Create a state containing post-NU5 blocks

[upbqdn]

Address

zebra/zebra-rpc/src/methods/tests/snapshot.rs

Lines 72 to 80 in 824e520

	// We need to set the NU5 activation height higher than the height of the last block for
	// this test because we currently have only the first 10 blocks from the public Testnet,
	// none of which are compatible with NU5 due to the following consensus rule:
	//
	// > [NU5 onward] hashBlockCommitments MUST be set to the value of
	// > hashBlockCommitments for this block, as specified in [ZIP-244].
	//
	// Activating NU5 at a lower height and using the 10 blocks causes a failure in
	// [`zebra_state::populated_state`].

Being able to create a state containing blocks for which we could activate NU5 is beneficial for tests, see: #8535.

Blocks #8535.

[mpguerra]

@ZcashFoundation/zebra-team Is this still relevant?

[upbqdn]

Yes, it is. We don't have a test chain with post-NU5 blocks.

[upbqdn]

@ZcashFoundation/zebra-team does anyone know how we can do this?

If we agree that it's not feasible, we can close this issue.

[conradoplg]

@ZcashFoundation/zebra-team does anyone know how we can do this?

If we agree that it's not feasible, we can close this issue.

I think the best approach would be to create a regtest blockchain with small activation heights, with NU5 blocks. We'd need wallet code to do that, so we could either use librustzcash directly or wait for the zcashd-wallet-replacement to be functional and use that to generate the blocks (or maybe we can use QEDIT's tool?)