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 0x90cff2d09d400bb41b20aa72d206d3a62452873f9d5fff0ec1df8b3fa1732905. 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/481466bf-1886-4744-bf6e-9a34bd27e90c.json and https://artists.proofprofile.net/proofs/artist/481466bf-1886-4744-bf6e-9a34bd27e90c.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 0x16ad84ea09526b99bfba578ac49705a9d999a0227d6f19e6eec84f169b31804f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NLP760800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188d9f59ee80c8ace2525f8391e4eaa4fc0b8ce87f1ccb177018d933a8bca9f8. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/NLP760800065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188d9f59ee80c8ace2525f8391e4eaa4fc0b8ce87f1ccb177018d933a8bca9f8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NLP760800065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1d2e00ceee52b9c4d3a8c3f02275cefe42a0eaf5604639271eaed1e4f74e819. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/NLP760800075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d17f7b2bbac6b52ca4a70853ac20a15145fcafb4417ee47a5038721125545f7. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:44:02Z), 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/SEYOK1318220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c3013f0b26d8596132aecafb2640c0ed6974f6f0a13ceee706140364a1492f6. 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/USCM50600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x224f77d820bc1a866e8fdea54adf25c52937b78e4a296af1b2edca803ddb9ea9. 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/USCM50600020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd948b956778c3328dae7f9156f2ef08832381617d1a54925a627e13ea6f279d8. 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/USCM50500174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710eb87e9add1938ed2683fc53b50e374efe3ab3b1907bc08d01abbe81ada45b. 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/USCM50500182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac2622a4f34e340a6833a4162c9d74806e83ad2cdbddb4b84770791d494641d. 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/GBKQU1828767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf125788a4dff24ff842af1cd8b801846107eddcd534a301759dfb633cd4755a. 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/GBKQU1824887.
Het Beste van de Beste Zangers van Nederland (Deel 2)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0fd5971456acb78d54c0e49c92a0c93d63c2d0fe27f775fec22f2544e776c6. 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/NLSU31100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18b86d9c802d0afa1706c33eddf8483e4999acbf9f496f34fe7ba8ac588f706. 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/DEAR41755669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x063d6e3f9d03b7bc96704535f95c644fd03ccb71d82adc920675c830d41d5f49. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/QM8RJ1400062.
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