{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:UWKAQE7RQRMWZ7JRZ4NNV4V7HQ","short_pith_number":"pith:UWKAQE7R","canonical_record":{"source":{"id":"1507.08733","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-07-31T02:42:08Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"c96b66be27e79357fae4d89f7032593d9dcd3f1a85a48e7e8dfb0221b14cc2a6","abstract_canon_sha256":"dcab700052cbae3c1a63cb27329aaaec9f21d9aaf865749457977012f69aa32d"},"schema_version":"1.0"},"canonical_sha256":"a5940813f184596cfd31cf1adaf2bf3c0e7ec63091c91057bf6c046c985e4bd4","source":{"kind":"arxiv","id":"1507.08733","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.08733","created_at":"2026-05-18T01:36:03Z"},{"alias_kind":"arxiv_version","alias_value":"1507.08733v1","created_at":"2026-05-18T01:36:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.08733","created_at":"2026-05-18T01:36:03Z"},{"alias_kind":"pith_short_12","alias_value":"UWKAQE7RQRMW","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_16","alias_value":"UWKAQE7RQRMWZ7JR","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_8","alias_value":"UWKAQE7R","created_at":"2026-05-18T12:29:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:UWKAQE7RQRMWZ7JRZ4NNV4V7HQ","target":"record","payload":{"canonical_record":{"source":{"id":"1507.08733","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-07-31T02:42:08Z","cross_cats_sorted":["math.IT"],"title_canon_sha256":"c96b66be27e79357fae4d89f7032593d9dcd3f1a85a48e7e8dfb0221b14cc2a6","abstract_canon_sha256":"dcab700052cbae3c1a63cb27329aaaec9f21d9aaf865749457977012f69aa32d"},"schema_version":"1.0"},"canonical_sha256":"a5940813f184596cfd31cf1adaf2bf3c0e7ec63091c91057bf6c046c985e4bd4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:36:03.019344Z","signature_b64":"M4+n9saHlg2nZO1x2QG62OgxNGzQjVm+0/Lqr33paWqKDOXW1d74LNYZdJLk22ZVo6ry6VIEBHOjOxfKYuFNBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a5940813f184596cfd31cf1adaf2bf3c0e7ec63091c91057bf6c046c985e4bd4","last_reissued_at":"2026-05-18T01:36:03.018803Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:36:03.018803Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1507.08733","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":"2026-05-18T01:36:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Tx4odJHuJ7x8Gk1xz2GpL+bBgKMX5/TO8wuL9bh/CIch8MB66mU6G2czouBrISHoJ9fItCKk2OcQqb33kO6ODw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-21T23:54:40.055392Z"},"content_sha256":"5f1766eb0eb2132e6cf1b4b5e95e9593d15affe7bbd757684dc753cab15f81d4","schema_version":"1.0","event_id":"sha256:5f1766eb0eb2132e6cf1b4b5e95e9593d15affe7bbd757684dc753cab15f81d4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:UWKAQE7RQRMWZ7JRZ4NNV4V7HQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Almost Instantaneous Fix-to-Variable Length Codes","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.IT"],"primary_cat":"cs.IT","authors_text":"Hirosuke Yamamoto, Junya Honda, Masato Tsuchihashi","submitted_at":"2015-07-31T02:42:08Z","abstract_excerpt":"We propose almost instantaneous fixed-to-variable-length (AIFV) codes such that two (resp. $K-1$) code trees are used if code symbols are binary (resp. $K$-ary for $K \\geq 3$), and source symbols are assigned to incomplete internal nodes in addition to leaves. Although the AIFV codes are not instantaneous codes, they are devised such that the decoding delay is at most two bits (resp. one code symbol) in the case of binary (resp. $K$-ary) code alphabet. The AIFV code can attain better average compression rate than the Huffman code at the expenses of a little decoding delay and a little large me"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.08733","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":"2026-05-18T01:36:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"avoXR2+rB5vfPMdoMt0DJwuBlwDjaTaWtKcLAleyvWG1YYsMFVLr/6ts9b5+F8XSsTQB33Tww9igOAOeKtXlBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-21T23:54:40.055744Z"},"content_sha256":"0dd562f1734148aa43cb76ecccf81b5e0a9db45634dfffbd20c40c662f8d6355","schema_version":"1.0","event_id":"sha256:0dd562f1734148aa43cb76ecccf81b5e0a9db45634dfffbd20c40c662f8d6355"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UWKAQE7RQRMWZ7JRZ4NNV4V7HQ/bundle.json","state_url":"https://pith.science/pith/UWKAQE7RQRMWZ7JRZ4NNV4V7HQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UWKAQE7RQRMWZ7JRZ4NNV4V7HQ/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":"2026-06-21T23:54:40Z","links":{"resolver":"https://pith.science/pith/UWKAQE7RQRMWZ7JRZ4NNV4V7HQ","bundle":"https://pith.science/pith/UWKAQE7RQRMWZ7JRZ4NNV4V7HQ/bundle.json","state":"https://pith.science/pith/UWKAQE7RQRMWZ7JRZ4NNV4V7HQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UWKAQE7RQRMWZ7JRZ4NNV4V7HQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:UWKAQE7RQRMWZ7JRZ4NNV4V7HQ","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":"dcab700052cbae3c1a63cb27329aaaec9f21d9aaf865749457977012f69aa32d","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-07-31T02:42:08Z","title_canon_sha256":"c96b66be27e79357fae4d89f7032593d9dcd3f1a85a48e7e8dfb0221b14cc2a6"},"schema_version":"1.0","source":{"id":"1507.08733","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.08733","created_at":"2026-05-18T01:36:03Z"},{"alias_kind":"arxiv_version","alias_value":"1507.08733v1","created_at":"2026-05-18T01:36:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.08733","created_at":"2026-05-18T01:36:03Z"},{"alias_kind":"pith_short_12","alias_value":"UWKAQE7RQRMW","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_16","alias_value":"UWKAQE7RQRMWZ7JR","created_at":"2026-05-18T12:29:44Z"},{"alias_kind":"pith_short_8","alias_value":"UWKAQE7R","created_at":"2026-05-18T12:29:44Z"}],"graph_snapshots":[{"event_id":"sha256:0dd562f1734148aa43cb76ecccf81b5e0a9db45634dfffbd20c40c662f8d6355","target":"graph","created_at":"2026-05-18T01:36:03Z","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 propose almost instantaneous fixed-to-variable-length (AIFV) codes such that two (resp. $K-1$) code trees are used if code symbols are binary (resp. $K$-ary for $K \\geq 3$), and source symbols are assigned to incomplete internal nodes in addition to leaves. Although the AIFV codes are not instantaneous codes, they are devised such that the decoding delay is at most two bits (resp. one code symbol) in the case of binary (resp. $K$-ary) code alphabet. The AIFV code can attain better average compression rate than the Huffman code at the expenses of a little decoding delay and a little large me","authors_text":"Hirosuke Yamamoto, Junya Honda, Masato Tsuchihashi","cross_cats":["math.IT"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-07-31T02:42:08Z","title":"Almost Instantaneous Fix-to-Variable Length Codes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.08733","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":"sha256:5f1766eb0eb2132e6cf1b4b5e95e9593d15affe7bbd757684dc753cab15f81d4","target":"record","created_at":"2026-05-18T01:36:03Z","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":"dcab700052cbae3c1a63cb27329aaaec9f21d9aaf865749457977012f69aa32d","cross_cats_sorted":["math.IT"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.IT","submitted_at":"2015-07-31T02:42:08Z","title_canon_sha256":"c96b66be27e79357fae4d89f7032593d9dcd3f1a85a48e7e8dfb0221b14cc2a6"},"schema_version":"1.0","source":{"id":"1507.08733","kind":"arxiv","version":1}},"canonical_sha256":"a5940813f184596cfd31cf1adaf2bf3c0e7ec63091c91057bf6c046c985e4bd4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a5940813f184596cfd31cf1adaf2bf3c0e7ec63091c91057bf6c046c985e4bd4","first_computed_at":"2026-05-18T01:36:03.018803Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:36:03.018803Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"M4+n9saHlg2nZO1x2QG62OgxNGzQjVm+0/Lqr33paWqKDOXW1d74LNYZdJLk22ZVo6ry6VIEBHOjOxfKYuFNBA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:36:03.019344Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.08733","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5f1766eb0eb2132e6cf1b4b5e95e9593d15affe7bbd757684dc753cab15f81d4","sha256:0dd562f1734148aa43cb76ecccf81b5e0a9db45634dfffbd20c40c662f8d6355"],"state_sha256":"a785b5807574c046f7bd86b80dee7d2054314b9c34d6e6cd79fa2eccb39d3cf7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mXBo7RWcMepNpLcZaZANfK9WpYTFBFswEfXV6tarrL4qy19T5boMLoP/aBZWetd0rPJzdL2U7V46Pv6omr/2AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-21T23:54:40.057834Z","bundle_sha256":"65f02b7c4785a0a99abfcfdc560793a5021753c559c476f1907ddd0eea063d53"}}