public class UTXOsMessage extends Message
Message representing a list of unspent transaction outputs ("utxos"), returned in response to sending a
GetUTXOsMessage ("getutxos"). Note that both this message and the query that generates it are not
supported by Bitcoin Core. An implementation is available in Bitcoin XT,
a patch set on top of Core. Thus if you want to use it, you must find some XT peers to connect to. This can be done
using a HttpDiscovery class combined with an HTTP/Cartographer seed.
The getutxos/utxos protocol is defined in BIP 65. In that document you can find a discussion of the security of this protocol (briefly, there is none). Because the data found in this message is not authenticated it should be used carefully. Places where it can be useful are if you're querying your own trusted node, if you're comparing answers from multiple nodes simultaneously and don't believe there is a MITM on your connection, or if you're only using the returned data as a UI hint and it's OK if the data is occasionally wrong. Bear in mind that the answer can be wrong even in the absence of malicious intent just through the nature of querying an ever changing data source: the UTXO set may be updated by a new transaction immediately after this message is returned.
Instances of this class are not safe for use by multiple threads.
| Modifier and Type | Field and Description |
|---|---|
static long |
MEMPOOL_HEIGHT
This is a special sentinel value that can appear in the heights field if the given tx is in the mempool.
|
cursor, length, MAX_SIZE, offset, params, payload, protocolVersion, recached, serializer, UNKNOWN_LENGTH| Constructor and Description |
|---|
UTXOsMessage(NetworkParameters params,
byte[] payloadBytes) |
UTXOsMessage(NetworkParameters params,
java.util.List<TransactionOutput> outputs,
long[] heights,
Sha256Hash chainHead,
long height)
Provide an array of output objects, with nulls indicating that the output was missing.
|
| Modifier and Type | Method and Description |
|---|---|
protected void |
bitcoinSerializeToStream(java.io.OutputStream stream)
Serializes this message to the provided stream.
|
boolean |
equals(java.lang.Object o) |
long[] |
getHeights()
Returns the block heights of each output returned in getOutputs(), or MEMPOOL_HEIGHT if not confirmed yet.
|
byte[] |
getHitMap()
Returns a bit map indicating which of the queried outputs were found in the UTXO set.
|
java.util.List<TransactionOutput> |
getOutputs()
Returns the list of outputs that matched the query.
|
int |
hashCode() |
protected void |
parse() |
java.lang.String |
toString() |
adjustLength, bitcoinSerialize, bitcoinSerialize, getHash, getMessageSize, getParams, hasMoreBytes, isCached, isRecached, readByteArray, readBytes, readHash, readInt64, readStr, readUint32, readUint64, readVarInt, readVarInt, unCache, unsafeBitcoinSerializepublic static long MEMPOOL_HEIGHT
public UTXOsMessage(NetworkParameters params, byte[] payloadBytes)
public UTXOsMessage(NetworkParameters params, java.util.List<TransactionOutput> outputs, long[] heights, Sha256Hash chainHead, long height)
protected void bitcoinSerializeToStream(java.io.OutputStream stream)
throws java.io.IOException
MessagebitcoinSerializeToStream in class Messagejava.io.IOExceptionprotected void parse()
throws ProtocolException
parse in class MessageProtocolExceptionpublic byte[] getHitMap()
public java.util.List<TransactionOutput> getOutputs()
public long[] getHeights()
public java.lang.String toString()
toString in class java.lang.Objectpublic boolean equals(java.lang.Object o)
equals in class java.lang.Objectpublic int hashCode()
hashCode in class java.lang.Object