{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:YZ2KL6GXJ5TFAX52PY5ME5QRYL","short_pith_number":"pith:YZ2KL6GX","canonical_record":{"source":{"id":"1708.05906","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-08-19T22:34:26Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"366468fe10b779256f8da3ab895842878bb8a50226edf5e3e3fb70b5a9b5de22","abstract_canon_sha256":"785ca214b97d0e25c96d371cd1412fdf6c83e21c37ea49bf3f62d17e8f507031"},"schema_version":"1.0"},"canonical_sha256":"c674a5f8d74f66505fba7e3ac27611c2d08a2a5f8118903fb3ec34a1142b887e","source":{"kind":"arxiv","id":"1708.05906","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.05906","created_at":"2026-05-18T00:16:31Z"},{"alias_kind":"arxiv_version","alias_value":"1708.05906v2","created_at":"2026-05-18T00:16:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.05906","created_at":"2026-05-18T00:16:31Z"},{"alias_kind":"pith_short_12","alias_value":"YZ2KL6GXJ5TF","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_16","alias_value":"YZ2KL6GXJ5TFAX52","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_8","alias_value":"YZ2KL6GX","created_at":"2026-05-18T12:31:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:YZ2KL6GXJ5TFAX52PY5ME5QRYL","target":"record","payload":{"canonical_record":{"source":{"id":"1708.05906","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-08-19T22:34:26Z","cross_cats_sorted":["cond-mat.mes-hall"],"title_canon_sha256":"366468fe10b779256f8da3ab895842878bb8a50226edf5e3e3fb70b5a9b5de22","abstract_canon_sha256":"785ca214b97d0e25c96d371cd1412fdf6c83e21c37ea49bf3f62d17e8f507031"},"schema_version":"1.0"},"canonical_sha256":"c674a5f8d74f66505fba7e3ac27611c2d08a2a5f8118903fb3ec34a1142b887e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:16:31.592536Z","signature_b64":"gNlquFZdtawlKOiROcYvrk6U/JCA2pDi2hSrq99B8LtBG2monND7WbA4+KIrBy5XRLf3PX6dqz8JHA8FJE4nCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c674a5f8d74f66505fba7e3ac27611c2d08a2a5f8118903fb3ec34a1142b887e","last_reissued_at":"2026-05-18T00:16:31.592064Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:16:31.592064Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1708.05906","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":"2026-05-18T00:16:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/3OG4U6z1v6Nc0a9FHW9nB3KS60W53/nh5sueX4MpdMDpaaa+Zfq3ob9ARmyAUFrEtJRBcHn3vkxy6rIAoXKAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T11:38:13.948667Z"},"content_sha256":"c4744949479ada5e00b344182e1c76c3e2eddb701f275dc9537fb39d14b1d3bd","schema_version":"1.0","event_id":"sha256:c4744949479ada5e00b344182e1c76c3e2eddb701f275dc9537fb39d14b1d3bd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:YZ2KL6GXJ5TFAX52PY5ME5QRYL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Quantum probe hyperpolarisation of molecular nuclear spins","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mes-hall"],"primary_cat":"quant-ph","authors_text":"Alastair Stacey, David A. Broadway, David A. Simpson, James D. A. Wood, Jean-Philippe Tetienne, Liam T. Hall, Lloyd C. L. Hollenberg","submitted_at":"2017-08-19T22:34:26Z","abstract_excerpt":"The hyperpolarisation of nuclear spins within target molecules is a critical and complex challenge in magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR) spectroscopy. Hyperpolarisation offers enormous gains in signal and spatial resolution which may ultimately lead to the development of molecular MRI and NMR. At present, techniques used to polarise nuclear spins generally require low temperatures and/or high magnetic fields, radio-frequency control fields, or the introduction of catalysts or free-radical mediators. The emergence of room temperature solid-state spin qubits ha"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.05906","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":"2026-05-18T00:16:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m8NxPiOo8lNZer5Wegji/EmlcfWjhKhG+rlTlnn2zewowzarnLVg5AlV+pV/NVV8d1T3417OSh1AYvq26rB4DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T11:38:13.949194Z"},"content_sha256":"9ee93aebbcc095311c1b23163f400cb0fe00ca5e8bab3e39d7a5d35c393f0759","schema_version":"1.0","event_id":"sha256:9ee93aebbcc095311c1b23163f400cb0fe00ca5e8bab3e39d7a5d35c393f0759"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YZ2KL6GXJ5TFAX52PY5ME5QRYL/bundle.json","state_url":"https://pith.science/pith/YZ2KL6GXJ5TFAX52PY5ME5QRYL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YZ2KL6GXJ5TFAX52PY5ME5QRYL/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":"2026-06-01T11:38:13Z","links":{"resolver":"https://pith.science/pith/YZ2KL6GXJ5TFAX52PY5ME5QRYL","bundle":"https://pith.science/pith/YZ2KL6GXJ5TFAX52PY5ME5QRYL/bundle.json","state":"https://pith.science/pith/YZ2KL6GXJ5TFAX52PY5ME5QRYL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YZ2KL6GXJ5TFAX52PY5ME5QRYL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:YZ2KL6GXJ5TFAX52PY5ME5QRYL","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":"785ca214b97d0e25c96d371cd1412fdf6c83e21c37ea49bf3f62d17e8f507031","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-08-19T22:34:26Z","title_canon_sha256":"366468fe10b779256f8da3ab895842878bb8a50226edf5e3e3fb70b5a9b5de22"},"schema_version":"1.0","source":{"id":"1708.05906","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.05906","created_at":"2026-05-18T00:16:31Z"},{"alias_kind":"arxiv_version","alias_value":"1708.05906v2","created_at":"2026-05-18T00:16:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.05906","created_at":"2026-05-18T00:16:31Z"},{"alias_kind":"pith_short_12","alias_value":"YZ2KL6GXJ5TF","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_16","alias_value":"YZ2KL6GXJ5TFAX52","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_8","alias_value":"YZ2KL6GX","created_at":"2026-05-18T12:31:59Z"}],"graph_snapshots":[{"event_id":"sha256:9ee93aebbcc095311c1b23163f400cb0fe00ca5e8bab3e39d7a5d35c393f0759","target":"graph","created_at":"2026-05-18T00:16:31Z","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":"The hyperpolarisation of nuclear spins within target molecules is a critical and complex challenge in magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR) spectroscopy. Hyperpolarisation offers enormous gains in signal and spatial resolution which may ultimately lead to the development of molecular MRI and NMR. At present, techniques used to polarise nuclear spins generally require low temperatures and/or high magnetic fields, radio-frequency control fields, or the introduction of catalysts or free-radical mediators. The emergence of room temperature solid-state spin qubits ha","authors_text":"Alastair Stacey, David A. Broadway, David A. Simpson, James D. A. Wood, Jean-Philippe Tetienne, Liam T. Hall, Lloyd C. L. Hollenberg","cross_cats":["cond-mat.mes-hall"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-08-19T22:34:26Z","title":"Quantum probe hyperpolarisation of molecular nuclear spins"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.05906","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:c4744949479ada5e00b344182e1c76c3e2eddb701f275dc9537fb39d14b1d3bd","target":"record","created_at":"2026-05-18T00:16:31Z","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":"785ca214b97d0e25c96d371cd1412fdf6c83e21c37ea49bf3f62d17e8f507031","cross_cats_sorted":["cond-mat.mes-hall"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2017-08-19T22:34:26Z","title_canon_sha256":"366468fe10b779256f8da3ab895842878bb8a50226edf5e3e3fb70b5a9b5de22"},"schema_version":"1.0","source":{"id":"1708.05906","kind":"arxiv","version":2}},"canonical_sha256":"c674a5f8d74f66505fba7e3ac27611c2d08a2a5f8118903fb3ec34a1142b887e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c674a5f8d74f66505fba7e3ac27611c2d08a2a5f8118903fb3ec34a1142b887e","first_computed_at":"2026-05-18T00:16:31.592064Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:16:31.592064Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"gNlquFZdtawlKOiROcYvrk6U/JCA2pDi2hSrq99B8LtBG2monND7WbA4+KIrBy5XRLf3PX6dqz8JHA8FJE4nCg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:16:31.592536Z","signed_message":"canonical_sha256_bytes"},"source_id":"1708.05906","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c4744949479ada5e00b344182e1c76c3e2eddb701f275dc9537fb39d14b1d3bd","sha256:9ee93aebbcc095311c1b23163f400cb0fe00ca5e8bab3e39d7a5d35c393f0759"],"state_sha256":"5250cab77f5003dcff7665b989e4be19f0b2edf63d7db94168ecaf13a4ab8744"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dIza4UAmdWJ751LmS9GEvUI8EmW24DK5kanw7ClSI2Fitqpgz00n3A8PzrkCwB8xpEckdgSfe/lokVXeE6kFCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T11:38:13.951959Z","bundle_sha256":"0444e1465c5fd80516a4e3e981a9610f52413c4e32241bb90506fb0eeacaa213"}}