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 0x1f0451e1c8edcf4814c32d5654baaf234ec82f852ae69ae74a6032a72807487e. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b20e519-7bc2-4e42-ad20-8661d7d28db8.json and https://artists.proofprofile.net/proofs/artist/5b20e519-7bc2-4e42-ad20-8661d7d28db8.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 0x45e2ff758d1f940c4005b82cf2ddd17bd08c9d23eb3a6ec1a7083216a35d5d49. 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/NLCQ61640701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaab2e45cbc6da451e7e1a2ceeb661f8ea14b50dd0050e1c8179023bd5fc99310. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/NLCQ61640703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe4b26e9bfa66e35e362c8fdc9683e8d70ed98c20f9a0b0b734b99b5cb796a6. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLCQ61640704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88f23e5e193ead95e01943bc42cc214d8e7c4d3e5bfa7608fe4c9330310b7c95. 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/NLCQ61640709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92f55f74f68c9f1ae243d42dee3a17f7d95ce7bf796a0992981f162a3e971255. 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/NLCQ61641301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e19ea9a18c9396efdc735bc6566347a54a6bcc93e8b392f366355d3ed1ae85d. 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/NLCQ61641302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2546093c1b8cd3783452f2b622eaf84c07f7fa9a1608117c1decb435460aec6. 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/NLCQ61641303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02e6de6bb5504c0eb2bb2810074eb2e97c5eea5885b945e94c6218811f5f494. 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/NLCQ61641304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4bfcece4ec33c4711a67b902ed7389512a211ba3ad60e3ff01c5b99709aa4cd. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/NLCQ61641305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72ae748c7419adbbe8c104e1a155b2538c3d4580531fbee82dd9aa278eaa50f2. 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/NLCQ61641306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26041c2cd850cb62b24a91976e77116ed42717017a9e638e9a22a624a2edd3b6. 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/NLCQ61641307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26959b20e602d50f08de81608418213d227b21145d655f8d08e76d41efb1bd50. 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/NLCQ61641308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e1e2b22febf4a6e5b816bb68fc9b55348b440924fcf930ef955ffdac0bd799f. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/NLCQ61641309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dcd37581d8de0e713f59e290a06d6e85f8055767f2871d672b1001a0cb40875. 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/NLCQ61641310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadd59bec4b151cf7b29380cdd58220ba20ae231c7048e6a0790f491ade9ed0f2. 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/NLCQ61641311.
Lof zij de Heer' - Instrumentaal intermezzo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68954012fdaafeaab91d063248023749cda594a6379ec4dc17c5b8895ebefa0. 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/NLCQ61641312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e072ad5ab0cfb14e51b97781ceef17761e541d9604b2bea21cad66a753ec23. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:27:10Z), 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/NLCQ61640712.
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 0x7fee550b29e40e8077973eb702882c0fe846fe0d28fcd959b9e091ac85e82bae. Chain 2 (Bitcoin): anchored in block 960179 (2026-07-30T00:39:11Z), 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/NLCQ61640707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x103a8ccae0833875e6a5d95c14c53ff2f26898b2e9a58c9a49721ec9fa424517. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLCQ61640711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92286108c0dd82d4dfeecddf1e75771a4ef6e22ac254cc3529178d8df9b2b454. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/NLCQ61640714.