{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"b8b594077559c139caeac6d9fd1b6c66415bed2fd652d8d40fc64decea956dad","created":"2026-10-03T07:17:50Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"4fa2f87cdbebe82be362dc8fc85a05786a69cc9f91bcc114b2d931e2cb634ef9","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"astro.first-smbh","field":"astro","n":"1","review_cite":"K. Inayoshi, E. Visbal, Z. Haiman, The Assembly of the First Massive Black Holes, Annual Review of Astronomy and Astrophysics, 2020","review_link":"https://doi.org/10.1146/annurev-astro-120419-014455","review_verified":"true","summary":"Black holes of a billion solar masses already powered quasars less than a billion years after the Big Bang, and JWST now sees many smaller ones even earlier. Nobody knows what the first seed black holes were or how they grew so fast.","title":"Formation of the first supermassive black holes","topic_ref":null,"why":"The growth of the first black holes tests accretion physics and shapes how the first galaxies formed."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"b31645054af13e29c5201707761f4cbb39ef8dced934561a5f80d1a755665bcf","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"ee2b01d2a38f54d9f3bea4279ee314a95818e8de1dfe3f171831f37eebc8ad20","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"7ch4LNg6cgpJJajq_NmmnmbPQ5Lfg5XgADuYVKBC9-e6Edx0yqWwGdzFjThj_wgmkWVoydFGWJvaFlKnLM-wCg"},"schema":"pubphys.envelope/1"},"record_hash":"b31645054af13e29c5201707761f4cbb39ef8dced934561a5f80d1a755665bcf","leaf_index":37}