{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:THLCSM4KOIQ7CQKKINRB2U444J","short_pith_number":"pith:THLCSM4K","canonical_record":{"source":{"id":"2507.08876","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.soc-ph","submitted_at":"2025-07-10T04:24:03Z","cross_cats_sorted":["q-bio.PE"],"title_canon_sha256":"e19ce84b3487adb19096ec9ab342cd99b796f3460f4f92f05f040ded04fbe27a","abstract_canon_sha256":"35f6c7be3fef7070d2df2c80ec6d29895fc45e4cdc60f276664a8f06c40ca286"},"schema_version":"1.0"},"canonical_sha256":"99d629338a7221f1414a43621d539ce25194d9f6da80b2520a413bd61c5b9c01","source":{"kind":"arxiv","id":"2507.08876","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.08876","created_at":"2026-07-05T11:35:59Z"},{"alias_kind":"arxiv_version","alias_value":"2507.08876v1","created_at":"2026-07-05T11:35:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.08876","created_at":"2026-07-05T11:35:59Z"},{"alias_kind":"pith_short_12","alias_value":"THLCSM4KOIQ7","created_at":"2026-07-05T11:35:59Z"},{"alias_kind":"pith_short_16","alias_value":"THLCSM4KOIQ7CQKK","created_at":"2026-07-05T11:35:59Z"},{"alias_kind":"pith_short_8","alias_value":"THLCSM4K","created_at":"2026-07-05T11:35:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:THLCSM4KOIQ7CQKKINRB2U444J","target":"record","payload":{"canonical_record":{"source":{"id":"2507.08876","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.soc-ph","submitted_at":"2025-07-10T04:24:03Z","cross_cats_sorted":["q-bio.PE"],"title_canon_sha256":"e19ce84b3487adb19096ec9ab342cd99b796f3460f4f92f05f040ded04fbe27a","abstract_canon_sha256":"35f6c7be3fef7070d2df2c80ec6d29895fc45e4cdc60f276664a8f06c40ca286"},"schema_version":"1.0"},"canonical_sha256":"99d629338a7221f1414a43621d539ce25194d9f6da80b2520a413bd61c5b9c01","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:35:59.855643Z","signature_b64":"Te/+TrbbH/iezCIY6KOOVoLGDTIDTQwChISZb93NNkuo86cAnp1il1A4Kk+399kIUrdTz7+OZ95th4SIuY6MBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"99d629338a7221f1414a43621d539ce25194d9f6da80b2520a413bd61c5b9c01","last_reissued_at":"2026-07-05T11:35:59.855130Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:35:59.855130Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2507.08876","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":"2026-07-05T11:35:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AhvX2a9F9Zp3tZrs2DqqIprhE7Ai/WGmfPPAY1kMJcX9Cu084wwgATEixkFWIxED/lyigf5c0AXLx5jEooKCDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T12:18:00.099634Z"},"content_sha256":"8f8f47c5d08fe69600b91b2eadb163e9717528b4feeb2a866c769eb3f832aa03","schema_version":"1.0","event_id":"sha256:8f8f47c5d08fe69600b91b2eadb163e9717528b4feeb2a866c769eb3f832aa03"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:THLCSM4KOIQ7CQKKINRB2U444J","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Network reciprocity turns cheap talk into a force for cooperation","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["q-bio.PE"],"primary_cat":"physics.soc-ph","authors_text":"Chen Shen, The Anh Han, Zhao Song","submitted_at":"2025-07-10T04:24:03Z","abstract_excerpt":"Non-binding communication is common in daily life and crucial for fostering cooperation, even though it has no direct payoff consequences. However, despite robust empirical evidence, its evolutionary basis remains poorly understood. Here, we develop a game-theoretic model in which individuals can signal an intention to cooperate before playing a Donation game. Strategies differ in how they respond to these signals, ranging from unconditional to conditional types, with the latter incurring a cognitive cost for deliberation. Through evolutionary analysis, we show that non-binding communication a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.08876","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2507.08876/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T11:35:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DS2NUp2iTXxhMFPil9cH0va9HVkuyTP2K8RIVsZMoffph6LxRItOpJ24jVcBW6OlW9JX+G/lbXuwtITfPrsjAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T12:18:00.100240Z"},"content_sha256":"3004bd1c6e79fb436ef64bb79c6f75cc3f79bf87b7505ce5b6371053511bfa43","schema_version":"1.0","event_id":"sha256:3004bd1c6e79fb436ef64bb79c6f75cc3f79bf87b7505ce5b6371053511bfa43"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/THLCSM4KOIQ7CQKKINRB2U444J/bundle.json","state_url":"https://pith.science/pith/THLCSM4KOIQ7CQKKINRB2U444J/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/THLCSM4KOIQ7CQKKINRB2U444J/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":"2026-08-07T12:18:00Z","links":{"resolver":"https://pith.science/pith/THLCSM4KOIQ7CQKKINRB2U444J","bundle":"https://pith.science/pith/THLCSM4KOIQ7CQKKINRB2U444J/bundle.json","state":"https://pith.science/pith/THLCSM4KOIQ7CQKKINRB2U444J/state.json","well_known_bundle":"https://pith.science/.well-known/pith/THLCSM4KOIQ7CQKKINRB2U444J/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:THLCSM4KOIQ7CQKKINRB2U444J","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":"35f6c7be3fef7070d2df2c80ec6d29895fc45e4cdc60f276664a8f06c40ca286","cross_cats_sorted":["q-bio.PE"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.soc-ph","submitted_at":"2025-07-10T04:24:03Z","title_canon_sha256":"e19ce84b3487adb19096ec9ab342cd99b796f3460f4f92f05f040ded04fbe27a"},"schema_version":"1.0","source":{"id":"2507.08876","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2507.08876","created_at":"2026-07-05T11:35:59Z"},{"alias_kind":"arxiv_version","alias_value":"2507.08876v1","created_at":"2026-07-05T11:35:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2507.08876","created_at":"2026-07-05T11:35:59Z"},{"alias_kind":"pith_short_12","alias_value":"THLCSM4KOIQ7","created_at":"2026-07-05T11:35:59Z"},{"alias_kind":"pith_short_16","alias_value":"THLCSM4KOIQ7CQKK","created_at":"2026-07-05T11:35:59Z"},{"alias_kind":"pith_short_8","alias_value":"THLCSM4K","created_at":"2026-07-05T11:35:59Z"}],"graph_snapshots":[{"event_id":"sha256:3004bd1c6e79fb436ef64bb79c6f75cc3f79bf87b7505ce5b6371053511bfa43","target":"graph","created_at":"2026-07-05T11:35:59Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2507.08876/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Non-binding communication is common in daily life and crucial for fostering cooperation, even though it has no direct payoff consequences. However, despite robust empirical evidence, its evolutionary basis remains poorly understood. Here, we develop a game-theoretic model in which individuals can signal an intention to cooperate before playing a Donation game. Strategies differ in how they respond to these signals, ranging from unconditional to conditional types, with the latter incurring a cognitive cost for deliberation. Through evolutionary analysis, we show that non-binding communication a","authors_text":"Chen Shen, The Anh Han, Zhao Song","cross_cats":["q-bio.PE"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.soc-ph","submitted_at":"2025-07-10T04:24:03Z","title":"Network reciprocity turns cheap talk into a force for cooperation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2507.08876","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":"sha256:8f8f47c5d08fe69600b91b2eadb163e9717528b4feeb2a866c769eb3f832aa03","target":"record","created_at":"2026-07-05T11:35:59Z","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":"35f6c7be3fef7070d2df2c80ec6d29895fc45e4cdc60f276664a8f06c40ca286","cross_cats_sorted":["q-bio.PE"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.soc-ph","submitted_at":"2025-07-10T04:24:03Z","title_canon_sha256":"e19ce84b3487adb19096ec9ab342cd99b796f3460f4f92f05f040ded04fbe27a"},"schema_version":"1.0","source":{"id":"2507.08876","kind":"arxiv","version":1}},"canonical_sha256":"99d629338a7221f1414a43621d539ce25194d9f6da80b2520a413bd61c5b9c01","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"99d629338a7221f1414a43621d539ce25194d9f6da80b2520a413bd61c5b9c01","first_computed_at":"2026-07-05T11:35:59.855130Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:35:59.855130Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Te/+TrbbH/iezCIY6KOOVoLGDTIDTQwChISZb93NNkuo86cAnp1il1A4Kk+399kIUrdTz7+OZ95th4SIuY6MBg==","signature_status":"signed_v1","signed_at":"2026-07-05T11:35:59.855643Z","signed_message":"canonical_sha256_bytes"},"source_id":"2507.08876","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8f8f47c5d08fe69600b91b2eadb163e9717528b4feeb2a866c769eb3f832aa03","sha256:3004bd1c6e79fb436ef64bb79c6f75cc3f79bf87b7505ce5b6371053511bfa43"],"state_sha256":"352c9e4298fed101211158dc6bef2610659376179d8d51f1e23d49e0672c0656"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"k7k1EBRafQopgV26gYTW/gGrZGnx5Pg+v1AHDLgKnYO2L+GPVC0ndQIdcg0+NaVaX7g7INq/I7pv7gJSc8Z0Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T12:18:00.107194Z","bundle_sha256":"abefb04c16fb89b03043b669f9cd256c888ec7693fd7c243c952ca2ed7be701d"}}