diff --git a/NOTES.md b/NOTES.md
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+++ b/NOTES.md
@@ -0,0 +1,42 @@
+# It's working!
+
+cache hits take nanoseconds, while cache misses take microseconds!
+
+```
+7339 INFO [1658345227.461206] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=59759, time_cost=9.56µs
+7340 INFO [1658345227.461220] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=63745, time_cost=7.324µs
+7341 INFO [1658345227.461226] [src/chainstate/stacks/index/storage.rs:160] [chains-coordinator] get_block_hash_caching: result=hit, id=77453, time_cost=79ns
+7342 INFO [1658345227.461228] [src/chainstate/stacks/index/storage.rs:160] [chains-coordinator] get_block_hash_caching: result=hit, id=76941, time_cost=46ns
+7343 INFO [1658345227.461238] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=65580, time_cost=7.654µs
+7344 INFO [1658345227.461251] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=68751, time_cost=6.842µs
+7345 INFO [1658345227.461264] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=73904, time_cost=7.688µs
+7346 INFO [1658345227.461270] [src/chainstate/stacks/index/storage.rs:160] [chains-coordinator] get_block_hash_caching: result=hit, id=76511, time_cost=46ns
+7347 INFO [1658345227.461279] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=76867, time_cost=7.2µs
+7348 INFO [1658345227.461293] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=54613, time_cost=7.278µs
+7349 INFO [1658345227.461306] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=73458, time_cost=7.12µs
+7350 INFO [1658345227.461312] [src/chainstate/stacks/index/storage.rs:160] [chains-coordinator] get_block_hash_caching: result=hit, id=77449, time_cost=43ns
+7351 INFO [1658345227.461321] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=68660, time_cost=6.971µs
+7352 INFO [1658345227.461338] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=73775, time_cost=10.218µs
+7353 INFO [1658345227.461348] [src/chainstate/stacks/index/storage.rs:160] [chains-coordinator] get_block_hash_caching: result=hit, id=77455, time_cost=58ns
+7354 INFO [1658345227.461362] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=67602, time_cost=11.206µs
+7355 INFO [1658345227.461383] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=64758, time_cost=10.333µs
+7356 INFO [1658345227.461402] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=58012, time_cost=9.869µs
+7357 INFO [1658345227.461420] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=69439, time_cost=9.537µs
+7358 INFO [1658345227.461434] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=72850, time_cost=7.529µs
+7359 INFO [1658345227.461449] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=50171, time_cost=8.962µs
+7360 INFO [1658345227.461479] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=48620, time_cost=19.666µs
+7361 INFO [1658345227.461499] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=63607, time_cost=9.789µs
+7362 INFO [1658345227.461517] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=64732, time_cost=8.965µs
+7363 INFO [1658345227.461537] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=71049, time_cost=10.277µs
+7364 INFO [1658345227.461551] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=65656, time_cost=6.927µs
+7365 INFO [1658345227.461565] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=72320, time_cost=8.113µs
+7366 INFO [1658345227.461581] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=49014, time_cost=9.29µs
+7367 INFO [1658345227.461594] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=74839, time_cost=7.647µs
+7368 INFO [1658345227.461607] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=76901, time_cost=7.055µs
+7369 INFO [1658345227.461621] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=63994, time_cost=7.344µs
+7370 INFO [1658345227.461635] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=70456, time_cost=7.298µs
+7371 INFO [1658345227.461648] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=74581, time_cost=7.591µs
+7372 INFO [1658345227.461662] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=51911, time_cost=7.235µs
+7373 INFO [1658345227.461676] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=46962, time_cost=8.227µs
+7374 INFO [1658345227.461689] [src/chainstate/stacks/index/storage.rs:144] [chains-coordinator] get_block_hash_caching: result=miss, id=69931, time_cost=7.24µs
+```