btcsuite/btcd

Protocol and network related changes:

• Add a new checkpoint at block height 382320 (#555)
• Implement BIP0065 which includes support for version 4 blocks, a new consensus opcode (OP_CHECKLOCKTIMEVERIFY) that enforces transaction lock times, and a double-threshold switchover mechanism (#535, #459, #455)
• Implement BIP0111 which provides a new bloom filter service flag and hence provides support for protocol version 70011 (#499)
• Add a new parameter --nopeerbloomfilters to allow disabling bloom filter support (#499)
• Reject non-canonically encoded variable length integers (#507)
• Add mainnet peer discovery DNS seed (seed.bitcoin.jonasschnelli.ch) (#496)
• Correct reconnect handling for persistent peers (#463, #464)
• Ignore requests for block headers if not fully synced (#444)
• Add CLI support for specifying the zone id on IPv6 addresses (#538)
• Fix a couple of issue where the initial block sync could stall (#518, #229, #486)
• Fix an issue which prevented the --onion option from working as intended (#446)

Transaction relay (memory pool) changes:

• Require transactions to only include signatures encoded with the canonical 'low-s' encoding (#512)
• Add a new parameter --minrelaytxfee to allow the minimum transaction fee in BTC/kB to be overridden (#520)
• Retain memory pool transactions when they redeem another one that is removed when a block is accepted (#539)
• Do not send reject messages for a transaction if it is valid but causes an orphan transaction which depends on it to be determined as invalid (#546)
• Refrain from attempting to add orphans to the memory pool multiple times when the transaction they redeem is added (#551)
• Modify minimum transaction fee calculations to scale based on bytes instead of full kilobyte boundaries (#521, #537)

Implement signature cache:

• Provides a limited memory cache of validated signatures which is a huge optimization when verifying blocks for transactions that are already in the memory pool (#506)
• Add a new parameter --sigcachemaxsize which allows the size of the new cache to be manually changed if desired (#506)

Mining support changes:

• Notify getblocktemplate long polling clients when a block is pushed via submitblock (#488)
• Speed up getblocktemplate by making use of the new signature cache (#506)

RPC changes:

• Implement getmempoolinfo command (#453)
• Implement getblockheader command (#461)
• Modify createrawtransaction command to accept a new optional parameter locktime (#529)
• Modify listunspent result to include the spendable field (#440)
• Modify getinfo command to include errors field (#511)
• Add timestamps to blockconnected and blockdisconnected notifications (#450)
• Several modifications to searchrawtranscations:
  • Accept a new optional parameter vinextra which causes the results to include information about the outputs referenced by a transaction inputs (#485, #487)
  • Skip entries in the mempool too (#495)
  • Accept a new optional parameter reverse to return the results in reverse order (most recent to oldest) (#497)
  • Accept a new optional parameter filteraddrs which causes the results to only include inputs and outputs which involve the provided addresses (#516)
• Change the notification order to notify clients about mined transactions (recvtx, redeemingtx) before the blockconnected notification (#449)
• Update verifymessage RPC to use the standard algorithm so it is compatible with other implementations (#515)
• Improve ping statistics by pinging on an interval (#517)

Websocket changes:

• Implement session command which returns a per-session unique id (#500, #503)

btcctl utility changes:

• Add getmempoolinfo command (#453)
• Add getblockheader command (#461)
• Add getwalletinfo command (#471)

Notable developer-related package changes:

• Introduce a new peer package which acts a common base for creating and concurrently managing bitcoin network peers (#445)
  • Various cleanup of the new peer package (#528, #531, #524, #534, #549)
• Blocks heights now consistently use int32 everywhere (#481)
• The BlockHeader type in the wire package now provides the BtcDecode and BtcEncode methods (#467)
• Update wire package to recognize BIP0064 (getutxo) service bit (#489)
• Export LockTimeThreshold constant from txscript package (#454)
• Export MaxDataCarrierSize constant from txscript package (#466)
• Provide new IsUnspendable function from the txscript package (#478)
• Export variable length string functions from the wire package (#514)
• Export DNS Seeds for each network from the chaincfg package (#544)
• Preliminary work towards separating the memory pool into a separate package (#525, #548)

Misc changes:

• Various documentation updates (#442, #462, #465, #460, #470, #473, #505, #530, #545)
• Add installation instructions for gentoo (#542)
• Ensure an error is shown if OS limits can't be set at startup (#498)
• Tighten the standardness checks for multisig scripts (#526)
• Test coverage improvement (#468, #494, #527, #543, #550)
• Several optimizations (#457, #474, #475, #476, #508, #509)
• Minor code cleanup and refactoring (#472, #479, #482, #519, #540)

Contributors (alphabetical order):

• Ben Echols
• Bruno Clermont
• danda
• Daniel Krawisz
• Dario Nieuwenhuis
• Dave Collins
• David Hill
• Javed Khan
• Jonathan Gillham
• Joseph Becher
• Josh Rickmar
• Justus Ranvier
• Mawuli Adzoe
• Olaoluwa Osuntokun
• Rune T. Aune

MSI Checksums:

SHA256(btcd_standalone_0.12.0-beta_x64.msi)= 024274804600e0a37ba5e7ac5abc9fdfe91b071e92c9251f38f01bec6785fb77
SHA256(btcd_standalone_0.12.0-beta_x86.msi)= b122bb7cd29e0e5e32ada279a12eeef3d44d58f3bb377ea7ce8b1f42ca0bdba3
SHA512(btcd_standalone_0.12.0-beta_x64.msi)= 725266286cb5ba62d435b992353b83aef4a3586e5ee9aeecfcc90b8026225f12c081471d56fb0f02d92ca5d92965eb99429209125b108c47599c8b1b619fb852
SHA512(btcd_standalone_0.12.0-beta_x86.msi)= d2849eef7cce9ec88a9538940c3ebfb08c2ecbf4be88f4029552bac5db2cdc203e31e8a401cf54dab694d4f49dd640bc8bb962cb5d70227bde91d785364823cb

Protocol and network related changes:

• Use correct sub-command in reject message for rejected transactions (#436, #437)
• Add a new parameter --torisolation which forces new circuits for each connection when using tor (#430)

Transaction relay (memory pool) changes:

• Reduce the default number max number of allowed orphan transactions to 1000 (#419)
• Add a new parameter --maxorphantx which allows the maximum number of orphan transactions stored in the mempool to be specified (#419)

RPC changes:

• Modify listtransactions result to include the involveswatchonly and vout fields (#427)
• Update getrawtransaction result to omit the confirmations field when it is 0 (#420, #422)
• Update signrawtransaction result to include errors (#423)

btcctl utility changes:

• Add gettxoutproof command (#428)
• Add verifytxoutproof command (#428)

Notable developer-related package changes:

• The btcec package now provides the ability to perform ECDH encryption and decryption (#375)
• The block and header validation in the blockchain package has been split to help pave the way toward concurrent downloads (#386)

Misc changes:

• Minor peer optimization (#433)

Contributors (alphabetical order):

• Dave Collins
• David Hill
• Federico Bond
• Ishbir Singh
• Josh Rickmar

MSI Checksums:

SHA256(btcd_standalone_0.11.1-beta_x64.msi)= 14d5a2aaa3cbbcd37a706c9cd8918093d93f9cc826f0eed3af213c673089f126
SHA256(btcd_standalone_0.11.1-beta_x86.msi)= eb6e558a81e406d4497de1ad5ca94b12d57be62745fdcc1669b254716f5aa1c0
SHA512(btcd_standalone_0.11.1-beta_x64.msi)= 2519b2c8e2990e9cdc4ae36f236ed7544848890fd4f8b0ff4e1a7596099806feb39aa47c4e10c231c51f115daf12e4484a6a85958877589e792bb95dd2519781
SHA512(btcd_standalone_0.11.1-beta_x86.msi)= 74d52f60feef618055556a779b38f0773df8e997e1c691db6559dea28f5e0784f8f362cf3f37dc7cd91f22cc7ae9e17940955da8b81d903910e06d3f9ae8523c

Protocol and network related changes:

• IMPORTANT: Update is required due to the following point
• Correct a few corner cases in script handling which could result in forking from the network on non-standard transactions (#425)
• Add a new checkpoint at block height 352940 (#418)
• Optimized script execution (#395, #400, #404, #409)
• Fix a case that could lead stalled syncs (#138, #296)

Network address manager changes:

• Implement eclipse attack countermeasures as proposed in http://cs-people.bu.edu/heilman/eclipse (#370, #373)

Optional address indexing changes:

• Fix an issue where a reorg could cause an orderly shutdown when the address index is active (#340, #357)

Transaction relay (memory pool) changes:

• Increase maximum allowed space for nulldata transactions to 80 bytes (#331)
• Implement support for the following rules specified by BIP0062:
  • The S value in ECDSA signature must be at most half the curve order (rule 5) (#349)
  • Script execution must result in a single non-zero value on the stack (rule 6) (#347)
  • NOTE: All 7 rules of BIP0062 are now implemented
• Use network adjusted time in finalized transaction checks to improve consistency across nodes (#332)
• Process orphan transactions on acceptance of new transactions (#345)

RPC changes:

• Add support for a limited RPC user which is not allowed admin level operations on the server (#363)
• Implement node command for more unified control over connected peers (#79, #341)
• Implement generate command for regtest/simnet to support deterministically mining a specified number of blocks
  (#362, #407)
• Update searchrawtransactions to return the matching transactions in order (#354)
• Correct an issue with searchrawtransactions where it could return duplicates (#346, #354)
• Increase precision of difficulty field in getblock result to 8 (#414, #415)
• Omit nextblockhash field from getblock result when it is empty (#416, #417)
• Add id and timeoffset fields to getpeerinfo result (#335)

Websocket changes:

• Implement new commands stopnotifyspent, stopnotifyreceived, stopnotifyblocks, and stopnotifynewtransactions to allow clients to cancel notification registrations (#122, #342)

btcctl utility changes:

• A single dash can now be used as an argument to cause that argument to be read from stdin (#348)
• Add generate command

Notable developer-related package changes:

• The new version 2 btcjson package has now replaced the deprecated version 1 package (#368)
• The btcec package now performs all signing using RFC6979 deterministic signatures (#358, #360)
• The txscript package has been significantly cleaned up and had a few API changes (#387, #388, #389, #390, #391, #392, #393, #395, #396, #400, #403, #404, #405, #406, #408, #409, #410, #412)
• A new PkScriptLocs function has been added to the wire package MsgTx type which provides callers that deal with scripts optimization opportunities (#343)

Misc changes:

• Minor wire hashing optimizations (#366, #367)
• Other minor internal optimizations

Contributors (alphabetical order):

• Alex Akselrod
• Arne Brutschy
• Chris Jepson
• Daniel Krawisz
• Dave Collins
• David Hill
• Jimmy Song
• Jonas Nick
• Josh Rickmar
• Olaoluwa Osuntokun
• Oleg Andreev

MSI Checksums:

SHA256(btcd_standalone_0.11.0-beta_x64.msi)= d2023ce1243b52afc12a6c84f8d176a7b5d699ef551aafcdd248abd31b3c635d
SHA256(btcd_standalone_0.11.0-beta_x86.msi)= 22e63783cb44e909190ff91cef05c7aa4267c0d9d758aaf459bd77ef3053b810
SHA512(btcd_standalone_0.11.0-beta_x64.msi)= 8ed8e7cf65c70b5981ef58f6ff3b63beab611c9cd3b6dac70e6cb940b3788b44dcd530251de2be4410371adab224e17386aefe38bd4b031dce28ecbe2b26ea78
SHA512(btcd_standalone_0.11.0-beta_x86.msi)= 878aa38fb29ea809ab341a554ad9ab646cc7b4e260e7d09fa7eb1c10af2bb60ed23eca8d6ae9ff0f61f8ea0a54ed143523069a0b9786268482284b9537ef0307

Protocol and network related changes:

• Add a new checkpoint at block height 343185
• Implement BIP066 which includes support for version 3 blocks, a new consensus rule which prevents non-DER encoded signatures, and a double-threshold switchover mechanism
• Rather than announcing all known addresses on getaddr requests which can possibly result in multiple messages, randomize the results and limit them to the max allowed by a single message (1000 addresses)
• Add more reserved IP spaces to the address manager

Transaction relay (memory pool) changes:

• Make transactions which contain reserved opcodes nonstandard
• No longer accept or relay free and low-fee transactions that have insufficient priority to be mined in the next block
• Implement support for the following rules specified by BIP0062:
  • ECDSA signature must use strict DER encoding (rule 1)
  • The signature script must only contain push operations (rule 2)
  • All push operations must use the smallest possible encoding (rule 3)
  • All stack values interpreted as a number must be encoding using the shortest possible form (rule 4)
  • NOTE: Rule 1 was already enforced, however the entire script now evaluates to false rather than only the signature verification as required by BIP0062
• Allow transactions with nulldata transaction outputs to be treated as standard

Mining support changes:

• Modify the getblocktemplate RPC to generate and return block templates for version 3 blocks which are compatible with BIP0066
• Allow getblocktemplate to serve blocks when the current time is less than the minimum allowed time for a generated block template (#209)

Crypto changes:

• Optimize scalar multiplication by the base point by using a pre-computed table which results in approximately a 35% speedup (btcsuite/btcec#2)
• Optimize general scalar multiplication by using the secp256k1 endomorphism which results in approximately a 17-20% speedup (btcsuite/btcec#1)
• Optimize general scalar multiplication by using non-adjacent form which results in approximately an additional 8% speedup (btcsuite/btcec#3)

Implement optional address indexing:

• Add a new parameter --addrindex which will enable the creation of an address index which can be queried to determine all transactions which involve a given address (#190)
• Add a new logging subsystem for address index related operations
• Support new searchrawtransactions RPC (#185)

RPC changes:

• Require TLS version 1.2 as the minimum version for all TLS connections
• Provide support for disabling TLS when only listening on localhost (#192)
• Modify help output for all commands to provide much more consistent and detailed information
• Correct case in getrawtransaction which would refuse to serve certain transactions with invalid scripts (#210)
• Correct error handling in the getrawtransaction RPC which could lead to a crash in rare cases (#196)
• Update getinfo RPC to include the appropriate 'timeoffset' calculated from the median network time
• Modify listreceivedbyaddress result type to include txids field so it is compatible
• Add 'iswatchonly' field to validateaddress result
• Add 'startingpriority' and 'currentpriority' fields to getrawmempool (#178)
• Don't omit the 'confirmations' field from getrawtransaction when it is zero

Websocket changes:

• Modify the behavior of the rescan command to automatically register for notifications about transactions paying to rescanned addresses or spending outputs from the final rescan utxo set when the rescan is through the best block in the chain

btcctl utility changes:

• Make the list of commands available via the -l option rather than dumping the entire list on usage errors
• Alphabetize and categorize the list of commands by chain and wallet
• Make the help option only show the help options instead of also dumping all of the commands
• Make the usage syntax much more consistent and correct a few cases of misnamed fields (#305)
• Improve usage errors to show the specific parameter number, reason, and error code
• Only show the usage for specific command is shown when a valid command is provided with invalid parameters
• Add support for a SOCK5 proxy
• Modify output for integer fields (such as timestamps) to display normally instead in scientific notation
• Add invalidateblock command
• Add reconsiderblock command
• Add createnewaccount command
• Add renameaccount command
• Add searchrawtransactions command
• Add importaddress command
• Add importpubkey command

showblock utility changes:

• Remove utility in favor of the RPC getblock method

Notable developer-related package changes:

• Many of the core packages have been relocated into the btcd repository
  (#214)
• A new version of the btcjson package that has been completely redesigned from the ground up based based upon how the project has evolved and lessons learned while using it since it was first written is now available in the btcjson/v2/btcjson directory
  • This will ultimately replace the current version so anyone making use of this package will need to update their code accordingly
• The btcec package now provides better facilities for working directly with its public and private keys without having to mix elements from the ecdsa package
• Update the script builder to ensure all rules specified by BIP0062 are adhered to when creating scripts
• The blockchain package now provides a MedianTimeSource interface and concrete implementation for providing time samples from remote peers and using that data to calculate an offset against the local time

Misc changes:

• Fix a slow memory leak due to tickers not being stopped (#189)
• Fix an issue where a mix of orphans and SPV clients could trigger a condition where peers would no longer be served (#231)
• The RPC username and password can now contain symbols which previously conflicted with special symbols used in URLs
• Improve handling of obtaining random nonces to prevent cases where it could error when not enough entropy was available
• Improve handling of home directory creation errors such as in the case of unmounted symlinks (#193)
• Improve the error reporting for rejected transactions to include the inputs which are missing and/or being double spent
• Update sample config file with new options and correct a comment regarding the fact the RPC server only listens on localhost by default (#218)
• Update the continuous integration builds to run several tools which help keep code quality high
• Significant amount of internal code cleanup and improvements
• Other minor internal optimizations

Code Contributors (alphabetical order):
Beldur
Ben Holden-Crowther
Dave Collins
David Evans
David Hill
Guilherme Salgado
Javed Khan
Jimmy Song
John C. Vernaleo
Jonathan Gillham
Josh Rickmar
Michael Ford
Michail Kargakis
kac
Olaoluwa Osuntokun

Protocol and network related changes:

• Add a new checkpoint at block height 319400
• Add support for BIP0037 bloom filters (#132)
• Implement BIP0061 reject handling and hence support for protocol version 70002 (#133)
• Add testnet DNS seeds for peer discovery (testnet-seed.alexykot.me and testnet-seed.bitcoin.schildbach.de)
• Add mainnet DNS seed for peer discovery (seeds.bitcoin.open-nodes.org)
• Make multisig transactions with non-null dummy data nonstandard (#131)
• Make transactions with an excessive number of signature operations nonstandard
• Perform initial DNS lookups concurrently which allows connections more quickly
• Improve the address manager to significantly reduce memory usage and add tests
• Remove orphan transactions when they appear in a mined block (#166)
• Apply incremental back off on connection retries for persistent peers that give invalid replies to mirror the logic used for failed connections (#103)
• Correct rate-limiting of free and low-fee transactions

Mining support changes:

• Implement getblocktemplate RPC with the following support: (#124)
  • BIP0022 Non-Optional Sections
  • BIP0022 Long Polling
  • BIP0023 Basic Pool Extensions
  • BIP0023 Mutation coinbase/append
  • BIP0023 Mutations time, time/increment, and time/decrement
  • BIP0023 Mutation transactions/add
  • BIP0023 Mutations prevblock, coinbase, and generation
  • BIP0023 Block Proposals
• Implement built-in concurrent CPU miner (#137)
  • NOTE: CPU mining on mainnet is pointless as the difficulty is far too high. This has been provided for testing purposes such as for the new simulation test network
  • Add --generate flag to enable CPU mining
  • Deprecate the --getworkkey flag in favor of --miningaddr which specifies which addresses generated blocks will choose from to pay the subsidy to

RPC changes:

• Implement gettxout command (#141)
• Implement validateaddress command
• Implement verifymessage command
• Mark getunconfirmedbalance RPC as wallet-only
• Mark getwalletinfo RPC as wallet-only
• Update getgenerate, setgenerate, gethashespersec, and getmininginfo to return the appropriate information about new CPU mining status
• Modify getpeerinfo pingtime and pingwait field types to float64 so they are compatible
• Improve disconnect handling for normal HTTP clients
• Make error code returns for invalid hex more consistent

Websocket changes:

• Switch to a new more efficient websocket package (#134)
• Add rescanfinished notification
• Modify the rescanprogress notification to include block hash as well as height (#151)

btcctl utility changes:

• Accept --simnet flag which automatically selects the appropriate port and TLS certificates needed to communicate with btcd and btcwallet on the simulation test network
• Fix createrawtransaction command to send amounts denominated in BTC
• Add estimatefee command
• Add estimatepriority command
• Add getmininginfo command
• Add getnetworkinfo command
• Add gettxout command
• Add lockunspent command
• Add signrawtransaction command

addblock utility changes:

• Accept --simnet flag which automatically selects the appropriate port and TLS certificates needed to communicate with btcd and btcwallet on the simulation test network

Notable developer-related package changes:

• Provide a new bloom package in btcutil which allows creating and working with BIP0037 bloom filters
• Provide a new hdkeychain package in btcutil which allows working with BIP0032 hierarchical deterministic key chains
• Introduce a new btcnet package which houses network parameters
• Provide new simnet network (--simnet) which is useful for private simulation testing
• Enforce low S values in serialized signatures as detailed in BIP0062
• Return errors from all methods on the btcdb.Db interface (btcsuite/btcdb#5)
• Allow behavior flags to alter btcchain.ProcessBlock (btcsuite/btcchain#5)
• Provide a new SerializeSize API for blocks (btcsuite/btcwire#19)
• Several of the core packages now work with Google App Engine

Misc changes:

• Correct an issue where the database could corrupt under certain circumstances which would require a new chain download
• Slightly optimize deserialization
• Use the correct IP block for he.net
• Fix an issue where it was possible the block manager could hang on shutdown
• Update sample config file so the comments are on a separate line rather than the end of a line so they are not interpreted as settings (#135)
• Correct an issue where getdata requests were not being properly throttled which could lead to larger than necessary memory usage
• Always show help when given the help flag even when the config file contains invalid entries
• General code cleanup and minor optimizations

Code Contributors (alphabetical order):

Dale Rahn
Dave Collins
David Hill
Geert Johan
Glenn Lewis
Guilherme Salgado
Javed Khan
John C. Vernaleo
Jonathan Gillham
Josh Rickmar
Marcell Ortutay
Marco Peereboom
Michalis Kargakis
Nicola Larosa
Olaoluwa Osuntokun
Owain G. Ainsworth
Tomás Senart
Yurii Rashkovskii

• Btcd is now Beta (#130)
• Add a new checkpoint at block height 300255

Protocol and network related changes:

• Lower the minimum transaction relay fee to 1000 satoshi to match recent reference client changes (#100)
• Raise the maximum signature script size to support standard 15-of-15 multi-signature pay-to-sript-hash transactions with compressed pubkeys to remain compatible with the reference client (#128)
• Reduce max bytes allowed for a standard nulldata transaction to 40 for compatibility with the reference client
• Introduce a new btcnet package which houses all of the network params for each network (mainnet, testnet3, regtest) to ultimately enable easier addition and tweaking of networks without needing to change several packages
• Fix several script discrepancies found by reference client test data
• Add new DNS seed for peer discovery (seed.bitnodes.io)
• Reduce the max known inventory cache from 20000 items to 1000 items
• Fix an issue where unknown inventory types could lead to a hung peer
• Implement inventory rebroadcast handler for sendrawtransaction (#99)
• Update user agent to fully support BIP0014 (btcsuite/btcwire#10)

Implement initial mining support:

• Add a new logging subsystem for mining related operations
• Implement infrastructure for creating block templates
• Provide options to control block template creation settings
• Support the getwork RPC
• Allow address identifiers to apply to more than one network since both testnet3 and the regression test network unfortunately use the same identifier

RPC changes:

• Set the content type for HTTP POST RPC connections to application/json (#121)
• Modified the RPC server startup so it only requires at least one valid listen interface
• Correct an error path where it was possible certain errors would not be returned
• Implement getwork command (#125)
• Update sendrawtransaction command to reject orphans
• Update sendrawtransaction command to include the reason a transaction was rejected
• Update getinfo command to populate connection count field
• Update getinfo command to include relay fee field (#107)
• Allow transactions submitted with sendrawtransaction to bypass the rate limiter
• Allow the getcurrentnet and getbestblock extensions to be accessed via HTTP POST in addition to Websockets (#127)

Websocket changes:

• Rework notifications to ensure they are delivered in the order they occur
• Rename notifynewtxs command to notifyreceived (funds received)
• Rename notifyallnewtxs command to notifynewtransactions
• Rename alltx notification to txaccepted
• Rename allverbosetx notification to txacceptedverbose (#98)
• Add rescan progress notification
• Add recvtx notification
• Add redeemingtx notification
• Modify notifyspent command to accept an array of outpoints (#123)
• Significantly optimize the rescan command to yield up to a 60x speed increase

btcctl utility changes:

• Add createencryptedwallet command
• Add getblockchaininfo command
• Add importwallet commmand
• Add addmultisigaddress commmand
• Add setgenerate command
• Accept --testnet and --wallet flags which automatically select the appropriate port and TLS certificates needed to communicate with btcd and btcwallet (#112)
• Allow path expansion from config file entries (#113)
• Minor refactor to simplify handling of options

addblock utility changes:

• Improve logging by making it consistent with the logging provided by btcd (#90)

Improve several package APIs for developers:

• Add new amount type for consistently handling monetary values
• Add new coin selector API
• Add new WIF (Wallet Import Format) API
• Add new crypto types for private keys and signatures
• Add new API to sign transactions including script merging and hash types
• Expose function to extract all pushed data from a script (btcsuite/btcscript#8)

Misc changes:

• Optimize address manager shuffling to do 67% less work on average
• Resolve a couple of benign data races found by the race detector (#101)
• Add IP address to all peer related errors to clarify which peer is the cause (#102)
• Fix a UPNP case issue that prevented the --upnp option from working with some UPNP servers
• Update documentation in the sample config file regarding debug levels
• Adjust some logging levels to improve debug messages
• Improve the throughput of query messages to the block manager
• Several minor optimizations to reduce GC churn and enhance speed
• Other minor refactoring
• General code cleanup

Code Contributors (alphabetical order)

• Chris Jepson
• Dale Rahn
• Dave Collins
• David Hill
• Francis Lam
• Geert Johan
• Javed Khan
• Jimmy Song
• John C. Vernaleo
• Jolan Luff
• Marco Peereboom
• Owain G. Ainsworth

• Fix an issue when parsing scripts which contain a multi-signature script
  which require zero signatures such as testnet block
  000000001881dccfeda317393c261f76d09e399e15e27d280e5368420f442632
  (btcsuite/btcscript#7)
• Add check to ensure all transactions accepted to mempool only contain
  canonical data pushes (btcsuite/btcscript#6)
• Fix an issue causing excessive memory consumption
• Significantly rework and improve the websocket notification system:
  • Each client is now independent so slow clients no longer limit the
    speed of other connected clients
  • Potentially long-running operations such as rescans are now run in
    their own handler and rate-limited to one operation at a time without
    preventing simultaneous requests from the same client for the faster
    requests or notifications
  • A couple of scenarios which could cause shutdown to hang have been
    resolved
  • Update notifynewtx notifications to support all address types instead
    of only pay-to-pubkey-hash
  • Provide a --rpcmaxwebsockets option to allow limiting the number of
    concurrent websocket clients
  • Add a new websocket command notifyallnewtxs to request notifications
    (#86) (thanks @flammit)
• Improve btcctl utility in the following ways:
  • Add getnetworkhashps command
  • Add gettransaction command (wallet-specific)
  • Add signmessage command (wallet-specific)
  • Update getwork command to accept the correct arguments
• Continue cleanup and work on implementing the RPC API:
  • Implement getnettotals command
    (#84)
  • Implement networkhashps command
    (#87)
  • Update getpeerinfo to always include syncnode field even when false
  • Remove help addenda for getpeerinfo now that it supports all fields
• Close standard RPC connections on auth failure
• Provide a --rpcmaxclients option to allow limiting the number of
  concurrent RPC clients (#68)
• Include IP address in RPC auth failure log messages
• Resolve a rather harmless data race found by the race detector
  (#94)
• Increase block priority size and max standard transaction size to 50k
  and 100k, respectively (#71)
• Add rate limiting of free transactions to the memory pool to prevent
  penny flooding (#40)
• Provide a --logdir option (#95)
• Change the default log file path to include the network
• Add a new ScriptBuilder interface to btcscript to support creation of
  custom scripts (btcsuite/btcscript#5)
• General code cleanup

• Fix an issue when parsing scripts which contain invalid signatures that
  caused a chain fork on block
  0000000000000001e4241fd0b3469a713f41c5682605451c05d3033288fb2244
• Correct an issue which could lead to an error in removeBlockNode
  (btcsuite/btcchain#4)
• Improve addblock utility as follows:
  • Check imported blocks against all chain rules and checkpoints
  • Skip blocks which are already known so you can stop and restart the
    import or start the import after you have already downloaded a portion
    of the chain
  • Correct an issue where the utility did not shutdown cleanly after
    processing all blocks
  • Add error on attempt to import orphan blocks
  • Improve error handling and reporting
  • Display statistics after input file has been fully processed
• Rework, optimize, and improve headers-first mode:
  • Resuming the chain sync from any point before the final checkpoint
    will now use headers-first mode
    (#69)
  • Verify all checkpoints as opposed to only the final one
  • Reduce and bound memory usage
  • Rollback to the last known good point when a header does not match a
    checkpoint
  • Log information about what is happening with headers
• Improve btcctl utility in the following ways:
  • Add getaddednodeinfo command
  • Add getnettotals command
  • Add getblocktemplate command (wallet-specific)
  • Add getwork command (wallet-specific)
  • Add getnewaddress command (wallet-specific)
  • Add walletpassphrasechange command (wallet-specific)
  • Add walletlock command (wallet-specific)
  • Add sendfrom command (wallet-specific)
  • Add sendmany command (wallet-specific)
  • Add settxfee command (wallet-specific)
  • Add listsinceblock command (wallet-specific)
  • Add listaccounts command (wallet-specific)
  • Add keypoolrefill command (wallet-specific)
  • Add getreceivedbyaccount command (wallet-specific)
  • Add getrawchangeaddress command (wallet-specific)
  • Add gettxoutsetinfo command (wallet-specific)
  • Add listaddressgroupings command (wallet-specific)
  • Add listlockunspent command (wallet-specific)
  • Add listlock command (wallet-specific)
  • Add listreceivedbyaccount command (wallet-specific)
  • Add validateaddress command (wallet-specific)
  • Add verifymessage command (wallet-specific)
  • Add sendtoaddress command (wallet-specific)
• Continue cleanup and work on implementing the RPC API:
  • Implement submitblock command
    (#61)
  • Implement help command
  • Implement ping command
  • Implement getaddednodeinfo command
    (#78)
  • Implement getinfo command
  • Update getpeerinfo to support bytesrecv and bytessent
    (#83)
• Improve and correct several RPC server and websocket areas:
  • Change the connection endpoint for websockets from /wallet to /ws
    (#80)
  • Implement an alternative authentication for websockets so clients
    such as javascript from browsers that don't support setting HTTP
    headers can authenticate (#77)
  • Add an authentication deadline for RPC connections
    (#68)
  • Use standard authentication failure responses for RPC connections
  • Make automatically generated certificate more standard so it works
    from clients such as node.js and Firefox
  • Correct some minor issues which could prevent the RPC server from
    shutting down in an orderly fashion
  • Make all websocket notifications require registration
  • Change the data sent over websockets to text since it is JSON-RPC
  • Allow connections that do not have an Origin header set
• Expose and track the number of bytes read and written per peer
  (btcsuite/btcwire#6)
• Correct an issue with sendrawtransaction when invoked via websockets
  which prevented a minedtx notification from being added
• Rescan operations issued from remote wallets are no stopped when
  the wallet disconnects mid-operation
  (#66)
• Several optimizations related to fetching block information from the
  database
• General code cleanup

• Optimize initial block download by introducing a new mode which
  downloads the block headers first (up to the final checkpoint)
• Improve peer handling to remove the potential for slow peers to cause
  sluggishness amongst all peers
  (#63)
• Fix an issue where the initial block sync could stall when the sync peer
  disconnects (#62)
• Correct an issue where --externalip was doing a DNS lookup on the full
  host:port instead of just the host portion
  (#38)
• Fix an issue which could lead to a panic on chain switches
  (#70)
• Improve btcctl utility in the following ways:
  • Show getdifficulty output as floating point to 6 digits of precision
  • Show all JSON object replies formatted as standard JSON
  • Allow btcctl getblock to accept optional params
  • Add getaccount command (wallet-specific)
  • Add getaccountaddress command (wallet-specific)
  • Add sendrawtransaction command
• Continue cleanup and work on implementing RPC API calls
  • Update getrawmempool to support new optional verbose flag
  • Update getrawtransaction to match the reference client
  • Update getblock to support new optional verbose flag
  • Update raw transactions to fully match the reference client including
    support for all transaction types and address types
  • Correct getrawmempool fee field to return BTC instead of Satoshi
  • Correct getpeerinfo service flag to return 8 digit string so it
    matches the reference client
  • Correct verifychain to return a boolean
  • Implement decoderawtransaction command
  • Implement createrawtransaction command
  • Implement decodescript command
  • Implement gethashespersec command
  • Allow RPC handler overrides when invoked via a websocket versus
    legacy connection
• Add new DNS seed for peer discovery
• Display user agent on new valid peer log message
  (#64)
• Notify wallet when new transactions that pay to registered addresses
  show up in the mempool before being mined into a block
• Support a tor-specific proxy in addition to a normal proxy
  (#47)
• Remove deprecated sqlite3 imports from utilities
• Remove leftover profile write from addblock utility
• Quite a bit of code cleanup and refactoring to improve maintainability

• Allow listen interfaces to be specified via --listen instead of only the
  port (#33)
• Allow listen interfaces for the RPC server to be specified via
  --rpclisten instead of only the port
  (#34)
• Only disable listening when --connect or --proxy are used when no
  --listen interface are specified
  (#10)
• Add several new standard transaction checks to transaction memory pool:
  • Support nulldata scripts as standard
  • Only allow a max of one nulldata output per transaction
  • Enforce a maximum of 3 public keys in multi-signature transactions
  • The number of signatures in multi-signature transactions must not
    exceed the number of public keys
  • The number of inputs to a signature script must match the expected
    number of inputs for the script type
  • The number of inputs pushed onto the stack by a redeeming signature
    script must match the number of inputs consumed by the referenced
    public key script
• When a block is connected, remove any transactions from the memory pool
  which are now double spends as a result of the newly connected
  transactions
• Don't relay transactions resurrected during a chain switch since
  other peers will also be switching chains and therefore already know
  about them
• Cleanup a few cases where rejected transactions showed as an error
  rather than as a rejected transaction
• Ignore the default configuration file when --regtest (regression test
  mode) is specified
• Implement TLS support for RPC including automatic certificate generation
• Support HTTP authentication headers for web sockets
• Update address manager to recognize and properly work with Tor
  addresses (#36) and
  (#37)
• Improve btcctl utility in the following ways:
  • Add the ability to specify a configuration file
  • Add a default entry for the RPC cert to point to the location
    it will likely be in the btcd home directory
  • Implement --version flag
  • Provide a --notls option to support non-TLS configurations
• Fix a couple of minor races found by the Go race detector
• Improve logging
  • Allow logging level to be specified on a per subsystem basis
    (#48)
  • Allow logging levels to be dynamically changed via RPC
    (#15)
  • Implement a rolling log file with a max of 10MB per file and a
    rotation size of 3 which results in a max logging size of 30 MB
• Correct a minor issue with the rescanning websocket call
  (#54)
• Fix a race with pushing address messages that could lead to a panic
  (#58)
• Improve which external IP address is reported to peers based on which
  interface they are connected through
  (#35)
• Add --externalip option to allow an external IP address to be specified
  for cases such as tor hidden services or advanced network configurations
  (#38)
• Add --upnp option to support automatic port mapping via UPnP
  (#51)
• Update Ctrl+C interrupt handler to properly sync address manager and
  remove the UPnP port mapping (if needed)
• Continue cleanup and work on implementing RPC API calls
  • Add importprivkey (import private key) command to btcctl
  • Update getrawtransaction to provide addresses properly, support
    new verbose param, and match the reference implementation with the
    exception of MULTISIG (thanks @flammit)
  • Update getblock with new verbose flag (thanks @flammit)
  • Add listtransactions command to btcctl
  • Add getbalance command to btcctl
• Add basic support for btcd to run as a native Windows service
  (#42)
• Package addblock utility with Windows MSIs
• Add support for TravisCI (continuous build integration)
• Cleanup some documentation and usage
• Several other minor bug fixes and general code cleanup