When I run a test using light test-validator, the checksum verification fails.

[KztTateyama]

I ran light test-validator and did a test, but it failed.

Seeing basic-operations/anchor/create/test-ledger/photon.log, I found 403 error like below.

2026-07-21T03:31:39.703755Z ERROR connection{remote_addr=127.0.0.1:52116 conn_id=9}: photon_indexer::api::error: Internal server error: Error fetching proof Ok("{\"code\":\"proving_error\",\"message\":\"non-inclusion proof: failed to download key ~/.config/light/proving-keys/v2_non-inclusion_40_1.key: failed to load checksums: failed to download CHECKSUM file: HTTP 403\"}")

Also, I found a source code which the above message has.

light-protocol/prover/server/prover/common/key_downloader.go

Lines 82 to 85 in 5d58e11

	if resp.StatusCode != http.StatusOK {
	return fmt.Errorf("failed to download CHECKSUM file: HTTP %d", resp.StatusCode)
	}

And this code also defines URL which gets CHECKSUM file.

light-protocol/prover/server/prover/common/key_downloader.go

Lines 17 to 23 in 5d58e11

	const (
	DefaultBaseURL = "https://storage.googleapis.com/light-protocol-proving-keys/light-protocol-keys"
	DefaultMaxRetries = 10
	DefaultRetryDelay = 5 * time.Second
	DefaultMaxRetryDelay = 5 * time.Minute
	)

When I ran curl directly on this URL, I also received a 403 error.

Should you have any information, please let me know. Thank you.

[sergeytimoshin]

Fixed in #2382