{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:5TWFYN6TNWPI42RQGIJCFKWPWL","short_pith_number":"pith:5TWFYN6T","canonical_record":{"source":{"id":"1312.6698","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-12-23T21:10:40Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"389bb31501c98f815bbc93e31250c823ed199b5064a922f5b5d06448e13dc776","abstract_canon_sha256":"8fe3285bf550be92931c70bec9e43ab9aad5b7833b94e78c89c0736c8b419655"},"schema_version":"1.0"},"canonical_sha256":"ecec5c37d36d9e8e6a30321222aacfb2f5149f3006a83190ee3323514504d53c","source":{"kind":"arxiv","id":"1312.6698","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1312.6698","created_at":"2026-05-18T02:47:07Z"},{"alias_kind":"arxiv_version","alias_value":"1312.6698v2","created_at":"2026-05-18T02:47:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1312.6698","created_at":"2026-05-18T02:47:07Z"},{"alias_kind":"pith_short_12","alias_value":"5TWFYN6TNWPI","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_16","alias_value":"5TWFYN6TNWPI42RQ","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_8","alias_value":"5TWFYN6T","created_at":"2026-05-18T12:27:34Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:5TWFYN6TNWPI42RQGIJCFKWPWL","target":"record","payload":{"canonical_record":{"source":{"id":"1312.6698","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-12-23T21:10:40Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"389bb31501c98f815bbc93e31250c823ed199b5064a922f5b5d06448e13dc776","abstract_canon_sha256":"8fe3285bf550be92931c70bec9e43ab9aad5b7833b94e78c89c0736c8b419655"},"schema_version":"1.0"},"canonical_sha256":"ecec5c37d36d9e8e6a30321222aacfb2f5149f3006a83190ee3323514504d53c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:47:07.619726Z","signature_b64":"xATex2jAIwteawOnCblFV2fafHmvtkIQW8SjpLf1hQM2yqPgDRKCdYnkVziM58E1rzuzDTzSC29cIj9yrId3DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ecec5c37d36d9e8e6a30321222aacfb2f5149f3006a83190ee3323514504d53c","last_reissued_at":"2026-05-18T02:47:07.619370Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:47:07.619370Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1312.6698","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:47:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KvUv2CjdL/6lNPxiNNSTJ/vEuCiHdQLIMVehxtlax3jp67cyYvQHYYNJ2Xy5TRAgNy1b3PtKxjVheMZ//yUaCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T02:46:44.513879Z"},"content_sha256":"757889b55f6a69024567755d5625917f29b57e56fac033b520ccc74b558561cb","schema_version":"1.0","event_id":"sha256:757889b55f6a69024567755d5625917f29b57e56fac033b520ccc74b558561cb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:5TWFYN6TNWPI42RQGIJCFKWPWL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Observational Evidence for Black Holes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph.HE","authors_text":"Jeffrey E. McClintock, Ramesh Narayan","submitted_at":"2013-12-23T21:10:40Z","abstract_excerpt":"Astronomers have discovered two populations of black holes: (i) stellar-mass black holes with masses in the range 5 to 30 solar masses, millions of which are present in each galaxy in the universe, and (ii) supermassive black holes with masses in the range 10^6 to 10^{10} solar masses, one each in the nucleus of every galaxy. There is strong circumstantial evidence that all these objects are true black holes with event horizons. The measured masses of supermassive black hole are strongly correlated with properties of their host galaxies, suggesting that these black holes, although extremely sm"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1312.6698","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:47:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8WUHNNcXuhOQn/zJ/MQtZ1RNXcJ6RVYcyBaDc9qI8zyAkZrDmyGSCBtFyv64Da4JjvT0ebag98hAPKmHPhVUAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T02:46:44.514638Z"},"content_sha256":"f6af20607a1d079ca283a44514ef1a9876bb45712abad02b5488452c2903a6bf","schema_version":"1.0","event_id":"sha256:f6af20607a1d079ca283a44514ef1a9876bb45712abad02b5488452c2903a6bf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5TWFYN6TNWPI42RQGIJCFKWPWL/bundle.json","state_url":"https://pith.science/pith/5TWFYN6TNWPI42RQGIJCFKWPWL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5TWFYN6TNWPI42RQGIJCFKWPWL/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-10T02:46:44Z","links":{"resolver":"https://pith.science/pith/5TWFYN6TNWPI42RQGIJCFKWPWL","bundle":"https://pith.science/pith/5TWFYN6TNWPI42RQGIJCFKWPWL/bundle.json","state":"https://pith.science/pith/5TWFYN6TNWPI42RQGIJCFKWPWL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5TWFYN6TNWPI42RQGIJCFKWPWL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:5TWFYN6TNWPI42RQGIJCFKWPWL","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"8fe3285bf550be92931c70bec9e43ab9aad5b7833b94e78c89c0736c8b419655","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-12-23T21:10:40Z","title_canon_sha256":"389bb31501c98f815bbc93e31250c823ed199b5064a922f5b5d06448e13dc776"},"schema_version":"1.0","source":{"id":"1312.6698","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1312.6698","created_at":"2026-05-18T02:47:07Z"},{"alias_kind":"arxiv_version","alias_value":"1312.6698v2","created_at":"2026-05-18T02:47:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1312.6698","created_at":"2026-05-18T02:47:07Z"},{"alias_kind":"pith_short_12","alias_value":"5TWFYN6TNWPI","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_16","alias_value":"5TWFYN6TNWPI42RQ","created_at":"2026-05-18T12:27:34Z"},{"alias_kind":"pith_short_8","alias_value":"5TWFYN6T","created_at":"2026-05-18T12:27:34Z"}],"graph_snapshots":[{"event_id":"sha256:f6af20607a1d079ca283a44514ef1a9876bb45712abad02b5488452c2903a6bf","target":"graph","created_at":"2026-05-18T02:47:07Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"Astronomers have discovered two populations of black holes: (i) stellar-mass black holes with masses in the range 5 to 30 solar masses, millions of which are present in each galaxy in the universe, and (ii) supermassive black holes with masses in the range 10^6 to 10^{10} solar masses, one each in the nucleus of every galaxy. There is strong circumstantial evidence that all these objects are true black holes with event horizons. The measured masses of supermassive black hole are strongly correlated with properties of their host galaxies, suggesting that these black holes, although extremely sm","authors_text":"Jeffrey E. McClintock, Ramesh Narayan","cross_cats":["gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-12-23T21:10:40Z","title":"Observational Evidence for Black Holes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1312.6698","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:757889b55f6a69024567755d5625917f29b57e56fac033b520ccc74b558561cb","target":"record","created_at":"2026-05-18T02:47:07Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"8fe3285bf550be92931c70bec9e43ab9aad5b7833b94e78c89c0736c8b419655","cross_cats_sorted":["gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-12-23T21:10:40Z","title_canon_sha256":"389bb31501c98f815bbc93e31250c823ed199b5064a922f5b5d06448e13dc776"},"schema_version":"1.0","source":{"id":"1312.6698","kind":"arxiv","version":2}},"canonical_sha256":"ecec5c37d36d9e8e6a30321222aacfb2f5149f3006a83190ee3323514504d53c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ecec5c37d36d9e8e6a30321222aacfb2f5149f3006a83190ee3323514504d53c","first_computed_at":"2026-05-18T02:47:07.619370Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:47:07.619370Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xATex2jAIwteawOnCblFV2fafHmvtkIQW8SjpLf1hQM2yqPgDRKCdYnkVziM58E1rzuzDTzSC29cIj9yrId3DA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:47:07.619726Z","signed_message":"canonical_sha256_bytes"},"source_id":"1312.6698","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:757889b55f6a69024567755d5625917f29b57e56fac033b520ccc74b558561cb","sha256:f6af20607a1d079ca283a44514ef1a9876bb45712abad02b5488452c2903a6bf"],"state_sha256":"5d17dfe56983ac12171e7d34542819eaf7774771525ab70e7378bd579b84e287"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4xZaLS58DvEywW05CWiuu8GYFFOSx9ABzG5i+YQX4UYVSgVTuMX0HFC6spKCUXBDT6tEej211cWu4CBcbtfQDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-10T02:46:44.518563Z","bundle_sha256":"8479210634775f92193311f4997e2727153f65f33bdfe8920840d707d9bd8aa2"}}