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Protocol Documentation - 0.12.1
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=====================================
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This document describes the protocol extensions for all additional functionality build into the Dash protocol. This doesn't include any of the Bitcoin protocol, which has been left intact in the Dash project. For more information about the core protocol, please see https://en.bitcoin.it/w/index.php?title#Protocol_documentation&action#edit
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## Common Structures
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### Simple types
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uint256 => char[32]
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CScript => uchar[]
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### COutPoint
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Bitcoin Outpoint https://bitcoin.org/en/glossary/outpoint
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 32 | hash | uint256 | Hash of transactional output which is being referenced
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| 4 | n | uint32_t | Index of transaction which is being referenced
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### CTxIn
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Bitcoin Input https://bitcoin.org/en/glossary/input
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 36 | prevout | [COutPoint](#coutpoint) | The previous output from an existing transaction, in the form of an unspent output
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| 1+ | script length | var_int | The length of the signature script
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| ? | script | CScript | The script which is validated for this input to be spent
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| 4 | nSequence | uint_32t | Transaction version as defined by the sender. Intended for "replacement" of transactions when information is updated before inclusion into a block.
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### CTxOut
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Bitcoin Output https://bitcoin.org/en/glossary/output
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 8 | nValue | int64_t | Transfered value
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| ? | scriptPubKey | CScript | The script for indicating what conditions must be fulfilled for this output to be further spent
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### CTransaction
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 4 | nVersion | int32_t | Transaction data format version
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| 1+ | tx_in count | var_int | Number of Transaction inputs
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| 41+ | vin | [CTxIn](#ctxin)[] | A list of 1 or more transaction inputs
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| 1+ | tx_out count | var_int | Number of Transaction outputs
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| 9+ | vout | [CTxOut](#ctxout)[] | A list of 1 or more transaction outputs
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| 4 | nLockTime | uint32_t | The block number or timestamp at which this transaction is unlocked
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### CPubKey
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Bitcoin Public Key https://bitcoin.org/en/glossary/public-key
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 33-65 | vch | char[] | The public portion of a keypair which can be used to verify signatures made with the private portion of the keypair.
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### CService
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 16 | IP | CNetAddr | IP Address
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| 2 | Port | uint16 | IP Port
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## Message Types
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### DSTX - "dstx"
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CDarksendBroadcastTx
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Masternodes can broadcast subsidised transactions without fees for the sake of security in mixing. This is done via the DSTX message.
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| # | tx | [CTransaction](#ctransaction) | The transaction
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| 36 | masternodeOutpoint | [COutPoint](#coutpoint) | The unspent output of the masternode which is signing the message
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| 71-73 | vchSig | char[] | Signature of this message by masternode (verifiable via pubKeyMasternode)
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| 8 | sigTime | int64_t | Time this message was signed
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### DSSTATUSUPDATE - "dssu"
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Mixing pool status update
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 4 | nMsgSessionID | int | Session ID
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| 4 | nMsgState | int | Current state of mixing process
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| 4 | nMsgEntriesCount | int | Number of entries in the mixing pool
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| 4 | nMsgStatusUpdate | int | Update state and/or signal if entry was accepted or not
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| 4 | nMsgMessageID | int | ID of the typical masternode reply message
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### DSQUEUE - "dsq"
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CDarksendQueue
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Asks users to sign final mixing tx message.
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 4 | nDenom | int | Which denomination is allowed in this mixing session
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| 36 | masternodeOutpoint | [COutPoint](#coutpoint) | The unspent output of the masternode which is hosting this session
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| 8 | nTime | int64_t | the time this DSQ was created
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| 1 | fReady | bool | if the mixing pool is ready to be executed
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| 66 | vchSig | char[] | Signature of this message by masternode (verifiable via pubKeyMasternode)
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### DSACCEPT - "dsa"
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Response to DSQ message which allows the user to join a mixing pool
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 4 | nDenom | int | denomination that will be exclusively used when submitting inputs into the pool
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| 216+ | txCollateral | [CTransaction](#ctransaction) | collateral tx that will be charged if this client acts maliciously
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### DSVIN - "dsi"
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CDarkSendEntry
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When queue is ready user is expected to send his entry to start actual mixing
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| ? | vecTxDSIn | CTxDSIn[] | vector of users inputs (CTxDSIn serialization is equal to [CTxIn](#ctxin) serialization)
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| 216+ | txCollateral | [CTransaction](#ctransaction) | Collateral transaction which is used to prevent misbehavior and also to charge fees randomly
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| ? | vecTxOut | [CTxOut](#ctxout)[] | vector of user outputs
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### DSSIGNFINALTX - "dss"
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User's signed inputs for a group transaction in a mixing session
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| # | inputs | [CTxIn](#ctxin)[] | signed inputs for mixing session
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### TXLOCKREQUEST - "ix"
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CTxLockRequest
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Transaction Lock Request, serialization is the same as for [CTransaction](#ctransaction).
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### TXLOCKVOTE - "txlvote"
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CTxLockVote
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Transaction Lock Vote
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 32 | txHash | uint256 | txid of the transaction to lock
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| 36 | outpoint | [COutPoint](#coutpoint) | The utxo to lock in this transaction
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| 36 | outpointMasternode | [COutPoint](#coutpoint) | The utxo of the masternode which is signing the vote
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| 71-73 | vchMasternodeSignature | char[] | Signature of this message by masternode (verifiable via pubKeyMasternode)
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### MNGOVERNANCEOBJECT - "govobj"
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Governance Object
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A proposal, contract or setting.
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 32 | nHashParent | uint256 | Parent object, 0 is root
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| 4 | nRevision | int | Object revision in the system
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| 8 | nTime | int64_t | Time which this object was created
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| 32 | nCollateralHash | uint256 | Hash of the collateral fee transaction
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| 0-16384 | strData | string | Data field - can be used for anything
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| 4 | nObjectType | int | ????
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| 36 | masternodeOutpoint | [COutPoint](#coutpoint) | The unspent output of the masternode which is signing this object
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| 66* | vchSig | char[] | Signature of the masternode (unclear if 66 is the correct size, but this is what it appears to be in most cases)
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### MNGOVERNANCEOBJECTVOTE - "govobjvote"
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Governance Vote
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Masternodes use governance voting in response to new proposals, contracts, settings or finalized budgets.
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 36 | masternodeOutpoint | [COutPoint](#coutpoint) | The unspent output of the masternode which is voting
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| 32 | nParentHash | uint256 | Object which we're voting on (proposal, contract, setting or final budget)
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| 4 | nVoteOutcome | int | ???
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| 4 | nVoteSignal | int | ???
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| 8 | nTime | int64_t | Time which the vote was created
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| 66* | vchSig | char[] | Signature of the masternode (unclear if 66 is the correct size, but this is what it appears to be in most cases)
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### SPORK - "spork"
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Spork
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Spork
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 4 | nSporkID | int | |
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| 8 | nValue | int64_t | |
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| 8 | nTimeSigned | int64_t | |
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| 66* | vchSig | char[] | Unclear if 66 is the correct size, but this is what it appears to be in most cases |
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#### Defined Sporks (per src/sporks.h)
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| Spork ID | Number | Name | Description |
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| ---------- | ---------- | ----------- | ----------- |
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| 10001 | 2 | INSTANTSEND_ENABLED | Turns on and off InstantSend network wide
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| 10002 | 3 | INSTANTSEND_BLOCK_FILTERING | Turns on and off InstantSend block filtering
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| 10004 | 5 | INSTANTSEND_MAX_VALUE | Controls the max value for an InstantSend transaction (currently 2000 dash)
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| 10005 | 6 | NEW_SIGS | Turns on and off new signature format for Dash-specific messages
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| 10007 | 8 | MASTERNODE_PAYMENT_ENFORCEMENT | Requires masternodes to be paid by miners when blocks are processed
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| 10008 | 9 | SUPERBLOCKS_ENABLED | Superblocks are enabled (the 10% comes to fund the dash treasury)
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| 10009 | 10 | MASTERNODE_PAY_UPDATED_NODES | Only current protocol version masternode's will be paid (not older nodes)
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| 10011 | 12 | RECONSIDER_BLOCKS | |
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| 10012 | 13 | OLD_SUPERBLOCK_FLAG | |
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| 10013 | 14 | REQUIRE_SENTINEL_FLAG | Only masternode's running sentinel will be paid
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## Undocumented messages
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### DSFINALTX - "dsf"
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Darksend Final Transaction
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 4 | nSessionID | int | |
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| # | txFinal | [CTransaction](#ctransaction) | Final mixing transaction
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### DSCOMPLETE - "dsc"
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Darksend Complete
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 4 | nSessionID | int | |
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| 4 | nMessageID | int | |
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### MNGOVERNANCESYNC - "govsync"
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Governance Sync
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 32 | nHash | uint256 | |
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| # | filter | CBloomFilter | |
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### SYNCSTATUSCOUNT - "ssc"
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Sync Status Count
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| Field Size | Field Name | Data type | Description |
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| ---------- | ----------- | --------- | ---------- |
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| 4 | nItemID | int | Masternode Sync Item ID
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| 4 | nCount | int | Masternode Sync Count
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#### Defined Sync Item IDs (per src/masternode-sync.h)
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| Item ID | Name | Description |
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| ---------- | ---------- | ----------- |
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| 4 | MASTERNODE_SYNC_GOVERNANCE | |
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| 10 | MASTERNODE_SYNC_GOVOBJ | |
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| 11 | MASTERNODE_SYNC_GOVOBJ_VOTE | |
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@ -26,6 +26,8 @@ Drag Dash-Qt to your applications folder, and then run Dash-Qt.
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* See the [Dash documentation](https://docs.dash.org)
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for help and more information.
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* See the [Dash Developer Documentation](https://dash-docs.github.io/)
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for technical specifications and implementation details.
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* Ask for help on [Dash Nation Discord](http://dashchat.org)
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* Ask for help on the [Dash Forum](https://dash.org/forum)
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