{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:IFZGXKQE4GWDSTRRZWWH5Y2ASX","short_pith_number":"pith:IFZGXKQE","canonical_record":{"source":{"id":"1810.04603","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.OS","submitted_at":"2018-10-10T15:49:52Z","cross_cats_sorted":[],"title_canon_sha256":"ea04e5433f602df70d23915e77d36f8cdb9ca44e1b8ef7e8ddd2313f1c96a7b7","abstract_canon_sha256":"e98a219129434331e50592632211674fb99607bfc1f3f67128b09608a0aaae52"},"schema_version":"1.0"},"canonical_sha256":"41726baa04e1ac394e31cdac7ee34095d167479705422e0b2b295923a0ce6c19","source":{"kind":"arxiv","id":"1810.04603","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.04603","created_at":"2026-05-18T00:03:39Z"},{"alias_kind":"arxiv_version","alias_value":"1810.04603v1","created_at":"2026-05-18T00:03:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.04603","created_at":"2026-05-18T00:03:39Z"},{"alias_kind":"pith_short_12","alias_value":"IFZGXKQE4GWD","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"IFZGXKQE4GWDSTRR","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"IFZGXKQE","created_at":"2026-05-18T12:32:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:IFZGXKQE4GWDSTRRZWWH5Y2ASX","target":"record","payload":{"canonical_record":{"source":{"id":"1810.04603","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.OS","submitted_at":"2018-10-10T15:49:52Z","cross_cats_sorted":[],"title_canon_sha256":"ea04e5433f602df70d23915e77d36f8cdb9ca44e1b8ef7e8ddd2313f1c96a7b7","abstract_canon_sha256":"e98a219129434331e50592632211674fb99607bfc1f3f67128b09608a0aaae52"},"schema_version":"1.0"},"canonical_sha256":"41726baa04e1ac394e31cdac7ee34095d167479705422e0b2b295923a0ce6c19","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:03:39.612587Z","signature_b64":"C4UCKG8d6v5oyI04MDZr1eu1BSNpMiQq8oLPB3ipaysEDKNAIabAzfzWA4HWo51SiObA+sPP8kjYCPA82Id6Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"41726baa04e1ac394e31cdac7ee34095d167479705422e0b2b295923a0ce6c19","last_reissued_at":"2026-05-18T00:03:39.612025Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:03:39.612025Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1810.04603","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":"2026-05-18T00:03:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sBzsfJ1IGW1H8QgimjY2loTelJf0DPCcE62GPgwFocvijBWiYObD1IuJu8EfulIwrRM9DBv3cuBsXKnQ718DAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T09:13:26.917252Z"},"content_sha256":"d037e745a423f6a61afe518a693629400487da23392b4666d237df58babe8585","schema_version":"1.0","event_id":"sha256:d037e745a423f6a61afe518a693629400487da23392b4666d237df58babe8585"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:IFZGXKQE4GWDSTRRZWWH5Y2ASX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Revitalizing Copybacks in Modern SSDs: Why and How","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.OS","authors_text":"Duwon Hong, Jihong Kim, Jisung Park, Myoungsoo Jung, Myungsuk Kim","submitted_at":"2018-10-10T15:49:52Z","abstract_excerpt":"For modern flash-based SSDs, the performance overhead of internal data migrations is dominated by the data transfer time, not by the flash program time as in old SSDs. In order to mitigate the performance impact of data migrations, we propose rCopyback, a restricted version of copyback. Rcopyback works like the original copyback except that only n consecutive copybacks are allowed. By limiting the number of successive copybacks, it guarantees that no data reliability problem occurs when data is internally migrated using rCopyback. In order to take a full advantage of rCopyback, we developed a "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.04603","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":"2026-05-18T00:03:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oIKYPgf8lubAdJ8HzB9WZswO+QY6JUBTaUTgYS669NvGKnXeasdpi5XPK8uqO8GOACNmtWqBHoJjH/dycuo3Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T09:13:26.917827Z"},"content_sha256":"74895a8b13b727e967e7cf2f6fa86ba69970dbdbf58d0de793a94d4c37f6c282","schema_version":"1.0","event_id":"sha256:74895a8b13b727e967e7cf2f6fa86ba69970dbdbf58d0de793a94d4c37f6c282"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IFZGXKQE4GWDSTRRZWWH5Y2ASX/bundle.json","state_url":"https://pith.science/pith/IFZGXKQE4GWDSTRRZWWH5Y2ASX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IFZGXKQE4GWDSTRRZWWH5Y2ASX/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":"2026-06-07T09:13:26Z","links":{"resolver":"https://pith.science/pith/IFZGXKQE4GWDSTRRZWWH5Y2ASX","bundle":"https://pith.science/pith/IFZGXKQE4GWDSTRRZWWH5Y2ASX/bundle.json","state":"https://pith.science/pith/IFZGXKQE4GWDSTRRZWWH5Y2ASX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IFZGXKQE4GWDSTRRZWWH5Y2ASX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:IFZGXKQE4GWDSTRRZWWH5Y2ASX","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":"e98a219129434331e50592632211674fb99607bfc1f3f67128b09608a0aaae52","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.OS","submitted_at":"2018-10-10T15:49:52Z","title_canon_sha256":"ea04e5433f602df70d23915e77d36f8cdb9ca44e1b8ef7e8ddd2313f1c96a7b7"},"schema_version":"1.0","source":{"id":"1810.04603","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.04603","created_at":"2026-05-18T00:03:39Z"},{"alias_kind":"arxiv_version","alias_value":"1810.04603v1","created_at":"2026-05-18T00:03:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.04603","created_at":"2026-05-18T00:03:39Z"},{"alias_kind":"pith_short_12","alias_value":"IFZGXKQE4GWD","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_16","alias_value":"IFZGXKQE4GWDSTRR","created_at":"2026-05-18T12:32:28Z"},{"alias_kind":"pith_short_8","alias_value":"IFZGXKQE","created_at":"2026-05-18T12:32:28Z"}],"graph_snapshots":[{"event_id":"sha256:74895a8b13b727e967e7cf2f6fa86ba69970dbdbf58d0de793a94d4c37f6c282","target":"graph","created_at":"2026-05-18T00:03:39Z","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":"For modern flash-based SSDs, the performance overhead of internal data migrations is dominated by the data transfer time, not by the flash program time as in old SSDs. In order to mitigate the performance impact of data migrations, we propose rCopyback, a restricted version of copyback. Rcopyback works like the original copyback except that only n consecutive copybacks are allowed. By limiting the number of successive copybacks, it guarantees that no data reliability problem occurs when data is internally migrated using rCopyback. In order to take a full advantage of rCopyback, we developed a ","authors_text":"Duwon Hong, Jihong Kim, Jisung Park, Myoungsoo Jung, Myungsuk Kim","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.OS","submitted_at":"2018-10-10T15:49:52Z","title":"Revitalizing Copybacks in Modern SSDs: Why and How"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.04603","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:d037e745a423f6a61afe518a693629400487da23392b4666d237df58babe8585","target":"record","created_at":"2026-05-18T00:03:39Z","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":"e98a219129434331e50592632211674fb99607bfc1f3f67128b09608a0aaae52","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.OS","submitted_at":"2018-10-10T15:49:52Z","title_canon_sha256":"ea04e5433f602df70d23915e77d36f8cdb9ca44e1b8ef7e8ddd2313f1c96a7b7"},"schema_version":"1.0","source":{"id":"1810.04603","kind":"arxiv","version":1}},"canonical_sha256":"41726baa04e1ac394e31cdac7ee34095d167479705422e0b2b295923a0ce6c19","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"41726baa04e1ac394e31cdac7ee34095d167479705422e0b2b295923a0ce6c19","first_computed_at":"2026-05-18T00:03:39.612025Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:03:39.612025Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"C4UCKG8d6v5oyI04MDZr1eu1BSNpMiQq8oLPB3ipaysEDKNAIabAzfzWA4HWo51SiObA+sPP8kjYCPA82Id6Cg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:03:39.612587Z","signed_message":"canonical_sha256_bytes"},"source_id":"1810.04603","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d037e745a423f6a61afe518a693629400487da23392b4666d237df58babe8585","sha256:74895a8b13b727e967e7cf2f6fa86ba69970dbdbf58d0de793a94d4c37f6c282"],"state_sha256":"a43605b9969a3e37b05ef13d1a65eb9a9a0d5ddbf3afdcdba262bf8107ce88cb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pohJNSFhPL2A3+s2fvs4GdeEXLNEh923OTIrfwlxVxfkPPAgSrb7sqytU8+5VRAoPMOu6C5OzV2U71VyEihXAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T09:13:26.920915Z","bundle_sha256":"08c8badb0c273dfb0ef2852294d4968712d71e1a35cc3e8ee60a52c6b517544c"}}