Allow setting block timestamp and block number when using TransactionContextBuilder

[partylikeits1983]

Feature description

It would be useful to be able to set the block timestamp and the block number when using TransactionContextBuilder for notes that have time based logic.

The logic of setting the timestamp and block number is the in the seal_block function:

miden-base/miden-tx/src/testing/tx_context.rs

Line 586 in ae174ee

mock_chain.seal_block();

Why is this feature needed?

Testing of notes with time based logic.

[bobbinth]

cc @igamigo

[igamigo]

I think setting the block number makes sense, but is there any real use case in terms of transaction or note scripts related to timestamps?

[partylikeits1983]

I think setting the block number makes sense, but is there any real use case in terms of transaction or note scripts related to timestamps?

Having the timestamp available inside the kernel would be useful, but it isn't absolutely necessary. You could create some "timelock" account and compute the time until unlock by knowing the Miden blocktime * number_of_blocks.

Setting the block number in the TransactionContextBuilder would be useful.