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 0xc0b1b34cee3fa39e44c66d8160e9f7daa30c900a09a2e0e6ac41f6a109dbaa63. 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/0b1a7752-2d11-4fd1-a668-3f7b9b8f5b7b.json and https://artists.proofprofile.net/proofs/artist/0b1a7752-2d11-4fd1-a668-3f7b9b8f5b7b.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 0x8ba7272aeefed6bdde47182a57f9a949b483f9afdd7dcc97ff7662bbd2dd90f7. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/NLD017102045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbe538499064994978d792f4fa75d17c8466e95a3dc01893a065dcbcac54ebe5. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/NLD017102047.
The French Song (Quand Le Soleil Dit Bonjour Aux Montagnes)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9469e4c72bb4c61ac2677eb414ec80101021e55a7fa823bfd17f20438525816e. 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/NLD016402006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ea230260082dfeed4fccd8db27297bff4784c05e9001b82e8e0755fcaf8f4a5. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/NLD017102046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16746873101d7140c02f35f00466168639f4e920d273ae6edb2f44adffe81de6. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/NLD016502050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb07b7cb2a47ae7d9b9a77dc57aee23feca6fb3c8d8109f3b7ec8ea43402bbe. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NLD016502052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ad8909a5dbc18cd0d1a2f7ffcae45e667868a2707a877cab4f5ab729962c23. Chain 2 (Bitcoin): anchored in block 956777 (2026-07-05T11:01:08Z), 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/NLD016502053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136abf40980b895b74f1473c2f3d80a66647a876db23418c52361f2cd5039e17. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/NLD016502054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x663eb65f0b27f6dbd2abedc4d8b63a79797bdc267518a8f3ef148c11c28c08d0. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/NLD016402007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d68ee9ee26bba52978d77ddb962f412a1e21e2b8205a9cae65bce6062decda3. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/NLD016502057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6905de5f7174996d42cc21f7a0b4ede79968cb797fbf351e7b7839181a32eee4. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/NLA340919426.
De 28 Grootste Successen van de Gouden Trompetten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd2f5f58cddfb7a0cb366d3bae3fee6903beb218e82ce4c0e98f1084d0d6826. 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/NLD130021501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b358b7b83b705074bf77dc46dbc13b49d5e98b7f31c256abd5538804af67b1. 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/NLD130021505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ab5e6b0fa5eaf692197df22e981b603c603b01da76f83af6c844879846681eb. 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/NLD130021512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed990790f01ce8a38fa4e4eb5eaa509bbb31d579d4f8b302a010bd13c719760. 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/NLD130021469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x695ead58dfc28c96c069624b32adf62b6c900d6e3e50d4fcfbc461a72bf45b8e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NLD130021516.
Schrijf Me Nooit Geen Mooie Brieven Meer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ece07c0c5fe57cd1cf43b3358687668809cff121a81c1f227de0510e170ec42. 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/NLD130021521.