{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:XPYIUJK2HWCDCSZFUDICHNINMA","short_pith_number":"pith:XPYIUJK2","canonical_record":{"source":{"id":"1702.07437","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CY","submitted_at":"2017-02-24T01:32:02Z","cross_cats_sorted":["cs.HC","cs.MM","cs.SI"],"title_canon_sha256":"e10c83492430e093bcc89e6346619d8f81d49f5aa85548e72d560e31ef6fa258","abstract_canon_sha256":"a9405f10795d6c8d6ea3f28bb19f0b192964e6c9f43c2cb5acc846ae392b03da"},"schema_version":"1.0"},"canonical_sha256":"bbf08a255a3d84314b25a0d023b50d602855d6785f46dcdbef3cc778c09c7c91","source":{"kind":"arxiv","id":"1702.07437","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1702.07437","created_at":"2026-05-18T00:50:03Z"},{"alias_kind":"arxiv_version","alias_value":"1702.07437v1","created_at":"2026-05-18T00:50:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1702.07437","created_at":"2026-05-18T00:50:03Z"},{"alias_kind":"pith_short_12","alias_value":"XPYIUJK2HWCD","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_16","alias_value":"XPYIUJK2HWCDCSZF","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_8","alias_value":"XPYIUJK2","created_at":"2026-05-18T12:31:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:XPYIUJK2HWCDCSZFUDICHNINMA","target":"record","payload":{"canonical_record":{"source":{"id":"1702.07437","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CY","submitted_at":"2017-02-24T01:32:02Z","cross_cats_sorted":["cs.HC","cs.MM","cs.SI"],"title_canon_sha256":"e10c83492430e093bcc89e6346619d8f81d49f5aa85548e72d560e31ef6fa258","abstract_canon_sha256":"a9405f10795d6c8d6ea3f28bb19f0b192964e6c9f43c2cb5acc846ae392b03da"},"schema_version":"1.0"},"canonical_sha256":"bbf08a255a3d84314b25a0d023b50d602855d6785f46dcdbef3cc778c09c7c91","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:50:03.353547Z","signature_b64":"F0UfDefgGPSunLZis4RAfY8sJ8sZGWOtM1FG4EbY6KpeosH3UanJGS8qsxL+N2TmAV1QYN6JbpfmbbUkhxUhDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bbf08a255a3d84314b25a0d023b50d602855d6785f46dcdbef3cc778c09c7c91","last_reissued_at":"2026-05-18T00:50:03.352868Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:50:03.352868Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1702.07437","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":"2026-05-18T00:50:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FwVx3ZkARefvSo26DvEXGPu3FqUUMud3JeKu/R0fUVQ3DEGu61jCwX0kkde5F92G9QPPBoGmEiZ30MxNLGSvCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T20:05:07.554860Z"},"content_sha256":"40bf26d5d54c9d6b08200a86ac920cae161d1ec807cb704503aa6f9836db7ada","schema_version":"1.0","event_id":"sha256:40bf26d5d54c9d6b08200a86ac920cae161d1ec807cb704503aa6f9836db7ada"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:XPYIUJK2HWCDCSZFUDICHNINMA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"How Gamification Affects Physical Activity: Large-scale Analysis of Walking Challenges in a Mobile Application","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.HC","cs.MM","cs.SI"],"primary_cat":"cs.CY","authors_text":"Ali Shameli, Amin Saberi, Jure Leskovec, Tim Althoff","submitted_at":"2017-02-24T01:32:02Z","abstract_excerpt":"Gamification represents an effective way to incentivize user behavior across a number of computing applications. However, despite the fact that physical activity is essential for a healthy lifestyle, surprisingly little is known about how gamification and in particular competitions shape human physical activity. Here we study how competitions affect physical activity. We focus on walking challenges in a mobile activity tracking application where multiple users compete over who takes the most steps over a predefined number of days. We synthesize our findings in a series of game and app design i"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1702.07437","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":"2026-05-18T00:50:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4pa6ooUlGBLTXYGFTKGxxFeFqGRJZYObQD5COngLNln5KQPHeEj9sz1LeEl5ENUq6fr1EpTHtUPY7gepuWT+Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T20:05:07.555615Z"},"content_sha256":"8918e12d3f54ea459d4da8f79951d1fae71b3c0af15981d46943c8a49fcf05aa","schema_version":"1.0","event_id":"sha256:8918e12d3f54ea459d4da8f79951d1fae71b3c0af15981d46943c8a49fcf05aa"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XPYIUJK2HWCDCSZFUDICHNINMA/bundle.json","state_url":"https://pith.science/pith/XPYIUJK2HWCDCSZFUDICHNINMA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XPYIUJK2HWCDCSZFUDICHNINMA/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":"2026-05-31T20:05:07Z","links":{"resolver":"https://pith.science/pith/XPYIUJK2HWCDCSZFUDICHNINMA","bundle":"https://pith.science/pith/XPYIUJK2HWCDCSZFUDICHNINMA/bundle.json","state":"https://pith.science/pith/XPYIUJK2HWCDCSZFUDICHNINMA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XPYIUJK2HWCDCSZFUDICHNINMA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:XPYIUJK2HWCDCSZFUDICHNINMA","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":"a9405f10795d6c8d6ea3f28bb19f0b192964e6c9f43c2cb5acc846ae392b03da","cross_cats_sorted":["cs.HC","cs.MM","cs.SI"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CY","submitted_at":"2017-02-24T01:32:02Z","title_canon_sha256":"e10c83492430e093bcc89e6346619d8f81d49f5aa85548e72d560e31ef6fa258"},"schema_version":"1.0","source":{"id":"1702.07437","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1702.07437","created_at":"2026-05-18T00:50:03Z"},{"alias_kind":"arxiv_version","alias_value":"1702.07437v1","created_at":"2026-05-18T00:50:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1702.07437","created_at":"2026-05-18T00:50:03Z"},{"alias_kind":"pith_short_12","alias_value":"XPYIUJK2HWCD","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_16","alias_value":"XPYIUJK2HWCDCSZF","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_8","alias_value":"XPYIUJK2","created_at":"2026-05-18T12:31:56Z"}],"graph_snapshots":[{"event_id":"sha256:8918e12d3f54ea459d4da8f79951d1fae71b3c0af15981d46943c8a49fcf05aa","target":"graph","created_at":"2026-05-18T00:50:03Z","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":"Gamification represents an effective way to incentivize user behavior across a number of computing applications. However, despite the fact that physical activity is essential for a healthy lifestyle, surprisingly little is known about how gamification and in particular competitions shape human physical activity. Here we study how competitions affect physical activity. We focus on walking challenges in a mobile activity tracking application where multiple users compete over who takes the most steps over a predefined number of days. We synthesize our findings in a series of game and app design i","authors_text":"Ali Shameli, Amin Saberi, Jure Leskovec, Tim Althoff","cross_cats":["cs.HC","cs.MM","cs.SI"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CY","submitted_at":"2017-02-24T01:32:02Z","title":"How Gamification Affects Physical Activity: Large-scale Analysis of Walking Challenges in a Mobile Application"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1702.07437","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":"sha256:40bf26d5d54c9d6b08200a86ac920cae161d1ec807cb704503aa6f9836db7ada","target":"record","created_at":"2026-05-18T00:50:03Z","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":"a9405f10795d6c8d6ea3f28bb19f0b192964e6c9f43c2cb5acc846ae392b03da","cross_cats_sorted":["cs.HC","cs.MM","cs.SI"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CY","submitted_at":"2017-02-24T01:32:02Z","title_canon_sha256":"e10c83492430e093bcc89e6346619d8f81d49f5aa85548e72d560e31ef6fa258"},"schema_version":"1.0","source":{"id":"1702.07437","kind":"arxiv","version":1}},"canonical_sha256":"bbf08a255a3d84314b25a0d023b50d602855d6785f46dcdbef3cc778c09c7c91","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bbf08a255a3d84314b25a0d023b50d602855d6785f46dcdbef3cc778c09c7c91","first_computed_at":"2026-05-18T00:50:03.352868Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:50:03.352868Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"F0UfDefgGPSunLZis4RAfY8sJ8sZGWOtM1FG4EbY6KpeosH3UanJGS8qsxL+N2TmAV1QYN6JbpfmbbUkhxUhDA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:50:03.353547Z","signed_message":"canonical_sha256_bytes"},"source_id":"1702.07437","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:40bf26d5d54c9d6b08200a86ac920cae161d1ec807cb704503aa6f9836db7ada","sha256:8918e12d3f54ea459d4da8f79951d1fae71b3c0af15981d46943c8a49fcf05aa"],"state_sha256":"86715cf2754a1ab3781c7f5c5f40146d32e2fc57a391018123159cf4b738f251"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zcKz0nmE/CFzgX34RpZYspmwhGOcBOncGJPNkYKtQLpE6h87XpIbW5YIt2gNgf7aRlwsxG+s0cPffIBjI9uLDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T20:05:07.559633Z","bundle_sha256":"c6ffb69d71ec4ee2896026f79c1083356ea7776dd705489d2aacf886f7ed09d2"}}