{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:46T64IKONOJSX62PIHFZU5BP6Q","short_pith_number":"pith:46T64IKO","canonical_record":{"source":{"id":"1309.7391","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"cs.CY","submitted_at":"2013-09-27T23:50:57Z","cross_cats_sorted":[],"title_canon_sha256":"f5e232ba4a727d0bdd51baa66d6ff8031dc797e94a409d18bab790a333fed3ae","abstract_canon_sha256":"58a5be34081ca26bfdd1a1b09eb06ba50960b8c66060187a2868f76ba6d5a7d7"},"schema_version":"1.0"},"canonical_sha256":"e7a7ee214e6b932bfb4f41cb9a742ff4046abad3f661b8136705b0aa318dcf06","source":{"kind":"arxiv","id":"1309.7391","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1309.7391","created_at":"2026-05-18T03:11:58Z"},{"alias_kind":"arxiv_version","alias_value":"1309.7391v1","created_at":"2026-05-18T03:11:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1309.7391","created_at":"2026-05-18T03:11:58Z"},{"alias_kind":"pith_short_12","alias_value":"46T64IKONOJS","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_16","alias_value":"46T64IKONOJSX62P","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_8","alias_value":"46T64IKO","created_at":"2026-05-18T12:27:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:46T64IKONOJSX62PIHFZU5BP6Q","target":"record","payload":{"canonical_record":{"source":{"id":"1309.7391","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"cs.CY","submitted_at":"2013-09-27T23:50:57Z","cross_cats_sorted":[],"title_canon_sha256":"f5e232ba4a727d0bdd51baa66d6ff8031dc797e94a409d18bab790a333fed3ae","abstract_canon_sha256":"58a5be34081ca26bfdd1a1b09eb06ba50960b8c66060187a2868f76ba6d5a7d7"},"schema_version":"1.0"},"canonical_sha256":"e7a7ee214e6b932bfb4f41cb9a742ff4046abad3f661b8136705b0aa318dcf06","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:11:58.859531Z","signature_b64":"fOEUvYAIAcs+T+pPA30Z16vnxmclq2kH7+mhNT8F40xuIJmwFXt8JiNFQez4sPQgZRSNX6zTpKJcQ3k5EUYQAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e7a7ee214e6b932bfb4f41cb9a742ff4046abad3f661b8136705b0aa318dcf06","last_reissued_at":"2026-05-18T03:11:58.858701Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:11:58.858701Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1309.7391","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":"2026-05-18T03:11:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HfYAGBxleCq89n31bc6RM3RprqAdldJTc9OBA1+46mFDQUkEj/FjOs1To8KDMc9hQKj0aOrcpcFoHqf/05uHAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T17:41:07.070723Z"},"content_sha256":"1b9950e84d63788ce7a3862244c03a3df61240e707a08006249027b77697e8ed","schema_version":"1.0","event_id":"sha256:1b9950e84d63788ce7a3862244c03a3df61240e707a08006249027b77697e8ed"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:46T64IKONOJSX62PIHFZU5BP6Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Madeup: A Mobile Development Environment for Programming 3-D Models","license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","headline":"","cross_cats":[],"primary_cat":"cs.CY","authors_text":"Chris Johnson","submitted_at":"2013-09-27T23:50:57Z","abstract_excerpt":"Constructionism is a learning theory that states that we learn more when we construct tangible objects. In the process of building and presenting our work, we make concrete the abstract mental models we've formed, see where they breakdown through the feedback we receive, and revise the models accordingly. Computer programming has long been taught under a constructionist approach using sensory-rich contexts like robots, media, and Logo-style environments. Now, with affordable 3-D printers in the hands of consumers, we have a new medium in which learners may realize their computational ideas. In"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1309.7391","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":"2026-05-18T03:11:58Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AS/kOjUTzeNYcd1CaG00rkXVzR+Xpq0D7g4CQmg4MdNAyZesq7L9qUmLilR1ubxwMwk6tpaTstIQANavZh6aDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T17:41:07.071330Z"},"content_sha256":"5df25b9b907481e49ec9203cc24b126ce37d02ea800c745d6ba54a9af44c0757","schema_version":"1.0","event_id":"sha256:5df25b9b907481e49ec9203cc24b126ce37d02ea800c745d6ba54a9af44c0757"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/46T64IKONOJSX62PIHFZU5BP6Q/bundle.json","state_url":"https://pith.science/pith/46T64IKONOJSX62PIHFZU5BP6Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/46T64IKONOJSX62PIHFZU5BP6Q/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":"2026-05-26T17:41:07Z","links":{"resolver":"https://pith.science/pith/46T64IKONOJSX62PIHFZU5BP6Q","bundle":"https://pith.science/pith/46T64IKONOJSX62PIHFZU5BP6Q/bundle.json","state":"https://pith.science/pith/46T64IKONOJSX62PIHFZU5BP6Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/46T64IKONOJSX62PIHFZU5BP6Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:46T64IKONOJSX62PIHFZU5BP6Q","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":"58a5be34081ca26bfdd1a1b09eb06ba50960b8c66060187a2868f76ba6d5a7d7","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"cs.CY","submitted_at":"2013-09-27T23:50:57Z","title_canon_sha256":"f5e232ba4a727d0bdd51baa66d6ff8031dc797e94a409d18bab790a333fed3ae"},"schema_version":"1.0","source":{"id":"1309.7391","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1309.7391","created_at":"2026-05-18T03:11:58Z"},{"alias_kind":"arxiv_version","alias_value":"1309.7391v1","created_at":"2026-05-18T03:11:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1309.7391","created_at":"2026-05-18T03:11:58Z"},{"alias_kind":"pith_short_12","alias_value":"46T64IKONOJS","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_16","alias_value":"46T64IKONOJSX62P","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_8","alias_value":"46T64IKO","created_at":"2026-05-18T12:27:32Z"}],"graph_snapshots":[{"event_id":"sha256:5df25b9b907481e49ec9203cc24b126ce37d02ea800c745d6ba54a9af44c0757","target":"graph","created_at":"2026-05-18T03:11:58Z","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":"Constructionism is a learning theory that states that we learn more when we construct tangible objects. In the process of building and presenting our work, we make concrete the abstract mental models we've formed, see where they breakdown through the feedback we receive, and revise the models accordingly. Computer programming has long been taught under a constructionist approach using sensory-rich contexts like robots, media, and Logo-style environments. Now, with affordable 3-D printers in the hands of consumers, we have a new medium in which learners may realize their computational ideas. In","authors_text":"Chris Johnson","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"cs.CY","submitted_at":"2013-09-27T23:50:57Z","title":"Madeup: A Mobile Development Environment for Programming 3-D Models"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1309.7391","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":"sha256:1b9950e84d63788ce7a3862244c03a3df61240e707a08006249027b77697e8ed","target":"record","created_at":"2026-05-18T03:11:58Z","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":"58a5be34081ca26bfdd1a1b09eb06ba50960b8c66060187a2868f76ba6d5a7d7","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/3.0/","primary_cat":"cs.CY","submitted_at":"2013-09-27T23:50:57Z","title_canon_sha256":"f5e232ba4a727d0bdd51baa66d6ff8031dc797e94a409d18bab790a333fed3ae"},"schema_version":"1.0","source":{"id":"1309.7391","kind":"arxiv","version":1}},"canonical_sha256":"e7a7ee214e6b932bfb4f41cb9a742ff4046abad3f661b8136705b0aa318dcf06","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e7a7ee214e6b932bfb4f41cb9a742ff4046abad3f661b8136705b0aa318dcf06","first_computed_at":"2026-05-18T03:11:58.858701Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:11:58.858701Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fOEUvYAIAcs+T+pPA30Z16vnxmclq2kH7+mhNT8F40xuIJmwFXt8JiNFQez4sPQgZRSNX6zTpKJcQ3k5EUYQAg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:11:58.859531Z","signed_message":"canonical_sha256_bytes"},"source_id":"1309.7391","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1b9950e84d63788ce7a3862244c03a3df61240e707a08006249027b77697e8ed","sha256:5df25b9b907481e49ec9203cc24b126ce37d02ea800c745d6ba54a9af44c0757"],"state_sha256":"cb7a3e3ea302dd951f1f4c358205be0f8f127c8546c67356044239a2afa954b9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wkZrHyeSHFLqUk9939WgHSMxANeQJ8if2Q8bSIGG/bUruTvisYgBaRWL+SUy5CsRzuU3G8UFcMHCLL6OkdNWAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T17:41:07.074789Z","bundle_sha256":"bdac185e1fdd1a05b0aae7b65b406377da062cad96ea145dd4cc4acb2ccd6bb7"}}