{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:YTTLZSNZFAJZE43TTCHFJI3TQK","short_pith_number":"pith:YTTLZSNZ","canonical_record":{"source":{"id":"1604.05660","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2016-04-13T15:15:17Z","cross_cats_sorted":[],"title_canon_sha256":"4fa6d45b8a6229c5b7a8fea41e6873fc048fddd89ad4d6f10784873ce2851163","abstract_canon_sha256":"c398c68c7dd16ac94111d4ab84b21e2fee4460ce2557fb6743a966ee526e3e76"},"schema_version":"1.0"},"canonical_sha256":"c4e6bcc9b92813927373988e54a37382bb895c629d41862e28cc69ed4f434346","source":{"kind":"arxiv","id":"1604.05660","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.05660","created_at":"2026-05-18T01:16:38Z"},{"alias_kind":"arxiv_version","alias_value":"1604.05660v1","created_at":"2026-05-18T01:16:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.05660","created_at":"2026-05-18T01:16:38Z"},{"alias_kind":"pith_short_12","alias_value":"YTTLZSNZFAJZ","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"YTTLZSNZFAJZE43T","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"YTTLZSNZ","created_at":"2026-05-18T12:30:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:YTTLZSNZFAJZE43TTCHFJI3TQK","target":"record","payload":{"canonical_record":{"source":{"id":"1604.05660","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2016-04-13T15:15:17Z","cross_cats_sorted":[],"title_canon_sha256":"4fa6d45b8a6229c5b7a8fea41e6873fc048fddd89ad4d6f10784873ce2851163","abstract_canon_sha256":"c398c68c7dd16ac94111d4ab84b21e2fee4460ce2557fb6743a966ee526e3e76"},"schema_version":"1.0"},"canonical_sha256":"c4e6bcc9b92813927373988e54a37382bb895c629d41862e28cc69ed4f434346","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:16:38.048569Z","signature_b64":"vMjan/e176Tb4JXROBwW5s/ht64bcY+AUbtWHOXpidm3aDdd3LtnQnOOHVcSKTUGLjyIrlP8BegIUQxy8KPcAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c4e6bcc9b92813927373988e54a37382bb895c629d41862e28cc69ed4f434346","last_reissued_at":"2026-05-18T01:16:38.047790Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:16:38.047790Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1604.05660","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:16:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eIcr0glRsHFhkpCExOy0Zz/Y/QFE70MosoSDijdVR4PacZapFjlg+3j6Nyagcv+r3YfP8Q64mPKn8XzqjfmaAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T07:52:39.968682Z"},"content_sha256":"877291a35b3229985e4e8b2de592733bc1b7bc370e59d0711149ce1f33b26ab5","schema_version":"1.0","event_id":"sha256:877291a35b3229985e4e8b2de592733bc1b7bc370e59d0711149ce1f33b26ab5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:YTTLZSNZFAJZE43TTCHFJI3TQK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Comment on two papers claiming records for the lowest carrier concentration at which superconductivity has been observed","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.supr-con","authors_text":"D.M. Eagles","submitted_at":"2016-04-13T15:15:17Z","abstract_excerpt":"A recent paper and a preprint both claim records for the lowest carrier concentration at which superconductivity has been observed. However colleagues in Australia and I found evidence for superconductivity at concentrations of the order of at least a hundred times lower in the 1980's, in a ceramic sample of SrTiO_3 with 3% of Ti replaced by Zr."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.05660","kind":"arxiv","version":1},"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":"2026-05-18T01:16:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PkPHMYiSAYIu2KMC5oz04KEzYB5C/w3fyCR+gIP0X/uGAGM9lsE/Qv68tfi4wE6sou/ZeCKIK8dHDYpz1e4FDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T07:52:39.969443Z"},"content_sha256":"75a32898759fe8208b37b2cd1610ef27acebb8bf9262f1f02d068f64fd2e3d8e","schema_version":"1.0","event_id":"sha256:75a32898759fe8208b37b2cd1610ef27acebb8bf9262f1f02d068f64fd2e3d8e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YTTLZSNZFAJZE43TTCHFJI3TQK/bundle.json","state_url":"https://pith.science/pith/YTTLZSNZFAJZE43TTCHFJI3TQK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YTTLZSNZFAJZE43TTCHFJI3TQK/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":"2026-06-09T07:52:39Z","links":{"resolver":"https://pith.science/pith/YTTLZSNZFAJZE43TTCHFJI3TQK","bundle":"https://pith.science/pith/YTTLZSNZFAJZE43TTCHFJI3TQK/bundle.json","state":"https://pith.science/pith/YTTLZSNZFAJZE43TTCHFJI3TQK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YTTLZSNZFAJZE43TTCHFJI3TQK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:YTTLZSNZFAJZE43TTCHFJI3TQK","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":"c398c68c7dd16ac94111d4ab84b21e2fee4460ce2557fb6743a966ee526e3e76","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2016-04-13T15:15:17Z","title_canon_sha256":"4fa6d45b8a6229c5b7a8fea41e6873fc048fddd89ad4d6f10784873ce2851163"},"schema_version":"1.0","source":{"id":"1604.05660","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1604.05660","created_at":"2026-05-18T01:16:38Z"},{"alias_kind":"arxiv_version","alias_value":"1604.05660v1","created_at":"2026-05-18T01:16:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1604.05660","created_at":"2026-05-18T01:16:38Z"},{"alias_kind":"pith_short_12","alias_value":"YTTLZSNZFAJZ","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"YTTLZSNZFAJZE43T","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"YTTLZSNZ","created_at":"2026-05-18T12:30:53Z"}],"graph_snapshots":[{"event_id":"sha256:75a32898759fe8208b37b2cd1610ef27acebb8bf9262f1f02d068f64fd2e3d8e","target":"graph","created_at":"2026-05-18T01:16:38Z","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":"A recent paper and a preprint both claim records for the lowest carrier concentration at which superconductivity has been observed. However colleagues in Australia and I found evidence for superconductivity at concentrations of the order of at least a hundred times lower in the 1980's, in a ceramic sample of SrTiO_3 with 3% of Ti replaced by Zr.","authors_text":"D.M. Eagles","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2016-04-13T15:15:17Z","title":"Comment on two papers claiming records for the lowest carrier concentration at which superconductivity has been observed"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1604.05660","kind":"arxiv","version":1},"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":"sha256:877291a35b3229985e4e8b2de592733bc1b7bc370e59d0711149ce1f33b26ab5","target":"record","created_at":"2026-05-18T01:16:38Z","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":"c398c68c7dd16ac94111d4ab84b21e2fee4460ce2557fb6743a966ee526e3e76","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.supr-con","submitted_at":"2016-04-13T15:15:17Z","title_canon_sha256":"4fa6d45b8a6229c5b7a8fea41e6873fc048fddd89ad4d6f10784873ce2851163"},"schema_version":"1.0","source":{"id":"1604.05660","kind":"arxiv","version":1}},"canonical_sha256":"c4e6bcc9b92813927373988e54a37382bb895c629d41862e28cc69ed4f434346","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c4e6bcc9b92813927373988e54a37382bb895c629d41862e28cc69ed4f434346","first_computed_at":"2026-05-18T01:16:38.047790Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:16:38.047790Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vMjan/e176Tb4JXROBwW5s/ht64bcY+AUbtWHOXpidm3aDdd3LtnQnOOHVcSKTUGLjyIrlP8BegIUQxy8KPcAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:16:38.048569Z","signed_message":"canonical_sha256_bytes"},"source_id":"1604.05660","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:877291a35b3229985e4e8b2de592733bc1b7bc370e59d0711149ce1f33b26ab5","sha256:75a32898759fe8208b37b2cd1610ef27acebb8bf9262f1f02d068f64fd2e3d8e"],"state_sha256":"a5a9cd86be89f53f4e42c983b95e3ffa2075deeb362ab26684770569c7209476"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Hgr1CRLAE82Y3ryJAYBJkqjRqWfyK2czl1JfosEr17DEZB8qmK+C4mCr3y11ogcX9DpnWADaUNDURtXvVphcCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T07:52:39.973821Z","bundle_sha256":"24f493edd39f9cc72c605db571260ef6e88c125fc21fa5e1ee83ae7e87315ea4"}}