{"status":"ok","chain_head":"9982cc4a0251c0083fa668b081307512c340184606104cf60555a006504ed09f","latest_block_date":"2026-09-11","block_height":44,"genesis_date":"2026-07-22","chain_format":"1","head_slice_sha256":"6a19b8c84e02444d46b2c729a0069bf7cef5e46e02cdf2cc56946135f91ab381","head_prev_block_sha256":"950add6c7a60b3e8d27393eaf05102f4eec94e994201beb90fe9b820dc465424","head_record_count":546144,"populations":{"docker":490,"mcp":319,"npm":532036,"schema":13299},"spec_version":"1.0","spec_url":"https://github.com/nerqai/lastseen/blob/main/docs/HASHCHAIN-SPEC.md","notice":"Each daily block is SHA-256(prev_block + ':' + date + ':' + slice_sha256); the slice is the sorted canonical lines of every observation dated that day. Absence of a population on a day is NOT a zero row (interval-censored). The head is anchored in each Zenodo dataset version so it cannot be backdated."}