{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:W7BGX4GAT4SYASSBTSWXEDG7GU","short_pith_number":"pith:W7BGX4GA","canonical_record":{"source":{"id":"1603.07236","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.SD","submitted_at":"2016-03-23T15:29:39Z","cross_cats_sorted":[],"title_canon_sha256":"062dd83d40c842d1485a542a96fd370576da6a2d44d03927b8b33d7365d18b8d","abstract_canon_sha256":"fe9a8f5630ed00e230534347f0166d22bb83eebdaae5d380af5e2e62796e8d52"},"schema_version":"1.0"},"canonical_sha256":"b7c26bf0c09f25804a419cad720cdf3511af0ba00ab4cb33ca8a873b528ed5c3","source":{"kind":"arxiv","id":"1603.07236","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1603.07236","created_at":"2026-05-18T01:16:13Z"},{"alias_kind":"arxiv_version","alias_value":"1603.07236v2","created_at":"2026-05-18T01:16:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1603.07236","created_at":"2026-05-18T01:16:13Z"},{"alias_kind":"pith_short_12","alias_value":"W7BGX4GAT4SY","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"W7BGX4GAT4SYASSB","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"W7BGX4GA","created_at":"2026-05-18T12:30:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:W7BGX4GAT4SYASSBTSWXEDG7GU","target":"record","payload":{"canonical_record":{"source":{"id":"1603.07236","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.SD","submitted_at":"2016-03-23T15:29:39Z","cross_cats_sorted":[],"title_canon_sha256":"062dd83d40c842d1485a542a96fd370576da6a2d44d03927b8b33d7365d18b8d","abstract_canon_sha256":"fe9a8f5630ed00e230534347f0166d22bb83eebdaae5d380af5e2e62796e8d52"},"schema_version":"1.0"},"canonical_sha256":"b7c26bf0c09f25804a419cad720cdf3511af0ba00ab4cb33ca8a873b528ed5c3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:16:13.287528Z","signature_b64":"5ak02OSMnOwWsKqRDDQ/Df9E3sztRn9Fkoc7NV353QIa3Tcmw5lvekNNLU7iWXv33FYWO1O5qbm5/jIBu+2sAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b7c26bf0c09f25804a419cad720cdf3511af0ba00ab4cb33ca8a873b528ed5c3","last_reissued_at":"2026-05-18T01:16:13.287069Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:16:13.287069Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1603.07236","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":"2026-05-18T01:16:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LmpPAOxReHxczDyc6Hg12NwCKh8051XSMKzb6k0L6cPMfRUh5E1wdAdpM0zAxKtI66Xd1UggmJlpaXxagDboCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T00:16:16.509135Z"},"content_sha256":"891f2daaa68ecf17b2cd81938a376d52904203a84cbee2ba2cef4927fb96ba99","schema_version":"1.0","event_id":"sha256:891f2daaa68ecf17b2cd81938a376d52904203a84cbee2ba2cef4927fb96ba99"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:W7BGX4GAT4SYASSBTSWXEDG7GU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Individual identity in songbirds: signal representations and metric learning for locating the information in complex corvid calls","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cs.SD","authors_text":"Dan Stowell, Lisa F. Gill, Veronica Morfi","submitted_at":"2016-03-23T15:29:39Z","abstract_excerpt":"Bird calls range from simple tones to rich dynamic multi-harmonic structures. The more complex calls are very poorly understood at present, such as those of the scientifically important corvid family (jackdaws, crows, ravens, etc.). Individual birds can recognise familiar individuals from calls, but where in the signal is this identity encoded? We studied the question by applying a combination of feature representations to a dataset of jackdaw calls, including linear predictive coding (LPC) and adaptive discrete Fourier transform (aDFT). We demonstrate through a classification paradigm that we"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1603.07236","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":"2026-05-18T01:16:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tVAaRGQY8+hPXBSBfFfO3v8N8TqGWvNTNV5bG2XfFCvCS8l6Z5EgRlcCv6HT6PNzzi0D4OmZZZ7sKATR8IFUBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T00:16:16.509682Z"},"content_sha256":"707d86d6af4e8c7203f0b7b3530e3bf007b221fe77bb8f1ade3fb584a599466f","schema_version":"1.0","event_id":"sha256:707d86d6af4e8c7203f0b7b3530e3bf007b221fe77bb8f1ade3fb584a599466f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W7BGX4GAT4SYASSBTSWXEDG7GU/bundle.json","state_url":"https://pith.science/pith/W7BGX4GAT4SYASSBTSWXEDG7GU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W7BGX4GAT4SYASSBTSWXEDG7GU/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":"2026-06-26T00:16:16Z","links":{"resolver":"https://pith.science/pith/W7BGX4GAT4SYASSBTSWXEDG7GU","bundle":"https://pith.science/pith/W7BGX4GAT4SYASSBTSWXEDG7GU/bundle.json","state":"https://pith.science/pith/W7BGX4GAT4SYASSBTSWXEDG7GU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W7BGX4GAT4SYASSBTSWXEDG7GU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:W7BGX4GAT4SYASSBTSWXEDG7GU","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":"fe9a8f5630ed00e230534347f0166d22bb83eebdaae5d380af5e2e62796e8d52","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.SD","submitted_at":"2016-03-23T15:29:39Z","title_canon_sha256":"062dd83d40c842d1485a542a96fd370576da6a2d44d03927b8b33d7365d18b8d"},"schema_version":"1.0","source":{"id":"1603.07236","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1603.07236","created_at":"2026-05-18T01:16:13Z"},{"alias_kind":"arxiv_version","alias_value":"1603.07236v2","created_at":"2026-05-18T01:16:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1603.07236","created_at":"2026-05-18T01:16:13Z"},{"alias_kind":"pith_short_12","alias_value":"W7BGX4GAT4SY","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"W7BGX4GAT4SYASSB","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"W7BGX4GA","created_at":"2026-05-18T12:30:48Z"}],"graph_snapshots":[{"event_id":"sha256:707d86d6af4e8c7203f0b7b3530e3bf007b221fe77bb8f1ade3fb584a599466f","target":"graph","created_at":"2026-05-18T01:16:13Z","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":"Bird calls range from simple tones to rich dynamic multi-harmonic structures. The more complex calls are very poorly understood at present, such as those of the scientifically important corvid family (jackdaws, crows, ravens, etc.). Individual birds can recognise familiar individuals from calls, but where in the signal is this identity encoded? We studied the question by applying a combination of feature representations to a dataset of jackdaw calls, including linear predictive coding (LPC) and adaptive discrete Fourier transform (aDFT). We demonstrate through a classification paradigm that we","authors_text":"Dan Stowell, Lisa F. Gill, Veronica Morfi","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.SD","submitted_at":"2016-03-23T15:29:39Z","title":"Individual identity in songbirds: signal representations and metric learning for locating the information in complex corvid calls"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1603.07236","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":"sha256:891f2daaa68ecf17b2cd81938a376d52904203a84cbee2ba2cef4927fb96ba99","target":"record","created_at":"2026-05-18T01:16:13Z","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":"fe9a8f5630ed00e230534347f0166d22bb83eebdaae5d380af5e2e62796e8d52","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.SD","submitted_at":"2016-03-23T15:29:39Z","title_canon_sha256":"062dd83d40c842d1485a542a96fd370576da6a2d44d03927b8b33d7365d18b8d"},"schema_version":"1.0","source":{"id":"1603.07236","kind":"arxiv","version":2}},"canonical_sha256":"b7c26bf0c09f25804a419cad720cdf3511af0ba00ab4cb33ca8a873b528ed5c3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b7c26bf0c09f25804a419cad720cdf3511af0ba00ab4cb33ca8a873b528ed5c3","first_computed_at":"2026-05-18T01:16:13.287069Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:16:13.287069Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"5ak02OSMnOwWsKqRDDQ/Df9E3sztRn9Fkoc7NV353QIa3Tcmw5lvekNNLU7iWXv33FYWO1O5qbm5/jIBu+2sAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:16:13.287528Z","signed_message":"canonical_sha256_bytes"},"source_id":"1603.07236","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:891f2daaa68ecf17b2cd81938a376d52904203a84cbee2ba2cef4927fb96ba99","sha256:707d86d6af4e8c7203f0b7b3530e3bf007b221fe77bb8f1ade3fb584a599466f"],"state_sha256":"f4b85dbdfcb6b81ffdb02d94c9f05ca4ec5685740b63f366c4ebc1938c8fb988"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ewrt2+Undz66EvEuc0CTtYz8sRENyEqt1E6/nqh/4i+nudOiChyATHR8EVu8u2xvpgGWEqxbx2YW1UC7JNTCCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-26T00:16:16.512383Z","bundle_sha256":"a90651393a13680a4b7112bc27b15776324361a3afd2719e2a738431b0f7934d"}}