Class: Bitcoin::PSBT::Input

Inherits:
Object
  • Object
show all
Defined in:
lib/bitcoin/psbt/input.rb

Overview

Class for PSBTs which contain per-input information

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(non_witness_utxo: nil, witness_utxo: nil) ⇒ Input

Returns a new instance of Input.



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# File 'lib/bitcoin/psbt/input.rb', line 30

def initialize(non_witness_utxo: nil, witness_utxo: nil)
  @non_witness_utxo = non_witness_utxo
  @witness_utxo = witness_utxo
  @partial_sigs = {}
  @hd_key_paths = {}
  @ripemd160_preimages = {}
  @sha256_preimages = {}
  @hash160_preimages = {}
  @hash256_preimages = {}
  @proprietaries = []
  @tap_script_sigs = {}
  @tap_leaf_scripts = {}
  @tap_bip32_derivations = {}
  @unknowns = {}
end

Instance Attribute Details

#final_script_sig ⇒ Object

Returns the value of attribute final_script_sig.



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# File 'lib/bitcoin/psbt/input.rb', line 12

def final_script_sig
  @final_script_sig
end

#final_script_witness ⇒ Object

Returns the value of attribute final_script_witness.



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# File 'lib/bitcoin/psbt/input.rb', line 13

def final_script_witness
  @final_script_witness
end

#hash160_preimages ⇒ Object

Returns the value of attribute hash160_preimages.



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# File 'lib/bitcoin/psbt/input.rb', line 19

def hash160_preimages
  @hash160_preimages
end

#hash256_preimages ⇒ Object

Returns the value of attribute hash256_preimages.



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# File 'lib/bitcoin/psbt/input.rb', line 20

def hash256_preimages
  @hash256_preimages
end

#hd_key_paths ⇒ Object

Returns the value of attribute hd_key_paths.



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# File 'lib/bitcoin/psbt/input.rb', line 14

def hd_key_paths
  @hd_key_paths
end

#non_witness_utxo ⇒ Object

Bitcoin::Tx



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# File 'lib/bitcoin/psbt/input.rb', line 8

def non_witness_utxo
  @non_witness_utxo
end

#partial_sigs ⇒ Object

Returns the value of attribute partial_sigs.



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# File 'lib/bitcoin/psbt/input.rb', line 15

def partial_sigs
  @partial_sigs
end

#proprietaries ⇒ Object

Returns the value of attribute proprietaries.



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# File 'lib/bitcoin/psbt/input.rb', line 21

def proprietaries
  @proprietaries
end

#redeem_script ⇒ Object

Returns the value of attribute redeem_script.



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# File 'lib/bitcoin/psbt/input.rb', line 10

def redeem_script
  @redeem_script
end

#ripemd160_preimages ⇒ Object

Returns the value of attribute ripemd160_preimages.



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# File 'lib/bitcoin/psbt/input.rb', line 17

def ripemd160_preimages
  @ripemd160_preimages
end

#sha256_preimages ⇒ Object

Returns the value of attribute sha256_preimages.



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# File 'lib/bitcoin/psbt/input.rb', line 18

def sha256_preimages
  @sha256_preimages
end

#sighash_type ⇒ Object

Returns the value of attribute sighash_type.



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# File 'lib/bitcoin/psbt/input.rb', line 16

def sighash_type
  @sighash_type
end

#tap_bip32_derivations ⇒ Object

Returns the value of attribute tap_bip32_derivations.



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# File 'lib/bitcoin/psbt/input.rb', line 25

def tap_bip32_derivations
  @tap_bip32_derivations
end

#tap_internal_key ⇒ Object

Returns the value of attribute tap_internal_key.



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# File 'lib/bitcoin/psbt/input.rb', line 26

def tap_internal_key
  @tap_internal_key
end

#tap_key_sig ⇒ Object

Returns the value of attribute tap_key_sig.



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# File 'lib/bitcoin/psbt/input.rb', line 22

def tap_key_sig
  @tap_key_sig
end

#tap_leaf_scripts ⇒ Object

Returns the value of attribute tap_leaf_scripts.



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# File 'lib/bitcoin/psbt/input.rb', line 24

def tap_leaf_scripts
  @tap_leaf_scripts
end

#tap_merkle_root ⇒ Object

Returns the value of attribute tap_merkle_root.



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# File 'lib/bitcoin/psbt/input.rb', line 27

def tap_merkle_root
  @tap_merkle_root
end

#tap_script_sigs ⇒ Object

Returns the value of attribute tap_script_sigs.



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# File 'lib/bitcoin/psbt/input.rb', line 23

def tap_script_sigs
  @tap_script_sigs
end

#unknowns ⇒ Object

Returns the value of attribute unknowns.



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# File 'lib/bitcoin/psbt/input.rb', line 28

def unknowns
  @unknowns
end

#witness_script ⇒ Object

Returns the value of attribute witness_script.



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# File 'lib/bitcoin/psbt/input.rb', line 11

def witness_script
  @witness_script
end

#witness_utxo ⇒ Object

Bitcoin::TxOut



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# File 'lib/bitcoin/psbt/input.rb', line 9

def witness_utxo
  @witness_utxo
end

Class Method Details

.parse_from_buf(buf) ⇒ Bitcoin::PSBTInput

parse PSBT input data form buffer.

Parameters:

  • buf (StringIO) —

    psbt buffer.

Returns:

  • (Bitcoin::PSBTInput) —

    psbt input.

Raises:

  • (ArgumentError) 


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# File 'lib/bitcoin/psbt/input.rb', line 49

def self.parse_from_buf(buf)
  input = self.new
  found_sep = false
  until buf.eof?
    key_len = Bitcoin.unpack_var_int_from_io(buf)
    if key_len == 0
      found_sep = true
      break
    end
    key_start = buf.pos
    key_type = Bitcoin.unpack_var_int_from_io(buf)
    key = buf.read(key_len - (buf.pos - key_start))
    value = buf.read(Bitcoin.unpack_var_int_from_io(buf))

    case key_type
    when PSBT_IN_TYPES[:non_witness_utxo]
      raise ArgumentError, 'Invalid non-witness utxo typed key.' unless key_len == 1
      raise ArgumentError, 'Duplicate Key, input non-witness utxo already provided.' if input.non_witness_utxo
      input.non_witness_utxo = Bitcoin::Tx.parse_from_payload(value, strict: true)
    when PSBT_IN_TYPES[:witness_utxo]
      raise ArgumentError, 'Invalid input witness utxo typed key.' unless key_len == 1
      raise ArgumentError, 'Duplicate Key, input witness utxo already provided.' if input.witness_utxo
      input.witness_utxo = Bitcoin::TxOut.parse_from_payload(value)
    when PSBT_IN_TYPES[:partial_sig]
      if key.size != Bitcoin::Key::PUBLIC_KEY_SIZE && key.size != Bitcoin::Key::COMPRESSED_PUBLIC_KEY_SIZE
        raise ArgumentError, 'Size of key was not the expected size for the type partial signature pubkey.'
      end
      pubkey = Bitcoin::Key.new(pubkey: key.bth)
      raise ArgumentError, Errors::Messages::INVALID_PUBLIC_KEY unless pubkey.fully_valid_pubkey?
      raise ArgumentError, 'Duplicate Key, input partial signature for pubkey already provided.' if input.partial_sigs[pubkey.pubkey]
      input.partial_sigs[pubkey.pubkey] = value
    when PSBT_IN_TYPES[:sighash]
      raise ArgumentError, 'Invalid input sighash type typed key.' unless key_len == 1
      raise ArgumentError, 'Duplicate Key, input sighash type already provided.' if input.sighash_type
      raise ArgumentError, 'Invalid input sighash type value.' unless value.bytesize == 4
      input.sighash_type = value.unpack1('V')
    when PSBT_IN_TYPES[:redeem_script]
      raise ArgumentError, 'Invalid redeemscript typed key.' unless key_len == 1
      raise ArgumentError, 'Duplicate Key, input redeemScript already provided.' if input.redeem_script
      input.redeem_script = Bitcoin::Script.parse_from_payload(value)
    when PSBT_IN_TYPES[:witness_script]
      raise ArgumentError, 'Invalid witnessscript typed key.' unless key_len == 1
      raise ArgumentError, 'Duplicate Key, input witnessScript already provided.' if input.witness_script
      input.witness_script = Bitcoin::Script.parse_from_payload(value)
    when PSBT_IN_TYPES[:bip32_derivation]
      raise ArgumentError, 'Invalid bip32 typed key.' unless key_len
      raise ArgumentError, 'Duplicate Key, pubkey derivation path already provided.' if input.hd_key_paths[key.bth]
      input.hd_key_paths[key.bth] = Bitcoin::PSBT::HDKeyPath.new(key, Bitcoin::PSBT::KeyOriginInfo.parse_from_payload(value))
    when PSBT_IN_TYPES[:script_sig]
      raise ArgumentError, 'Invalid final scriptsig typed key.' unless key_len == 1
      raise ArgumentError, 'Duplicate Key, input final scriptSig already provided.' if input.final_script_sig
      input.final_script_sig = Bitcoin::Script.parse_from_payload(value)
    when PSBT_IN_TYPES[:script_witness]
      raise ArgumentError, 'Invalid final script witness typed key.' unless key_len == 1
      raise ArgumentError, 'Duplicate Key, input final scriptWitness already provided.' if input.final_script_witness
      input.final_script_witness = Bitcoin::ScriptWitness.parse_from_payload(value)
    when PSBT_IN_TYPES[:ripemd160]
      raise ArgumentError, 'Size of key was not the expected size for the type ripemd160 preimage' unless key.bytesize == RIPEMD160_SIZE
      raise ArgumentError, 'Duplicate Key, input ripemd160 preimage already provided' if input.ripemd160_preimages[key.bth]
      input.ripemd160_preimages[key.bth] = value.bth
    when PSBT_IN_TYPES[:sha256]
      raise ArgumentError, 'Size of key was not the expected size for the type sha256 preimage' unless key.bytesize == SHA256_SIZE
      raise ArgumentError, 'Duplicate Key, input sha256 preimage already provided' if input.sha256_preimages[key.bth]
      input.sha256_preimages[key.bth] = value.bth
    when PSBT_IN_TYPES[:hash160]
      raise ArgumentError, 'Size of key was not the expected size for the type hash160 preimage' unless key.bytesize == HASH160_SIZE
      raise ArgumentError, 'Duplicate Key, input hash160 preimage already provided' if input.hash160_preimages[key.bth]
      input.hash160_preimages[key.bth] = value.bth
    when PSBT_IN_TYPES[:hash256]
      raise ArgumentError, 'Size of key was not the expected size for the type hash256 preimage' unless key.bytesize == HASH256_SIZE
      raise ArgumentError, 'Duplicate Key, input hash256 preimage already provided' if input.hash256_preimages[key.bth]
      input.hash256_preimages[key.bth] = value.bth
    when PSBT_IN_TYPES[:proprietary]
      proprietary = Proprietary.new(key, value)
      raise ArgumentError, 'Duplicate Key, key for proprietary value already provided.' if input.proprietaries.any?{|p| p.key == proprietary.key}
      input.proprietaries << proprietary
    when PSBT_IN_TYPES[:tap_key_sig]
      raise ArgumentError, 'Size of key was not the expected size for the type tap key sig' unless key_len == 1
      raise ArgumentError, 'Duplicate Key, input tap key sig already provided.' if input.tap_key_sig
      raise ArgumentError, 'Invalid schnorr signature size for the type tap key sig' unless [64, 65].include?(value.bytesize)
      input.tap_key_sig = value.bth
    when PSBT_IN_TYPES[:tap_script_sig]
      raise ArgumentError, 'Duplicate Key, key for tap script sig value already provided.' if input.tap_script_sigs[key.bth]
      raise ArgumentError, 'Size of key was not the expected size for the type tap script sig' unless key.bytesize == (X_ONLY_PUBKEY_SIZE + 32)
      raise ArgumentError, 'Invalid schnorr signature size for the type tap script sig' unless [64, 65].include?(value.bytesize)
      input.tap_script_sigs[key.bth] = value.bth
    when PSBT_IN_TYPES[:tap_leaf_script]
      begin
        cb = Bitcoin::Taproot::ControlBlock.parse_from_payload(key)
        raise ArgumentError, 'Duplicate Key, key for tap leaf script value already provided.' if input.tap_leaf_scripts[cb]
        input.tap_leaf_scripts[cb] = value.bth
      rescue Bitcoin::Taproot::Error => e
        raise ArgumentError, e.message
      end
    when PSBT_IN_TYPES[:tap_bip32_derivation]
      raise ArgumentError, 'Duplicate Key, key for tap bip32 derivation value already provided.' if input.tap_bip32_derivations[key.bth]
      raise ArgumentError, 'Size of key was not the expected size for the type tap bip32 derivation' unless key.bytesize == X_ONLY_PUBKEY_SIZE
      input.tap_bip32_derivations[key.bth] = value.bth
    when PSBT_IN_TYPES[:tap_internal_key]
      raise ArgumentError, 'Size of key was not the expected size for the type tap internal key' unless key_len == 1
      raise ArgumentError, 'Duplicate Key, input tap internal key already provided.' if input.tap_internal_key
      raise ArgumentError, 'Invalid x-only public key size for the type tap internal key' unless value.bytesize == X_ONLY_PUBKEY_SIZE
      input.tap_internal_key = value.bth
    when PSBT_IN_TYPES[:tap_merkle_root]
      raise ArgumentError, 'Size of key was not the expected size for the type tap merkle root' unless key_len == 1
      raise ArgumentError, 'Duplicate Key, input tap merkle root already provided.' if input.tap_merkle_root
      raise ArgumentError, 'Invalid merkle root hash size for the type tap merkle root' unless value.bytesize == 32
      input.tap_merkle_root = value.bth
    else
      unknown_key = (Bitcoin.pack_var_int(key_type) + key).bth
      raise ArgumentError, 'Duplicate Key, key for unknown value already provided.' if input.unknowns[unknown_key]
      input.unknowns[unknown_key] = value
    end
  end
  raise ArgumentError, 'Separator is missing at the end of an input map.' unless found_sep
  input
end

Instance Method Details

#add_sig(pubkey, sig) ⇒ Object

add signature as partial sig.

Parameters:

  • pubkey (String) —

    a public key with hex format.

  • sig (String) —

    a signature.

Raises:

  • (ArgumentError) 


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# File 'lib/bitcoin/psbt/input.rb', line 234

def add_sig(pubkey, sig)
  raise ArgumentError, 'The sighash in signature is invalid.' if sighash_type && sig.unpack('C*')[-1] != sighash_type
  raise ArgumentError, 'Duplicate Key, input partial signature for pubkey already provided.' if partial_sigs[pubkey]
  partial_sigs[pubkey] = sig
end

#finalize! ⇒ Bitcoin::PSBT::Input

finalize input. TODO This feature is experimental and support only multisig.

Returns:



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# File 'lib/bitcoin/psbt/input.rb', line 265

def finalize!
  if non_witness_utxo
    self.final_script_sig = Bitcoin::Script.new << Bitcoin::Opcodes::OP_0 if redeem_script.multisig?
    partial_sigs.values.each {|sig|final_script_sig << sig}
    final_script_sig << redeem_script.to_hex
    self.partial_sigs = {}
    self.hd_key_paths = {}
    self.redeem_script = nil
    self.sighash_type = nil
  else
    if redeem_script
      self.final_script_sig = Bitcoin::Script.parse_from_payload(Bitcoin::Script.pack_pushdata(redeem_script.to_payload))
      self.redeem_script = nil
    end
    if witness_script
      self.final_script_witness = Bitcoin::ScriptWitness.new
      final_script_witness.stack << '' if witness_script.multisig?
      partial_sigs.values.each {|sig| final_script_witness.stack << sig}
      final_script_witness.stack << witness_script.to_payload
      self.witness_script = nil
    end
    self.sighash_type = nil
    self.partial_sigs = {}
    self.hd_key_paths = {}
  end
  self
end

#merge(psbi) ⇒ Bitcoin::PSBT::Input

merge two PSBT inputs to create one PSBT.

Parameters:

  • psbi (Bitcoin::PSBT::Input) —

    PSBT input to be combined which must have same property in PSBT Input.

Returns:

Raises:

  • (ArgumentError) 


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# File 'lib/bitcoin/psbt/input.rb', line 243

def merge(psbi)
  raise ArgumentError, 'The argument psbt must be an instance of Bitcoin::PSBT::Input.' unless psbi.is_a?(Bitcoin::PSBT::Input)
  raise ArgumentError, 'The Partially Signed Input\'s non_witness_utxo are different.' unless same_field?(non_witness_utxo, psbi.non_witness_utxo)
  raise ArgumentError, 'The Partially Signed Input\'s witness_utxo are different.' unless same_field?(witness_utxo, psbi.witness_utxo)
  raise ArgumentError, 'The Partially Signed Input\'s sighash_type are different.' if sighash_type && psbi.sighash_type && sighash_type != psbi.sighash_type
  raise ArgumentError, 'The Partially Signed Input\'s redeem_script are different.' unless same_field?(redeem_script, psbi.redeem_script)
  raise ArgumentError, 'The Partially Signed Input\'s witness_script are different.' unless same_field?(witness_script, psbi.witness_script)
  combined = Bitcoin::PSBT::Input.new(non_witness_utxo: non_witness_utxo, witness_utxo: witness_utxo)
  combined.unknowns = Hash[unknowns.merge(psbi.unknowns).sort]
  combined.redeem_script = redeem_script
  combined.witness_script = witness_script
  combined.sighash_type = sighash_type
  sigs = Hash[partial_sigs.merge(psbi.partial_sigs)]
  redeem_script.get_multisig_pubkeys.each{|pubkey|combined.partial_sigs[pubkey.bth] = sigs[pubkey.bth] if sigs[pubkey.bth]} if redeem_script&.multisig?
  witness_script.get_multisig_pubkeys.each{|pubkey|combined.partial_sigs[pubkey.bth] = sigs[pubkey.bth] if sigs[pubkey.bth]} if witness_script&.multisig?
  combined.hd_key_paths = hd_key_paths.merge(psbi.hd_key_paths)
  combined
end

#ready_to_sign?(utxo) ⇒ Boolean

Check whether the signer can sign this input.

Parameters:

Returns:

  • (Boolean) 


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# File 'lib/bitcoin/psbt/input.rb', line 220

def ready_to_sign?(utxo)
  return valid_witness_input? if witness_utxo
  valid_non_witness_input?(utxo) # non_witness_utxo
end

#signed? ⇒ Boolean

Checks whether a PSBTInput is already signed.

Returns:

  • (Boolean) —

    return true if already signed.



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# File 'lib/bitcoin/psbt/input.rb', line 227

def signed?
  final_script_sig || final_script_witness
end

#to_h ⇒ Object 



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# File 'lib/bitcoin/psbt/input.rb', line 293

def to_h
  h = {}
  h[:non_witness_utxo] = non_witness_utxo.to_h if non_witness_utxo
  h[:witness_utxo] = witness_utxo.to_h if witness_utxo
  h[:redeem_script] = redeem_script.to_h if redeem_script
  h[:witness_script] = witness_script.to_h if witness_script
  h[:final_script_sig] = final_script_sig.to_h if final_script_sig
  h[:final_script_witness] = final_script_witness.to_h if final_script_witness
  h[:bip32_derivs] = hd_key_paths.values.map(&:to_h) unless hd_key_paths.empty?
  h[:partial_signatures] = partial_sigs.map {|k, v| {"#{k}": v.bth}} unless partial_sigs.empty?
  h[:sighash_type] = sighash_type if sighash_type
  h[:ripemd160_preimages] = ripemd160_preimages.map {|k, v| {"#{k}": v}} unless ripemd160_preimages.empty?
  h[:sha256_preimages] = sha256_preimages.map {|k, v| {"#{k}": v}} unless sha256_preimages.empty?
  h[:hash160_preimages] = hash160_preimages.map {|k, v| {"#{k}": v}} unless hash160_preimages.empty?
  h[:hash256_preimages] = hash256_preimages.map {|k, v| {"#{k}": v}} unless hash256_preimages.empty?
  h[:proprietary] = proprietaries.map(&:to_h) unless proprietaries.empty?
  h[:tap_key_sig] = tap_key_sig if tap_key_sig
  h[:tap_script_sig] = tap_script_sigs.map {|k, v| {"#{k}": v}} unless tap_script_sigs.empty?
  h[:tap_leaf_script] = tap_leaf_scripts.map {|k, v| {"#{k}": v}} unless tap_leaf_scripts.empty?
  h[:tap_bip32_derivs] = tap_bip32_derivations.map{|k, v| {"#{k}": v}} unless tap_bip32_derivations.empty?
  h[:tap_internal_key] = tap_internal_key if tap_internal_key
  h[:tap_merkle_root] = tap_merkle_root if tap_merkle_root
  h[:unknown] = unknowns.map {|k, v| {"#{k}": v.bth}} unless unknowns.empty?
  h
end

#to_payload ⇒ Object 



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# File 'lib/bitcoin/psbt/input.rb', line 167

def to_payload
  payload = ''
  payload << PSBT.serialize_to_vector(PSBT_IN_TYPES[:non_witness_utxo], value:
      (witness_utxo && valid_witness_input?) ? non_witness_utxo.serialize_old_format : non_witness_utxo.to_payload) if non_witness_utxo
  payload << PSBT.serialize_to_vector(PSBT_IN_TYPES[:witness_utxo], value: witness_utxo.to_payload) if witness_utxo
  payload << partial_sigs.map{|k, v|PSBT.serialize_to_vector(PSBT_IN_TYPES[:partial_sig], key: k.htb, value: v)}.join
  payload << PSBT.serialize_to_vector(PSBT_IN_TYPES[:sighash], value: [sighash_type].pack('V')) if sighash_type
  payload << PSBT.serialize_to_vector(PSBT_IN_TYPES[:redeem_script], value: redeem_script.to_payload) if redeem_script
  payload << PSBT.serialize_to_vector(PSBT_IN_TYPES[:witness_script], value: witness_script.to_payload) if witness_script
  payload << hd_key_paths.values.map(&:to_payload).join
  payload << ripemd160_preimages.map{|k, v|PSBT.serialize_to_vector(PSBT_IN_TYPES[:ripemd160], key: k.htb, value: v.htb)}.join
  payload << sha256_preimages.map{|k, v|PSBT.serialize_to_vector(PSBT_IN_TYPES[:sha256], key: k.htb, value: v.htb)}.join
  payload << hash160_preimages.map{|k, v|PSBT.serialize_to_vector(PSBT_IN_TYPES[:hash160], key: k.htb, value: v.htb)}.join
  payload << hash256_preimages.map{|k, v|PSBT.serialize_to_vector(PSBT_IN_TYPES[:hash256], key: k.htb, value: v.htb)}.join
  payload << PSBT.serialize_to_vector(PSBT_IN_TYPES[:tap_key_sig], value: tap_key_sig.htb) if tap_key_sig
  payload << tap_script_sigs.map{|k, v| PSBT.serialize_to_vector(PSBT_IN_TYPES[:tap_script_sig], key: k.htb, value: v.htb)}.join
  payload << tap_leaf_scripts.map{|k, v| PSBT.serialize_to_vector(PSBT_IN_TYPES[:tap_leaf_script], key: k.to_payload, value: v.htb)}.join
  payload << tap_bip32_derivations.map{|k, v| PSBT.serialize_to_vector(PSBT_IN_TYPES[:tap_bip32_derivation], key: k.htb, value: v.htb)}.join
  payload << PSBT.serialize_to_vector(PSBT_IN_TYPES[:tap_internal_key], value: tap_internal_key.htb) if tap_internal_key
  payload << PSBT.serialize_to_vector(PSBT_IN_TYPES[:tap_merkle_root], value: tap_merkle_root.htb) if tap_merkle_root
  payload << PSBT.serialize_to_vector(PSBT_IN_TYPES[:script_sig], value: final_script_sig.to_payload) if final_script_sig
  payload << PSBT.serialize_to_vector(PSBT_IN_TYPES[:script_witness], value: final_script_witness.to_payload) if final_script_witness
  payload << proprietaries.map(&:to_payload).join
  payload << unknowns.map {|k,v|Bitcoin.pack_var_int(k.htb.bytesize) << k.htb << Bitcoin.pack_var_int(v.bytesize) << v}.join
  payload << PSBT_SEPARATOR.itb
  payload
end

#valid_non_witness_input?(utxo) ⇒ Boolean

Check whether input's scriptPubkey is correct witness.

Returns:

  • (Boolean) 


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# File 'lib/bitcoin/psbt/input.rb', line 213

def valid_non_witness_input?(utxo)
  utxo.script_pubkey.p2sh? && redeem_script.to_p2sh == utxo.script_pubkey
end

#valid_witness_input? ⇒ Boolean

Check whether input's scriptPubkey is correct witness.

Returns:

  • (Boolean) 


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# File 'lib/bitcoin/psbt/input.rb', line 197

def valid_witness_input?
  return false unless witness_utxo
  return true if witness_utxo.script_pubkey.p2wpkh? # P2WPKH
  # P2WSH. The scriptPubkey commits to the witness script directly, so a redeem script is not used.
  return true if witness_utxo.script_pubkey.p2wsh? && witness_script &&
    Bitcoin::Script.to_p2wsh(witness_script) == witness_utxo.script_pubkey
  # segwit nested in P2SH
  if witness_utxo.script_pubkey.p2sh? && redeem_script&.witness_program? && redeem_script.to_p2sh == witness_utxo.script_pubkey
    return true if redeem_script.p2wpkh?# nested p2wpkh
    return true if witness_script&.to_sha256 == redeem_script.witness_data[1].bth # nested p2wsh
  end
  false
end