The RPC get_block_template
fails when a cell has been used as a cell dep and an input in the different transactions.
Say cell C is used as a dep group in the transaction A, and is destroyed in the transaction B.
The node adds transaction A first, then B into the transaction pool. They are both valid. But when generating the block template, if the fee rate of B is higher, it comes before A, which will invalidate A. Currently the RPC get_block_template
will fail instead of dropping A.
First, the get_block_template
should not fail but dropping the conflict transactions.
Then we can propose solution to this issue. Here is an example. When a transaction is added to the pool, the pool must consider it depending on all the transactions which dep cell (direct or indirect via dep group) has been destroyed in this transaction. Because future transactions using the destroyed cells as dep will be rejected, the spending transaction only need to wait for all the existing dep transactions on chain.
{ "nvd_published_at": null, "cwe_ids": [ "CWE-367" ], "severity": "HIGH", "github_reviewed": true, "github_reviewed_at": "2021-08-02T21:55:20Z" }