered contracts (which includes beacon management, polls, and voting) using properly classed code. The fundamentals of Gridcoin with this release are now on a very sound and maintainable footing, and the developers believe the codebase as updated here will serve as the fundamental basis for Gridcoin's future roadmap.
We have been testing this for MONTHS on testnet in various stages. The v10 (legacy) compatibility code has been running on testnet continuously as it was developed to ensure compatibility with existing nodes. During the last few months, we have done two private testnet forks and then the full public testnet testing for v11 code (the new protocol which is what Fern implements). The developers have also been running non-staking "sentinel" nodes on mainnet with this code to verify that the consensus rules are problem-free for the legacy compatibility code on the broader mainnet. We believe this amount of testing is going to result in a smooth rollout.
Given the amount of changes in Fern, I am presenting TWO changelogs below. One is high level, which summarizes the most significant changes in the protocol. The second changelog is the detailed one in the usual format, and gives you an inkling of the size of this release.

Highlights

Protocol

Note that the protocol changes will not become active until we cross the hard-fork transition height to v11, which has been set at 2053000. Given current average block spacing, this should happen around October 4, about one month from now.
Note that to get all of the beacons in the network on the new protocol, we are requiring ALL beacons to be validated. A two week (14 day) grace period is provided by the code, starting at the time of the transition height, for people currently holding a beacon to validate the beacon and prevent it from expiring. That means that EVERY CRUNCHER must advertise and validate their beacon AFTER the v11 transition (around Oct 4th) and BEFORE October 18th (or more precisely, 14 days from the actual date of the v11 transition). If you do not advertise and validate your beacon by this time, your beacon will expire and you will stop earning research rewards until you advertise and validate a new beacon. This process has been made much easier by a brand new beacon "wizard" that helps manage beacon advertisements and renewals. Once a beacon has been validated and is a v11 protocol beacon, the normal 180 day expiration rules apply. Note, however, that the 180 day expiration on research rewards has been removed with the Fern update. This means that while your beacon might expire after 180 days, your earned research rewards will be retained and can be claimed by advertising a beacon with the same CPID and going through the validation process again. In other words, you do not lose any earned research rewards if you do not stake a block within 180 days and keep your beacon up-to-date.
The transition height is also when the team requirement will be relaxed for the network.

GUI

Besides the beacon wizard, there are a number of improvements to the GUI, including new UI transaction types (and icons) for staking the superblock, sidestake sends, beacon advertisement, voting, poll creation, and transactions with a message. The main screen has been revamped with a better summary section, and better status icons. Several changes under the hood have improved GUI performance. And finally, the diagnostics have been revamped.

Blockchain

The wallet sync speed has been DRASTICALLY improved. A decent machine with a good network connection should be able to sync the entire mainnet blockchain in less than 4 hours. A fast machine with a really fast network connection and a good SSD can do it in about 2.5 hours. One of our goals was to reduce or eliminate the reliance on snapshots for mainnet, and I think we have accomplished that goal with the new sync speed. We have also streamlined the in-memory structures for the blockchain which shaves some memory use.
There are so many goodies here it is hard to summarize them all.
I would like to thank all of the contributors to this release, but especially thank @cyrossignol, whose incredible contributions formed the backbone of this release. I would also like to pay special thanks to @barton2526, @caraka, and @Quezacoatl1, who tirelessly helped during the testing and polishing phase on testnet with testing and repeated builds for all architectures.
The developers are proud to present this release to the community and we believe this represents the starting point for a true renaissance for Gridcoin!

Summary Changelog

Accrual

Changed

Most significantly, nodes calculate research rewards directly from the magnitudes in EACH superblock between stakes instead of using a two- or three- point average based on a CPID's current magnitude and the magnitude for the CPID when it last staked. For those long-timers in the community, this has been referred to as "Superblock Windows," and was first done in proof-of-concept form by @denravonska.

Removed

Beacons

Added

Changed

Removed

Unaltered

As a reminder:

Superblocks

Added

Changed

Removed

Voting

Added

Changed

Removed

Detailed Changelog

[5.0.0.0] 2020-09-03, mandatory, "Fern"

Added

Changed

Removed

Fixed

submitted by jamescowens to gridcoin [link] [comments]

Is there a python (or other) library to send raw bitcoin protocol commands to a peer?

From the protocol docs, there are some interesting low level commands that aren't really surfaced in the client RPC API. Is there a python, ruby or nodejs library that will allow you to connect to peers and send protocol commands?
Something like:
python bitcoin_wizbang.py start python bitcoin_wizbang.py connect 88.99.167.175:18333 python bitcoin_wizbang.py send_command getheaders python bitcoin_wizbang.py stop
Thoughts?
submitted by brianddk to Bitcoin [link] [comments]

Syscoin Platform’s Great Reddit Scaling Bake-off Proposal

Syscoin Platform’s Great Reddit Scaling Bake-off Proposal

https://preview.redd.it/rqt2dldyg8e51.jpg?width=1044&format=pjpg&auto=webp&s=777ae9d4fbbb54c3540682b72700fc4ba3de0a44
We are excited to participate and present Syscoin Platform's ideal characteristics and capabilities towards a well-rounded Reddit Community Points solution!
Our scaling solution for Reddit Community Points involves 2-way peg interoperability with Ethereum. This will provide a scalable token layer built specifically for speed and high volumes of simple value transfers at a very low cost, while providing sovereign ownership and onchain finality.
Token transfers scale by taking advantage of a globally sorting mempool that provides for probabilistically secure assumptions of “as good as settled”. The opportunity here for token receivers is to have an app-layer interactivity on the speed/security tradeoff (99.9999% assurance within 10 seconds). We call this Z-DAG, and it achieves high-throughput across a mesh network topology presently composed of about 2,000 geographically dispersed full-nodes. Similar to Bitcoin, however, these nodes are incentivized to run full-nodes for the benefit of network security, through a bonded validator scheme. These nodes do not participate in the consensus of transactions or block validation any differently than other nodes and therefore do not degrade the security model of Bitcoin’s validate first then trust, across every node. Each token transfer settles on-chain. The protocol follows Bitcoin core policies so it has adequate code coverage and protocol hardening to be qualified as production quality software. It shares a significant portion of Bitcoin’s own hashpower through merged-mining.
This platform as a whole can serve token microtransactions, larger settlements, and store-of-value in an ideal fashion, providing probabilistic scalability whilst remaining decentralized according to Bitcoin design. It is accessible to ERC-20 via a permissionless and trust-minimized bridge that works in both directions. The bridge and token platform are currently available on the Syscoin mainnet. This has been gaining recent attention for use by loyalty point programs and stablecoins such as Binance USD.

Solutions

Syscoin Foundation identified a few paths for Reddit to leverage this infrastructure, each with trade-offs. The first provides the most cost-savings and scaling benefits at some sacrifice of token autonomy. The second offers more preservation of autonomy with a more narrow scope of cost savings than the first option, but savings even so. The third introduces more complexity than the previous two yet provides the most overall benefits. We consider the third as most viable as it enables Reddit to benefit even while retaining existing smart contract functionality. We will focus on the third option, and include the first two for good measure.
  1. Distribution, burns and user-to-user transfers of Reddit Points are entirely carried out on the Syscoin network. This full-on approach to utilizing the Syscoin network provides the most scalability and transaction cost benefits of these scenarios. The tradeoff here is distribution and subscription handling likely migrating away from smart contracts into the application layer.
  2. The Reddit Community Points ecosystem can continue to use existing smart contracts as they are used today on the Ethereum mainchain. Users migrate a portion of their tokens to Syscoin, the scaling network, to gain much lower fees, scalability, and a proven base layer, without sacrificing sovereign ownership. They would use Syscoin for user-to-user transfers. Tips redeemable in ten seconds or less, a high-throughput relay network, and onchain settlement at a block target of 60 seconds.
  3. Integration between Matic Network and Syscoin Platform - similar to Syscoin’s current integration with Ethereum - will provide Reddit Community Points with EVM scalability (including the Memberships ERC777 operator) on the Matic side, and performant simple value transfers, robust decentralized security, and sovereign store-of-value on the Syscoin side. It’s “the best of both worlds”. The trade-off is more complex interoperability.

Syscoin + Matic Integration

Matic and Blockchain Foundry Inc, the public company formed by the founders of Syscoin, recently entered a partnership for joint research and business development initiatives. This is ideal for all parties as Matic Network and Syscoin Platform provide complementary utility. Syscoin offers characteristics for sovereign ownership and security based on Bitcoin’s time-tested model, and shares a significant portion of Bitcoin’s own hashpower. Syscoin’s focus is on secure and scalable simple value transfers, trust-minimized interoperability, and opt-in regulatory compliance for tokenized assets rather than scalability for smart contract execution. On the other hand, Matic Network can provide scalable EVM for smart contract execution. Reddit Community Points can benefit from both.
Syscoin + Matic integration is actively being explored by both teams, as it is helpful to Reddit, Ethereum, and the industry as a whole.

Proving Performance & Cost Savings

Our POC focuses on 100,000 on-chain settlements of token transfers on the Syscoin Core blockchain. Transfers and burns perform equally with Syscoin. For POCs related to smart contracts (subscriptions, etc), refer to the Matic Network proposal.
On-chain settlement of 100k transactions was accomplished within roughly twelve minutes, well-exceeding Reddit’s expectation of five days. This was performed using six full-nodes operating on compute-optimized AWS c4.2xlarge instances which were geographically distributed (Virginia, London, Sao Paulo Brazil, Oregon, Singapore, Germany). A higher quantity of settlements could be reached within the same time-frame with more broadcasting nodes involved, or using hosts with more resources for faster execution of the process.
Addresses used: 100,014
The demonstration was executed using this tool. The results can be seen in the following blocks:
612722: https://sys1.bcfn.ca/block/6d47796d043bb4c508d29123e6ae81b051f5e0aaef849f253c8f3a6942a022ce
612723: https://sys1.bcfn.ca/block/8e2077f743461b90f80b4bef502f564933a8e04de97972901f3d65cfadcf1faf
612724: https://sys1.bcfn.ca/block/205436d25b1b499fce44c29567c5c807beaca915b83cc9f3c35b0d76dbb11f6e
612725: https://sys1.bcfn.ca/block/776d1b1a0f90f655a6bbdf559ff5072459cbdc5682d7615ff4b78c00babdc237
612726: https://sys1.bcfn.ca/block/de4df0994253742a1ac8ac9eec8d2a8c8b0a6d72c53d6f3caa29bb6c171b0a6b
612727: https://sys1.bcfn.ca/block/e5e167c52a9decb313fbaadf49a5e34cb490f8084f642a850385476d4ef10d70
612728: https://sys1.bcfn.ca/block/ab64d989edc71890e7b5b8491c20e9a27520dc45a5f7c776d3dae79057f59fe7
612729: https://sys1.bcfn.ca/block/5e8b7ecd0e36f99d07e4ea6e135fc952bf7ec30164ab6f4d1e98b0f2d405df6d
612730: https://sys1.bcfn.ca/block/d395df3d31dde60bbb0bece6bd5b358297da878f0beb96be389e5f0e043580a3
It is important to note that this POC is not focused on Z-DAG. The performance of Z-DAG has been benchmarked within realistic network conditions: Whiteblock’s audit is publicly available. Network latency tests showed an average TPS around 15k with burst capacity up to 61k. Zero-latency control group exhibited ~150k TPS. Mainnet testing of the Z-DAG network is achievable and will require further coordination and additional resources.
Even further optimizations are expected in the upcoming Syscoin Core release which will implement a UTXO model for our token layer bringing further efficiency as well as open the door to additional scaling technology currently under research by our team and academic partners. At present our token layer is account-based, similar to Ethereum. Opt-in compliance structures will also be introduced soon which will offer some positive performance characteristics as well. It makes the most sense to implement these optimizations before performing another benchmark for Z-DAG, especially on the mainnet considering the resources required to stress-test this network.

Cost Savings

Total cost for these 100k transactions: $0.63 USD
See the live fee comparison for savings estimation between transactions on Ethereum and Syscoin. Below is a snapshot at time of writing:
ETH price: $318.55 ETH gas price: 55.00 Gwei ($0.37)
Syscoin price: $0.11
Snapshot of live fee comparison chart
Z-DAG provides a more efficient fee-market. A typical Z-DAG transaction costs 0.0000582 SYS. Tokens can be safely redeemed/re-spent within seconds or allowed to settle on-chain beforehand. The costs should remain about this low for microtransactions.
Syscoin will achieve further reduction of fees and even greater scalability with offchain payment channels for assets, with Z-DAG as a resilience fallback. New payment channel technology is one of the topics under research by the Syscoin development team with our academic partners at TU Delft. In line with the calculation in the Lightning Networks white paper, payment channels using assets with Syscoin Core will bring theoretical capacity for each person on Earth (7.8 billion) to have five on-chain transactions per year, per person, without requiring anyone to enter a fee market (aka “wait for a block”). This exceeds the minimum LN expectation of two transactions per person, per year; one to exist on-chain and one to settle aggregated value.

Tools, Infrastructure & Documentation

Syscoin Bridge

Mainnet Demonstration of Syscoin Bridge with the Basic Attention Token ERC-20
A two-way blockchain interoperability system that uses Simple Payment Verification to enable:
  • Any Standard ERC-20 token to be moved from Ethereum to the Syscoin blockchain as a Syscoin Platform Token (SPT), and back to Ethereum
  • Any SPT to be moved from Syscoin to the Ethereum blockchain as an ERC-20 token, and back to Syscoin

Benefits

  • Permissionless
  • No counterparties involved
  • No trading mechanisms involved
  • No third-party liquidity providers required
  • Cross-chain Fractional Supply - 2-way peg - Token supply maintained globally
  • ERC-20s gain vastly improved transactionality with the Syscoin Token Platform, along with the security of bitcoin-core-compliant PoW.
  • SPTs gain access to all the tooling, applications and capabilities of Ethereum for ERC-20, including smart contracts.
https://preview.redd.it/l8t2m8ldh8e51.png?width=1180&format=png&auto=webp&s=b0a955a0181746dc79aff718bd0bf607d3c3aa23
https://preview.redd.it/26htnxzfh8e51.png?width=1180&format=png&auto=webp&s=d0383d3c2ee836c9f60b57eca35542e9545f741d

Source code

https://github.com/syscoin/?q=sysethereum
Main Subprojects

API

Tools to simplify using Syscoin Bridge as a service with dapps and wallets will be released some time after implementation of Syscoin Core 4.2. These will be based upon the same processes which are automated in the current live Sysethereum Dapp that is functioning with the Syscoin mainnet.

Documentation

Syscoin Bridge & How it Works (description and process flow)
Superblock Validation Battles
HOWTO: Provision the Bridge for your ERC-20
HOWTO: Setup an Agent
Developer & User Diligence

Trade-off

The Syscoin Ethereum Bridge is secured by Agent nodes participating in a decentralized and incentivized model that involves roles of Superblock challengers and submitters. This model is open to participation. The benefits here are trust-minimization, permissionless-ness, and potentially less legal/regulatory red-tape than interop mechanisms that involve liquidity providers and/or trading mechanisms.
The trade-off is that due to the decentralized nature there are cross-chain settlement times of one hour to cross from Ethereum to Syscoin, and three hours to cross from Syscoin to Ethereum. We are exploring ways to reduce this time while maintaining decentralization via zkp. Even so, an “instant bridge” experience could be provided by means of a third-party liquidity mechanism. That option exists but is not required for bridge functionality today. Typically bridges are used with batch value, not with high frequencies of smaller values, and generally it is advantageous to keep some value on both chains for maximum availability of utility. Even so, the cross-chain settlement time is good to mention here.

Cost

Ethereum -> Syscoin: Matic or Ethereum transaction fee for bridge contract interaction, negligible Syscoin transaction fee for minting tokens
Syscoin -> Ethereum: Negligible Syscoin transaction fee for burning tokens, 0.01% transaction fee paid to Bridge Agent in the form of the ERC-20, Matic or Ethereum transaction fee for contract interaction.

Z-DAG

Zero-Confirmation Directed Acyclic Graph is an instant settlement protocol that is used as a complementary system to proof-of-work (PoW) in the confirmation of Syscoin service transactions. In essence, a Z-DAG is simply a directed acyclic graph (DAG) where validating nodes verify the sequential ordering of transactions that are received in their memory pools. Z-DAG is used by the validating nodes across the network to ensure that there is absolute consensus on the ordering of transactions and no balances are overflowed (no double-spends).

Benefits

  • Unique fee-market that is more efficient for microtransaction redemption and settlement
  • Uses decentralized means to enable tokens with value transfer scalability that is comparable or exceeds that of credit card networks
  • Provides high throughput and secure fulfillment even if blocks are full
  • Probabilistic and interactive
  • 99.9999% security assurance within 10 seconds
  • Can serve payment channels as a resilience fallback that is faster and lower-cost than falling-back directly to a blockchain
  • Each Z-DAG transaction also settles onchain through Syscoin Core at 60-second block target using SHA-256 Proof of Work consensus
https://preview.redd.it/pgbx84jih8e51.png?width=1614&format=png&auto=webp&s=5f631d42a33dc698365eb8dd184b6d442def6640

Source code

https://github.com/syscoin/syscoin

API

Syscoin-js provides tooling for all Syscoin Core RPCs including interactivity with Z-DAG.

Documentation

Z-DAG White Paper
Useful read: An in-depth Z-DAG discussion between Syscoin Core developer Jag Sidhu and Brave Software Research Engineer Gonçalo Pestana

Trade-off

Z-DAG enables the ideal speed/security tradeoff to be determined per use-case in the application layer. It minimizes the sacrifice required to accept and redeem fast transfers/payments while providing more-than-ample security for microtransactions. This is supported on the premise that a Reddit user receiving points does need security yet generally doesn’t want nor need to wait for the same level of security as a nation-state settling an international trade debt. In any case, each Z-DAG transaction settles onchain at a block target of 60 seconds.

Syscoin Specs

Syscoin 3.0 White Paper
(4.0 white paper is pending. For improved scalability and less blockchain bloat, some features of v3 no longer exist in current v4: Specifically Marketplace Offers, Aliases, Escrow, Certificates, Pruning, Encrypted Messaging)
  • 16MB block bandwidth per minute assuming segwit witness carrying transactions, and transactions ~200 bytes on average
  • SHA256 merge mined with Bitcoin
  • UTXO asset layer, with base Syscoin layer sharing identical security policies as Bitcoin Core
  • Z-DAG on asset layer, bridge to Ethereum on asset layer
  • On-chain scaling with prospect of enabling enterprise grade reliable trustless payment processing with on/offchain hybrid solution
  • Focus only on Simple Value Transfers. MVP of blockchain consensus footprint is balances and ownership of them. Everything else can reduce data availability in exchange for scale (Ethereum 2.0 model). We leave that to other designs, we focus on transfers.
  • Future integrations of MAST/Taproot to get more complex value transfers without trading off trustlessness or decentralization.
  • Zero-knowledge Proofs are a cryptographic new frontier. We are dabbling here to generalize the concept of bridging and also verify the state of a chain efficiently. We also apply it in our Digital Identity projects at Blockchain Foundry (a publicly traded company which develops Syscoin softwares for clients). We are also looking to integrate privacy preserving payment channels for off-chain payments through zkSNARK hub & spoke design which does not suffer from the HTLC attack vectors evident on LN. Much of the issues plaguing Lightning Network can be resolved using a zkSNARK design whilst also providing the ability to do a multi-asset payment channel system. Currently we found a showstopper attack (American Call Option) on LN if we were to use multiple-assets. This would not exist in a system such as this.

Wallets

Web3 and mobile wallets are under active development by Blockchain Foundry Inc as WebAssembly applications and expected for release not long after mainnet deployment of Syscoin Core 4.2. Both of these will be multi-coin wallets that support Syscoin, SPTs, Ethereum, and ERC-20 tokens. The Web3 wallet will provide functionality similar to Metamask.
Syscoin Platform and tokens are already integrated with Blockbook. Custom hardware wallet support currently exists via ElectrumSys. First-class HW wallet integration through apps such as Ledger Live will exist after 4.2.
Current supported wallets
Syscoin Spark Desktop
Syscoin-Qt

Explorers

Mainnet: https://sys1.bcfn.ca (Blockbook)
Testnet: https://explorer-testnet.blockchainfoundry.co

Thank you for close consideration of our proposal. We look forward to feedback, and to working with the Reddit community to implement an ideal solution using Syscoin Platform!

submitted by sidhujag to ethereum [link] [comments]

Fun with Dynamic DNS services and bitcoind

I realize that bitcoind has this capability built in, but thought it might be fun to configure it manually. As some background, most people look at their network and they have some address like 192.168.1.105. That is a private network address. Sites like WhatIsMyIpAddress.com will tell you what your EXTERNAL IP address is. When your running a bitcoin node, people will connect to your external IP.
Problem is... your ISP may cycle that IP address every week or so. bitcoind has a nice feature baked in called discover which will do the work of guessing your external IP as it changes. But if you are doing anything where you need to expose your RPC API externally (*danger*) then it would be nice to have some FQDN to go after to do the IP translation.
Originally, I had always solved this by exposing my node as an onion node. Since onion nodes traverse NATs and firewalls fairly effortlessly this was an easy option. But previously I had played around with Dynamic DNS service. I've used noip.com but there are likely dozens of services out there that will get the job done.
Once you have enabled a NoIP hostname, you can name it in your bitcoin.conf using the externalip=coolbtcnode.ddns.net. Then, assuming you setup all the RPC auth and port forwarding, you could access your node via RPC at coolbtcnode.ddns.net
As I said... it's a redundancy, since discover=1 does most of this for you, but still thought someone might enjoy the tip.
References:
submitted by brianddk to Bitcoin [link] [comments]

is a lightning node also a full bitcoin node?

Or can it be configured to be one?

Meaning, if I have a Lightning node, Can I do things I need a Bitcoin node for, using the Lightning Nodes (bitcoind?) 'built in' node?
submitted by FindingTheBalance2 to lightningnetwork [link] [comments]

What naming convention should I use for a JSON RPC client API designed for multiple languages?

This is the documentation with the original RPC client API specification. The naming convention in the specification is camel case.
Naming conventions might differ in subtle ways for different languages (camel case vs. pascal case), but for some conventions like snake case (Python) or Swift's Fluent Usage API changing the names in the original specification might increase the cognitive load when using the API for those already familiar with the specification.
When searching for different JSON RPC APIs on GitHub, some implementations seem to take advantage of reflection to intercept method calls and pass them to RPC request "as is" so method names for that language are the same as in the original spec. If reflection is not available the names are hardcoded and are mostly the same as the spec, changing only the capitalization of letters for some languages.
Some examples:
Not using Fluent Design in Swift
https://github.com/fanquake/CoreRPC/blob/masteSources/CoreRPC/Blockchain.swift https://github.com/brunophilipe/SwiftRPC/blob/masteSwiftRPC/SwiftRPC+Requests.swift
Not using snake case in Ruby
https://github.com/sinisterchipmunk/bitcoin-client/blob/mastelib/bitcoin-client/client.rb
Changing method names to pascal case in C#
https://github.com/cryptean/bitcoinlib/blob/mastesrc/BitcoinLib/Services/RpcServices/RpcService/RpcService.cs
submitted by rraallvv to learnprogramming [link] [comments]

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How to quickly start mining bitcoins [Easy] - YouTube

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