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 0x1d9580b4a344f41ef609849fc1786515fe78ce2616b70c865cec3ba0b554edd9. 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/d53f0a14-c310-4f77-9f62-740c2c25f16a.json and https://artists.proofprofile.net/proofs/artist/d53f0a14-c310-4f77-9f62-740c2c25f16a.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 0x596ceddf99a4405a0f3cee75950e02b06a665d3004086c9106c120c272b7d6cb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLD681302021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41128312259b321cae09c0328a8e61f64818cfa565e9d7fba94e1b4848aa5be7. 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/NLD681302030.
Als g' in nood gezeten (Bekende koren van Martin Mans en Wim Magré zingen de mooiste liederen van Johannes de Heer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a4fcb67c034ac2cf9726a3a462fb7fe63a28072c30a535aa25d52c8c347c803. 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/NLL6R1600142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0d559d1d5b91ee841ad9d38f48644771129dad44a642cbb5848b30ffa03414. 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/NLL6R1600143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf27e09d0e1259ab99001fca54e562cbc13c335a7d1c924458f34b559d3a6654. 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/NLL6R1600144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5aef328eace3b1c9cf5e1ce8ca24e9384a4c4bb49470ee0d935ab67e6f7e363. 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/NLL6R1600145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x535f02ec0cbd75eb4f8c0165e56dc4f7b723d646cca388b1c1a8878e69e2a871. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/NLL6R1600148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe167516bd06d2d2afe456f34fc4083a65a3e7480f9569b32e4f96215931897cc. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLL6R1600149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545ff844e53e6c81a1f4b52c03fbc22e0332379651ba1e2f1e34bd4e1975fda0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLL6R1600150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d3b6ca1360ec6deeaefbb524254ddf9ca65e05cf485dfbf47187eac56e635c9. 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/NLL6R1600151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6e2e353c9c13418efa5dae86b914389ecc6a269e23475966cf2cb7b1593dbb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLL6R1600152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7dd53f7b21bda2c73dac5cdbeae3405c271348b6a2c2b133e08419d43750863. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/NLL6R1600154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe73a904586f602d272127c8c5f763a36b96cb5a6bbf977bd15d1d9614dc69c7c. 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/NLL6R1600155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c12a947e1c0f04ffef45493248356469636f65c975dba5b255aa714c3767c21. 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/NLL6R1600157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee261a61d0550f9ba948f571cc5de85e4f67fef1b73525cec9d265a132bbea14. 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/NLL6R1600158.