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 0xe5a85c5689b9986d6c5574e167c5e4f2580fe7e04b9ca4efc42277906424f3c8. 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/d69c8acb-3d0d-4d1d-8c50-ce85ad9fa46c.json and https://artists.proofprofile.net/proofs/artist/d69c8acb-3d0d-4d1d-8c50-ce85ad9fa46c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Johan Bredewout speelt eigen koraalbewerkingen
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 0x7bffaca470363ee17cd31f30dd006196ca62ed598fa889bc749179e7a5257083. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-22T00:40:43Z), 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/NLG620572962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd51dfb557f4d4a95ee9e22486b49a2b2f61e0ede780e3fd2fcb03346cd567745. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/NLG620572965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860a90d56d7a98296190af3c7ecc4d879701598a5f95c114038970674b234bfd. 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/NLG620572971.
Johan Bredewout Speelt eigen Koraalberwerkingen, deel 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1f57eca8764ffc29a964c756898d117e1ac4ec3ef96b00d6c24e61a821260d0. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/NLG620573915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8723faa9c6647b3a824060a02b5821c9d6038fc51382af1c7c0f8eb146caa6ce. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/NLG620573920.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c866578751dcd60a1657486f32c6b8060a860ed4db1f457d9031bbb40b485d. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/NLG620573922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfc5cf6cf13f8f6a4e91939c1fc60aa90fc4b36ecdcdb96d49354b27eaa81ae0. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T11:27:32Z), 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/NLG620573925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9311f3c1a4da8c6cc44c2eb38feb87b5cb55409dfb07f887a359e7ce90628438. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T01:42:46Z), 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/NLG620573926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa61818974c05bb457b6850b10943fa48acf7c78956087f4308342dbd438be6ed. 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/NLG620576703.
Breng Dank (Bekende Geestelijke Liederen Voor Orgel En Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a73d3371016278947d0bc1de483f831d840ebaaf9d1365c4764241ccc42f739. 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/NLL6R1800727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa283eb6622b1909fa6991d6091850101fda762503818b2b51c8149f1a9581dd. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/NLL6R1800728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c1808e1b1e9338aacab8da565f49aaa6f7f73860248fd5a5f5b406899532bd4. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T08:36:14Z), 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/NLL6R1800729.
Prijs De Heer Met Blijde Galmen (Psalm 146)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1acd2df36649ee9910958b1835e73e8083a31615cd38133dbd7c25793cb02878. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/NLL6R1800730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35e8566ad8bb69d76e920563b16a3afa66f62aa6284146c93debed914eed6e37. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/NLL6R1800732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b77ea1cb2ecababf6a5e11b42e3b743ddaa23d01e9a16bd4b8ad63e0467a03e. 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/NLL6R1800734.
Kom Tot De Vader - Je Hoeft Niet Bang Te Zijn - Heer, Uw Licht En Liefde Schijnen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda18cae188ef4863029ca070b10437c44528b8ea83bcdad6a49cba538a0e113b. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/NLL6R1800735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc460fb38ad1fbc94fb0ab24c7e0d1ed457267ea3ead27ff7971e9bf18fc71a5e. 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/NLL6R1800737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a87a2f27821ff65d18925fce2d77ed8c0b888761593cea5a9816b4f5dfee3fe. 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/NLL6R1700112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f1affbdc23d482e7258eb3d4effef76932a6cba539714c1a8fe40ef98d8427. 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/NLG620600564.
Christelijk Mannenkoor Soli Deo Gloria Urk
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d89f714c82a2916b2becb90b26125043243343e813faf19c4f562662cb44d5. 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/NLCQ61640702.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x859e9bb6c621760fa969c721a9f3c0df5a556faddbaf79998146768b1603bb83. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/NLCQ61640705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64ca2dd21662e299b0c013e7ea76dab642b1b9a9e935faf132f55ad32b5894d0. 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/NLCQ61640706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x841c4515a472a294dbfa9f3b1309af0fb163ceb2dcc7d0752cdb9464879a8a24. 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/NLCQ61640708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc00135d4978534882836991e177844b3afc3da177d09317bfdd5f757a55b45a. 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/NLCQ61640710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8293c350888b73d7302b5f57bf5942a8952611795422949aff35eeb352b2937e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLCQ61640715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b246a059bf676aef1bec21089d22bf600ec8c2a6df8868f530d3ae183a255c. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:01:37Z), 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/NLCQ61640713.
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 0x553fef0abb02b47f172375e6d9ac9d14544e700a2a600588081f92ac6d33f695. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLG620600565.