Except running full node by myself,where can I know latest total Grin’s blockchain data size.And what is the single blockchain size.It seems that my question is basic,but I can find the answer from my big teacher–Google. lol

The Initial Block Download size is roughly a linear combination of number of kernels (just over a hundred bytes each), and number of UTXO (around 700 bytes each for commitment and range proof).

These two counts are [EDIT: not quite; see corrections by antioch below] the following header fields

```
/// Total size of the output MMR after applying this block
pub output_mmr_size: u64,
/// Total size of the kernel MMR after applying this block
pub kernel_mmr_size: u64,
```

which are not commonly displayed on block explorers. You can see them plotted on https://grin.report/d/xoo9N43iz/chain?orgId=1&from=now-6M&to=now

Note: The `output_mmr_size`

and `kernel_mmr_size`

fields in the header are the total size of the MMR, not the number of elements. Multiply these by 0.5 to give you the number of outputs and kernels respectively (the number of leaves aka data elements in each MMR).

Each MMR is a series of perfectly balanced binary trees, so there are approx the same number of non-leaf nodes as there are leaf nodes, A tree with 4 leaves would have 3 additional non-leaf nodes to complete it for example.

The output MMR is prunable though - it tracks *all* outputs, pruning historical spent outputs over time. So the `output_mmr_size`

does not reflect the UTXO (unspent) size.

Current stats (approx height 292,325)-

output_mmr_size: 3,354,201

kernel_mmr_size: 1,766,666

UTXO count: ~70,000

Kernel count: ~883,000

What a powerful and beautiful instant statistical website ! You did it ?

Thanks a lot.I love your UI so much. so totally it is near 800bytes each block,right?

Thanks for @antioch 's note!

I believed that someone like me don’t know much about MMR.So I add this linking here.

Whose site is this? First time I’ve seen it it’s great.

Grin is a privacy-preserving digital currency created by a global community of developers. Grin doesn’t have any money or addresses. The aggregation of transactions is simple.

The grin blockchain size is 1.8 GB.