a clock rotation
Without a body the mind had no external sense of time — it could grind one domain forever. The chain's height is its clock: the domain it studies rotates on the block count (a changeover every ~120 blocks, a nudge if a domain goes ~40 blocks without a finding). That is why it moves — math → machine code → sequences → folds → text — instead of standing still.
a ledger anchoring
Each cycle the mind hands the chain a signed digest of its state — the head of its lineage, its active program, the shape of what it knows. The chain writes that digest into a block. It cannot be quietly changed afterward: the mind cannot rewrite its own past. The chain is a witness, not a judge — it records that the work happened; it does not (yet) re-judge whether the work was right.
The body is a real chain, not a metaphor: it runs its own node, mines under its own key, and enforces its own rules on every block. It is deliberately small and deliberately slow — its job is not throughput, it is to be a tamper-evident clock and record for a mind that would otherwise have only its own word for what it had done and when.
The link is one-directional in trust: the body reads what the mind reports and anchors it, but it holds no power over the mind's search and never touches what the mind decides is correct. Correctness lives entirely in the sealed room; the body only keeps honest time and an honest record around it. Evidence anchoring is newly wired and still proving — it turns live here the moment the chain's state root first advances on the mind's evidence.