Authenticate the block advertised by an Octez snapshot
A snapshot can be internally consistent while describing an unintended chain. Compare its block identity with an independent reference before using it to bootstrap a node.
Inspect the file separately from the download page
Set SNAPSHOT to the local snapshot file. Read the reported level, block hash and snapshot kind. Obtain the block hash for that level from an independently trusted node on the intended network.
octez-node snapshot info "$SNAPSHOT"
If a publisher advertises level 4,500,000 but the file and trusted node disagree on its hash, stop the import and resolve the discrepancy. A checksum supplied beside the file can catch download corruption but shares the publisher’s trust boundary.
Bind the verified hash to import
Octez snapshot import supports an expected block hash via the block option. Supply the full independently checked hash to the import performed in the intended node data directory. Snapshot kind also determines what historical workloads the resulting node can immediately serve. octez.tezos.com Octez protocol documentation