Building Resilient Systems on AWS: Learn how to design and implement a resilient, highly available, fault-tolerant infrastructure on AWS.Get Bitcoin Value with curl or Node.js Last year I started dabbling in bitcoin.Of course I was immediately cocky as bitcoin value went up 20% as soon as I bought it, then was humbled as bitcoin's value tumbled down 50%.From boathouse to outhouse.From caviar to ramen noodles.Anyways, I was often checking the price of bitcoin because it would move up and down quite quickly.I was going to Coinbase to check but as a developer I prefer to do something nerdy to get the value.I've taken a few moments to get the value of bitcoin in a few programmatic ways.Get Bitcoin Value via Shell + curl If I want to be low-level "nerd alert" mode, I'll use this command: That command will provide the USD value of a single bitcoin.You can use GBP or EUR if you prefer those currencies.Services other than CoinDesk's main feed may provide another currency value.

Get Bitcoin Value via Node.js The lowest level server-side JavaScript would look like this: As you probably know, this post is less about the code and more about working with the CoinDesk API endpoint.CoinDesk does provide other endpoints to get historical bitcoin data, but I'm more concerned about my money now.Armory 0.95.0 Released This release is Segregated Witness compatible.In order to use any version of Bitcoin Core 0.13.1+ after Segregated Witness is activated, you must use this version (0.95) or higher.Previous versions will no longer work.There will be no changes to wallet crypto related operations in this version.Older offline versions of Armory (down to 0.92.x) are still compatible with 0.95 Notable Changes Litenode: Client and Database are split into 2 binaries: ArmoryQt (client) and ArmoryDB (server) Client no longer requires a local Bitcoin node to operate as P2P has moved to ArmoryDB Improved coin control granularity.You now select UTXOs directly.

Added fee per byte options in Send Bitcoins dialog.Fee estimation requires a local bitcoind.Added Segregated Witness read support.This means the database can successfully parse SW transactions.No SW spending feature yet.This will be the subject of another release.Full changelog Added Introducing litenode Client and database are now split in 2 binaries: ArmoryQt (client) and ArmoryDB (server) Clients interface with servers over the FCGI protocol.Server is hardcoded to listen on localhost, default port is 9001 ArmoryDB can serve remote clients through the use of a HTTP daemon.bitcoin charts difficultyExample config file for nginx can be found here: ./nginx_example.conf As a result, bitcoin P2P connectivity has been moved from ArmoryQt to ArmoryDB.most rewarding bitcoin mining pool

This means in turn that clients do not require the presence of a local bitcoin node to operate anymore.By default ArmoryQt spawns and controls ArmoryDB.This will not happen in 2 cases: _ There is already an instance of ArmoryDB listening on localhost:9001 _ ArmoryQt has been pointed to specific ArmoryDB through a combination of the new –armorydb-ip and –armorydb-port command line arguments ArmoryDB requires the presence of a bitcoin node on localhost:8333 and access to raw blockchain data like before.litecoin simple walletThe change to interface with bitcoin nodes remotely (blocks over p2p) is not in the scope of this release ArmoryDB comes with its own set of command line arguments.bitcoin asic miner listThey are described here: ./cppForSwig/BlockUtils.cpp:778 DB modes are selected with the new –db-type cli arg.perusahaan bitcoin

It defaults to –db-type=DB_FULL.Also available are DB_BARE and DB_SUPER.DB_SUPER has no effect currently, it will be implemented in a future release.Introducing an extra dataset to resolve random transaction hashes.This database is ~550MB with the current blockchain size.This comes in addition to the previous db features of 0.94.This is the default mode, i.e.To disable this feature (revert to the bare 0.94 db), use –db-type=DB_BARE.You cannot swap db modes on top of an existing db, you will need to build one from scratch instead.cambio bitcoin litecoinArmoryDB now uses its own log file (dbLog.txt), running in the –datadir folder 0.95 db format changed from 0.94, you will have to build it in another –dbdir Added DB version detection.bitcoin qt spaceMismatch in DB version will result in an error message and termination on the client side, a stdout warning on the server terminal side as well as in the db log file.transfer bitcoin from coinbase to btc-e

new cli args have been introduced to control db resource consumption: _ –ram_usage: int >= 1.Each point is worth ~128MB RAM on top of the baseline needs.There is no upper bound, be careful when using high values.<= 0 values result in use of default._ –thread-count: int >= 1.Defaults to CPU max thread count.As with ram-usage, use large upper values with care.Improved coin control granularity.Failure to broadcast zero confirmation transactions to the network are now reported with the specific reject message from your node.ethereum hashrate chartMakes use of bitcoind’s new cookie authentication in order to access bitcoind’s JSON-RPC interface Can now make use of the JSON-RPC calls for estimatefee and estimatepriority regardless of whether Armory is managing bitcoind.Those RPC calls will only work if client is local, i.e.ArmoryDB and bitcoind are being run on the same computer as ArmoryQt.Fixed Fixed the missing transaction issue in the Tx Details dialog through the addition of the new resolver dataset Removed ArmoryQt does not interface nor require the presence of a local bitcoin node to operate online anymore.