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 0x2c0886892cbbc3e702fd779468563530a6ea73090d4f741c98ba66f4f89e537b. 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/5f351e58-4052-4bfc-b007-3eff38910da4.json and https://artists.proofprofile.net/proofs/artist/5f351e58-4052-4bfc-b007-3eff38910da4.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 0x594753a9e589686a36cabde50a1ffeee38dc9911fbbcf87431b3e3b71d968c3e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CZA168800482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a3a62186ad5ec168707e11233c6e006b1fe04344548697a44604c292fde48c7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CZA168600067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68a991e18032209daa3329b4f89f160e648057a09c200638d46ed6a87cdb3b9d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CZA168600031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb847da93a8c37a1d19c51a6680ba505b532c52e09c58bf1f06089051980b1567. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CZA168600069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eac51cc9948eb538d41c98b1b3f6d73ecb4212eef5655a8f219bdadfd23468e. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CZA168600068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9061ae69e8de6aa2aa9d9771700aa14c799b633aaff2b3a2e9984efa0cfb0c9c. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CZA168600070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaef7789ce93944a110bfa53e9447ef9a9c0dc9af8a982ae0053666d971cee5ab. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CZA168600032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312282bb66b5dc52e4bb422b49c5e7176922ccf8001eb55f1963694859b2fd80. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/CZA168600071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd549a6873f66829395511c6595988c0c6206184eb2c3b069e94b811455d027. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CZA168600033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf465ef889919dfc069d4998c0ad70649376bfec7d97a05a38f1806064bb5ee8. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CZA168600072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7df9e042ffc361583ae029db9369f5ee57de63fa8e03c7011be1205a8ea0cf64. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/CZA168600034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad8288814a1b7a9710007c520bc11b79bf738f2780d2b4f85ea8a00ad1c9c744. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/CZA168600035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf825233b2ae9c9fade4f82f74ecb624b956f93130383143a8e87dd0ff3ca44a1. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CZA168600073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bcf3a72ec71e140e77adf8824c21533b5268a4fa5b8681c0db74db6cea0d6d1. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/CZA168800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1cb6b0a5544616c330c5fc654ba3bffe9920262fddefc01229a199f3f57b46b. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CZA168800026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe776faa55d97fb52b5ff8cc121059d3d1ebb4e42d6c98f75d3c6d6d0e64af720. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/CZA168800027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe659175d35d634916a6c37b04c769e4816574d3b97e0a9bf57efb402c51f62c7. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CZA168500487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64e54262ec8104138d56ce098c64951eaf98424580837758cb07b6e824421a92. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CZA168400542.
Supraphon hraje ...Kam se lásky podějí? a další z 80. let, Vol. 12
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x414a384eb443f19dff2a31068d9b4f63e85f8b8705066f3cda96244685a8e015. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/CZA160606701.
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