{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:KQFK5M2ZU3JSUWBIFBPRYZ4OIB","short_pith_number":"pith:KQFK5M2Z","canonical_record":{"source":{"id":"2002.11418","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2020-02-26T11:40:26Z","cross_cats_sorted":[],"title_canon_sha256":"86632e61a8ae2d7d0f50f0424f165651ff0d9149352109db7e5782e8ebbc3a29","abstract_canon_sha256":"0e830ba66b8bc91a6e881cecb80b4b87623a4199f85d99dd709fdc96ea3e9b93"},"schema_version":"1.0"},"canonical_sha256":"540aaeb359a6d32a5828285f1c678e4065eb53d2c8c5c8956d333fe362073971","source":{"kind":"arxiv","id":"2002.11418","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2002.11418","created_at":"2026-07-05T01:29:54Z"},{"alias_kind":"arxiv_version","alias_value":"2002.11418v2","created_at":"2026-07-05T01:29:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2002.11418","created_at":"2026-07-05T01:29:54Z"},{"alias_kind":"pith_short_12","alias_value":"KQFK5M2ZU3JS","created_at":"2026-07-05T01:29:54Z"},{"alias_kind":"pith_short_16","alias_value":"KQFK5M2ZU3JSUWBI","created_at":"2026-07-05T01:29:54Z"},{"alias_kind":"pith_short_8","alias_value":"KQFK5M2Z","created_at":"2026-07-05T01:29:54Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:KQFK5M2ZU3JSUWBIFBPRYZ4OIB","target":"record","payload":{"canonical_record":{"source":{"id":"2002.11418","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2020-02-26T11:40:26Z","cross_cats_sorted":[],"title_canon_sha256":"86632e61a8ae2d7d0f50f0424f165651ff0d9149352109db7e5782e8ebbc3a29","abstract_canon_sha256":"0e830ba66b8bc91a6e881cecb80b4b87623a4199f85d99dd709fdc96ea3e9b93"},"schema_version":"1.0"},"canonical_sha256":"540aaeb359a6d32a5828285f1c678e4065eb53d2c8c5c8956d333fe362073971","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:29:54.756974Z","signature_b64":"zwljenbD6tLNfVw9ZVNGthTZb952Bm4UIDqtoMWDWdkLz97Kv6Yf84WOV3XAbnakrtUKhYKxVBlrXOw1vVOXAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"540aaeb359a6d32a5828285f1c678e4065eb53d2c8c5c8956d333fe362073971","last_reissued_at":"2026-07-05T01:29:54.756352Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:29:54.756352Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2002.11418","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":"2026-07-05T01:29:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"No1NozPqZ5NPyqU4TZVpU5AtZEs/00UWwp/hBPibtGOUzW6MD0jdiyO0yAmSg4XAV1ikGkfcpZHoKJXEpbGZDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T02:48:59.265850Z"},"content_sha256":"b89beba422c8b4496eb1106f955676fa99588a152912cf12efb9ae207e34a7ca","schema_version":"1.0","event_id":"sha256:b89beba422c8b4496eb1106f955676fa99588a152912cf12efb9ae207e34a7ca"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:KQFK5M2ZU3JSUWBIFBPRYZ4OIB","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The electron affinity of astatine","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.atom-ph","authors_text":"Adam Vernon, Agota Koszorus, Anastasia Borschevsky, Annie Ringvall-Moberg, Bruce Marsh, Camilo Granados, Dag Hanstorp, David Leimbach, Dmitry Fedorov, Dominik Studer, Ephraim Eliav, Eric Renault, Ferran Boix Pamies, Jakob Welander, Jessica Warbinek, Joao Pedro Ramos, Jochen Ballof, Julia Sundberg, Karl Johnston, Katerina Chrysalidis, Klaus Wendt, Lars Bengtsson, Lukas F. Pasteka, Mikael Reponen, Moa K. Kristiansson, Nicolas Galland, Oliver Forstner, Pavel Molkanov, Ralf Erik Rossel, Reinhard Heinke, Rizwan Ahmed, Ronald Fernando Garcia Ruiz, Sebastian Rothe, Shane Wilkins, Ulli Koester, Valentin Fedosseev, Yangyang Guo, Yuan Liu","submitted_at":"2020-02-26T11:40:26Z","abstract_excerpt":"One of the most important properties influencing the chemical behavior of an element is the energy released with the addition of an extra electron to the neutral atom, referred to as the electron affinity (EA). Among the remaining elements with unknown EA is astatine, the purely radioactive element 85. Astatine is the heaviest naturally occurring halogen and its isotope $^{211}$At is remarkably well suited for targeted radionuclide therapy of cancer. With the At$^-$ anion being involved in many aspects of current astatine labelling protocols, the knowledge of the electron affinity of this elem"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2002.11418","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2002.11418/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T01:29:54Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kXOH/ExwJsmuIZ7fQzvnqVVJBKKVIN/gRSHG6bR3mmZh9fngWvobUEuE9EB/xAAgGJVLRkpiCOsClYk4qo1ZBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-19T02:48:59.266360Z"},"content_sha256":"45ed3cd3718d8ea85afc2c6e8b566b36095394bdfd41eed70ff940f14e33c9b1","schema_version":"1.0","event_id":"sha256:45ed3cd3718d8ea85afc2c6e8b566b36095394bdfd41eed70ff940f14e33c9b1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KQFK5M2ZU3JSUWBIFBPRYZ4OIB/bundle.json","state_url":"https://pith.science/pith/KQFK5M2ZU3JSUWBIFBPRYZ4OIB/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KQFK5M2ZU3JSUWBIFBPRYZ4OIB/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":"2026-08-19T02:48:59Z","links":{"resolver":"https://pith.science/pith/KQFK5M2ZU3JSUWBIFBPRYZ4OIB","bundle":"https://pith.science/pith/KQFK5M2ZU3JSUWBIFBPRYZ4OIB/bundle.json","state":"https://pith.science/pith/KQFK5M2ZU3JSUWBIFBPRYZ4OIB/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KQFK5M2ZU3JSUWBIFBPRYZ4OIB/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:KQFK5M2ZU3JSUWBIFBPRYZ4OIB","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":"0e830ba66b8bc91a6e881cecb80b4b87623a4199f85d99dd709fdc96ea3e9b93","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2020-02-26T11:40:26Z","title_canon_sha256":"86632e61a8ae2d7d0f50f0424f165651ff0d9149352109db7e5782e8ebbc3a29"},"schema_version":"1.0","source":{"id":"2002.11418","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2002.11418","created_at":"2026-07-05T01:29:54Z"},{"alias_kind":"arxiv_version","alias_value":"2002.11418v2","created_at":"2026-07-05T01:29:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2002.11418","created_at":"2026-07-05T01:29:54Z"},{"alias_kind":"pith_short_12","alias_value":"KQFK5M2ZU3JS","created_at":"2026-07-05T01:29:54Z"},{"alias_kind":"pith_short_16","alias_value":"KQFK5M2ZU3JSUWBI","created_at":"2026-07-05T01:29:54Z"},{"alias_kind":"pith_short_8","alias_value":"KQFK5M2Z","created_at":"2026-07-05T01:29:54Z"}],"graph_snapshots":[{"event_id":"sha256:45ed3cd3718d8ea85afc2c6e8b566b36095394bdfd41eed70ff940f14e33c9b1","target":"graph","created_at":"2026-07-05T01:29:54Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2002.11418/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"One of the most important properties influencing the chemical behavior of an element is the energy released with the addition of an extra electron to the neutral atom, referred to as the electron affinity (EA). Among the remaining elements with unknown EA is astatine, the purely radioactive element 85. Astatine is the heaviest naturally occurring halogen and its isotope $^{211}$At is remarkably well suited for targeted radionuclide therapy of cancer. With the At$^-$ anion being involved in many aspects of current astatine labelling protocols, the knowledge of the electron affinity of this elem","authors_text":"Adam Vernon, Agota Koszorus, Anastasia Borschevsky, Annie Ringvall-Moberg, Bruce Marsh, Camilo Granados, Dag Hanstorp, David Leimbach, Dmitry Fedorov, Dominik Studer, Ephraim Eliav, Eric Renault, Ferran Boix Pamies, Jakob Welander, Jessica Warbinek, Joao Pedro Ramos, Jochen Ballof, Julia Sundberg, Karl Johnston, Katerina Chrysalidis, Klaus Wendt, Lars Bengtsson, Lukas F. Pasteka, Mikael Reponen, Moa K. Kristiansson, Nicolas Galland, Oliver Forstner, Pavel Molkanov, Ralf Erik Rossel, Reinhard Heinke, Rizwan Ahmed, Ronald Fernando Garcia Ruiz, Sebastian Rothe, Shane Wilkins, Ulli Koester, Valentin Fedosseev, Yangyang Guo, Yuan Liu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2020-02-26T11:40:26Z","title":"The electron affinity of astatine"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2002.11418","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:b89beba422c8b4496eb1106f955676fa99588a152912cf12efb9ae207e34a7ca","target":"record","created_at":"2026-07-05T01:29:54Z","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":"0e830ba66b8bc91a6e881cecb80b4b87623a4199f85d99dd709fdc96ea3e9b93","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.atom-ph","submitted_at":"2020-02-26T11:40:26Z","title_canon_sha256":"86632e61a8ae2d7d0f50f0424f165651ff0d9149352109db7e5782e8ebbc3a29"},"schema_version":"1.0","source":{"id":"2002.11418","kind":"arxiv","version":2}},"canonical_sha256":"540aaeb359a6d32a5828285f1c678e4065eb53d2c8c5c8956d333fe362073971","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"540aaeb359a6d32a5828285f1c678e4065eb53d2c8c5c8956d333fe362073971","first_computed_at":"2026-07-05T01:29:54.756352Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:29:54.756352Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zwljenbD6tLNfVw9ZVNGthTZb952Bm4UIDqtoMWDWdkLz97Kv6Yf84WOV3XAbnakrtUKhYKxVBlrXOw1vVOXAw==","signature_status":"signed_v1","signed_at":"2026-07-05T01:29:54.756974Z","signed_message":"canonical_sha256_bytes"},"source_id":"2002.11418","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b89beba422c8b4496eb1106f955676fa99588a152912cf12efb9ae207e34a7ca","sha256:45ed3cd3718d8ea85afc2c6e8b566b36095394bdfd41eed70ff940f14e33c9b1"],"state_sha256":"93e886d3a989b861e7811c8ea66f9999425b3b1b5cbd0fbc0988657a87016d40"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DrW2U0gJzWWzyLAOIaAaCa7lBlrIAbkyr0himQG2hNHINknS46tXqVSRSwrC80DJxvCzo54b0lAOktd39cwGDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-19T02:48:59.271929Z","bundle_sha256":"e02823293508407e096fb6d4f4b43928110ac9d63da847bfc78f7b69dec5d039"}}