Notable changes

Policy

• The maximum number of potentially executed legacy signature operations in a single standard transaction is now limited to 2500. Signature operations in all previous output scripts, in all input scripts, as well as all P2SH redeem scripts (if there are any) are counted toward the limit. The new limit is assumed to not affect any known typically formed standard transactions. The change was done to prepare for a possible BIP54 deployment in the future. (#32521)
• -datacarriersize is increased to 100,000 by default, which effectively uncaps the limit (as the maximum transaction size limit will be hit first). It can be overridden with -datacarriersize=83 to revert to the limit enforced in previous versions. Both -datacarrier and -datacarriersize options have been marked as deprecated and are expected to be removed in a future release. (#32406)
• Multiple data carrier (OP_RETURN) outputs in a transaction are now permitted for relay and mining. The -datacarriersize limit applies to the aggregate size of the scriptPubKeys across all such outputs in a transaction, not including the scriptPubKey size itself. (#32406)
• The minimum block feerate (-blockmintxfee) has been changed to 0.001 satoshi per vB. It can still be changed using the configuration option. (#33106)
• The default minimum relay feerate (-minrelaytxfee) and incremental relay feerate (-incrementalrelayfee) have been changed to 0.1 satoshis per vB. They can still be changed using their respective configuration options, but it is recommended to change both together if you decide to do so. (#33106)