Snapshots

Bootstrap a node from a recent snapshot of a fully synced datadir instead of syncing Arbitrum Sepolia from genesis. The snapshot bundles both the Arbitrum Reth execution state and the Nitro consensus state.

Latest snapshot

Network	Block	Date	Size
Arbitrum Sepolia (421614)	272,465,745	2026-05-31	998 GiB

latest.json always points to the newest snapshot. Check the current block, URL, and checksum:

curl -s https://snapshots-r2.arbreth.rs/arbreth-sepolia/latest.json

Plan for about 1 TB to download and about 3 TB extracted (1.4 TB MDBX state, 1.5 TB reth static files, plus the Nitro data).

Download

Download with aria2c (parallel, resumable):

aria2c -x16 -s16 https://snapshots-r2.arbreth.rs/arbreth-sepolia/272465745/snapshot.tar.zst

Optionally verify the checksum before extracting:

echo "c98312671a876cea14f6aa6c291ffb998dfd3cc9f4f63c4e42c723e7615353fd  snapshot.tar.zst" | sha256sum -c

Extract

Extract into /data. The archive restores arbreth-data (execution state) and nitro-data (consensus state):

zstd -dc snapshot.tar.zst | tar -xf - -C /data

Run

Point Compose at the two directories in .env:

DATA_DIR=/data/arbreth-data
NITRO_DATA_DIR=/data/nitro-data

Then start the stack:

docker compose up -d

Both services start already synced to the snapshot block. The reth datadir is arbreth-data/db, and the shared jwt.hex inside arbreth-data authenticates the execution client and Nitro.

Older snapshots

Archived snapshots at roughly 40M-block spacing. Each lives under the same arbreth-sepolia/<block>/ path with its own manifest.json.

Block	Date	Size
13,984,099	2026-03-29	53 GiB
53,455,712	2026-04-06	202 GiB
89,962,814	2026-04-24	417 GiB
124,808,115	2026-05-07	596 GiB
165,696,725	2026-05-13	784 GiB
202,542,211	2026-05-18	942 GiB
242,809,010	2026-05-23	1086 GiB

Download any block by substituting its number, then extract and run the same way as above:

B=89962814
aria2c -x16 -s16 https://snapshots-r2.arbreth.rs/arbreth-sepolia/$B/snapshot.tar.zst

index.json lists every snapshot with its block, size, URL, and checksum:

curl -s https://snapshots-r2.arbreth.rs/arbreth-sepolia/index.json

Older snapshots carry an MD5 in each manifest.json. Verify it before extracting:

B=89962814
MD5=$(curl -s https://snapshots-r2.arbreth.rs/arbreth-sepolia/$B/manifest.json | grep -o '"md5": "[^"]*"' | cut -d'"' -f4)
echo "$MD5  snapshot.tar.zst" | md5sum -c

Sync from genesis instead

Skip the snapshot and let the node sync from genesis. See Installation.