right|thumb|upright|Late medieval shirt with gussets in the seams at shoulder, underarm, and hem. From a copy of the Tacuinum Sanitatis, 14th century. In sewing, a gusset is a triangular or rhomboida
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d85b564848509a21c2e9438fee1af3cc8fbc9f8e44fd62823889b35c3754b4. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b559d46-229c-4e63-bc61-d5e6201eba83.json and https://artists.proofprofile.net/proofs/artist/5b559d46-229c-4e63-bc61-d5e6201eba83.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd01452d7fedd5213539ea76467ca0095d450cf7ea174a9f29a9b6d61c521819f. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZES82415038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x278065091b5a6c9b5dfb69cf3bd795e3bbed65efba6c74d57dabc45205b6977e. 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/QZTAW2393870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d23576d28f9ff325149a82efefe8230ddd61cf131fe05d7f86948ffcd2bba7b. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T07:40:51Z), 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/QZWFF2393245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ae9b144a837908f15fb32014483413f2c9a838ef68dedb0035bac1cd63214a. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZES82415041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230add99eaadc11c8cd0c58714218958549f68975d9181a4ba766f90978f60a2. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T18:53:06Z), 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/ES84D2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d7b1748001236a12bb3ecfe3c6148bcbe51fcff3c59664be33b2bc55ba4e79. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/ES84D2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c48158e9509bc369d5fda40d67afd71a930a468d345fb50dc1a2ce8a4a3482c. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/ES84D2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe86cad82c93a6dbba58f0058586c5d452b8f843fa0a5c0c419d9e035f17782b4. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T19:54:07Z), 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/ES84D2400060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x666824edd2f1442c53626027e8ceaa14246acf0fabf9d5679c7f436cea696bb8. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ES84D2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30d0258932150f4a1716bfa11684286971ae3cb5fd6ecfee968669baeb967f27. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/ES84D2500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb45ba36ca3dc6e8d669586fd85f6edb3b9996eadfdc234897adcc1d06d95d9. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/ES84D2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230add99eaadc11c8cd0c58714218958549f68975d9181a4ba766f90978f60a2. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/ES84D2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d3b5eb12c798208d2ab3492fb661ae24eee2c08b372847812960bc0992a084. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/ES84D2500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27caef1ad15c72d85f4758b336b0527ca4d5e11921da37a680a6743bd3946479. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T07:07:28Z), 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/ES84D2500044.