__NOTOC__ Marci may refer to: 3791 Marci, a main belt asteroid named after Jan Marek Marci Marci (crater), a lunar crater named after Jan Marek Marci Marci Beaucoup, a studio album by American hip
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098066dc5e797e1b5717ca7c1caa73b5819d9646d78594d0b35f66fc63a46d77. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b2dd957b-1309-400a-b0be-70a95fdf9035.json and https://artists.proofprofile.net/proofs/artist/b2dd957b-1309-400a-b0be-70a95fdf9035.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2cb4cc453b0213f2aa33420edb3d09eaefb77058f7ec33c58be36b5404089a. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA21O2110203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfc468f39b843924bf14df79715d78d0036acd42d2b08ea698b49edfc47787db. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA21O2110201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e0fb712c606559c56f7d9575650cc14534b7e498578e5b5286150bf0a94df7. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA21O2110205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae50e416dbad176074b6fb5dc66b36d16e3a7c6fa9c702e25939474fa6ca9d5b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA21O2110206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x906a19d576cf1a9e3c7e893c988d76db6b32c7ec83a846396bed35e1736ba67c. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:06:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA21O2110207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9337968f59a867cc51889e8988d577df85fc3256ac2a43eed49735655b566a8a. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T09:03:21Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA21O2110208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d1c3ae938c2b05e11e3c423987a6400835c7d5820267dc73be19497d85d3ed. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA21O2110211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf642039ef5e8b530be3b303424beb740ce26732adb7b452f3b793f5962037c15. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CA21O2311103.