{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:YWHIA57TJ2BNAJK4OVSMRLP6XG","short_pith_number":"pith:YWHIA57T","canonical_record":{"source":{"id":"1801.04151","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-01-12T12:45:59Z","cross_cats_sorted":[],"title_canon_sha256":"63c2ab322fd0d7b28849ac94323605c7b1b0cee098fe932e5b38b8c29b0a05df","abstract_canon_sha256":"db4c7af7b939b60010a8ab7fed1649b5276a9dfd2d641c037180ea8b805cf0f5"},"schema_version":"1.0"},"canonical_sha256":"c58e8077f34e82d0255c7564c8adfeb9b48e115fc956bf876ccfd7e6dfca4536","source":{"kind":"arxiv","id":"1801.04151","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.04151","created_at":"2026-05-18T00:00:22Z"},{"alias_kind":"arxiv_version","alias_value":"1801.04151v1","created_at":"2026-05-18T00:00:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.04151","created_at":"2026-05-18T00:00:22Z"},{"alias_kind":"pith_short_12","alias_value":"YWHIA57TJ2BN","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"YWHIA57TJ2BNAJK4","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"YWHIA57T","created_at":"2026-05-18T12:33:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:YWHIA57TJ2BNAJK4OVSMRLP6XG","target":"record","payload":{"canonical_record":{"source":{"id":"1801.04151","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-01-12T12:45:59Z","cross_cats_sorted":[],"title_canon_sha256":"63c2ab322fd0d7b28849ac94323605c7b1b0cee098fe932e5b38b8c29b0a05df","abstract_canon_sha256":"db4c7af7b939b60010a8ab7fed1649b5276a9dfd2d641c037180ea8b805cf0f5"},"schema_version":"1.0"},"canonical_sha256":"c58e8077f34e82d0255c7564c8adfeb9b48e115fc956bf876ccfd7e6dfca4536","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:00:22.089439Z","signature_b64":"k1zmSUBTF6WETCzhURQmrYbz3MppED1fnr1PXFGKT6o8JGeVVxZ633uDS4O+TCXsZIQMDRuxicJpwgzvHwnhAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c58e8077f34e82d0255c7564c8adfeb9b48e115fc956bf876ccfd7e6dfca4536","last_reissued_at":"2026-05-18T00:00:22.088833Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:00:22.088833Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1801.04151","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":"2026-05-18T00:00:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CwrRgVuIR3xZAzmWq5zADMPS0ZgxeWqmKJTibU/Ly02+nH6FY/jbbBynT8XGMHvPHcglaKHdaOHH7tRzFaynBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-02T20:17:51.828448Z"},"content_sha256":"470f51f71562304a5e76a6329e092cdbb536e3d6e8d5d26cf0f14bac24b1e915","schema_version":"1.0","event_id":"sha256:470f51f71562304a5e76a6329e092cdbb536e3d6e8d5d26cf0f14bac24b1e915"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:YWHIA57TJ2BNAJK4OVSMRLP6XG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"pySPT: a package dedicated to the source position transformation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Bastian Orthen, Olivier Wertz","submitted_at":"2018-01-12T12:45:59Z","abstract_excerpt":"The modern time-delay cosmography aims to infer the cosmological parameters with a competitive precision from observing a multiply imaged quasar. The success of this technique relies upon a robust modeling of the lens mass distribution. Unfortunately strong degeneracies between density profiles that lead to almost the same lensing observables may bias precise estimate for the Hubble constant. The source position transformation (SPT), which covers the well-known mass sheet transformation (MST) as a special case, defines a new framework to investigate these degeneracies. In this paper, we presen"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.04151","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":"2026-05-18T00:00:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"13EPdD2D9rp1Ch9znbCZW5OeZpM2Hf/4rjvnABMCuBshZ46XOsRK7Joc+Ph5ZEerFSXcgkTNURGnmryPksY7DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-02T20:17:51.828786Z"},"content_sha256":"2ae9d9dc24080b572f210ed656585dbf1c47b9cb6575c68676a5fe888fb201fd","schema_version":"1.0","event_id":"sha256:2ae9d9dc24080b572f210ed656585dbf1c47b9cb6575c68676a5fe888fb201fd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YWHIA57TJ2BNAJK4OVSMRLP6XG/bundle.json","state_url":"https://pith.science/pith/YWHIA57TJ2BNAJK4OVSMRLP6XG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YWHIA57TJ2BNAJK4OVSMRLP6XG/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":"2026-07-02T20:17:51Z","links":{"resolver":"https://pith.science/pith/YWHIA57TJ2BNAJK4OVSMRLP6XG","bundle":"https://pith.science/pith/YWHIA57TJ2BNAJK4OVSMRLP6XG/bundle.json","state":"https://pith.science/pith/YWHIA57TJ2BNAJK4OVSMRLP6XG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YWHIA57TJ2BNAJK4OVSMRLP6XG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:YWHIA57TJ2BNAJK4OVSMRLP6XG","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":"db4c7af7b939b60010a8ab7fed1649b5276a9dfd2d641c037180ea8b805cf0f5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-01-12T12:45:59Z","title_canon_sha256":"63c2ab322fd0d7b28849ac94323605c7b1b0cee098fe932e5b38b8c29b0a05df"},"schema_version":"1.0","source":{"id":"1801.04151","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1801.04151","created_at":"2026-05-18T00:00:22Z"},{"alias_kind":"arxiv_version","alias_value":"1801.04151v1","created_at":"2026-05-18T00:00:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1801.04151","created_at":"2026-05-18T00:00:22Z"},{"alias_kind":"pith_short_12","alias_value":"YWHIA57TJ2BN","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_16","alias_value":"YWHIA57TJ2BNAJK4","created_at":"2026-05-18T12:33:04Z"},{"alias_kind":"pith_short_8","alias_value":"YWHIA57T","created_at":"2026-05-18T12:33:04Z"}],"graph_snapshots":[{"event_id":"sha256:2ae9d9dc24080b572f210ed656585dbf1c47b9cb6575c68676a5fe888fb201fd","target":"graph","created_at":"2026-05-18T00:00:22Z","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 modern time-delay cosmography aims to infer the cosmological parameters with a competitive precision from observing a multiply imaged quasar. The success of this technique relies upon a robust modeling of the lens mass distribution. Unfortunately strong degeneracies between density profiles that lead to almost the same lensing observables may bias precise estimate for the Hubble constant. The source position transformation (SPT), which covers the well-known mass sheet transformation (MST) as a special case, defines a new framework to investigate these degeneracies. In this paper, we presen","authors_text":"Bastian Orthen, Olivier Wertz","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-01-12T12:45:59Z","title":"pySPT: a package dedicated to the source position transformation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1801.04151","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":"sha256:470f51f71562304a5e76a6329e092cdbb536e3d6e8d5d26cf0f14bac24b1e915","target":"record","created_at":"2026-05-18T00:00:22Z","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":"db4c7af7b939b60010a8ab7fed1649b5276a9dfd2d641c037180ea8b805cf0f5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-01-12T12:45:59Z","title_canon_sha256":"63c2ab322fd0d7b28849ac94323605c7b1b0cee098fe932e5b38b8c29b0a05df"},"schema_version":"1.0","source":{"id":"1801.04151","kind":"arxiv","version":1}},"canonical_sha256":"c58e8077f34e82d0255c7564c8adfeb9b48e115fc956bf876ccfd7e6dfca4536","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c58e8077f34e82d0255c7564c8adfeb9b48e115fc956bf876ccfd7e6dfca4536","first_computed_at":"2026-05-18T00:00:22.088833Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:00:22.088833Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"k1zmSUBTF6WETCzhURQmrYbz3MppED1fnr1PXFGKT6o8JGeVVxZ633uDS4O+TCXsZIQMDRuxicJpwgzvHwnhAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:00:22.089439Z","signed_message":"canonical_sha256_bytes"},"source_id":"1801.04151","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:470f51f71562304a5e76a6329e092cdbb536e3d6e8d5d26cf0f14bac24b1e915","sha256:2ae9d9dc24080b572f210ed656585dbf1c47b9cb6575c68676a5fe888fb201fd"],"state_sha256":"d9a7e702ab6a0babd307c90d826e0e888a083114bf3a158fb09c55f8be15cc0b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BOLRehkBk5TSgyADtXnddktmE0bxjAmdBlGrJdB4zEFMrdDg5syuB6JcA4+NQvdhr9PoY97XU9Tm7hXWQ+kICA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-02T20:17:51.830724Z","bundle_sha256":"416cbe119863ab5d8ffcfb94667109d260f80305933d1e61538486324c283fb6"}}