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Transactions – How to send Bitcoin in Testnet?

I am using this library: https://github.com/lian/bitcoin-ruby

And here is my code:

require 'open-uri'
require 'net/http'
require 'net/https'
require 'json'

require 'bitcoin'

Bitcoin.network = :testnet3

def get_response(prev_tx)
  url = "https://testnet.blockexplorer.com/api/rawtx/#{prev_tx}"
  uri = URI(url)
  response = Net::HTTP.get(uri)
  response = JSON.parse(response)
  response = response('rawtx').to_s
  return response
end

def build_transaction(prev_tx, prev_out_index, key, satoshi_to_spend, addr, message)
  include Bitcoin::Builder

  new_tx = build_tx do |t|
    t.input do |i|
      i.prev_out prev_tx
      i.prev_out_index prev_out_index
      i.signature_key key
    end
    t.output do |o|
      o.value satoshi_to_spend
      o.script {|s| s.type :address; s.recipient addr }
    end
  end
  puts ""
  puts "--- new tx ---"
  puts new_tx.to_json
  return new_tx
end

def bin_to_hex(s)
  s.unpack('H*').first
end

bitcoin_key_1_pub = "0367e6251a89c5afc1212c3e2169866ccfe9d6059a4cfc15dc139b534b974fd7ca"
bitcoin_key_1_priv = "*****24c56528becd02d23076123a2edc2f3cf52c3c0202178c1b7fa9ac*****"
bitcoin_key_1_addr = "mxz4hu6JrTHevn22W4GDVjS3ko9MwXuHND"

# the previous transaction that has an output to your address #1
prev_tx_1 = "427138ed5f2443fbfbf8065e990f1bf9ce0236e14376e8abca0b2876eabca653"

# the number of the output you want to use
prev_out_index = 1

# 0.5 BTC in satoshis
btc_to_spend = 0.5
satoshi_to_spend = btc_to_spend * 100000000

bitcoin_key_2_pub = "02989d0578f715a1980d4d6e968bcba487077e74aaf8a219d11ee4384ea1fc1eda"
bitcoin_key_2_priv = "*****cb521a27f9782cc503b461bf5c6b470469ca00ba1d7dc26f4ab61b*****"
bitcoin_key_2_addr = "n4SYP6TJyK7pUouW65fnC1hDBrbb7Za8RR"

# fetch the tx from whereever you like and parse it
response = get_response(prev_tx_1)
$prev_tx = Bitcoin::P::Tx.new(response.htb)
prev_tx = $prev_tx

tx_value = prev_tx.outputs(prev_out_index).value
puts "tx_value: #{tx_value}"

key = Bitcoin::Key.new(bitcoin_key_1_priv, bitcoin_key_1_pub)
tx = build_transaction(prev_tx, prev_out_index, key, satoshi_to_spend, bitcoin_key_2_addr, "hello")

puts ""
puts "--- bin_to_hex ---"
puts bin_to_hex(tx.to_payload)

Here is the output:

➜  examples git:(master) ✗ ruby sandbox.rb

tx_value: 75972791
/Users/glaksmono/.rvm/gems/ruby-2.4.2/gems/bitcoin-ruby-0.0.18/lib/bitcoin/script.rb:281: warning: constant ::Fixnum is deprecated
/Users/glaksmono/.rvm/gems/ruby-2.4.2/gems/bitcoin-ruby-0.0.18/lib/bitcoin/script.rb:455: warning: constant ::Fixnum is deprecated

--- new tx ---
/Users/glaksmono/.rvm/gems/ruby-2.4.2/gems/bitcoin-ruby-0.0.18/lib/bitcoin/script.rb:261: warning: constant ::Fixnum is deprecated
{
  "hash":"88217866a40829f144e2d2c19b2e506812ae013d08d9335ce8fa839582f1b18e",
  "ver":1,
  "vin_sz":1,
  "vout_sz":1,
  "lock_time":0,
  "size":191,
  "in":(
    {
      "prev_out":{
        "hash":"427138ed5f2443fbfbf8065e990f1bf9ce0236e14376e8abca0b2876eabca653",
        "n":1
      },
      "scriptSig":"304402201cf2d99b7f10c71a1c77ae629ec134a3f255c0027f47815aff3e43d500e6da46022008409ea148d6cce6876910c7a7218b8197c3a827a6a7bf3d5f064a3ed3a0616701 0367e6251a89c5afc1212c3e2169866ccfe9d6059a4cfc15dc139b534b974fd7ca"
    }
  ),
  "out":(
    {
      "value":"0.50000000",
      "scriptPubKey":"OP_DUP OP_HASH160 fb75447d6038b05bb736e5b05f18a3c9da2b34db OP_EQUALVERIFY OP_CHECKSIG"
    }
  )
}

--- bin_to_hex ---
010000000153a6bcea76280bcaabe87643e13602cef91b0f995e06f8fbfb43245fed387142010000006a47304402201cf2d99b7f10c71a1c77ae629ec134a3f255c0027f47815aff3e43d500e6da46022008409ea148d6cce6876910c7a7218b8197c3a827a6a7bf3d5f064a3ed3a0616701210367e6251a89c5afc1212c3e2169866ccfe9d6059a4cfc15dc139b534b974fd7caffffffff0180f0fa02000000001976a914fb75447d6038b05bb736e5b05f18a3c9da2b34db88ac00000000

It seems to succeed, but I don't see the BTC really transferred from bitcoin_key_1_addr to bitcoin_key_2_addr in the Blockcypher Explorer:

As you see in Blockcypher Explorer, the amount of BTC is not yet transferred from bitcoin_key_1_addr to bitcoin_key_2_addr. Ideas?

api – Bitcoin cash – Transaction history as JSON

I found this: https://www.blocktrail.com/BCC/json/blockchain/address_txs/{Your address here} / all / {Page number}

Sample response:

{
"transactions": [20 items],
"page": 1,
"perpage": 20,
"txx_count": 71,
"last_time": "1525247636"
}

Maybe you should contact them to get the API key or something because I'm pretty sure they set rate limit.

Monumtrade – monumtrade.com

I am not an administrator

Monumtrade plans:

130%, 140%, 150%, 160% after 3 days

0.0001 BTC – 1 BTC

JOIN HERE

.

How to quickly get the balance of any bitcoin address? (without third party API)

As some people have mentioned (for example, here), the only way to get the balance of an address in the bitcoin core was to import it as an observation-only address and scan the blockchain again. Starting with bitcoin core v0.17, we can use the scantxoutset command, however, this is quite slow:

> time bitcoin-cli scantxoutset "start" "("addr(17Pu3CEx34YX8bpGATq45PfL2fGBCPcr2u)")"
{
  "success": true,
  "searched_items": 64162818,
  "unspents": (
    {
      "txid": "9796cee98fa88efcb9fdb954188d276b73d6e76719af6b5470ad23a2f744ecca",
      "vout": 1,
      "scriptPubKey": "76a91446255848182640edff4d178f365d7824513bc28d88ac",
      "desc": "addr(17Pu3CEx34YX8bpGATq45PfL2fGBCPcr2u)#x2q6xgrk",
      "amount": 0.02155141,
      "height": 607852
    }
  ),
  "total_amount": 0.02155141
}

real    0m42.419s
user    0m0.007s
sys 0m0.003s 

42 seconds is quite slow, I would like to get something comparable to block explorers (less than 2 seconds). Is it possible to achieve faster results with some advanced bitcoin core configuration?

Or, is there an open source project that I can use to index the UTXO set by address? Not sure if libbitcoin, bitcoinj, bitcoinJS, etc. They can do it faster. Some tool block explorers that could use to provide this service would be what I am looking for.

Bip 32 hd wallets: why has Bitcoin Core (GUI) not supported cold storage so far (offline signature) (0.19.0.1)?

Is there any deep reason not to support this? Or is it simply a "good idea, but not a volunteer" situation?

By the way, although Bitcoin Core had supported BIP32 several years ago, it uses reinforced bypass for addresses, which makes it impossible for the side that only observes to get new addresses to receive / change, or use addresses to view transaction history and balance final .

Security: What are some potential scenarios in which a state actor can damage bitcoin if it controls more than 51% of the hashing power?

As recently reported, China controls more than 51% of hashing power and only in one province of China controls 54%. Assuming that China has bad intentions and forces all these mining operators to collude to damage the Bitcoin network. What are some of the potential scenarios to dethrone Bitcoin from # 1?

As I understand it, a 51% attack would only cause a loss of confidence, but it would not kill Bitcoin since the real chain will simply fork on its own.

Bitcoin core: how can I use the backup of the data from the pruned node chain to configure the (archivial) node without IBD?

My configuration is an old laptop (~ 2012) + small SSD and a NAS with HDD. I noticed that trying to synchronize Bitcoin Core (v0.18) on the NAS was slow, but on SSD it was very fast. (Everything is connected via ethernet cables ~ 3 feet in length, so it can't be a network problem, right?)

Then I thought about synchronizing a pruned node, with manual pruning, and periodically backing up the data from /blocks and /chainstate from my datadir to the NAS, before running the plum. My idea was to configure a node with the complete string once the synchronization was performed.

The problem is that it does not work. So, if I run the node with datadir On the NAS, Bitcoin Core will simply close. But if I delete the /blocks and /chainstate NAS directories, IBD starts without problems. (Apart from slow, that is).

So my question is, can this trick be used? If so, how?

If it helps, my bitcoin.conf for the pruned node is

### bicoin.conf of pruned node
debug=0
daemon=1
server=1

prune=1

dbcache=4096

and the one of the complete archiving node in NAS is

### bitcoin.conf of archivial node on NAS
debug=0
daemon=1
server=1

dbcache=4096
par=-1
listen=0

Bitcoin migrating to an ASIC-resistant mining algorithm like RandomX used in Monero

What should happen for Bitcoin to fork into an ASIC-resistant mining algorithm like RandomX used by Monero only for CPU mining?

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