Bitcoin ABC 0.34.1 Release Notes

Bitcoin ABC version 0.34.1 is now available from:

https://download.bitcoinabc.org/0.34.1/

This release includes the following features and fixes:

• Add new format string placeholders for walletnotify:
  • %b - the hash of the block containting the transaction (unconfirmed if a mempool transaction)
  • %h - the height of the block containing the transaction (-1 if a mempool transaction)
• Add a shutdownnotify option to specify a command to execute synchronously before Bitcoin ABC has begun its shutdown sequence.
• On non-Windows systems, an authenticated RPC caller allowed to create wallets could execute arbitrary commands as the node process account when -walletnotify was configured, by crafting a wallet name with regex replacement characters. Wallet notification placeholder replacement now treats wallet names literally.
• Add new endpoints to the REST API: blockfilter and blockfilterheaders. See doc/REST-interface.md for details.
• The /headers/ endpoint of the REST API has been updated to use a query parameter instead of path parameter to specify the result count. The count parameter is now optional, and defaults to 5. Use GET /rest/headers/<BLOCK-HASH>.<bin|hex|json>?count=<COUNT=5> instead of GET /rest/headers/<COUNT>/<BLOCK-HASH>.<bin|hex|json> (deprecated)
• New Chronik options -chroniksubsmaxscriptsize and -chroniksubsmaxpluginsize limit the size of scripts and plugin groups that can be registered on WebSocket subscriptions (defaults: 201 and 100 bytes). Oversized payloads are still indexed and remain available via HTTP and txid lookup.
• The Chronik Electrum peer discovery feature is now disabled by default. To enable it, set the desired peer check interval with the -chronikelectrumpeersvalidationinterval node option.