Package org.bitcoinj.wallet

Class MarriedKeyChain

java.lang.Object

org.bitcoinj.wallet.DeterministicKeyChain

org.bitcoinj.wallet.MarriedKeyChain

All Implemented Interfaces:

EncryptableKeyChain, KeyChain

public class MarriedKeyChain
extends DeterministicKeyChain

A multi-signature keychain using synchronized HD keys (a.k.a HDM)

This keychain keeps track of following keychains that follow the account key of this keychain. You can get P2SH addresses to receive coins to from this chain. The threshold - sigsRequiredToSpend specifies how many signatures required to spend transactions for this married keychain. This value should not exceed total number of keys involved (one followed key plus number of following keys), otherwise IllegalArgumentException will be thrown.

IMPORTANT: As of Bitcoin Core 0.9 all bare (non-P2SH) multisig transactions which require more than 3 public keys are non-standard and such spends won't be processed by peers with default settings, essentially making such transactions almost nonspendable

This method will throw an IllegalStateException, if the keychain is already married or already has leaf keys issued.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	MarriedKeyChain.Builder<T extends MarriedKeyChain.Builder<T>>	Builds a MarriedKeyChain

Nested classes/interfaces inherited from interface org.bitcoinj.wallet.KeyChain

KeyChain.KeyPurpose

Field Summary

Fields inherited from class org.bitcoinj.wallet.DeterministicKeyChain

ACCOUNT_ONE_PATH, ACCOUNT_ZERO_PATH, BIP44_ACCOUNT_ZERO_PATH, DEFAULT_PASSPHRASE_FOR_MNEMONIC, EXTERNAL_SUBPATH, INTERNAL_SUBPATH, lock, lookaheadSize, lookaheadThreshold, sigsRequiredToSpend

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	MarriedKeyChain(DeterministicKey accountKey, Script.ScriptType outputScriptType)	This constructor is not stable across releases! If you need a stable API, use builder() to use a MarriedKeyChain.Builder.
protected	MarriedKeyChain(DeterministicSeed seed, KeyCrypter crypter, Script.ScriptType outputScriptType, List<ChildNumber> accountPath)	This constructor is not stable across releases! If you need a stable API, use builder() to use a MarriedKeyChain.Builder.

Method Summary

Modifier and Type	Method	Description
static MarriedKeyChain.Builder<?>	builder()
RedeemData	findRedeemDataByScriptHash(com.google.protobuf.ByteString bytes)	Returns the redeem script by its hash or null if this keychain did not generate the script.
protected void	formatAddresses(boolean includeLookahead, boolean includePrivateKeys, org.bouncycastle.crypto.params.KeyParameter aesKey, NetworkParameters params, StringBuilder builder)
Script	freshOutputScript(KeyChain.KeyPurpose purpose)	Create a new married key and return the matching output script
BloomFilter	getFilter(int size, double falsePositiveRate, long tweak)	Gets a bloom filter that contains all of the public keys from this chain, and which will provide the given false-positive rate if it has size elements.
RedeemData	getRedeemData(DeterministicKey followedKey)	Get the redeem data for a key in this married chain
boolean	isMarried()	Whether the keychain is married.
void	maybeLookAheadScripts()	Housekeeping call to call when lookahead might be needed.
int	numBloomFilterEntries()	Returns the number of elements this chain wishes to insert into the Bloom filter.
List<Protos.Key>	serializeToProtobuf()	Returns a list of keys serialized to the bitcoinj protobuf format.
void	setLookaheadSize(int lookaheadSize)	Sets a new lookahead size.

Methods inherited from class org.bitcoinj.wallet.DeterministicKeyChain

addEventListener, addEventListener, checkAESKey, checkPassword, findKeyFromPubHash, findKeyFromPubKey, fromProtobuf, getAccountPath, getEarliestKeyCreationTime, getIssuedExternalKeys, getIssuedInternalKeys, getIssuedReceiveKeys, getKey, getKeyByPath, getKeyByPath, getKeyByPath, getKeyCrypter, getKeyLookaheadEpoch, getKeys, getLeafKeys, getLookaheadSize, getLookaheadThreshold, getMnemonicCode, getOutputScriptType, getRootKey, getSeed, getSigsRequiredToSpend, getWatchingKey, hasKey, isFollowing, isWatching, makeKeyChainFromSeed, markKeyAsUsed, markPubHashAsUsed, markPubKeyAsUsed, maybeLookAhead, numKeys, numLeafKeysIssued, removeEventListener, serializeMyselfToProtobuf, setLookaheadThreshold, setSigsRequiredToSpend, toDecrypted, toDecrypted, toEncrypted, toEncrypted, toString, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

MarriedKeyChain

protected MarriedKeyChain(DeterministicKey accountKey,
 Script.ScriptType outputScriptType)

This constructor is not stable across releases! If you need a stable API, use builder() to use a MarriedKeyChain.Builder.

MarriedKeyChain

protected MarriedKeyChain(DeterministicSeed seed,
 KeyCrypter crypter,
 Script.ScriptType outputScriptType,
 List<ChildNumber> accountPath)

This constructor is not stable across releases! If you need a stable API, use builder() to use a MarriedKeyChain.Builder.

Method Details

builder

public static MarriedKeyChain.Builder<?> builder()

isMarried

public boolean isMarried()

Description copied from class: DeterministicKeyChain

Whether the keychain is married. A keychain is married when it vends P2SH addresses from multiple keychains in a multisig relationship.

Overrides:

isMarried in class DeterministicKeyChain

See Also:

• MarriedKeyChain

freshOutputScript

public Script freshOutputScript(KeyChain.KeyPurpose purpose)

Create a new married key and return the matching output script

Overrides:

freshOutputScript in class DeterministicKeyChain

getRedeemData

public RedeemData getRedeemData(DeterministicKey followedKey)

Get the redeem data for a key in this married chain

Overrides:

getRedeemData in class DeterministicKeyChain

setLookaheadSize

public void setLookaheadSize(int lookaheadSize)

Description copied from class: DeterministicKeyChain

Sets a new lookahead size. See DeterministicKeyChain.getLookaheadSize() for details on what this is. Setting a new size that's larger than the current size will return immediately and the new size will only take effect next time a fresh filter is requested (e.g. due to a new peer being connected). So you should set this before starting to sync the chain, if you want to modify it. If you haven't modified the lookahead threshold manually then it will be automatically set to be a third of the new size.

Overrides:

setLookaheadSize in class DeterministicKeyChain

serializeToProtobuf

public List<Protos.Key> serializeToProtobuf()

Description copied from interface: KeyChain

Returns a list of keys serialized to the bitcoinj protobuf format.

Specified by:

serializeToProtobuf in interface KeyChain

Overrides:

serializeToProtobuf in class DeterministicKeyChain

formatAddresses

protected void formatAddresses(boolean includeLookahead,
 boolean includePrivateKeys,
 @Nullable
 org.bouncycastle.crypto.params.KeyParameter aesKey,
 NetworkParameters params,
 StringBuilder builder)

Overrides:

formatAddresses in class DeterministicKeyChain

maybeLookAheadScripts

public void maybeLookAheadScripts()

Description copied from class: DeterministicKeyChain

Housekeeping call to call when lookahead might be needed. Normally called automatically by KeychainGroup.

Overrides:

maybeLookAheadScripts in class DeterministicKeyChain

findRedeemDataByScriptHash

@Nullable
public RedeemData findRedeemDataByScriptHash(com.google.protobuf.ByteString bytes)

Description copied from class: DeterministicKeyChain

Returns the redeem script by its hash or null if this keychain did not generate the script.

Overrides:

findRedeemDataByScriptHash in class DeterministicKeyChain

getFilter

public BloomFilter getFilter(int size,
 double falsePositiveRate,
 long tweak)

Description copied from interface: KeyChain

Gets a bloom filter that contains all of the public keys from this chain, and which will provide the given false-positive rate if it has size elements. Keep in mind that you will get 2 elements in the bloom filter for each key in the key chain, for the public key and the hash of the public key (address form). For this reason size should be at least 2x the result of KeyChain.numKeys().

This is used to generate a BloomFilter which can be BloomFilter.merge(BloomFilter)d with another. It could also be used if you have a specific target for the filter's size.

See the docs for BloomFilter(int, double, long) for a brief explanation of anonymity when using bloom filters, and for the meaning of these parameters.

Specified by:

getFilter in interface KeyChain

Overrides:

getFilter in class DeterministicKeyChain

numBloomFilterEntries

public int numBloomFilterEntries()

Description copied from interface: KeyChain

Returns the number of elements this chain wishes to insert into the Bloom filter. The size passed to KeyChain.getFilter(int, double, long) should be at least this large.

Specified by:

numBloomFilterEntries in interface KeyChain

Overrides:

numBloomFilterEntries in class DeterministicKeyChain