Locates the chain link carrying hash, walking every account's lineage through the public
read surface — a bounded forensic lookup, not an indexed query. Case-insensitive exact match;
the genesis prevHash never matches (it is not a posting hash). Null on a miss, or once
scanMax links (default 20 000) have been walked.
Locates the chain link carrying
hash, walking every account's lineage through the public read surface — a bounded forensic lookup, not an indexed query. Case-insensitive exact match; the genesis prevHash never matches (it is not a posting hash). Null on a miss, or oncescanMaxlinks (default 20 000) have been walked.