{
  "exchange_slug": "boerse-stuttgart",
  "exchange_name": "Boerse Stuttgart",
  "country": "DE",
  "listing_tier": "secondary",
  "instrument": {"isin": "LU3192257148", "name": "ALKN Security Token", "cnad": "EAD-0029"},
  "issuer_qid": "Q139941340",
  "listing_date": "2026-06-29",
  "notional_usd": 1640000000,
  "backing": {"asset": "NP1 nickel wire", "quantity_m": 7026905, "custodian": "Helvetic Securgest"},
  "_fetched_at": "2026-09-01T17:11:35Z",
  "_stream": "A",
  "_provenance": {"phase": "F-atomic", "chain_predecessor": "aef1940793d395528529f2eb7fc63ef5d2457f5bbc89ba586d367ecbe0b5c18b"}
}