{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:Z4X3QZYZSO5G5HHWJXV2GHCZ5Q","short_pith_number":"pith:Z4X3QZYZ","canonical_record":{"source":{"id":"1506.01538","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-06-04T10:28:37Z","cross_cats_sorted":[],"title_canon_sha256":"f962e53b62dd8ef925dfeff53fa280f88286f9bcab8c6505bdd9d68a03f7d9f1","abstract_canon_sha256":"c8ff108df6683c934507a75a9ef6c3c486bed0dc0b2d34f63a6dd3747ba23804"},"schema_version":"1.0"},"canonical_sha256":"cf2fb8671993ba6e9cf64deba31c59ec3e3fa5dc0f3e41ee9834d5d2341504f5","source":{"kind":"arxiv","id":"1506.01538","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.01538","created_at":"2026-05-18T00:53:40Z"},{"alias_kind":"arxiv_version","alias_value":"1506.01538v2","created_at":"2026-05-18T00:53:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.01538","created_at":"2026-05-18T00:53:40Z"},{"alias_kind":"pith_short_12","alias_value":"Z4X3QZYZSO5G","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_16","alias_value":"Z4X3QZYZSO5G5HHW","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_8","alias_value":"Z4X3QZYZ","created_at":"2026-05-18T12:29:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:Z4X3QZYZSO5G5HHWJXV2GHCZ5Q","target":"record","payload":{"canonical_record":{"source":{"id":"1506.01538","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-06-04T10:28:37Z","cross_cats_sorted":[],"title_canon_sha256":"f962e53b62dd8ef925dfeff53fa280f88286f9bcab8c6505bdd9d68a03f7d9f1","abstract_canon_sha256":"c8ff108df6683c934507a75a9ef6c3c486bed0dc0b2d34f63a6dd3747ba23804"},"schema_version":"1.0"},"canonical_sha256":"cf2fb8671993ba6e9cf64deba31c59ec3e3fa5dc0f3e41ee9834d5d2341504f5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:53:40.578187Z","signature_b64":"fuvo81PLtDK+pGKOUZ0GuSGUOCAO+lSbmd0uVmqSbc9c1h8Dz+Iv1gyEuLZODql+yjjYS0CXARwhpgNVSI3TBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cf2fb8671993ba6e9cf64deba31c59ec3e3fa5dc0f3e41ee9834d5d2341504f5","last_reissued_at":"2026-05-18T00:53:40.577644Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:53:40.577644Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1506.01538","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":"2026-05-18T00:53:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"91o/iMo5kmVr8NJDF/xJ1fM23y6tT69aTF8r326IAZdejOyTGNu4o+v/LF56nI8sfunvT4oDF08gGYAAXxLJAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T20:20:54.346825Z"},"content_sha256":"7ad6e138e2e8d87a2a6c4b9cabff5510b90f3e8540ab3244e7f21675e9ce32e3","schema_version":"1.0","event_id":"sha256:7ad6e138e2e8d87a2a6c4b9cabff5510b90f3e8540ab3244e7f21675e9ce32e3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:Z4X3QZYZSO5G5HHWJXV2GHCZ5Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An Overview of High-Altitude Balloon Experiments at the Indian Institute of Astrophysics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"A. G. Sreejith, Ajin Prakash, Akshata Nayak, Jayant Murthy, Joice Mathew, K. Nirmal, Margarita Safonova, Mayuresh Sarpotdar, S. Ambily, Sameer Talnikar, Shripathy Hadigal","submitted_at":"2015-06-04T10:28:37Z","abstract_excerpt":"We have initiated the High-Altitude Ballooning programme at Indian Institute of Astrophysics, Bangalore, in the year 2011 with the primary purpose of developing and flying low-cost scientific payloads on a balloon-borne platform. The main aim is the observations of extended nearby objects (e.g. comets) and of diffuse sources (e.g. zodiacal light or airglow) with wide field of view (FOV) UV instruments from near space (20 to 30 km). A brief summary and the results of the tethered flights carried out at IIA CREST campus are given in Ref.~1. Here we present an overview of the nine free-flying bal"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.01538","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":"2026-05-18T00:53:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wmWncklyjEfBpYW8UACaJMRtqpl9n8FkUE8RsLxGkyt2IFI0j//3AncOQzmuhkqk6X835wX3At9i5c/Xag4jAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T20:20:54.347602Z"},"content_sha256":"a0d0d2bc51ebddc7bb1a17907d1a91d15a4a0042231a9c99e402add6e79db4ee","schema_version":"1.0","event_id":"sha256:a0d0d2bc51ebddc7bb1a17907d1a91d15a4a0042231a9c99e402add6e79db4ee"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Z4X3QZYZSO5G5HHWJXV2GHCZ5Q/bundle.json","state_url":"https://pith.science/pith/Z4X3QZYZSO5G5HHWJXV2GHCZ5Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Z4X3QZYZSO5G5HHWJXV2GHCZ5Q/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":"2026-05-28T20:20:54Z","links":{"resolver":"https://pith.science/pith/Z4X3QZYZSO5G5HHWJXV2GHCZ5Q","bundle":"https://pith.science/pith/Z4X3QZYZSO5G5HHWJXV2GHCZ5Q/bundle.json","state":"https://pith.science/pith/Z4X3QZYZSO5G5HHWJXV2GHCZ5Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Z4X3QZYZSO5G5HHWJXV2GHCZ5Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:Z4X3QZYZSO5G5HHWJXV2GHCZ5Q","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":"c8ff108df6683c934507a75a9ef6c3c486bed0dc0b2d34f63a6dd3747ba23804","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-06-04T10:28:37Z","title_canon_sha256":"f962e53b62dd8ef925dfeff53fa280f88286f9bcab8c6505bdd9d68a03f7d9f1"},"schema_version":"1.0","source":{"id":"1506.01538","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.01538","created_at":"2026-05-18T00:53:40Z"},{"alias_kind":"arxiv_version","alias_value":"1506.01538v2","created_at":"2026-05-18T00:53:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.01538","created_at":"2026-05-18T00:53:40Z"},{"alias_kind":"pith_short_12","alias_value":"Z4X3QZYZSO5G","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_16","alias_value":"Z4X3QZYZSO5G5HHW","created_at":"2026-05-18T12:29:52Z"},{"alias_kind":"pith_short_8","alias_value":"Z4X3QZYZ","created_at":"2026-05-18T12:29:52Z"}],"graph_snapshots":[{"event_id":"sha256:a0d0d2bc51ebddc7bb1a17907d1a91d15a4a0042231a9c99e402add6e79db4ee","target":"graph","created_at":"2026-05-18T00:53:40Z","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":"We have initiated the High-Altitude Ballooning programme at Indian Institute of Astrophysics, Bangalore, in the year 2011 with the primary purpose of developing and flying low-cost scientific payloads on a balloon-borne platform. The main aim is the observations of extended nearby objects (e.g. comets) and of diffuse sources (e.g. zodiacal light or airglow) with wide field of view (FOV) UV instruments from near space (20 to 30 km). A brief summary and the results of the tethered flights carried out at IIA CREST campus are given in Ref.~1. Here we present an overview of the nine free-flying bal","authors_text":"A. G. Sreejith, Ajin Prakash, Akshata Nayak, Jayant Murthy, Joice Mathew, K. Nirmal, Margarita Safonova, Mayuresh Sarpotdar, S. Ambily, Sameer Talnikar, Shripathy Hadigal","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-06-04T10:28:37Z","title":"An Overview of High-Altitude Balloon Experiments at the Indian Institute of Astrophysics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.01538","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":"sha256:7ad6e138e2e8d87a2a6c4b9cabff5510b90f3e8540ab3244e7f21675e9ce32e3","target":"record","created_at":"2026-05-18T00:53:40Z","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":"c8ff108df6683c934507a75a9ef6c3c486bed0dc0b2d34f63a6dd3747ba23804","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-06-04T10:28:37Z","title_canon_sha256":"f962e53b62dd8ef925dfeff53fa280f88286f9bcab8c6505bdd9d68a03f7d9f1"},"schema_version":"1.0","source":{"id":"1506.01538","kind":"arxiv","version":2}},"canonical_sha256":"cf2fb8671993ba6e9cf64deba31c59ec3e3fa5dc0f3e41ee9834d5d2341504f5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cf2fb8671993ba6e9cf64deba31c59ec3e3fa5dc0f3e41ee9834d5d2341504f5","first_computed_at":"2026-05-18T00:53:40.577644Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:53:40.577644Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fuvo81PLtDK+pGKOUZ0GuSGUOCAO+lSbmd0uVmqSbc9c1h8Dz+Iv1gyEuLZODql+yjjYS0CXARwhpgNVSI3TBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:53:40.578187Z","signed_message":"canonical_sha256_bytes"},"source_id":"1506.01538","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7ad6e138e2e8d87a2a6c4b9cabff5510b90f3e8540ab3244e7f21675e9ce32e3","sha256:a0d0d2bc51ebddc7bb1a17907d1a91d15a4a0042231a9c99e402add6e79db4ee"],"state_sha256":"9d903dfac4e924171e222fb22eaa734f9e1a36f84136cd584e43b2ddf9f93e1c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MwnZu2vCsaIJptTcsobQFjb1eiHoo5r0MD7eCOd33Mqo850PtbpiglikSeAUpi2dEu5ZqA+x9Yie9PVO1SF4AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T20:20:54.351785Z","bundle_sha256":"6c3e5969846ecc3750aeb1f91f4f602ae0c7efdc0db5d788e77a97dd1e9aee2b"}}