{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:JZU6QKYMYILYXAGCCV3IS6YFWZ","short_pith_number":"pith:JZU6QKYM","canonical_record":{"source":{"id":"1212.1721","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-12-07T21:02:51Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"59f59f31a1bd163be61341519801418bab60bbe6449a8f5b1eb549e9dddb959f","abstract_canon_sha256":"61995fa4590e3f2a5bde888c6c98e4f1ec5c3f0f9fb8d7bf75e55d0460631706"},"schema_version":"1.0"},"canonical_sha256":"4e69e82b0cc2178b80c21576897b05b66b20058c817aea79a90bb2703eee812d","source":{"kind":"arxiv","id":"1212.1721","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1212.1721","created_at":"2026-05-18T03:11:36Z"},{"alias_kind":"arxiv_version","alias_value":"1212.1721v2","created_at":"2026-05-18T03:11:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1212.1721","created_at":"2026-05-18T03:11:36Z"},{"alias_kind":"pith_short_12","alias_value":"JZU6QKYMYILY","created_at":"2026-05-18T12:27:11Z"},{"alias_kind":"pith_short_16","alias_value":"JZU6QKYMYILYXAGC","created_at":"2026-05-18T12:27:11Z"},{"alias_kind":"pith_short_8","alias_value":"JZU6QKYM","created_at":"2026-05-18T12:27:11Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:JZU6QKYMYILYXAGCCV3IS6YFWZ","target":"record","payload":{"canonical_record":{"source":{"id":"1212.1721","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-12-07T21:02:51Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"59f59f31a1bd163be61341519801418bab60bbe6449a8f5b1eb549e9dddb959f","abstract_canon_sha256":"61995fa4590e3f2a5bde888c6c98e4f1ec5c3f0f9fb8d7bf75e55d0460631706"},"schema_version":"1.0"},"canonical_sha256":"4e69e82b0cc2178b80c21576897b05b66b20058c817aea79a90bb2703eee812d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:11:36.005798Z","signature_b64":"wIMhxKVjsZtbKW7MtT5fhqVLccDMsK8qIWb4TG+fvsdQVMiWINAILBi62/ufcVi0vd3BpBQu/BZfOkpIP9rOCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4e69e82b0cc2178b80c21576897b05b66b20058c817aea79a90bb2703eee812d","last_reissued_at":"2026-05-18T03:11:36.005056Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:11:36.005056Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1212.1721","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":"2026-05-18T03:11:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"db24DPNbpVt8IAvclbGz3xbsVUab+dS3ah94/s70HUJv6x5kqtfynivpMnfOuVhe0S5Lovx8fbsHpFfDsP24AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T15:28:25.279439Z"},"content_sha256":"520c3e4722925444094d047d296078027072e75bfa7609e86dbcd17b487c7846","schema_version":"1.0","event_id":"sha256:520c3e4722925444094d047d296078027072e75bfa7609e86dbcd17b487c7846"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:JZU6QKYMYILYXAGCCV3IS6YFWZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"CosmoHammer: Cosmological parameter estimation with the MCMC Hammer","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.CO","authors_text":"Adam Amara, Alexandre Refregier, Andr\\'e Csillaghy, Jo\\\"el Akeret, Sebastian Seehars","submitted_at":"2012-12-07T21:02:51Z","abstract_excerpt":"We study the benefits and limits of parallelised Markov chain Monte Carlo (MCMC) sampling in cosmology. MCMC methods are widely used for the estimation of cosmological parameters from a given set of observations and are typically based on the Metropolis-Hastings algorithm. Some of the required calculations can however be computationally intensive, meaning that a single long chain can take several hours or days to calculate. In practice, this can be limiting, since the MCMC process needs to be performed many times to test the impact of possible systematics and to understand the robustness of th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1212.1721","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":"2026-05-18T03:11:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SehdFR2TyyVFYPIDouEDNFGVvcHThakcmOyH58pD8dVNTAFNLvw3k5sMTZRVe5eCQ/YxPA7lS0xXYHw4+MmvDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T15:28:25.279792Z"},"content_sha256":"1884a76528e2334fc5de2f936d50c91c2290010fe99f8f1eff7169d796f468f2","schema_version":"1.0","event_id":"sha256:1884a76528e2334fc5de2f936d50c91c2290010fe99f8f1eff7169d796f468f2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JZU6QKYMYILYXAGCCV3IS6YFWZ/bundle.json","state_url":"https://pith.science/pith/JZU6QKYMYILYXAGCCV3IS6YFWZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JZU6QKYMYILYXAGCCV3IS6YFWZ/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":"2026-06-01T15:28:25Z","links":{"resolver":"https://pith.science/pith/JZU6QKYMYILYXAGCCV3IS6YFWZ","bundle":"https://pith.science/pith/JZU6QKYMYILYXAGCCV3IS6YFWZ/bundle.json","state":"https://pith.science/pith/JZU6QKYMYILYXAGCCV3IS6YFWZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JZU6QKYMYILYXAGCCV3IS6YFWZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:JZU6QKYMYILYXAGCCV3IS6YFWZ","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":"61995fa4590e3f2a5bde888c6c98e4f1ec5c3f0f9fb8d7bf75e55d0460631706","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-12-07T21:02:51Z","title_canon_sha256":"59f59f31a1bd163be61341519801418bab60bbe6449a8f5b1eb549e9dddb959f"},"schema_version":"1.0","source":{"id":"1212.1721","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1212.1721","created_at":"2026-05-18T03:11:36Z"},{"alias_kind":"arxiv_version","alias_value":"1212.1721v2","created_at":"2026-05-18T03:11:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1212.1721","created_at":"2026-05-18T03:11:36Z"},{"alias_kind":"pith_short_12","alias_value":"JZU6QKYMYILY","created_at":"2026-05-18T12:27:11Z"},{"alias_kind":"pith_short_16","alias_value":"JZU6QKYMYILYXAGC","created_at":"2026-05-18T12:27:11Z"},{"alias_kind":"pith_short_8","alias_value":"JZU6QKYM","created_at":"2026-05-18T12:27:11Z"}],"graph_snapshots":[{"event_id":"sha256:1884a76528e2334fc5de2f936d50c91c2290010fe99f8f1eff7169d796f468f2","target":"graph","created_at":"2026-05-18T03:11:36Z","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":"We study the benefits and limits of parallelised Markov chain Monte Carlo (MCMC) sampling in cosmology. MCMC methods are widely used for the estimation of cosmological parameters from a given set of observations and are typically based on the Metropolis-Hastings algorithm. Some of the required calculations can however be computationally intensive, meaning that a single long chain can take several hours or days to calculate. In practice, this can be limiting, since the MCMC process needs to be performed many times to test the impact of possible systematics and to understand the robustness of th","authors_text":"Adam Amara, Alexandre Refregier, Andr\\'e Csillaghy, Jo\\\"el Akeret, Sebastian Seehars","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-12-07T21:02:51Z","title":"CosmoHammer: Cosmological parameter estimation with the MCMC Hammer"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1212.1721","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":"sha256:520c3e4722925444094d047d296078027072e75bfa7609e86dbcd17b487c7846","target":"record","created_at":"2026-05-18T03:11:36Z","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":"61995fa4590e3f2a5bde888c6c98e4f1ec5c3f0f9fb8d7bf75e55d0460631706","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2012-12-07T21:02:51Z","title_canon_sha256":"59f59f31a1bd163be61341519801418bab60bbe6449a8f5b1eb549e9dddb959f"},"schema_version":"1.0","source":{"id":"1212.1721","kind":"arxiv","version":2}},"canonical_sha256":"4e69e82b0cc2178b80c21576897b05b66b20058c817aea79a90bb2703eee812d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4e69e82b0cc2178b80c21576897b05b66b20058c817aea79a90bb2703eee812d","first_computed_at":"2026-05-18T03:11:36.005056Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:11:36.005056Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"wIMhxKVjsZtbKW7MtT5fhqVLccDMsK8qIWb4TG+fvsdQVMiWINAILBi62/ufcVi0vd3BpBQu/BZfOkpIP9rOCw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:11:36.005798Z","signed_message":"canonical_sha256_bytes"},"source_id":"1212.1721","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:520c3e4722925444094d047d296078027072e75bfa7609e86dbcd17b487c7846","sha256:1884a76528e2334fc5de2f936d50c91c2290010fe99f8f1eff7169d796f468f2"],"state_sha256":"647a78e7b0fb6a7ed7e56c27f059f941763f6a2bf6429fdbc5861559433470ec"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v4HWQBF0E6RXQRD2kSk6FS86ryxyoF2pZ6pbkqHz/JcHAiGY5ZYHOis/7v5k9gxblgfRZjP7lC5Xo3QQpTPdAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T15:28:25.281825Z","bundle_sha256":"01c6da10733fbc99c83568ec2268cb4b301a42872295154cbe39ea3011dc6919"}}