- Peers which provide a chain with less work than the minimum-chain-work during IBD will now be disconnected.
- For a given outbound peer, we now check whether their best known block has at least as much work as our tip. If it
doesn't, and if we still haven't heard about a block with sufficient work after a 20 minute timeout, then we send
a single getheaders message, and wait 2 more minutes. If after two minutes their best known block has insufficient
work, we disconnect that peer. We protect 4 of our outbound peers from being disconnected by this logic to prevent
excessive network topology changes as a result of this algorithm, while still ensuring that we have a reasonable
number of nodes not known to be on bogus chains.
- Outbound (non-manual) peers that serve us block headers that are already known to be invalid (other than compact
block announcements, because BIP 152 explicitly permits nodes to relay compact blocks before fully validating them)
will now be disconnected.
- If the chain tip has not been advanced for over 30 minutes, we now assume the tip may be stale and will try to connect
to an additional outbound peer. A periodic check ensures that if this extra peer connection is in use, we will disconnect
the peer that least recently announced a new block.
- The set of all known invalid-themselves blocks (i.e. blocks which we attempted to connect but which were found to be
invalid) are now tracked and used to check if new headers build on an invalid chain. This ensures that everything that
descends from an invalid block is marked as such.
Minimum relay fee lowered
-------------------------
The minimum relay fee `-minrelayfee` has been lowered to 0.01 lites per kB (0.00001 LTC). This is to prepare for dropping the minimum transaction fee to 0.1 lites per kB (0.0001 LTC) in the next release.
Mempool replacement disabled by default
---------------------------------------
Mempool replacement `--mempoolreplacement` has been disabled by default.
Miner block size limiting deprecated
------------------------------------
Though blockmaxweight has been preferred for limiting the size of blocks returned by
getblocktemplate since 0.13.0, blockmaxsize remained as an option for those who wished
to limit their block size directly. Using this option resulted in a few UI issues as
well as non-optimal fee selection and ever-so-slightly worse performance, and has thus
now been deprecated. Further, the blockmaxsize option is now used only to calculate an
implied blockmaxweight, instead of limiting block size directly. Any miners who wish
to limit their blocks by size, instead of by weight, will have to do so manually by
removing transactions from their block template directly.
GUI settings backed up on reset
-------------------------------
The GUI settings will now be written to `guisettings.ini.bak` in the data directory before wiping them when
the `-resetguisettings` argument is used. This can be used to retroactively troubleshoot issues due to the
GUI settings.
Duplicate wallets disallowed
----------------------------
Previously, it was possible to open the same wallet twice by manually copying the wallet file, causing
issues when both were opened simultaneously. It is no longer possible to open copies of the same wallet.
Debug `-minimumchainwork` argument added
----------------------------------------
A hidden debug argument `-minimumchainwork` has been added to allow a custom minimum work value to be used
when validating a chain.
Low-level RPC changes
----------------------
- The "currentblocksize" value in getmininginfo has been removed.
-`dumpwallet` no longer allows overwriting files. This is a security measure
as well as prevents dangerous user mistakes.
-`backupwallet` will now fail when attempting to backup to source file, rather than
destroying the wallet.
-`listsinceblock` will now throw an error if an unknown `blockhash` argument
value is passed, instead of returning a list of all wallet transactions since
the genesis block. The behaviour is unchanged when an empty string is provided.
0.15.1 Change log
=================
### Mining
-#11100`7871a7d` Fix confusing blockmax{size,weight} options, dont default to throwing away money (TheBlueMatt)
### RPC and other APIs
-#10859`2a5d099` gettxout: Slightly improve doc and tests (jtimon)
-#11267`b1a6c94` update cli for estimate\*fee argument rename (laanwj)
-#11483`20cdc2b` Fix importmulti bug when importing an already imported key (pedrobranco)
-#9937`a43be5b` Prevent `dumpwallet` from overwriting files (laanwj)
-#11465`405e069` Update named args documentation for importprivkey (dusty-wil)
