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 0xbae4dba706d761edecd560abd134c36098050df98ee1576af2100f1356ef8ad7. 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/12709329-04c8-4894-848a-de9e14501ff5.json and https://artists.proofprofile.net/proofs/artist/12709329-04c8-4894-848a-de9e14501ff5.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 0x676769acfd8fcb3dd64a155fe15b5316d2a6a0766cf7cb6dd712b1cb77c716b5. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZFZ62104436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881611fcaf17d164a752c015712bec14b8fedbcee9e04af837fec52c21c1e90d. Chain 2 (Bitcoin): anchored in block 958721 (2026-07-19T11:02:33Z), 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/QZHNC2461253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb09618307d6bcd222d6b337f104fdd39dffb13f849fa4d09902ee5b42458d94. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZFZ22575908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551869bfe230ef8590099265157fcd44f83939b759793fe6bd67975c5f04bce2. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZHN32505237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef8d47a87e47a07cc6b7322476312652c09acece8d9e11bf0f47676b9bac879. Chain 2 (Bitcoin): anchored in block 958670 (2026-07-19T05:26:23Z), 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/QZHN32505238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16398b4db10551f2c6d5847dcf9c25aa1eb4ae63cbd44146766b89f518cbe926. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZHN32505239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b82e48fea72eeeaeb17efa85bcc1e347574f8efa9f3947c38d9831a5a92fd1b. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZHN32505240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec171c3608b2889463451fa3dd9e7d40802468c0f979aabf89b133a0fe82b18d. Chain 2 (Bitcoin): anchored in block 958218 (2026-07-16T00:33:33Z), 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/QZHN32505241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6beaef972404ef64e6dce57495510cb79daf97e74c0b4216074ca876fdf3e986. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/QZHN32505242.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6662b712bc4583570c9c09979af29bc5ab42590a73dea319dc9669d137d4f373. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZHN32505243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a4f47d232e72636e0784e827a5878a2280acafa3b020e210e4a0aead1cf1cc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN32505244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cf24efcc624ff526457e41cf124e770a1f7468b18a8eaa981964fd598154aad. 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/QZHN32505245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c884e0bd3dd66e427c1a5237e1b94810ccd19a9e172b1833ab2f27987811ae. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZHN32505246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7afbfb8afb6f6055793226b5ba83be0a33fc99a5dc0e5400d8cbda6a5cd0f5. Chain 2 (Bitcoin): anchored in block 957772 (2026-07-12T23:31:17Z), 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/QZNWR2524571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c5db32935662e2d9f514be2458a0aa12ef61ebabd29d8646c2556736f9124e5. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZTB52540267.