--- /dev/null
+ SRC_SIZE || BLK_SIZE || HASH0 || HASH1 || ...
+
+SRC_SIZE contains size of the source, when it was initially read.
+BLK_SIZE is the blocksize used. Both are 64-bit big-endian unsigned
+integers. If either size or blocksize differs, then syncer will deny
+using that statefile as a precaution. HASHx is BLAKE3-256 hash output.