{"cip_id":"0089","title":"Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","status":"Final","counts":{"sibling_cips":1,"forum_posts":1,"forum_topics":0,"mailing_messages":22,"mailing_threads":3,"github_items":3,"blog_posts":2,"youtube_videos":0,"total":29},"sibling_cips":[{"id":"0117","cip_number":117,"title":"Logical Synchronizers","status":"Approved","reason":"mentioned-in-content"}],"forum_posts":[{"id":24009,"topic_id":8287,"topic_title":"Canton Network MainNet v0.5.1 Major Upgrade Announcement And Advice","post_number":2,"username":"bernhard","created_at":"2025-11-20T14:18:00.747Z","snippet":"… nd 6 hours This major upgrade with downtime was approved by a vote of the Super Validators to adopt CIP-0089 Validators will stop processing transactions as soon as MainNet begins this pause. To rejoin the ne …","topic_url":"https://forum.canton.network/t/canton-network-mainnet-v0-5-1-major-upgrade-announcement-and-advice/8287"}],"forum_topics":[],"mailing_messages":[{"id":"728","thread_id":"119186980","thread_title":"CIP-0117 Logical Synchronizers and LSUs","group_slug":"cip-discuss","author":"Wayne Collier","sent_at":"2026-05-06T20:51:00.000Z","url":"https://lists.sync.global/g/cip-discuss/message/728","subject":"CIP-0117: Logical Synchronizers - Wayne Collier, Moritz Kiefer, Rafael Guglielmetti","snippet":"… grades (LSUs) will replace the \"Synchronizer Upgrades with Downtime\" procedure used in CIP-0062 and CIP-0089. A successor physical synchronizer spins up alongside the existing one. Validators switch over auto …","cip_id_match":false},{"id":"557","thread_id":"117674538","thread_title":"CIP-TBD: Canton Ecosystem Status Page & Incident Transparency","group_slug":"cip-discuss","author":"Evan V. Temple Digital Group","sent_at":"2026-02-10T11:32:00.000Z","url":"https://lists.sync.global/g/cip-discuss/message/557","subject":"Abstract","snippet":"… rring to updates that required downtime such as https://github.com/canton-foundation/cips/blob/main/cip-0089/cip-0089.md","cip_id_match":false},{"id":"545","thread_id":"117674538","thread_title":"CIP-TBD: Canton Ecosystem Status Page & Incident Transparency","group_slug":"cip-discuss","author":"Evan V. Temple Digital Group","sent_at":"2026-02-06T16:54:00.000Z","url":"https://lists.sync.global/g/cip-discuss/message/545","subject":"Abstract","snippet":"… al Synchronizer — whether during planned upgrades (e.g., Major Upgrades with Downtime per CIP-0062, CIP-0089) or unplanned incidents — builders and validators must rely on fragmented communication across mail …","cip_id_match":false},{"id":"validator-announce-81","thread_id":"116680758","thread_title":"MAJOR UPGRADE WITH DOWNTIME ON MAINNET WEDNESDAY 10 DECEMBER","group_slug":"validator-announce","author":"Wayne Collier","sent_at":"2025-12-08T18:23:00.000Z","url":"https://lists.sync.global/g/validator-announce/message/81","subject":null,"snippet":"… nd 6 hours This major upgrade with downtime was approved by a vote of the Super Validators to adopt CIP-0089 The proven upgrade path is 0.4.23 -> 0.5.1. You must upgrade your Validator to 0.4.23 or 0.4.25 bef …","cip_id_match":false},{"id":"validator-announce-80","thread_id":"116620691","thread_title":"MAJOR UPGRADE WITH DOWNTIME ON MAINNET WEDNESDAY 10 DECEMBER 9 AM US EASTERN / 1400 UTC","group_slug":"validator-announce","author":"Wayne Collier","sent_at":"2025-12-04T22:03:00.000Z","url":"https://lists.sync.global/g/validator-announce/message/80","subject":null,"snippet":"… nd 6 hours This major upgrade with downtime was approved by a vote of the Super Validators to adopt CIP-0089 The proven upgrade path is 0.4.23 -> 0.5.1. You must upgrade your Validator to 0.4.23 or 0.4.25 bef …","cip_id_match":false},{"id":"validator-announce-73","thread_id":"116391722","thread_title":"PREPARE FOR MAJOR UPGRADE ON MAINNET WEDNESDAY 10 DECEMBER","group_slug":"validator-announce","author":"Wayne Collier","sent_at":"2025-11-20T14:50:00.000Z","url":"https://lists.sync.global/g/validator-announce/message/73","subject":null,"snippet":"… nd 6 hours This major upgrade with downtime was approved by a vote of the Super Validators to adopt CIP-0089 Validators will stop processing transactions as soon as MainNet begins this pause. To rejoin the ne …","cip_id_match":false},{"id":"tokenomics-announce-260","thread_id":"116383311","thread_title":"PREPARING FOR THE MAJOR UPGRADE ON MAINNET DECEMBER 10TH","group_slug":"tokenomics-announce","author":"Wayne Collier","sent_at":"2025-11-19T23:16:00.000Z","url":"https://lists.sync.global/g/tokenomics-announce/message/260","subject":null,"snippet":"… nd 6 hours This major upgrade with downtime was approved by a vote of the Super Validators to adopt CIP-0089 Validators will stop processing transactions as soon as MainNet begins this pause. To rejoin the ne …","cip_id_match":false},{"id":"402","thread_id":"115880674","thread_title":"CIP-0089 Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-discuss","author":"Wayne Collier","sent_at":"2025-11-05T02:21:00.000Z","url":"https://lists.sync.global/g/cip-discuss/message/402","subject":"CIP-TBD","snippet":"To clarify, this change does not require a new CIP governance vote; the message above refers to an implementation change that requires a new onchain vote by the SV node operators.","cip_id_match":true},{"id":"400","thread_id":"115880674","thread_title":"CIP-0089 Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-discuss","author":"Curtis Hrischuk","sent_at":"2025-11-04T21:19:00.000Z","url":"https://lists.sync.global/g/cip-discuss/message/400","subject":"CIP-TBD","snippet":"Hello, CIP-0089 was just updated to incorporate daylight savings change which moved times in UTC ahead an hour. It  …","cip_id_match":true},{"id":"supervalidator-announce-216","thread_id":"116048461","thread_title":"Vote for Devnet synchronizer migration to Splice 5.0.0","group_slug":"supervalidator-announce","author":"Kamil Golebiowski","sent_at":"2025-10-31T14:06:00.000Z","url":"https://lists.sync.global/g/supervalidator-announce/message/216","subject":null,"snippet":"… c7dd8ed149dca1112209a21a170cf86d74e5766949d6a7043ba99e4030fb9e34233c64bbc8cb146d345 as described in CIP-0089 https://github.com/global-synchronizer-foundation/cips/blob/main/cip-0089/cip-0089.md Expiration is …","cip_id_match":false},{"id":"cip-announce-60","thread_id":"116029238","thread_title":"CIP-0089: Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-announce","author":"DrAmandaLMartin","sent_at":"2025-10-30T13:08:00.000Z","url":"https://lists.sync.global/g/cip-announce/message/60","subject":null,"snippet":"Hello, Canton Improvement Proposal CIP-0089: Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4 has been approved by vote of the …","cip_id_match":true},{"id":"cip-vote-474","thread_id":"115995020","thread_title":"CIP-0089: Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-vote","author":"Aman Goyal","sent_at":"2025-10-30T12:26:00.000Z","url":"https://lists.sync.global/g/cip-vote/message/474","subject":null,"snippet":"SBI votes in favor. toggle quoted message Show quoted text","cip_id_match":true},{"id":"cip-vote-473","thread_id":"115995020","thread_title":"CIP-0089: Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-vote","author":"Veronica Augustsson","sent_at":"2025-10-30T08:49:00.000Z","url":"https://lists.sync.global/g/cip-vote/message/473","subject":null,"snippet":"7RIDGE/C7 votes in favour Veronica V E R O N I C A A U G U S T S S O N / P A R T N E R ​​​​ ​ 7RIDGE IS A PRIVATE MARKETS ASSET MANAGER INVESTED IN TRANSFORMATIVE TECHNOLOGY FOR FINANCIAL SERVICES TO ","cip_id_match":true},{"id":"cip-vote-472","thread_id":"115995020","thread_title":"CIP-0089: Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-vote","author":"Chris Matturri","sent_at":"2025-10-28T19:00:00.000Z","url":"https://lists.sync.global/g/cip-vote/message/472","subject":null,"snippet":"Proof Group votes in favor Chris Matturri ​​​​ chris@... ProofGroup.xyz toggle quoted message Show quoted text","cip_id_match":true},{"id":"cip-vote-471","thread_id":"115995020","thread_title":"CIP-0089: Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-vote","author":"Justin Peterson","sent_at":"2025-10-28T18:58:00.000Z","url":"https://lists.sync.global/g/cip-vote/message/471","subject":null,"snippet":"Tradeweb votes in favor toggle quoted message Show quoted text","cip_id_match":true},{"id":"cip-vote-470","thread_id":"115995020","thread_title":"CIP-0089: Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-vote","author":"Yiannis Varelas","sent_at":"2025-10-28T18:45:00.000Z","url":"https://lists.sync.global/g/cip-vote/message/470","subject":null,"snippet":"Five North in favor. toggle quoted message Show quoted text","cip_id_match":true},{"id":"cip-vote-469","thread_id":"115995020","thread_title":"CIP-0089: Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-vote","author":"Luca Toscani","sent_at":"2025-10-28T18:44:00.000Z","url":"https://lists.sync.global/g/cip-vote/message/469","subject":null,"snippet":"… s.sync.global Date: Tuesday, October 28, 2025 at 10:05 AM To: cip-vote@... Subject: Re: [cip-votes] CIP-0089: Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4 Liberty City Ventures votes in f …","cip_id_match":true},{"id":"cip-vote-468","thread_id":"115995020","thread_title":"CIP-0089: Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-vote","author":"James Lang","sent_at":"2025-10-28T17:04:00.000Z","url":"https://lists.sync.global/g/cip-vote/message/468","subject":null,"snippet":"Liberty City Ventures votes in favor. toggle quoted message Show quoted text","cip_id_match":true},{"id":"cip-vote-467","thread_id":"115995020","thread_title":"CIP-0089: Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-vote","author":"Kinga Bosse","sent_at":"2025-10-28T15:03:00.000Z","url":"https://lists.sync.global/g/cip-vote/message/467","subject":null,"snippet":"… lists.sync.global Date: Tuesday, October 28, 2025 at 10:55 AM To: cip-vote@... Subject: [cip-votes] CIP-0089: Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4 Hello Super Validator Node Owner …","cip_id_match":true},{"id":"cip-vote-466","thread_id":"115995020","thread_title":"CIP-0089: Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-vote","author":"DrAmandaLMartin","sent_at":"2025-10-28T14:55:00.000Z","url":"https://lists.sync.global/g/cip-vote/message/466","subject":null,"snippet":"Hello Super Validator Node Owners, Please find ready for vote: CIP-0089 Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4 Digital Asset - SV Sponsor Cumber …","cip_id_match":true},{"id":"389","thread_id":"115880674","thread_title":"CIP-0089 Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-discuss","author":"Chris Zuehlke","sent_at":"2025-10-27T21:15:00.000Z","url":"https://lists.sync.global/g/cip-discuss/message/389","subject":"CIP-TBD","snippet":"Cumberland is willing to endorsing this CIP. Chris toggle quoted message Show quoted text","cip_id_match":true},{"id":"380","thread_id":"115880674","thread_title":"CIP-0089 Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-discuss","author":"Curtis Hrischuk","sent_at":"2025-10-21T20:20:00.000Z","url":"https://lists.sync.global/g/cip-discuss/message/380","subject":"CIP-TBD","snippet":"Hello, Please find below the full text of our proposal, “Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4\" which is open for discussion. Digital Asset is backing this proposal as spon","cip_id_match":true}],"mailing_threads":[{"id":"115880674","title":"CIP-0089 Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-discuss","message_count":4,"last_post_at":"2025-11-05T02:21:00.000Z","url":"https://lists.sync.global/g/cip-discuss/topic/cip_0089_synchronizer/115880674"},{"id":"116029238","title":"CIP-0089: Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-announce","message_count":1,"last_post_at":"2025-10-30T13:08:00.000Z","url":"https://lists.sync.global/g/cip-announce/topic/cip_0089_synchronizer/116029238"},{"id":"115995020","title":"CIP-0089: Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4","group_slug":"cip-vote","message_count":9,"last_post_at":"2025-10-30T12:26:00.000Z","url":"https://lists.sync.global/g/cip-vote/topic/cip_0089_synchronizer/115995020"}],"github_items":[{"id":"canton-foundation/canton-dev-fund#294","type":"pr","repo":"canton-foundation/canton-dev-fund","number":294,"title":"Development Fund Proposal: Hard Domain Migration Platform","state":"closed","author":"ericmann","created_at":"2026-05-02T01:14:59Z","url":"https://github.com/canton-foundation/canton-dev-fund/pull/294","snippet":"… for Reviewers This proposal is intentionally operational and upstream-collaborative: it complements CIP-0089 and LSU work rather than redefining protocol versioning or becoming a general-purpose validator ops …"},{"id":"canton-foundation/canton-dev-fund#55","type":"pr","repo":"canton-foundation/canton-dev-fund","number":55,"title":"Proposal: Continuous Security Partnership for Canton Core Infrastructure and Ecosystem x Vulsight","state":"open","author":"salmaansaeed94","created_at":"2026-03-06T10:24:00Z","url":"https://github.com/canton-foundation/canton-dev-fund/pull/55","snippet":"… ce hours sessions, and incident response support. Canton is evolving continuously. New updates like CIP-0089, CIP-0092, and CIP-0094 each introduce new paths, features, and risks, which means the attack surfa …"},{"id":"canton-foundation/cips#126","type":"pr","repo":"canton-foundation/cips","number":126,"title":"Create cip-0089.md","state":"closed","author":"hrischuk-da","created_at":"2025-10-28T14:19:37Z","url":"https://github.com/canton-foundation/cips/pull/126","snippet":"Create \"CIP-0089 Synchronizer Migration with Downtime to Splice 0.5.0 / Canton 3.4\""}],"blog_posts":[{"id":"canton-upgrades-amid-accelerating-demand","title":"Canton Upgrades Amid Accelerating Demand","excerpt":"Canton Network delivers major upgrade, boosting performance, scalability, and DevEx amid accelerating demand. Learn more about Canton Network’s upgrade here.","published_at":"2025-12-15T17:27:16.000Z","url":"https://www.canton.network/blog/canton-upgrades-amid-accelerating-demand","tags":"blog,blockchain technology","source_label":"blog"},{"id":"da-release-canton-3.4-release-notes-for-splice-0.5.0","title":"Canton 3.4 Release Notes for Splice 0.5.0","excerpt":"Splice 0.5.0 includes Canton 3.4.  This is the release note documentation for Canton 3.4.","published_at":"2025-11-11T00:00:00.000Z","url":"https://blog.digitalasset.com/developers/release-notes/canton-3.4-release-notes-for-splice-0.5.0","tags":"da-release-notes","source_label":"blog"}],"youtube_videos":[],"derivedAt":"2026-07-21T22:59:54.489Z","source":"derived from cips + forum_posts + mailing_messages + github_items + blog_posts + youtube_videos","canonical":"https://ccpedia.xyz/cips/0089/citations"}