GitHub - bitcoinjs/blkdat-stream: A blk*.dat streaming

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submitted by primetalent to u/primetalent [link] [comments]

Ubuntu cannot generate wallet

I have a brand new fresh install of Ubuntu with bitcoin core. Joinmarket installed as per instructions. Bitcoin.conf file copied over from a windows machine and placed in .bitcoin folder. Joinmarket.cfg also copied over and placed in joinmarket-0.1.4 folder. I confirmed that both usernames and passwords match. These config files were working well on the windows machine. Going through TOR. After bitcoin core was up to date, I tried to generate a new wallet. Here is what I get.
[email protected]:~/joinmarket-0.1.4$ python generate 2016-06-12 18:33:25,452 [MainThread ] [DEBUG] hello joinmarket Traceback (most recent call last): File "", line 81, in  load_program_config() File "/home/jg/joinmarket-0.1.4/joinmarket/", line 236, in load_program_config global_singleton.config) File "/home/jg/joinmarket-0.1.4/joinmarket/", line 260, in get_blockchain_interface_instance rpc_password = _config.get("BLOCKCHAIN", "rpc_password") File "/uslib/python2.7/", line 623, in get return self._interpolate(section, option, value, d) File "/uslib/python2.7/", line 691, in _interpolate self._interpolate_some(option, L, rawval, section, vars, 1) File "/uslib/python2.7/", line 732, in _interpolate_some "'%%' must be followed by '%%' or '(', found: %r" % (rest,)) ConfigParser.InterpolationSyntaxError: '%' must be followed by '%' or '(', found: '%]{8hjkDsa' 
I feel like something simple is wrong.
I was able to make a wallet by first deleting the joinmarket.cfg file. After that, I could not get it to connect to bitcoin core. It can connect to blockr but I don't want to do that. Here is the updated error I get when I try to see the wallet addresses.
[email protected]:~/joinmarket-0.1.4$ python wallet.json 2016-06-12 21:32:58,736 [MainThread ] [DEBUG] hello joinmarket Traceback (most recent call last): File "", line 81, in  load_program_config() File "/home/jg/joinmarket-0.1.4/joinmarket/", line 236, in load_program_config global_singleton.config) File "/home/jg/joinmarket-0.1.4/joinmarket/", line 262, in get_blockchain_interface_instance bc_interface = BitcoinCoreInterface(rpc, network) File "/home/jg/joinmarket-0.1.4/joinmarket/", line 536, in __init__ blockchainInfo ="getblockchaininfo", []) File "/home/jg/joinmarket-0.1.4/joinmarket/", line 111, in call response = self.queryHTTP(request) File "/home/jg/joinmarket-0.1.4/joinmarket/", line 97, in queryHTTP raise exc joinmarket.jsonrpc.JsonRpcConnectionError: authentication for JSON-RPC failed 
submitted by dancanthe to joinmarket [link] [comments]

How to check a list of strings is of a given format, then stripping the pre/appended characters for each string

I'm coding a blockchain parser related to Bitcoin transaction.
The project utilises an API call to the blocktrail module, which is essentially returning a dictionary (json) type of transactions.
def getTxnOutputs(txid, stripped=False): """Take TxID and return a list of hex script (OP Data). If stripped = True, return list of hex values stripped of pre/appended OP codes """ txnObj = blocktrail_client.transaction(txid) outputs = (txnObj).get('outputs') hashes = [(t['script_hex']).encode() for t in outputs] # encode b/c objects are unicode if not stripped: return hashes elif stripped: return stripOPCodes(hashes) 
Assume hashes = ["76a914xxxxxxxxxxxxxxxxxxxx88ac", "76a914yyyyyyyyyyyyyyyyyyyy88ac", "76a914zzzzzzzzzzzzzzzzzzzz88ac"] (where 50 > len(hashes) > 20)
So I need a function stripOPCodes which will:
  1. Check that all strings start with "76a914" and ends with "88ac"
  2. Check that xxxxxxxxxxxx, yyyyyyyyyyyyyy etc are all of length = 40
  3. Return a list of string with the "76a914", "88ac" strings removed from the start and end, respectively
I have written up code, however I'm looking to ID cases where:
  1. length of string may be wrong
  2. string ONLY begins with "6a"
Here's the code I have, but it's probably needing improvement:
def is_op_dup(data_item): """Checks script is for a standard Txn and returns True if it is""" a,b,c,d,e,f = str(data_item).split() assert (len(d) == int(c[2:], 16)) return data_item def stripOPCodes(txn_obj): """Strip OP codes from hex data (eg pubkeyScript) leaving 20 bytes of hex data returned as a string, or list of strings""" if isinstance(txn_obj, list): hashes = [x for x in txn_obj] # CHECK 76A914 / 88AC return map(lambda x: x[6:-4], hashes) 
submitted by AussieCryptoCurrency to learnpython [link] [comments]

Python Bitcoin module tutorial Opencart bitcoin payment module Blockchain Module Part 1, Video 1: 30,000 ft: Slides Python Bitcoin Tutorial for Beginners Cryptocurrencies and Blockchain 101 for Total Newbies Module 1

import os from blockchain_parser.blockchain import Blockchain # To get the blocks ordered by height, you need to provide the path of the # `index` directory (LevelDB index) being maintained by bitcoind. It contains #.ldb files and is present inside the `blocks` directory. for block in blockchain.get_ordered_blocks(os.path.expanduser(' ~/.bitcoin/blocks/index '), end = 1000): print (" height SoChain's fast blockchain API is the easiest, most cost-effective way to build applications on Dogecoin, Bitcoin, and Litecoin. We also offer Test Networks for developers to get started in a sandbox environment. Currency is just the first application of the Blockchain, and there's alot more to come. We're helping you A blk*.dat streaming module, useful for parsing the Bitcoin blockchain - bitcoinjs/blkdat-stream Bitcoin Core 0.15.0 contains the following changes to the RPC interface and bitcoin-cli for multi-wallet: When running Bitcoin Core with a single wallet, there are no changes to the RPC interface or bitcoin-cli. All RPC calls and bitcoin-cli commands continue to work as before. The Block Parser reads blocks and transactions from the local .bitcoin folder populated by the o cial bitcoind client and exports the blockchain data to the blockchain DB, which uses a custom relational schema that we designed to obtain good performance (see x3.3). This allows for a fast updating of data from the Bitcoin network.

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Python Bitcoin module tutorial

Building your own cryptocurrency trading bot using Python and the Poloniex API - Duration: 14:06. Cryptocurrency Trading 254,773 views This visualization was created using the bitcoin blockchain parser written by John W. Ratcliff to extract the data on a daily basis. I was able to extract the balance of every single bitcoin ... Blockchain Module Part 1, Video 1: 30,000 ft: Slides Andreas Park. ... Bitcoin Trading for Beginners (A Guide in Plain English) - Duration: 18:48. 99Bitcoins Recommended for you. API opencart bitcoin payment module. Price is $15, skype: makegadget, mail: [email protected] Lifetime support. Cryptocurrencies and Blockchain 101 for Total Newbies Module 1 Webinar, December 21, 2017.

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