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Users who are running v27.0.0 or earlier are encouraged to upgrade to v27.1.0 as it includes some bugfixes as well as updated checkpoints for the recently completed (15 May 2024) network upgrade. It also include some performance and reliability fixes related to transaction processing.

The internal transaction processing logic for both regular and orphan transactions has been reworked to be more performant and more reliable.

The command-line option -upgrade10activationtime has been renamed to -upgrade10activationheight and is now height-based, rather than MTP time-based. The next upgrade is still expected to be MTP time-based.

BIP70 payment request support has been removed from the Qt-based GUI. The reason for this is that BIP70 payment requests have historically suffered from a number of security flaws and maintainence of this feature poses a risk to full node software. Users wishing to use a GUI wallet that supports BIP70 are recommended to use one of the many light wallets such as Electron Cash or Bitcoin.com that continue to support BIP70 payment requests.

CashToken support is low-level at this stage. The wallet application does not yet keep track of the user's tokens. Tokens are only manageable via RPC commands currently. They only persist through the UTXO database and block database at this point. There are existing RPC commands to list and filter for tokens in the UTXO set. RPC raw transaction handling commands have been extended to allow creation (and sending) of token transactions. Interested users are advised to consult the functional test in test/functional/bchn-rpc-tokens.py for examples on token transaction construction and listing. Future releases will aim to extend the RPC API with more convenient ways to create and spend tokens, as well as upgrading the wallet storage and indexing subsystems to persistently store data about tokens of interest to the user. Later we expect to add GUI wallet management of Cash Tokens.

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