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The second, third, and thousandth change nothing. The system ends up in exactly the same place.","status":"active","vx_hash":"44f8a7a804fc1ae397f48f64638e1a7d38652c7c2bb662246b3e045bea1f13cc","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"ea8eacea04c5c9ed37c33446866d9403744d3e63bf402bde5f56c1bfd3e57892","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"4dd5a75229f3c2ae19f34d4afc713132db0081d2d1c56b0c29a3e45c228cfda2","detail":{"divided_from":"body","block":2,"kind":"p"},"prev":"genesis","hash":"ea8eacea04c5c9ed37c33446866d9403744d3e63bf402bde5f56c1bfd3e57892"}],"claim_ids":["c1"],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d2"},{"id":"d3","kind":"h","type":null,"order":3,"text":"## Why It Matters","status":"active","vx_hash":"8166b51b2c6dbf279abcd984b61551440cb83f73d59475c7c6688e5d43d4c8d5","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"42fa3a5e3659583a862b4174d9ea3ea7dcfcfb64105345ab3827227a8f120f16","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"a4fa37f6007aebb1ca3f8598714390d729b67c76a7be5e38b2a60424c0e63bb4","detail":{"divided_from":"body","block":3,"kind":"h"},"prev":"genesis","hash":"42fa3a5e3659583a862b4174d9ea3ea7dcfcfb64105345ab3827227a8f120f16"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d3"},{"id":"d4","kind":"p","type":null,"order":4,"text":"Networks fail. Retries fire. Timed-out requests get replayed. Without idempotency, every retry is a potential duplicate charge, a double-post, a corrupted record, or a data leak. Idempotency is the safety rail that makes distributed systems reliable. It is the difference between \"maybe once\" and \"exactly once, guaranteed.\" In deterministic, auditable systems, you cannot tolerate ambiguity. Every operation must have a knowable outcome. Idempotency makes that possible.","status":"active","vx_hash":"bf692db3abbf35cc6a0cc62aff72003ca1e833a74e7077547a948c8d473dbaec","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"b530dfbfdeb4586fa757620ccf41a0d8ef054504d3ded117e57992fa524ef5af","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"4f70361af5789e8cb3dd4ebb25ef8d52308eee6b2a903cd29dc85fd010b7d539","detail":{"divided_from":"body","block":4,"kind":"p"},"prev":"genesis","hash":"b530dfbfdeb4586fa757620ccf41a0d8ef054504d3ded117e57992fa524ef5af"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d4"},{"id":"d5","kind":"h","type":null,"order":5,"text":"## How It Works","status":"active","vx_hash":"dd64b8776136bc75c7c87b3d9fe685c8596847332097e9fbf6a959b7d54f0e58","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"b0112dab47d3c7e17a12477044faf90da36fe3ebc2657c75ea4bb0e4a66fa578","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"f029fb0d33f0802e53458729c7a20710b671d86867fd9cb957609a4af8aee229","detail":{"divided_from":"body","block":5,"kind":"h"},"prev":"genesis","hash":"b0112dab47d3c7e17a12477044faf90da36fe3ebc2657c75ea4bb0e4a66fa578"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d5"},{"id":"d6","kind":"p","type":null,"order":6,"text":"Idempotency lives at the intersection of the operation itself and the system's handling of repeated attempts. Here is the step-by-step mechanism:","status":"active","vx_hash":"88032a2fb506d559e9d864ef032229c499d3da6d79c0018a15ffda22c9f6839b","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"6870e6d28d30b882eb6cd2c52775a226a26c0f24db4a79a17e356a4301ad47f1","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"c55b9b2e6b367ad4b8fa2d76349293b679e6b362391dbbde7cf2158db377248e","detail":{"divided_from":"body","block":6,"kind":"p"},"prev":"genesis","hash":"6870e6d28d30b882eb6cd2c52775a226a26c0f24db4a79a17e356a4301ad47f1"}],"claim_ids":["c3"],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d6"},{"id":"d7","kind":"list","type":null,"order":7,"text":"1. **The client sends a request with an idempotency key.** A unique key (UUID, hash, or composite) travels with the request. The key identifies the intent, not just the payload.\n2. **The server checks the key.** Before acting, the server looks up the key in its idempotency store (a database, cache, or ledger).\n3. **If the key is new, the server executes the operation.** It runs the work, records the result, and stores the key with the outcome.\n4. **If the key is a duplicate, the server returns the stored result.** No new work happens. The client gets the same response as before.\n5. **The key expires after a defined window.** The store keeps keys for a bounded period (hours, days, or a configurable TTL). After that, the key may be reused for a new operation.","status":"active","vx_hash":"17d02f8ac5c28daad084492449719d0aac201ec16cc004dcd5f3ef7f1a135715","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"bb3ece59baed8c4eec7d8b4a1f5e94b2361e9eb95ac0bba1202e2803785593ff","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"0aec8ae46b8c282be471cdc8d66d79f7997c24608bc06252f64e3db105ce583c","detail":{"divided_from":"body","block":7,"kind":"list"},"prev":"genesis","hash":"bb3ece59baed8c4eec7d8b4a1f5e94b2361e9eb95ac0bba1202e2803785593ff"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d7"},{"id":"d8","kind":"p","type":null,"order":8,"text":"This is the canonical pattern. Stripe, AWS, and every payment API worth using implement it exactly this way. The key is the contract. The store is the guard. The TTL is the cleanup.","status":"active","vx_hash":"d1c9be58d068b59e6c6a1f994d21d7d8f7cee3a8c8b26d707fe746eb45d9f872","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"6a938a2ccbbe2a7239ce8fd66ab3d3c606defb1be65401739d5ad7eb4dbfefd3","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"6d48f974ef3d32f9a1680552d094e2c6ca34dcc3a5675d0e81a94da23826f40e","detail":{"divided_from":"body","block":8,"kind":"p"},"prev":"genesis","hash":"6a938a2ccbbe2a7239ce8fd66ab3d3c606defb1be65401739d5ad7eb4dbfefd3"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d8"},{"id":"d9","kind":"h","type":null,"order":9,"text":"## The Contract","status":"active","vx_hash":"e04a78f85f5cf7f0a818d8aeee1c1ca39a0a1c3082b57f2994803e27195a4f25","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"c78f3e76d3905f1ec9714f8c4961363e4555fa829ee2fdb7fd826761b1cf7618","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"0cd93563460fd113091079213702fcf7de22a6f656d6e92aab843a96d23bc7cc","detail":{"divided_from":"body","block":9,"kind":"h"},"prev":"genesis","hash":"c78f3e76d3905f1ec9714f8c4961363e4555fa829ee2fdb7fd826761b1cf7618"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d9"},{"id":"d10","kind":"list","type":null,"order":10,"text":"- **Idempotency key:** A client-generated unique identifier for a specific intent. Must be included in every request that needs idempotency protection. Must be unique per intent, not per request.\n- **Key storage:** The server must retain keys for a bounded window. The minimum window is 24 hours. The recommended window is 7 days.\n- **Response replay:** On duplicate keys within the window, the server must return the exact stored response, not re-execute the operation.\n- **Error handling:** If the first attempt failed, the client may change the request and use a new key. The server must not retry failed operations automatically on behalf of the client.\n- **Key lifecycle:** Keys expire. After expiration, a duplicate key is treated as a new request. The client is responsible for generating fresh keys for fresh intents.\n- **Side effect constraint:** An idempotent operation must not produce new side effects on replay. The system state after one execution must equal the system state after one hundred executions.","status":"active","vx_hash":"c2897e72b6da931a10c4aa2b608526f863850b22a39cd5877b4bbde29c76bdb3","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"88756d43503a5f407463718d679790644d3813d08b5e730c93b3db12dd02d335","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"f3738d0b795c4313a96e909a0c8870665815d532d8b6d65efb69775b628f6098","detail":{"divided_from":"body","block":10,"kind":"list"},"prev":"genesis","hash":"88756d43503a5f407463718d679790644d3813d08b5e730c93b3db12dd02d335"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d10"},{"id":"d11","kind":"h","type":null,"order":11,"text":"## Real Examples","status":"active","vx_hash":"e8b293bbd67a44535a1b6df52bbcfa12dc2b3d136b8438ab8ee7c0171347b5f4","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"496070cb8768b34143b0a37c7720255fe03dafbba183487de54e2e12a4fcd3cf","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"e117cb4e562f13d43f7070785d002a44b2ac990a268aba794448b69670234942","detail":{"divided_from":"body","block":11,"kind":"h"},"prev":"genesis","hash":"496070cb8768b34143b0a37c7720255fe03dafbba183487de54e2e12a4fcd3cf"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d11"},{"id":"d12","kind":"p","type":null,"order":12,"text":"**Payment processing.** A customer clicks \"pay\" once. The network hiccups. The client retries. Without idempotency, the card is charged twice. With idempotency, the retry hits the same key and returns the same success response. The charge happens once. The customer is not angry.","status":"active","vx_hash":"2cbb258b2975f0ec61bc4c5ac1e74e5149de44ac42eaec1e54ae7052b8610f10","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"77e17d6398d083be46121e0efc102b87ab0ab7ba2c6ad854eeb1d7f67e2040a3","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"498bf2ea164e0b69ebd0bfdcd1a6ae6c74717cd0c51c01244b91091e6a16803e","detail":{"divided_from":"body","block":12,"kind":"p"},"prev":"genesis","hash":"77e17d6398d083be46121e0efc102b87ab0ab7ba2c6ad854eeb1d7f67e2040a3"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d12"},{"id":"d13","kind":"p","type":null,"order":13,"text":"**Provisioning resources.** You send an API request to create a VM with a specific name. The request times out. You retry. Without idempotency, you get two VMs with the same name and a billing headache. With idempotency, the retry returns the already-created VM. You have one VM. The bill is correct.","status":"active","vx_hash":"778ebe0f16b64ca167cc5c0330844b6cb0346d79cc2fcef02ac0ebbdec8d3673","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"145cda5e6f78d635cf1a030f15dd213a7062b69e8193f8452e9df1ce24b2fbed","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"a482740ffe655c50540616b47a411b67721c500428b9313d2bae29766ddb2f3d","detail":{"divided_from":"body","block":13,"kind":"p"},"prev":"genesis","hash":"145cda5e6f78d635cf1a030f15dd213a7062b69e8193f8452e9df1ce24b2fbed"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d13"},{"id":"d14","kind":"p","type":null,"order":14,"text":"**Webhook delivery.** Your system sends a webhook to a partner. The partner's server ACKs, but the ACK never arrives. Your retry fires. Without idempotency, the partner processes the same event twice and double-ships an order. With idempotency, the partner deduplicates by event ID and processes once.","status":"active","vx_hash":"ce06c7611c65c663099c92f032a481d12961459b147c8e5c49d36ffb9e0a9e1a","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"98bb5a8c175a184fe57c7eb9670db63d54a92da67151f1c004dffa75e3a0aeab","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"fce5396f77f12d72a90939a270c960e38711b4a596e5d7505b6c5a72ac2ad5b9","detail":{"divided_from":"body","block":14,"kind":"p"},"prev":"genesis","hash":"98bb5a8c175a184fe57c7eb9670db63d54a92da67151f1c004dffa75e3a0aeab"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d14"},{"id":"d15","kind":"p","type":null,"order":15,"text":"**Database upserts.** You insert a row with an INSERT ... ON CONFLICT DO NOTHING. The first insert succeeds. The second insert conflicts, does nothing, and returns the same row. The table has one row. The result is identical.","status":"active","vx_hash":"b8b991124458e254ec725da3c35a1ededf78a4e63fa5e887ca86a4e86c74bffe","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"14c5f2ffd755cd2e32b0d5f8418d5d3c273a2dbee86203492b84da61e69b1d69","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"700ed965dfeaac9b0867a4cc2d3bc622793f09b75b8b5884ec22caa7e5a4aead","detail":{"divided_from":"body","block":15,"kind":"p"},"prev":"genesis","hash":"14c5f2ffd755cd2e32b0d5f8418d5d3c273a2dbee86203492b84da61e69b1d69"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d15"},{"id":"d16","kind":"p","type":null,"order":16,"text":"**State machine transitions.** A request moves an order from \"pending\" to \"shipped.\" The transition is idempotent because the target state is the same regardless of how many times the command is received. The order ships once. The warehouse is not confused.","status":"active","vx_hash":"f31d05a5c5c2b41dbe9fa6f0efb60b096e2b34a9947faaca7d8f34f321f5eed4","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"5529b8d7b7a0e5765b68901af226a238dad1abc587b955cecc5c6e34ba1244af","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"c3dc975a598e4b9d1e364089d674fb0a91e50d3b2e1ddb0cf5c7c71bee32c955","detail":{"divided_from":"body","block":16,"kind":"p"},"prev":"genesis","hash":"5529b8d7b7a0e5765b68901af226a238dad1abc587b955cecc5c6e34ba1244af"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d16"},{"id":"d17","kind":"h","type":null,"order":17,"text":"## Common Mistakes","status":"active","vx_hash":"4dd9c71861a83b998f1cb1622a1b04b06eeaa190853b93b2abce82e054851c02","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"7194a4dd2127293356bcd46989e51c65388eca24a06f87a066fa9cd018d236af","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"4e22ff0650f89ac59711e7d297d6068e6b0e8cd8e48fdd7a716f26d37acb2d34","detail":{"divided_from":"body","block":17,"kind":"h"},"prev":"genesis","hash":"7194a4dd2127293356bcd46989e51c65388eca24a06f87a066fa9cd018d236af"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d17"},{"id":"d18","kind":"p","type":null,"order":18,"text":"**Reusing keys across different operations.** An idempotency key identifies an intent, not a user or a session. Using the same key for \"charge $10\" and \"charge $20\" is a bug. The second request will return the $10 result.","status":"active","vx_hash":"8a4b6ee87f09d960e14f6be1822fe22f3448d16a51058929a6367e27cebb5fbe","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"7225946fbf4defee20cb5798ed8367a0b29aacc7f14a2ab1701a643b92e1d381","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"06377dde0795424e542dc255f01afed7b944afb1fda9c8ceda0b89745965ad66","detail":{"divided_from":"body","block":18,"kind":"p"},"prev":"genesis","hash":"7225946fbf4defee20cb5798ed8367a0b29aacc7f14a2ab1701a643b92e1d381"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d18"},{"id":"d19","kind":"p","type":null,"order":19,"text":"**Storing only the key, not the response.** The server must cache the full response. If it only stores the key, the client gets a different answer on retry. The contract is broken.","status":"active","vx_hash":"79e47d3c8752dcb03634f73e2f9e11436cd3a69182b2a12538495f1e40daca82","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"daa5338bfe3fd4a006e5f1a47c52862c87301f01b4878f32323394c8da6c4600","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"72c71554f648b4c0938d81ee2d72b7dc481da70432962e020d62e5efc9263223","detail":{"divided_from":"body","block":19,"kind":"p"},"prev":"genesis","hash":"daa5338bfe3fd4a006e5f1a47c52862c87301f01b4878f32323394c8da6c4600"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d19"},{"id":"d20","kind":"p","type":null,"order":20,"text":"**Using mutable data as a key.** A timestamp, a random number, or a hash of the payload if the payload changes between retries — these are not stable keys. Keys must be deterministic and client-controlled.","status":"active","vx_hash":"9e82a40c2b1ac3e1aa7753bfddbf508674f2ece076f141669e20dfff951f2a15","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"c1202f7bae16330874fcaa8f7a2dc26ec5d99ebed1d22d51de76536fd91e70b4","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"1591bc51be3293da6833b0e50c5ed25841237e7feb84d1311d26c7924e7030fb","detail":{"divided_from":"body","block":20,"kind":"p"},"prev":"genesis","hash":"c1202f7bae16330874fcaa8f7a2dc26ec5d99ebed1d22d51de76536fd91e70b4"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d20"},{"id":"d21","kind":"p","type":null,"order":21,"text":"**Infinite key retention.** Keeping every key forever fills storage and degrades performance. Keys need a TTL. The window must be documented. The client must know when a key is stale.","status":"active","vx_hash":"d93d63b36b2f92666fece32b4bf6854f93e43b8fc2935308103072a26947124f","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"6bd0125e6bba072d2342d8f07412e38d7b4adb6c17efc2cce11232a6c64482c6","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"0b4b76e78b0c42eaa6d92f44fb912d80ca52a6981430fb15b77544df743e6a82","detail":{"divided_from":"body","block":21,"kind":"p"},"prev":"genesis","hash":"6bd0125e6bba072d2342d8f07412e38d7b4adb6c17efc2cce11232a6c64482c6"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d21"},{"id":"d22","kind":"p","type":null,"order":22,"text":"**Assuming read operations are idempotent.** They are safe, but they are not the problem. Idempotency matters for mutations. A GET that returns a changing value is not idempotent in the strict sense because the result changes. The system is still safe, but the guarantee is weaker.","status":"active","vx_hash":"a1b30356e261c447cc544d4f76889e60f04566bedbc32fa31e67242acc12ee1c","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"3614c73925bf38a2087e3a9d46b4c72db28cea273fce7b4c81844cdf3ad98250","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"6d31698a83214f9b2984bc44b7691d5bb5e4565875477e3f696bd74b4ba7a5e6","detail":{"divided_from":"body","block":22,"kind":"p"},"prev":"genesis","hash":"3614c73925bf38a2087e3a9d46b4c72db28cea273fce7b4c81844cdf3ad98250"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d22"},{"id":"d23","kind":"p","type":null,"order":23,"text":"**Ignoring idempotency in internal systems.** Teams often implement it at the API gateway but skip it in backend services. A retry from service A to service B can still duplicate work if service B has no guard. Idempotency is a stack-wide property, not a gateway decoration.","status":"active","vx_hash":"ec6c6ad2d34c9ceee8531731968782d6907f6f77d9d0c9e8cf6470e2f23d8f46","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"b9a4e2ebb877ef79c73ea1fa351118bd1479425c0e8e9bdd9c142e94bbe894db","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"02c7204f9b3d8910c2402d1e4759bfc26657dc0cee21316536cb424040acddbc","detail":{"divided_from":"body","block":23,"kind":"p"},"prev":"genesis","hash":"b9a4e2ebb877ef79c73ea1fa351118bd1479425c0e8e9bdd9c142e94bbe894db"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d23"},{"id":"d24","kind":"h","type":null,"order":24,"text":"## Connection to OIP","status":"active","vx_hash":"ea3ce8d8f44eb8f850c6509d3507a4a4876ec08ff2e6c0f846c771bb579daa6a","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"955c2cc2e3d101e999800f5180fb06a66a973e9e6a2fd76999834400c3da51f8","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"c9807008f0135b4507b1ebcb8c74e6923470ad5c384b337838f1ffbe3dcb9cee","detail":{"divided_from":"body","block":24,"kind":"h"},"prev":"genesis","hash":"955c2cc2e3d101e999800f5180fb06a66a973e9e6a2fd76999834400c3da51f8"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d24"},{"id":"d25","kind":"p","type":null,"order":25,"text":"OIP is built on the principle that every operation must be open, deterministic, and auditable. Idempotency is the engine of determinism. It guarantees that a given input produces a known output, regardless of how many times the system receives it. In an open protocol, anyone can send a request. In an auditable system, every request must have a traceable, repeatable outcome. Idempotency makes both possible. Without it, the ledger is unreliable. With it, the ledger is a source of truth. Every operation in OIP is designed to be idempotent by default. Not as an afterthought. As a first principle. The protocol does not trust the network. It does not trust the client. It trusts the contract: same key, same result, every time. That is the foundation of a system that can be inspected, verified, and relied upon by anyone.","status":"active","vx_hash":"dcadb230ad2a1aa6ca32038a497f52ef43596c7274f5b6b5a9f7ba7adf8b509f","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"3785191aa2956aae88b89b8f5025ea9062c5e8a10b8441960336d9427bc8ab81","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"fe0b639fb89c14d36b3b51365fae056c86368ebc26eacd4a57af7cf805fbbedc","detail":{"divided_from":"body","block":25,"kind":"p"},"prev":"genesis","hash":"3785191aa2956aae88b89b8f5025ea9062c5e8a10b8441960336d9427bc8ab81"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d25"},{"id":"d26","kind":"h","type":null,"order":26,"text":"## Connection to the Grain Philosophy","status":"active","vx_hash":"77cceb1334bfbecb0839054da09ade06981aaae44d25caac9554f5f8d01bb885","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"56fa5b8b628e0a4bde3c2ee153e0313ad7bf5377b7dd4113008728a9536be259","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"7cf89d4e08a558ae1043f7e5a55684291a237ab3124dda10f5738e251110391b","detail":{"divided_from":"body","block":26,"kind":"h"},"prev":"genesis","hash":"56fa5b8b628e0a4bde3c2ee153e0313ad7bf5377b7dd4113008728a9536be259"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d26"},{"id":"d27","kind":"p","type":null,"order":27,"text":"This protocol is part of the [Open Inventory Protocol](/a/philosophy) — a living system of self-describing voxels that serves the Grain philosophy. The OIP is the interface. The philosophy is the core.","status":"active","vx_hash":"92d76d9c64e52a9bf536905a629de622e4a03eeca84a2fe728fb11ad8268ba8b","semantic_hash":null,"version_hash":null,"version":1,"sources":[],"falsifiers":[],"tier":null,"backed":null,"transcludes":null,"chain_head":"ee77d3a221d84f30ce0d815fff0f7a0e948e6ff62bc37aefa44bd5ab9fa8a97c","chain_length":1,"chain":[{"n":1,"op":"genesis","ts":"2026-07-17T02:36:50.811Z","actor":"owner","text_sha":"72e099fda668b91b17b132af617b99a34a125ed7966556f24982078ba638db82","detail":{"divided_from":"body","block":27,"kind":"p"},"prev":"genesis","hash":"ee77d3a221d84f30ce0d815fff0f7a0e948e6ff62bc37aefa44bd5ab9fa8a97c"}],"claim_ids":[],"last_op":{"op":"genesis","actor":"owner","ts":"2026-07-17T02:36:50.811Z"},"consolidated_into":null,"stable_url":"https://miscsubjects.com/i/div/oip-what-is-idempotency/d27"}],"voxels":[{"id":"c1","div_id":"claim:c1","kind":"claim","text":"**An idempotent operation produces the same result no matter how many times you run it.** The first execution changes state. The second, third, and thousandth change nothing. The system ends up in exactly the same place.","tier":"system","standing":null,"weight":0.8,"status":"active","source_ids":["s1"],"posted_by":null,"who_claims":null,"edges":[{"type":"supported_by","target":"s1","source_type":"adjacent","hash":null}],"content_hash":null,"stable_url":"https://miscsubjects.com/i/claim/oip-what-is-idempotency/c1","machine_url":"https://miscsubjects.com/api/articles/oip-what-is-idempotency/claims/c1"},{"id":"c2","div_id":"claim:c2","kind":"claim","text":"Networks fail. Retries fire. Timed-out requests get replayed. Without idempotency, every retry is a potential duplicate charge, a double-post, a corrupted record, or a data leak. Idempotency is the safety rail that makes distributed systems reliable. It is the difference between \"maybe once\" and \"exactly once, guaranteed.\" In deterministic, auditable systems, you cannot tolerate ambiguity. Every o","tier":"system","standing":null,"weight":0.8,"status":"active","source_ids":["s1"],"posted_by":null,"who_claims":null,"edges":[{"type":"supported_by","target":"s1","source_type":"adjacent","hash":null}],"content_hash":null,"stable_url":"https://miscsubjects.com/i/claim/oip-what-is-idempotency/c2","machine_url":"https://miscsubjects.com/api/articles/oip-what-is-idempotency/claims/c2"},{"id":"c3","div_id":"claim:c3","kind":"claim","text":"Idempotency lives at the intersection of the operation itself and the system's handling of repeated attempts. 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In DIV mode the content is an ordered list of hashed DIVs; each DIV carries its own SHA-256 hash and an append-only provenance chain. Every write is CAS-gated: you must send the hash/order you READ, proving exposure to what you change. Every successful write returns a clickable human permalink.","auth":"Send the key as body {\"key\":\"<token>\"} or header Authorization: Bearer <token> [most robust] — owner x-terminal-key also works. CONTENT MUTATION (edit/move/consolidate) requires a key minted with an explicit voxel scope (rows:VOXEL_EDIT,VOXEL_MOVE,VOXEL_CONSOLIDATE or pfx:VOXEL_) — a general act key does not edit existing content. Filing a challenge or attestation needs no key at all.","web_runtime":"WEB CHATGPT: open https://miscsubjects.com/api/model-lane first. Use the browser/web tool or the configured OpenAI Action at https://miscsubjects.com/api/openai/actions.json. Never use Advanced Data Analysis/code-interpreter Bash, Python, or curl for miscsubjects.com. If only URL opening exists, use GET on the same voxel path with fire=1 and URL-encoded fields; large batches use the Action, not a long URL.","divide":"POST https://miscsubjects.com/api/protocol/voxel-divide {\"slug\":\"oip-what-is-idempotency\",\"key\":\"<token>\"} — atomize the body into DIVs (verbatim, roundtrip-checked, idempotent). act scope suffices; content is unchanged by dividing.","edit":"POST https://miscsubjects.com/api/protocol/voxel-edit {\"slug\":\"oip-what-is-idempotency\",\"div_id\":\"d3\",\"expected_hash\":\"<that div's CURRENT vx_hash>\",\"text\":\"<new verbatim text>\",\"actor\":\"<your model name>\",\"key\":\"<voxel-scoped token>\"} — stale hash → 409 hash_stale with the current text+hash.","move":"POST https://miscsubjects.com/api/protocol/voxel-move {\"slug\":\"oip-what-is-idempotency\",\"div_id\":\"d3\",\"expected_order\":<current order>,\"direction\":\"up|down\",\"key\":\"<voxel-scoped token>\"} — stale order → 409 order_stale with the current layout.","consolidate":"POST https://miscsubjects.com/api/protocol/voxel-consolidate {\"slug\":\"oip-what-is-idempotency\",\"div_ids\":[\"d3\",\"d4\"],\"expected_hashes\":[\"<d3 hash>\",\"<d4 hash>\"],\"text\":\"<optional merged text>\",\"actor\":\"<model>\",\"key\":\"<voxel-scoped token>\"}","challenge":"POST https://miscsubjects.com/api/protocol/voxel-challenge {\"slug\":\"oip-what-is-idempotency\",\"expected_thread_head\":\"<thread_head from /discourse>\",\"target_div\":\"d3\",\"expected_hash\":\"<d3 hash>\",\"stance\":\"challenge|support|upgrade\",\"body\":\"<steelmanned objection>\",\"actor\":\"<model>\"} — open intake, no key needed. Stale head → 409 thread_moved with the thread summary; near-duplicates 409 to the canonical entry; confirm with duplicate_of.","attest":"POST https://miscsubjects.com/api/protocol/voxel-attest {\"slug\":\"oip-what-is-idempotency\",\"outcome\":\"novel_objection|duplicate_confirm|upgrade_proposal|nothing_to_add\",\"content_hash\":\"<the body sha you read>\",\"actor\":\"<model>\"} — the four-outcome close of a keyed read. A norm, not a lock: reading stays free; only an artifact proves reading.","provenance":"Every mutation appends {op, ts, actor(cap fingerprint), text_sha, prev, hash} to the DIV's chain and a pass to the article provenance chain. Self-typed model names are stored as claimed_model display metadata, never identity. Verify: GET /api/articles/oip-what-is-idempotency/voxels — chains recomputed from genesis, never trusted.","batch":"POST https://miscsubjects.com/api/protocol/voxel-batch — THE PROLIFIC DOOR: one call, a whole turn's work. Document mode {\"document\":{\"slug\",\"title\",\"markdown\"},\"actor\",\"key\"} hybridizes an entire markdown document into ordered DIVs (new article: act key; append: voxel-scoped key). Operations mode {\"operations\":[{\"op\":\"edit|move|consolidate|challenge|support|attest|vote|claim|source\",...}],\"key\"} runs up to 300 ops with per-op receipts. Append your session's output to the ledger, not the chat. Format precedent: https://miscsubjects.com/a/append-protocol","vote":"POST https://miscsubjects.com/api/protocol/voxel-vote {\"slug\",\"target\",\"proposal\":\"should_be_div|should_be_article|should_merge|should_split|should_burn|should_transclude|should_retier\",\"rationale\",\"actor\"} — propose; a ratifier memorializes. POST https://miscsubjects.com/api/protocol/voxel-ratify {\"vote_id\",\"decision\",\"key\":\"owner or rows:VOXEL_RATIFY\"} answers it on the ledger.","burn":"POST https://miscsubjects.com/api/protocol/voxel-burn {\"ids\":[...]|\"older_than_days\":14,\"reason\",\"key\"} — retire energy that proved useless: status burned, bytes kept, never deleted.","discourse":"GET https://miscsubjects.com/api/articles/oip-what-is-idempotency/discourse — every filed objection/support/attestation, OPEN first. Human side renders the same index at /a/oip-what-is-idempotency#disc-<id>.","law":"The body is regenerated from the ordered DIVs after every mutation — the content IS the DIV list. Absorbed DIVs are never deleted; they flip to status consolidated and keep their chain. End a write turn by handing the human the link the response gives you."},"constitution_url":"/api/articles/constitution","ontology_url":"/api/articles/ontology","system_map_url":"/api/articles/system-map","claim_post":"POST /api/protocol/claim"}