{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:3K22UKB4ZEOZA5HEK5IVASVTJZ","short_pith_number":"pith:3K22UKB4","canonical_record":{"source":{"id":"2109.08067","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2021-09-16T15:49:23Z","cross_cats_sorted":["physics.med-ph","quant-ph"],"title_canon_sha256":"7464c62029fdb61fee82fcda20d1938418cd8a6172a6d5cfafdc688252ac73ef","abstract_canon_sha256":"14de5e6f96dea6dbd42d4894fa5b9f274ba09c198fa64ec8989b7588935e90ac"},"schema_version":"1.0"},"canonical_sha256":"dab5aa283cc91d9074e45751504ab34e73429eb6c5a965498adea7c5c56eab77","source":{"kind":"arxiv","id":"2109.08067","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.08067","created_at":"2026-07-05T03:34:35Z"},{"alias_kind":"arxiv_version","alias_value":"2109.08067v1","created_at":"2026-07-05T03:34:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.08067","created_at":"2026-07-05T03:34:35Z"},{"alias_kind":"pith_short_12","alias_value":"3K22UKB4ZEOZ","created_at":"2026-07-05T03:34:35Z"},{"alias_kind":"pith_short_16","alias_value":"3K22UKB4ZEOZA5HE","created_at":"2026-07-05T03:34:35Z"},{"alias_kind":"pith_short_8","alias_value":"3K22UKB4","created_at":"2026-07-05T03:34:35Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:3K22UKB4ZEOZA5HEK5IVASVTJZ","target":"record","payload":{"canonical_record":{"source":{"id":"2109.08067","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2021-09-16T15:49:23Z","cross_cats_sorted":["physics.med-ph","quant-ph"],"title_canon_sha256":"7464c62029fdb61fee82fcda20d1938418cd8a6172a6d5cfafdc688252ac73ef","abstract_canon_sha256":"14de5e6f96dea6dbd42d4894fa5b9f274ba09c198fa64ec8989b7588935e90ac"},"schema_version":"1.0"},"canonical_sha256":"dab5aa283cc91d9074e45751504ab34e73429eb6c5a965498adea7c5c56eab77","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:34:35.255842Z","signature_b64":"00iBoLw1Ly/InQ4gQciA6+gaUC0D9B1uJG1n5Kc40NdvThR0Z3c9TIvOWVaunEttixYod18nUkyFDrlN4MaDDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dab5aa283cc91d9074e45751504ab34e73429eb6c5a965498adea7c5c56eab77","last_reissued_at":"2026-07-05T03:34:35.255427Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:34:35.255427Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2109.08067","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":"2026-07-05T03:34:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4Xzkx23X3g4LRHuDODgrzNc3g2zof3V8n/ehotIUE5xmy4Z2hsoolZdjgo0MVw8KwY71HdwsMNlfnHRrWJRuDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T17:01:25.689850Z"},"content_sha256":"2164685509741e050a28b290d4e748d431379b2e9b4fa6f8fb4991f1c43632c0","schema_version":"1.0","event_id":"sha256:2164685509741e050a28b290d4e748d431379b2e9b4fa6f8fb4991f1c43632c0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:3K22UKB4ZEOZA5HEK5IVASVTJZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"NMR of $^{31}$P Nuclear Spin Singlet States in Organic Diphosphates","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.med-ph","quant-ph"],"primary_cat":"physics.chem-ph","authors_text":"Matthew S. Rosen, Ronald L. Walsworth, Stephen J. DeVience","submitted_at":"2021-09-16T15:49:23Z","abstract_excerpt":"$^{31}$P NMR and MRI are commonly used to study organophosphates that are central to cellular energy metabolism. In some molecules of interest, such as adenosine diphosphate (ADP) and nicotinamide adenine dinucleotide (NAD), pairs of coupled $^{31}$P nuclei in the diphosphate moiety should enable the creation of nuclear spin singlet states, which may be long-lived and can be selectively detected via quantum filters. Here, we show that $^{31}$P singlet states can be created on ADP and NAD, but their lifetimes are shorter than T$_{1}$ and are strongly sensitive to pH. Nevertheless, the singlet s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.08067","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2109.08067/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":"2026-07-05T03:34:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"crledioLuPt7helK9GGpzTB9NYzRWBvj4dbs7DlFio108y9Bi0DkPWF5e5m9KINAzAiSqM2vK6PzvbYaAoItDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-06T17:01:25.690224Z"},"content_sha256":"795158931ec4c97e16f6494f166c5cce6e17ebd17bb28c1b400cb11521ba60ba","schema_version":"1.0","event_id":"sha256:795158931ec4c97e16f6494f166c5cce6e17ebd17bb28c1b400cb11521ba60ba"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3K22UKB4ZEOZA5HEK5IVASVTJZ/bundle.json","state_url":"https://pith.science/pith/3K22UKB4ZEOZA5HEK5IVASVTJZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3K22UKB4ZEOZA5HEK5IVASVTJZ/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":"2026-07-06T17:01:25Z","links":{"resolver":"https://pith.science/pith/3K22UKB4ZEOZA5HEK5IVASVTJZ","bundle":"https://pith.science/pith/3K22UKB4ZEOZA5HEK5IVASVTJZ/bundle.json","state":"https://pith.science/pith/3K22UKB4ZEOZA5HEK5IVASVTJZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3K22UKB4ZEOZA5HEK5IVASVTJZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:3K22UKB4ZEOZA5HEK5IVASVTJZ","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":"14de5e6f96dea6dbd42d4894fa5b9f274ba09c198fa64ec8989b7588935e90ac","cross_cats_sorted":["physics.med-ph","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2021-09-16T15:49:23Z","title_canon_sha256":"7464c62029fdb61fee82fcda20d1938418cd8a6172a6d5cfafdc688252ac73ef"},"schema_version":"1.0","source":{"id":"2109.08067","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.08067","created_at":"2026-07-05T03:34:35Z"},{"alias_kind":"arxiv_version","alias_value":"2109.08067v1","created_at":"2026-07-05T03:34:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.08067","created_at":"2026-07-05T03:34:35Z"},{"alias_kind":"pith_short_12","alias_value":"3K22UKB4ZEOZ","created_at":"2026-07-05T03:34:35Z"},{"alias_kind":"pith_short_16","alias_value":"3K22UKB4ZEOZA5HE","created_at":"2026-07-05T03:34:35Z"},{"alias_kind":"pith_short_8","alias_value":"3K22UKB4","created_at":"2026-07-05T03:34:35Z"}],"graph_snapshots":[{"event_id":"sha256:795158931ec4c97e16f6494f166c5cce6e17ebd17bb28c1b400cb11521ba60ba","target":"graph","created_at":"2026-07-05T03:34:35Z","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/2109.08067/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"$^{31}$P NMR and MRI are commonly used to study organophosphates that are central to cellular energy metabolism. In some molecules of interest, such as adenosine diphosphate (ADP) and nicotinamide adenine dinucleotide (NAD), pairs of coupled $^{31}$P nuclei in the diphosphate moiety should enable the creation of nuclear spin singlet states, which may be long-lived and can be selectively detected via quantum filters. Here, we show that $^{31}$P singlet states can be created on ADP and NAD, but their lifetimes are shorter than T$_{1}$ and are strongly sensitive to pH. Nevertheless, the singlet s","authors_text":"Matthew S. Rosen, Ronald L. Walsworth, Stephen J. DeVience","cross_cats":["physics.med-ph","quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2021-09-16T15:49:23Z","title":"NMR of $^{31}$P Nuclear Spin Singlet States in Organic Diphosphates"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.08067","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":"sha256:2164685509741e050a28b290d4e748d431379b2e9b4fa6f8fb4991f1c43632c0","target":"record","created_at":"2026-07-05T03:34:35Z","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":"14de5e6f96dea6dbd42d4894fa5b9f274ba09c198fa64ec8989b7588935e90ac","cross_cats_sorted":["physics.med-ph","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.chem-ph","submitted_at":"2021-09-16T15:49:23Z","title_canon_sha256":"7464c62029fdb61fee82fcda20d1938418cd8a6172a6d5cfafdc688252ac73ef"},"schema_version":"1.0","source":{"id":"2109.08067","kind":"arxiv","version":1}},"canonical_sha256":"dab5aa283cc91d9074e45751504ab34e73429eb6c5a965498adea7c5c56eab77","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dab5aa283cc91d9074e45751504ab34e73429eb6c5a965498adea7c5c56eab77","first_computed_at":"2026-07-05T03:34:35.255427Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:34:35.255427Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"00iBoLw1Ly/InQ4gQciA6+gaUC0D9B1uJG1n5Kc40NdvThR0Z3c9TIvOWVaunEttixYod18nUkyFDrlN4MaDDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T03:34:35.255842Z","signed_message":"canonical_sha256_bytes"},"source_id":"2109.08067","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2164685509741e050a28b290d4e748d431379b2e9b4fa6f8fb4991f1c43632c0","sha256:795158931ec4c97e16f6494f166c5cce6e17ebd17bb28c1b400cb11521ba60ba"],"state_sha256":"e89b0967d250e72081373b7d0cbc9eec692f05d8cb3a45bb6cd91ba679f4e9a8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oiop4b2U8jGb8+78z/CTYkp+xnGiWmpc16vrkjpsVWzfS/+GoRM8STvchmMX+rXItyBemgDusnjXhZc5LIFyBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-06T17:01:25.692136Z","bundle_sha256":"23d9d06a96f73fd54dd2bf457c9214559b51fd740aa4f63deab32e74e86cfaa4"}}