Class: Bitcoin::Protocol::Tx

Inherits:
Object
  • Object
show all
Defined in:
lib/bitcoin/protocol/tx.rb

Constant Summary collapse

MARKER = 
0
FLAG = 
1
SIGHASH_TYPE = 
Script::SIGHASH_TYPE
DEFAULT_BLOCK_PRIORITY_SIZE = 
27000

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data = nil) ⇒ Tx

create tx from raw binary data



53
54
55
56
57
 
# File 'lib/bitcoin/protocol/tx.rb', line 53

def initialize(data=nil)
  @ver, @lock_time, @in, @out, @scripts = 1, 0, [], [], []
  @enable_bitcoinconsensus = !!ENV['USE_BITCOINCONSENSUS']
  parse_data_from_io(data) if data
end

Instance Attribute Details

#flag ⇒ Object

Returns the value of attribute flag.



37
38
39
 
# File 'lib/bitcoin/protocol/tx.rb', line 37

def flag
  @flag
end

#hash ⇒ Object (readonly)

transaction hash



16
17
18
 
# File 'lib/bitcoin/protocol/tx.rb', line 16

def hash
  @hash
end

#in ⇒ Object (readonly) Also known as: inputs

inputs (Array of TxIn)



19
20
21
 
# File 'lib/bitcoin/protocol/tx.rb', line 19

def in
  @in
end

#lock_time ⇒ Object

lock time



31
32
33
 
# File 'lib/bitcoin/protocol/tx.rb', line 31

def lock_time
  @lock_time
end

#marker ⇒ Object

Returns the value of attribute marker.



36
37
38
 
# File 'lib/bitcoin/protocol/tx.rb', line 36

def marker
  @marker
end

#out ⇒ Object (readonly) Also known as: outputs

outputs (Array of TxOut)



22
23
24
 
# File 'lib/bitcoin/protocol/tx.rb', line 22

def out
  @out
end

#payload ⇒ Object (readonly)

raw protocol payload



25
26
27
 
# File 'lib/bitcoin/protocol/tx.rb', line 25

def payload
  @payload
end

#scripts ⇒ Object (readonly)

parsed / evaluated input scripts cached for later use



34
35
36
 
# File 'lib/bitcoin/protocol/tx.rb', line 34

def scripts
  @scripts
end

#ver ⇒ Object

version (usually 1)



28
29
30
 
# File 'lib/bitcoin/protocol/tx.rb', line 28

def ver
  @ver
end

Class Method Details

.binary_from_hash(h) ⇒ Object

convert ruby hash to raw binary



419
420
421
422
 
# File 'lib/bitcoin/protocol/tx.rb', line 419

def self.binary_from_hash(h)
  tx = from_hash(h)
  tx.to_payload
end

.binary_from_json(json_string) ⇒ Object

convert json representation to raw binary



428
 
# File 'lib/bitcoin/protocol/tx.rb', line 428

def self.binary_from_json(json_string); from_json(json_string).to_payload; end

.from_file(path) ⇒ Object

read binary block from a file



431
 
# File 'lib/bitcoin/protocol/tx.rb', line 431

def self.from_file(path); new( Bitcoin::Protocol.read_binary_file(path) ); end

.from_hash(h, do_raise = true) ⇒ Object

parse ruby hash (see also #to_hash)



399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
 
# File 'lib/bitcoin/protocol/tx.rb', line 399

def self.from_hash(h, do_raise=true)
  tx = new(nil)
  tx.ver, tx.lock_time = (h['ver'] || h['version']), h['lock_time']
  ins  = h['in']  || h['inputs']
  outs = h['out'] || h['outputs']
  ins .each{|input|
    tx.add_in(TxIn.from_hash(input))
  }
  outs.each{|output|  tx.add_out TxOut.from_hash(output) }
  tx.instance_eval{
    @hash = hash_from_payload(to_old_payload)
    @payload = to_payload
  }
  if h['hash'] && (h['hash'] != tx.hash)
    raise "Tx hash mismatch! Claimed: #{h['hash']}, Actual: #{tx.hash}" if do_raise
  end
  tx
end

.from_json(json_string) ⇒ Object

parse json representation



425
 
# File 'lib/bitcoin/protocol/tx.rb', line 425

def self.from_json(json_string); from_hash( JSON.load(json_string) ); end

.from_json_file(path) ⇒ Object

read json block from a file



434
 
# File 'lib/bitcoin/protocol/tx.rb', line 434

def self.from_json_file(path); from_json( Bitcoin::Protocol.read_binary_file(path) ); end

Instance Method Details

#==(other) ⇒ Object

compare to another tx



43
44
45
 
# File 'lib/bitcoin/protocol/tx.rb', line 43

def ==(other)
  @hash == other.hash
end

#add_in(input) ⇒ Object

add an input



71
 
# File 'lib/bitcoin/protocol/tx.rb', line 71

def add_in(input); (@in ||= []) << input; end

#add_out(output) ⇒ Object

add an output



74
 
# File 'lib/bitcoin/protocol/tx.rb', line 74

def add_out(output); (@out ||= []) << output; end

#binary_hash ⇒ Object

return the tx hash in binary format



48
49
50
 
# File 'lib/bitcoin/protocol/tx.rb', line 48

def binary_hash
  @binary_hash ||= [@hash].pack("H*").reverse
end

#bitcoinconsensus_verify_script(in_idx, outpoint_data, block_timestamp = Time.now.to_i, opts = {}) ⇒ Object 



356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
 
# File 'lib/bitcoin/protocol/tx.rb', line 356

def bitcoinconsensus_verify_script(in_idx, outpoint_data, block_timestamp=Time.now.to_i, opts={})
  raise "Bitcoin::BitcoinConsensus shared library not found" unless Bitcoin::BitcoinConsensus.lib_available?

  outpoint_idx  = @in[in_idx].prev_out_index
  script_pubkey = script_pubkey_from_outpoint_data(outpoint_data, outpoint_idx)

  flags  = Bitcoin::BitcoinConsensus::SCRIPT_VERIFY_NONE
  flags |= Bitcoin::BitcoinConsensus::SCRIPT_VERIFY_P2SH        if block_timestamp >= 1333238400
  flags |= Bitcoin::BitcoinConsensus::SCRIPT_VERIFY_SIGPUSHONLY if opts[:verify_sigpushonly]
  flags |= Bitcoin::BitcoinConsensus::SCRIPT_VERIFY_MINIMALDATA if opts[:verify_minimaldata]
  flags |= Bitcoin::BitcoinConsensus::SCRIPT_VERIFY_CLEANSTACK  if opts[:verify_cleanstack]
  flags |= Bitcoin::BitcoinConsensus::SCRIPT_VERIFY_LOW_S       if opts[:verify_low_s]

  payload ||= to_payload
  Bitcoin::BitcoinConsensus.verify_script(in_idx, script_pubkey, payload, flags)
end

#calculate_minimum_fee(allow_free = true, mode = :block) ⇒ Object 



475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
 
# File 'lib/bitcoin/protocol/tx.rb', line 475

def calculate_minimum_fee(allow_free=true, mode=:block)
  # Base fee is either nMinTxFee or nMinRelayTxFee
  base_fee  = (mode == :relay) ? Bitcoin.network[:min_relay_tx_fee] : Bitcoin.network[:min_tx_fee]
  tx_size   = to_payload.bytesize
  min_fee   = (1 + tx_size / 1_000) * base_fee

  if allow_free
    # There is a free transaction area in blocks created by most miners,
    # * If we are relaying we allow transactions up to DEFAULT_BLOCK_PRIORITY_SIZE - 1000
    #   to be considered to fall into this category. We don't want to encourage sending
    #   multiple transactions instead of one big transaction to avoid fees.
    # * If we are creating a transaction we allow transactions up to 1,000 bytes
    #   to be considered safe and assume they can likely make it into this section.
    min_fee = 0 if tx_size < (mode == :block ? Bitcoin.network[:free_tx_bytes] : DEFAULT_BLOCK_PRIORITY_SIZE - 1_000)
  end

  # This code can be removed after enough miners have upgraded to version 0.9.
  # Until then, be safe when sending and require a fee if any output is less than CENT
  if min_fee < base_fee && mode == :block
    outputs.each do |output|
      if output.value < Bitcoin.network[:dust]
        # If per dust fee, then we add min fee for each output less than dust.
        # Otherwise, we set to min fee if there is any output less than dust.
        if Bitcoin.network[:per_dust_fee]
          min_fee += base_fee
        else
          min_fee = base_fee
          break
        end
      end
    end
  end

  min_fee = Bitcoin::network[:max_money] unless min_fee.between?(0, Bitcoin::network[:max_money])
  min_fee
end

#hash_from_payload(payload) ⇒ Object Also known as: generate_hash

generate the tx hash for given payload in hex format



60
61
62
 
# File 'lib/bitcoin/protocol/tx.rb', line 60

def hash_from_payload(payload)
  Digest::SHA256.digest(Digest::SHA256.digest( payload )).reverse_hth
end

#is_coinbase? ⇒ Boolean

Returns:

  • (Boolean) 


512
513
514
 
# File 'lib/bitcoin/protocol/tx.rb', line 512

def is_coinbase?
  inputs.size == 1 and inputs.first.coinbase?
end

#is_final?(block_height, block_time) ⇒ Boolean

Checks if transaction is final taking into account height and time of a block in which it is located (or about to be included if it’s unconfirmed tx).

Returns:

  • (Boolean) 


442
443
444
445
446
447
448
449
450
451
452
453
454
 
# File 'lib/bitcoin/protocol/tx.rb', line 442

def is_final?(block_height, block_time)
  # No time lock - tx is final.
  return true if lock_time == 0

  # Time based nLockTime implemented in 0.1.6
  # If lock_time is below the magic threshold treat it as a block height.
  # If lock_time is above the threshold, it's a unix timestamp.
  return true if lock_time < (lock_time < Bitcoin::LOCKTIME_THRESHOLD ? block_height : block_time)

  inputs.each{|input| return false if !input.is_final? }

  return true
end

#legacy_sigops_count ⇒ Object 



456
457
458
459
460
461
462
463
464
465
466
467
468
 
# File 'lib/bitcoin/protocol/tx.rb', line 456

def legacy_sigops_count
  # Note: input scripts normally never have any opcodes since every input script 
  # can be statically reduced to a pushdata-only script.
  # However, anyone is allowed to create a non-standard transaction with any opcodes in the inputs.
  count = 0
  self.in.each do |txin|
    count += Bitcoin::Script.new(txin.script_sig).sigops_count_accurate(false)
  end
  self.out.each do |txout|
    count += Bitcoin::Script.new(txout.pk_script).sigops_count_accurate(false)
  end
  count
end

#lexicographical_sort! ⇒ Object

sort transaction inputs and outputs under BIP 69 github.com/bitcoin/bips/blob/master/bip-0069.mediawiki



528
529
530
531
 
# File 'lib/bitcoin/protocol/tx.rb', line 528

def lexicographical_sort!
  inputs.sort_by!{|i| [i.previous_output, i.prev_out_index]}
  outputs.sort_by!{|o| [o.amount, o.pk_script.bth]}
end

#minimum_block_fee ⇒ Object 



473
 
# File 'lib/bitcoin/protocol/tx.rb', line 473

def minimum_block_fee; calculate_minimum_fee(allow_free=true, :block); end

#minimum_relay_fee ⇒ Object 



472
 
# File 'lib/bitcoin/protocol/tx.rb', line 472

def minimum_relay_fee; calculate_minimum_fee(allow_free=true, :relay); end

#normalized_hash ⇒ Object Also known as: nhash 



516
517
518
 
# File 'lib/bitcoin/protocol/tx.rb', line 516

def normalized_hash
  signature_hash_for_input(-1, nil, SIGHASH_TYPE[:all]).reverse.hth
end

#parse_data_from_io(data) ⇒ Object Also known as: parse_data

parse raw binary data



77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
 
# File 'lib/bitcoin/protocol/tx.rb', line 77

def parse_data_from_io(data)
  buf = data.is_a?(String) ? StringIO.new(data) : data

  @ver = buf.read(4).unpack("V")[0]

  return false if buf.eof?

  # segwit serialization format is defined by https://github.com/bitcoin/bips/blob/master/bip-0144.mediawiki
  # Also note that it is impossible to parse 0 input transactions. Regular transactions with 0 inputs look
  # like malformed segwit transactions.
  @marker = buf.read(1).unpack('c').first
  @flag = buf.read(1).unpack('c').first

  witness = @marker == 0 && @flag != 0

  # Non-segwit format does not contain marker or flag fields.
  buf.seek(buf.pos - 2) unless witness

  in_size = Protocol.unpack_var_int_from_io(buf)

  @in = []
  in_size.times{
    break if buf.eof?
    @in << TxIn.from_io(buf)
  }

  return false if buf.eof?

  out_size = Protocol.unpack_var_int_from_io(buf)
  @out = []
  out_size.times{
    break if buf.eof?
    @out << TxOut.from_io(buf)
  }

  return false if buf.eof?

  if witness
    in_size.times do |i|
      witness_count = Protocol.unpack_var_int_from_io(buf)
      witness_count.times do
        size = Protocol.unpack_var_int_from_io(buf)
        @in[i].script_witness.stack << buf.read(size)
      end
    end
  end

  @lock_time = buf.read(4).unpack("V")[0]

  @hash = hash_from_payload(to_old_payload)
  @payload = to_payload

  if buf.eof?
    true
  else
    data.is_a?(StringIO) ? buf : buf.read
  end
end

#refresh_hash ⇒ Object

refresh_hash recalculates the tx hash and sets it on the instance



66
67
68
 
# File 'lib/bitcoin/protocol/tx.rb', line 66

def refresh_hash
  @hash = generate_hash(to_old_payload)
end

#signature_hash_for_input(input_idx, subscript, hash_type = nil, prev_out_value = nil, fork_id = nil) ⇒ Object

generate a signature hash for input input_idx. either pass the outpoint_tx or the script_pubkey directly.



171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
 
# File 'lib/bitcoin/protocol/tx.rb', line 171

def signature_hash_for_input(input_idx, subscript, hash_type=nil, prev_out_value=nil, fork_id=nil)
  # https://github.com/bitcoin/bitcoin/blob/e071a3f6c06f41068ad17134189a4ac3073ef76b/script.cpp#L834
  # http://code.google.com/p/bitcoinj/source/browse/trunk/src/com/google/bitcoin/core/Script.java#318
  # https://en.bitcoin.it/wiki/OP_CHECKSIG#How_it_works
  # https://github.com/bitcoin/bitcoin/blob/c2e8c8acd8ae0c94c70b59f55169841ad195bb99/src/script.cpp#L1058
  # https://en.bitcoin.it/wiki/OP_CHECKSIG

  hash_type ||= SIGHASH_TYPE[:all]

  # fork_id is optional and if set, SIGHASH_FORKID flag as defined by the
  # Bitcoin Cash protocol will be respected.
  #
  # https://github.com/Bitcoin-ABC/bitcoin-abc/blob/master/doc/abc/replay-protected-sighash.md
  if fork_id && (hash_type&SIGHASH_TYPE[:forkid]) != 0
    raise "SIGHASH_FORKID is enabled, so prev_out_value is required" if prev_out_value.nil?

    # According to the spec, we should modify the sighash by replacing the 24 most significant
    # bits with the fork ID. However, Bitcoin ABC does not currently implement this since the
    # fork_id is an implicit 0 and it would make the sighash JSON tests fail. Will leave as a
    # TODO for now.
    raise NotImplementedError, "fork_id must be 0" unless fork_id == 0

    script_code = Bitcoin::Protocol.pack_var_string(subscript)
    return signature_hash_for_input_bip143(input_idx, script_code, prev_out_value, hash_type)
  end

  # Note: BitcoinQT checks if input_idx >= @in.size and returns 1 with an error message.
  # But this check is never actually useful because BitcoinQT would crash 
  # right before VerifyScript if input index is out of bounds (inside CScriptCheck::operator()()).
  # That's why we don't need to do such a check here.
  #
  # However, if you look at the case SIGHASH_TYPE[:single] below, we must 
  # return 1 because it's possible to have more inputs than outputs and BitcoinQT returns 1 as well.
  return "\x01".ljust(32, "\x00") if input_idx >= @in.size # ERROR: SignatureHash() : input_idx=%d out of range

  pin  = @in.map.with_index{|input,idx|
    if idx == input_idx
      subscript = subscript.out[ input.prev_out_index ].script if subscript.respond_to?(:out) # legacy api (outpoint_tx)

      # Remove all instances of OP_CODESEPARATOR from the script.
      parsed_subscript = Script.new(subscript)
      parsed_subscript.chunks.delete(Script::OP_CODESEPARATOR)
      subscript = parsed_subscript.to_binary

      input.to_payload(subscript)
    else
      case (hash_type & 0x1f)
      when SIGHASH_TYPE[:none];   input.to_payload("", "\x00\x00\x00\x00")
      when SIGHASH_TYPE[:single]; input.to_payload("", "\x00\x00\x00\x00")
      else;                       input.to_payload("")
      end
    end
  }

  pout = @out.map(&:to_payload)
  in_size, out_size = Protocol.pack_var_int(@in.size), Protocol.pack_var_int(@out.size)

  case (hash_type & 0x1f)
  when SIGHASH_TYPE[:none]
    pout = ""
    out_size = Protocol.pack_var_int(0)
  when SIGHASH_TYPE[:single]
    return "\x01".ljust(32, "\x00") if input_idx >= @out.size # ERROR: SignatureHash() : input_idx=%d out of range (SIGHASH_SINGLE)
    pout = @out[0...(input_idx+1)].map.with_index{|out,idx| (idx==input_idx) ? out.to_payload : out.to_null_payload }.join
    out_size = Protocol.pack_var_int(input_idx+1)
  end

  if (hash_type & SIGHASH_TYPE[:anyonecanpay]) != 0
    in_size, pin = Protocol.pack_var_int(1), [ pin[input_idx] ]
  end

  buf = [ [@ver].pack("V"), in_size, pin, out_size, pout, [@lock_time, hash_type].pack("VV") ].join
  Digest::SHA256.digest( Digest::SHA256.digest( buf ) )
end

#signature_hash_for_witness_input(input_idx, witness_program, prev_out_value, witness_script = nil, hash_type = nil, skip_separator_index = 0) ⇒ Object

generate a witness signature hash for input input_idx. github.com/bitcoin/bips/blob/master/bip-0143.mediawiki



248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
 
# File 'lib/bitcoin/protocol/tx.rb', line 248

def signature_hash_for_witness_input(input_idx, witness_program, prev_out_value, witness_script = nil, hash_type=nil, skip_separator_index = 0)
  return "\x01".ljust(32, "\x00") if input_idx >= @in.size # ERROR: SignatureHash() : input_idx=%d out of range

  hash_type ||= SIGHASH_TYPE[:all]

  script = Bitcoin::Script.new(witness_program)
  raise "ScriptPubkey does not contain witness program." unless script.is_witness?

  if script.is_witness_v0_keyhash?
    script_code = [["1976a914", script.get_hash160, "88ac"].join].pack("H*")
  elsif script.is_witness_v0_scripthash?
    raise "witness script does not match script pubkey" unless Bitcoin::Script.to_witness_p2sh_script(Digest::SHA256.digest(witness_script).bth) == witness_program
    script = skip_separator_index > 0 ? Bitcoin::Script.new(witness_script).subscript_codeseparator(skip_separator_index) : witness_script
    script_code = Bitcoin::Protocol.pack_var_string(script)
  end

  signature_hash_for_input_bip143(input_idx, script_code, prev_out_value, hash_type)
end

#size ⇒ Object 



436
437
438
 
# File 'lib/bitcoin/protocol/tx.rb', line 436

def size
  payload.bytesize
end

#to_hash(options = {}) ⇒ Object

convert to ruby hash (see also #from_hash)



374
375
376
377
378
379
380
381
382
383
384
385
 
# File 'lib/bitcoin/protocol/tx.rb', line 374

def to_hash(options = {})
  @hash ||= hash_from_payload(to_old_payload)
  h = {
    'hash' => @hash, 'ver' => @ver, # 'nid' => normalized_hash,
    'vin_sz' => @in.size, 'vout_sz' => @out.size,
    'lock_time' => @lock_time, 'size' => (@payload ||= to_payload).bytesize,
    'in'  =>  @in.map{|i|i.to_hash(options)},
    'out' => @out.map{|o| o.to_hash(options) }
  }
  h['nid'] = normalized_hash  if options[:with_nid]
  h
end

#to_json(options = {:space => ''}, *a) ⇒ Object

generates rawblock json as seen in the block explorer.



388
389
390
 
# File 'lib/bitcoin/protocol/tx.rb', line 388

def to_json(options = {:space => ''}, *a)
  JSON.pretty_generate( to_hash(options), options )
end

#to_json_file(path) ⇒ Object

write json representation to a file (see also #to_json)



394
395
396
 
# File 'lib/bitcoin/protocol/tx.rb', line 394

def to_json_file(path)
  File.open(path, 'wb'){|f| f.print to_json; }
end

#to_old_payload ⇒ Object 



143
144
145
146
147
148
149
150
 
# File 'lib/bitcoin/protocol/tx.rb', line 143

def to_old_payload
  pin = ""
  @in.each{|input| pin << input.to_payload }
  pout = ""
  @out.each{|output| pout << output.to_payload }

  [@ver].pack("V") << Protocol.pack_var_int(@in.size) << pin << Protocol.pack_var_int(@out.size) << pout << [@lock_time].pack("V")
end

#to_payload ⇒ Object

output transaction in raw binary format



139
140
141
 
# File 'lib/bitcoin/protocol/tx.rb', line 139

def to_payload
  witness? ? to_witness_payload : to_old_payload
end

#to_witness_payload ⇒ Object

output transaction in raw binary format with witness



153
154
155
156
157
158
159
 
# File 'lib/bitcoin/protocol/tx.rb', line 153

def to_witness_payload
  buf = [@ver, MARKER, FLAG].pack('Vcc')
  buf << Protocol.pack_var_int(@in.length) << @in.map(&:to_payload).join
  buf << Protocol.pack_var_int(@out.length) << @out.map(&:to_payload).join
  buf << witness_payload << [@lock_time].pack('V')
  buf
end

#verify_input_signature(in_idx, outpoint_data, block_timestamp = Time.now.to_i, opts = {}) ⇒ Object

verify input signature in_idx against the corresponding output in outpoint_tx outpoint. This arg can also be a Script or TxOut.

options are: verify_sigpushonly, verify_minimaldata, verify_cleanstack, verify_dersig, verify_low_s, verify_strictenc, fork_id



272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
 
# File 'lib/bitcoin/protocol/tx.rb', line 272

def verify_input_signature(in_idx, outpoint_data, block_timestamp=Time.now.to_i, opts={})
  if @enable_bitcoinconsensus
    return bitcoinconsensus_verify_script(in_idx, outpoint_data, block_timestamp, opts)
  end

  # If FORKID is enabled, we also ensure strict encoding.
  opts[:verify_strictenc] ||= !!opts[:fork_id]

  outpoint_idx  = @in[in_idx].prev_out_index
  script_sig    = @in[in_idx].script_sig

  amount = amount_from_outpoint_data(outpoint_data, outpoint_idx)
  script_pubkey = script_pubkey_from_outpoint_data(outpoint_data, outpoint_idx)

  if opts[:fork_id] && amount.nil?
    raise "verify_input_signature must be called with a previous transaction or " \
      "transaction output if SIGHASH_FORKID is enabled"
  end

  @scripts[in_idx] = Bitcoin::Script.new(script_sig, script_pubkey)
  return false if opts[:verify_sigpushonly] && !@scripts[in_idx].is_push_only?(script_sig)
  return false if opts[:verify_minimaldata] && !@scripts[in_idx].pushes_are_canonical?
  sig_valid = @scripts[in_idx].run(block_timestamp, opts) do |pubkey,sig,hash_type,subscript|
    hash = signature_hash_for_input(in_idx, subscript, hash_type, amount, opts[:fork_id])
    Bitcoin.verify_signature( hash, sig, pubkey.unpack("H*")[0] )
  end
  # BIP62 rule #6
  return false if opts[:verify_cleanstack] && !@scripts[in_idx].stack.empty?

  return sig_valid
end

#verify_witness_input_signature(in_idx, outpoint_data, prev_out_amount, block_timestamp = Time.now.to_i, opts = {}) ⇒ Object

verify witness input signature in_idx against the corresponding output in outpoint_tx outpoint. This arg can also be a Script or TxOut

options are: verify_sigpushonly, verify_minimaldata, verify_cleanstack, verify_dersig, verify_low_s, verify_strictenc



309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
 
# File 'lib/bitcoin/protocol/tx.rb', line 309

def verify_witness_input_signature(in_idx, outpoint_data, prev_out_amount, block_timestamp=Time.now.to_i, opts={})
  if @enable_bitcoinconsensus
    return bitcoinconsensus_verify_script(in_idx, outpoint_data, block_timestamp, opts)
  end

  outpoint_idx  = @in[in_idx].prev_out_index
  script_sig    = ''

  script_pubkey = script_pubkey_from_outpoint_data(outpoint_data, outpoint_idx)
  script_pubkey = Bitcoin::Script.new(script_pubkey)

  if script_pubkey.is_p2sh?
    redeem_script = Bitcoin::Script.new(@in[in_idx].script_sig).get_pubkey
    script_pubkey = Bitcoin::Script.new(redeem_script.htb) if Bitcoin.hash160(redeem_script) == script_pubkey.get_hash160 # P2SH-P2WPKH or P2SH-P2WSH
  end

  @in[in_idx].script_witness.stack.each{|s|script_sig << Bitcoin::Script.pack_pushdata(s)}
  code_separator_index = 0

  if script_pubkey.is_witness_v0_keyhash? # P2WPKH
    @scripts[in_idx] = Bitcoin::Script.new(script_sig, Bitcoin::Script.to_hash160_script(script_pubkey.get_hash160))
  elsif script_pubkey.is_witness_v0_scripthash? # P2WSH
    witness_hex = @in[in_idx].script_witness.stack.last.bth
    witness_script = Bitcoin::Script.new(witness_hex.htb)
    return false unless Bitcoin.sha256(witness_hex) == script_pubkey.get_hash160
    @scripts[in_idx] = Bitcoin::Script.new(script_sig, Bitcoin::Script.to_p2sh_script(Bitcoin.hash160(witness_hex)))
  else
    return false
  end

  return false if opts[:verify_sigpushonly] && !@scripts[in_idx].is_push_only?(script_sig)
  return false if opts[:verify_minimaldata] && !@scripts[in_idx].pushes_are_canonical?
  sig_valid = @scripts[in_idx].run(block_timestamp, opts) do |pubkey,sig,hash_type,subscript|
    if script_pubkey.is_witness_v0_keyhash?
      hash = signature_hash_for_witness_input(in_idx, script_pubkey.to_payload, prev_out_amount, nil, hash_type)
    elsif script_pubkey.is_witness_v0_scripthash?
      hash = signature_hash_for_witness_input(in_idx, script_pubkey.to_payload, prev_out_amount, witness_hex.htb, hash_type, code_separator_index)
      code_separator_index += 1 if witness_script.codeseparator_count > code_separator_index
    end
    Bitcoin.verify_signature( hash, sig, pubkey.unpack("H*")[0] )
  end
  # BIP62 rule #6
  return false if opts[:verify_cleanstack] && !@scripts[in_idx].stack.empty?

  return sig_valid
end

#witness? ⇒ Boolean

Returns:

  • (Boolean) 


165
166
167
 
# File 'lib/bitcoin/protocol/tx.rb', line 165

def witness?
  !@in.find { |i| !i.script_witness.empty? }.nil?
end

#witness_hash ⇒ Object

get witness hash



522
523
524
 
# File 'lib/bitcoin/protocol/tx.rb', line 522

def witness_hash
  hash_from_payload(to_witness_payload)
end

#witness_payload ⇒ Object 



161
162
163
 
# File 'lib/bitcoin/protocol/tx.rb', line 161

def witness_payload
  @in.map { |i| i.script_witness.to_payload }.join
end