{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:W54NKJVPS73KUBPTCP3WX3T3LL","short_pith_number":"pith:W54NKJVP","canonical_record":{"source":{"id":"1611.05313","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2016-11-16T15:22:16Z","cross_cats_sorted":[],"title_canon_sha256":"35c1591121add43419935a041ba2d762f9cecb19314a9e447de5a8f952098622","abstract_canon_sha256":"3ac5adebad7c39e4fcfbfdacb2ae00c8429f266fff3b233a0cbc8a5e7c2299ef"},"schema_version":"1.0"},"canonical_sha256":"b778d526af97f6aa05f313f76bee7b5ac5ad5e65c267ec312ef0b34eb7a999a2","source":{"kind":"arxiv","id":"1611.05313","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1611.05313","created_at":"2026-05-18T00:58:27Z"},{"alias_kind":"arxiv_version","alias_value":"1611.05313v1","created_at":"2026-05-18T00:58:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1611.05313","created_at":"2026-05-18T00:58:27Z"},{"alias_kind":"pith_short_12","alias_value":"W54NKJVPS73K","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"W54NKJVPS73KUBPT","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"W54NKJVP","created_at":"2026-05-18T12:30:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:W54NKJVPS73KUBPTCP3WX3T3LL","target":"record","payload":{"canonical_record":{"source":{"id":"1611.05313","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2016-11-16T15:22:16Z","cross_cats_sorted":[],"title_canon_sha256":"35c1591121add43419935a041ba2d762f9cecb19314a9e447de5a8f952098622","abstract_canon_sha256":"3ac5adebad7c39e4fcfbfdacb2ae00c8429f266fff3b233a0cbc8a5e7c2299ef"},"schema_version":"1.0"},"canonical_sha256":"b778d526af97f6aa05f313f76bee7b5ac5ad5e65c267ec312ef0b34eb7a999a2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:58:27.379768Z","signature_b64":"BUn/fSyuULV4uVBlQ0IIxcvgSRd0A6miQJ+fcnpYHxGXCieLzw2dRGB4AgA9GX9SYrlhfif4kbfHN1QJ6BD4Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b778d526af97f6aa05f313f76bee7b5ac5ad5e65c267ec312ef0b34eb7a999a2","last_reissued_at":"2026-05-18T00:58:27.379187Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:58:27.379187Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1611.05313","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":"2026-05-18T00:58:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"S0RyGw0sCAPg7OqUB0yhMpzaQ/CgbWRbs05nom8T4IUIwTATCQ35fGA5hzM+3BEUJuS2f4jn0TDyOxSdItwtAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T19:25:06.589485Z"},"content_sha256":"195f29d8faee907aaa58057917430d6a179bb1abd8157541e743d0eab51b1f5e","schema_version":"1.0","event_id":"sha256:195f29d8faee907aaa58057917430d6a179bb1abd8157541e743d0eab51b1f5e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:W54NKJVPS73KUBPTCP3WX3T3LL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"\"What is The SI?\" A Proposal for an Educational Adjunct to the SI Redefinition","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.ed-ph","authors_text":"David B. Newell, Neil M. Zimmerman","submitted_at":"2016-11-16T15:22:16Z","abstract_excerpt":"We discuss how the likely 2018 redefinition of the SI system of units might affect the ability of students to understand the link between the units and the new system. The likely redefinition will no longer define a set of base units, but rather a set of constants of nature, such as the speed of light c and a particular hyperfine splitting in Cs $\\Delta\\nu(^{133}$Cs)$_{hfs}$. We point out that this list of constants need not be the only way to introduce students to the subject, either in class or in textbooks. We suggest an alternative way to introduce high school and undergraduate students to"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1611.05313","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":"2026-05-18T00:58:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Om74hTR57EEJ+oZ4PbvwaEwK4FSzx4WBXaoow3ulzdHqj2+6KpY2/PaPyjQ212d7WjafBMWNqhvTSSN7+2pZDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T19:25:06.590128Z"},"content_sha256":"99087e106447f2d88f9b805ec3ece88cb01ff129e569bf46c50cf56ebc75d829","schema_version":"1.0","event_id":"sha256:99087e106447f2d88f9b805ec3ece88cb01ff129e569bf46c50cf56ebc75d829"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W54NKJVPS73KUBPTCP3WX3T3LL/bundle.json","state_url":"https://pith.science/pith/W54NKJVPS73KUBPTCP3WX3T3LL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W54NKJVPS73KUBPTCP3WX3T3LL/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":"2026-06-08T19:25:06Z","links":{"resolver":"https://pith.science/pith/W54NKJVPS73KUBPTCP3WX3T3LL","bundle":"https://pith.science/pith/W54NKJVPS73KUBPTCP3WX3T3LL/bundle.json","state":"https://pith.science/pith/W54NKJVPS73KUBPTCP3WX3T3LL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W54NKJVPS73KUBPTCP3WX3T3LL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:W54NKJVPS73KUBPTCP3WX3T3LL","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":"3ac5adebad7c39e4fcfbfdacb2ae00c8429f266fff3b233a0cbc8a5e7c2299ef","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2016-11-16T15:22:16Z","title_canon_sha256":"35c1591121add43419935a041ba2d762f9cecb19314a9e447de5a8f952098622"},"schema_version":"1.0","source":{"id":"1611.05313","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1611.05313","created_at":"2026-05-18T00:58:27Z"},{"alias_kind":"arxiv_version","alias_value":"1611.05313v1","created_at":"2026-05-18T00:58:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1611.05313","created_at":"2026-05-18T00:58:27Z"},{"alias_kind":"pith_short_12","alias_value":"W54NKJVPS73K","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"W54NKJVPS73KUBPT","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"W54NKJVP","created_at":"2026-05-18T12:30:48Z"}],"graph_snapshots":[{"event_id":"sha256:99087e106447f2d88f9b805ec3ece88cb01ff129e569bf46c50cf56ebc75d829","target":"graph","created_at":"2026-05-18T00:58:27Z","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 discuss how the likely 2018 redefinition of the SI system of units might affect the ability of students to understand the link between the units and the new system. The likely redefinition will no longer define a set of base units, but rather a set of constants of nature, such as the speed of light c and a particular hyperfine splitting in Cs $\\Delta\\nu(^{133}$Cs)$_{hfs}$. We point out that this list of constants need not be the only way to introduce students to the subject, either in class or in textbooks. We suggest an alternative way to introduce high school and undergraduate students to","authors_text":"David B. Newell, Neil M. Zimmerman","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2016-11-16T15:22:16Z","title":"\"What is The SI?\" A Proposal for an Educational Adjunct to the SI Redefinition"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1611.05313","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":"sha256:195f29d8faee907aaa58057917430d6a179bb1abd8157541e743d0eab51b1f5e","target":"record","created_at":"2026-05-18T00:58:27Z","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":"3ac5adebad7c39e4fcfbfdacb2ae00c8429f266fff3b233a0cbc8a5e7c2299ef","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.ed-ph","submitted_at":"2016-11-16T15:22:16Z","title_canon_sha256":"35c1591121add43419935a041ba2d762f9cecb19314a9e447de5a8f952098622"},"schema_version":"1.0","source":{"id":"1611.05313","kind":"arxiv","version":1}},"canonical_sha256":"b778d526af97f6aa05f313f76bee7b5ac5ad5e65c267ec312ef0b34eb7a999a2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b778d526af97f6aa05f313f76bee7b5ac5ad5e65c267ec312ef0b34eb7a999a2","first_computed_at":"2026-05-18T00:58:27.379187Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:58:27.379187Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"BUn/fSyuULV4uVBlQ0IIxcvgSRd0A6miQJ+fcnpYHxGXCieLzw2dRGB4AgA9GX9SYrlhfif4kbfHN1QJ6BD4Bg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:58:27.379768Z","signed_message":"canonical_sha256_bytes"},"source_id":"1611.05313","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:195f29d8faee907aaa58057917430d6a179bb1abd8157541e743d0eab51b1f5e","sha256:99087e106447f2d88f9b805ec3ece88cb01ff129e569bf46c50cf56ebc75d829"],"state_sha256":"058eb919b5d2d8554bf0ebee6c630001bdc61bc4d8ff8a6c87ebad08eeb5eb12"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SljJjKIXZCBnKN2NDKhjrNVRhQs+Lns1BMT5mqEPO5HUP0Won0JuO14E+Et0LdQt3jqwHkp1HSVp/9QIUeH8Bg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T19:25:06.593943Z","bundle_sha256":"ff1edbf8c0ca09e34aa88c6739686e088c943006634abd68a552bbfac683a57b"}}