{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:WHCMAXFNOCTW23V5DB6XE4KJP3","short_pith_number":"pith:WHCMAXFN","canonical_record":{"source":{"id":"1802.08455","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-02-23T09:24:28Z","cross_cats_sorted":["astro-ph.CO","gr-qc","hep-ph","hep-th"],"title_canon_sha256":"43677983d4c1eb1cc6681b552392d49bbb9bcc6641339a6a530290cdcb3e7605","abstract_canon_sha256":"3325a66a522f0d0e342fbacded425911586195a14348e03bc4ea98158b9e5120"},"schema_version":"1.0"},"canonical_sha256":"b1c4c05cad70a76d6ebd187d7271497ef504700c9b8eddadfb94c4ac3dcc2f2e","source":{"kind":"arxiv","id":"1802.08455","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.08455","created_at":"2026-05-18T00:22:36Z"},{"alias_kind":"arxiv_version","alias_value":"1802.08455v1","created_at":"2026-05-18T00:22:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.08455","created_at":"2026-05-18T00:22:36Z"},{"alias_kind":"pith_short_12","alias_value":"WHCMAXFNOCTW","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"WHCMAXFNOCTW23V5","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"WHCMAXFN","created_at":"2026-05-18T12:32:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:WHCMAXFNOCTW23V5DB6XE4KJP3","target":"record","payload":{"canonical_record":{"source":{"id":"1802.08455","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-02-23T09:24:28Z","cross_cats_sorted":["astro-ph.CO","gr-qc","hep-ph","hep-th"],"title_canon_sha256":"43677983d4c1eb1cc6681b552392d49bbb9bcc6641339a6a530290cdcb3e7605","abstract_canon_sha256":"3325a66a522f0d0e342fbacded425911586195a14348e03bc4ea98158b9e5120"},"schema_version":"1.0"},"canonical_sha256":"b1c4c05cad70a76d6ebd187d7271497ef504700c9b8eddadfb94c4ac3dcc2f2e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:22:36.769474Z","signature_b64":"ICkn6jMzBHywH4q4T3WdnfWtkuMkwUnnbXYCSxtu02wLqLPTPjqylYeA82/9vUbiWFDfjF4+fP+couYgEyc9Ag==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b1c4c05cad70a76d6ebd187d7271497ef504700c9b8eddadfb94c4ac3dcc2f2e","last_reissued_at":"2026-05-18T00:22:36.768979Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:22:36.768979Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1802.08455","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":"2026-05-18T00:22:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NrzxZFFZ7YW0aV/1XSViYb6xMgLY6hGPOoCFtgCkVRI4C4njzYlUbbJP3LA7fi1R/zAadBQWEIYY81BG8ensBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T09:55:20.246753Z"},"content_sha256":"e79a6f1f23f3e6931fe9bfcaae6429b2146b5148797f99445279f3b8abcd865c","schema_version":"1.0","event_id":"sha256:e79a6f1f23f3e6931fe9bfcaae6429b2146b5148797f99445279f3b8abcd865c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:WHCMAXFNOCTW23V5DB6XE4KJP3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Tibet$^\\prime$s Window on Primordial Gravitational Waves","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","gr-qc","hep-ph","hep-th"],"primary_cat":"astro-ph.IM","authors_text":"Hong Li, Si-Yu Li, Xinmin Zhang, Yang Liu, Yong-Ping Li","submitted_at":"2018-02-23T09:24:28Z","abstract_excerpt":"As an essential part of Chinaâ€™s Gravitational Waves Program, the Ali CMB Polarization Telescope (AliCPT) is a ground-based experiment aiming at the Primordial Gravitational Waves (PGWs) by measuring B-mode polarization of Cosmic Microwave Background (CMB). First proposed in 2014 and currently in fast construction phase, AliCPT is Chinaâ€™s first CMB project that plans for commissioning in 2019. Led by the Institute of High Energy Physics (IHEP) under the Chinese Academy of Sciences (CAS), the project is a worldwide collaboration of more than fifteen universities and research institutes. Ali "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.08455","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":"2026-05-18T00:22:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"KuxN914LjefolAYzPxAVr9rUuHsRHqrJQTalwH5CrGV+wBa963dxK4FGM6eKZiSoQfXNPfFAaXxwUDGjk6w2Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T09:55:20.247454Z"},"content_sha256":"a375d3b639d3f6935ee2b47eb234b3a5e68ca701bf84fff52e64221db067b81e","schema_version":"1.0","event_id":"sha256:a375d3b639d3f6935ee2b47eb234b3a5e68ca701bf84fff52e64221db067b81e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WHCMAXFNOCTW23V5DB6XE4KJP3/bundle.json","state_url":"https://pith.science/pith/WHCMAXFNOCTW23V5DB6XE4KJP3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WHCMAXFNOCTW23V5DB6XE4KJP3/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":"2026-05-30T09:55:20Z","links":{"resolver":"https://pith.science/pith/WHCMAXFNOCTW23V5DB6XE4KJP3","bundle":"https://pith.science/pith/WHCMAXFNOCTW23V5DB6XE4KJP3/bundle.json","state":"https://pith.science/pith/WHCMAXFNOCTW23V5DB6XE4KJP3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WHCMAXFNOCTW23V5DB6XE4KJP3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:WHCMAXFNOCTW23V5DB6XE4KJP3","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":"3325a66a522f0d0e342fbacded425911586195a14348e03bc4ea98158b9e5120","cross_cats_sorted":["astro-ph.CO","gr-qc","hep-ph","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-02-23T09:24:28Z","title_canon_sha256":"43677983d4c1eb1cc6681b552392d49bbb9bcc6641339a6a530290cdcb3e7605"},"schema_version":"1.0","source":{"id":"1802.08455","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.08455","created_at":"2026-05-18T00:22:36Z"},{"alias_kind":"arxiv_version","alias_value":"1802.08455v1","created_at":"2026-05-18T00:22:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.08455","created_at":"2026-05-18T00:22:36Z"},{"alias_kind":"pith_short_12","alias_value":"WHCMAXFNOCTW","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"WHCMAXFNOCTW23V5","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"WHCMAXFN","created_at":"2026-05-18T12:32:59Z"}],"graph_snapshots":[{"event_id":"sha256:a375d3b639d3f6935ee2b47eb234b3a5e68ca701bf84fff52e64221db067b81e","target":"graph","created_at":"2026-05-18T00:22:36Z","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":"As an essential part of Chinaâ€™s Gravitational Waves Program, the Ali CMB Polarization Telescope (AliCPT) is a ground-based experiment aiming at the Primordial Gravitational Waves (PGWs) by measuring B-mode polarization of Cosmic Microwave Background (CMB). First proposed in 2014 and currently in fast construction phase, AliCPT is Chinaâ€™s first CMB project that plans for commissioning in 2019. Led by the Institute of High Energy Physics (IHEP) under the Chinese Academy of Sciences (CAS), the project is a worldwide collaboration of more than fifteen universities and research institutes. Ali ","authors_text":"Hong Li, Si-Yu Li, Xinmin Zhang, Yang Liu, Yong-Ping Li","cross_cats":["astro-ph.CO","gr-qc","hep-ph","hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-02-23T09:24:28Z","title":"Tibet$^\\prime$s Window on Primordial Gravitational Waves"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.08455","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:e79a6f1f23f3e6931fe9bfcaae6429b2146b5148797f99445279f3b8abcd865c","target":"record","created_at":"2026-05-18T00:22:36Z","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":"3325a66a522f0d0e342fbacded425911586195a14348e03bc4ea98158b9e5120","cross_cats_sorted":["astro-ph.CO","gr-qc","hep-ph","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2018-02-23T09:24:28Z","title_canon_sha256":"43677983d4c1eb1cc6681b552392d49bbb9bcc6641339a6a530290cdcb3e7605"},"schema_version":"1.0","source":{"id":"1802.08455","kind":"arxiv","version":1}},"canonical_sha256":"b1c4c05cad70a76d6ebd187d7271497ef504700c9b8eddadfb94c4ac3dcc2f2e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b1c4c05cad70a76d6ebd187d7271497ef504700c9b8eddadfb94c4ac3dcc2f2e","first_computed_at":"2026-05-18T00:22:36.768979Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:22:36.768979Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ICkn6jMzBHywH4q4T3WdnfWtkuMkwUnnbXYCSxtu02wLqLPTPjqylYeA82/9vUbiWFDfjF4+fP+couYgEyc9Ag==","signature_status":"signed_v1","signed_at":"2026-05-18T00:22:36.769474Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.08455","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e79a6f1f23f3e6931fe9bfcaae6429b2146b5148797f99445279f3b8abcd865c","sha256:a375d3b639d3f6935ee2b47eb234b3a5e68ca701bf84fff52e64221db067b81e"],"state_sha256":"ebefb8a9907a0f878454ed041500405ed071ddcffa4ab7364fa7fa95608b588e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Pb9iIauCZ7LyDX4fxhr9ylozmB7gjL9tcjzqjSDE07qTNv1DN4xgcH/tbswWHqpF+lE1tBa1Y42Z1Ga4ZbuwAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T09:55:20.250988Z","bundle_sha256":"40e68df0f467ed11377d36c1a63871bcfa25a667a39f54f4d73235df9525d416"}}