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 0xaa67025d369656dc6b1d09d7f4c9dd39bb31b5b0058dcae3719ce5166251d9aa. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/626a826a-172f-4102-aed7-fbb89668ede4.json and https://artists.proofprofile.net/proofs/artist/626a826a-172f-4102-aed7-fbb89668ede4.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 0x34f51126eb4dd09402ea99d274ff17bbeb68954c492892d0d9988c2f0580865e. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZHN32553073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2722a99855ddccb47c7b29c8f9d4445b4f3404d726257da3f331663ab8bb4b1c. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZHN82516319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ad2b345e19171f35369c541fef3af818a113daa64d9a6228e02c3ca059af6c4. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZHN82513638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af4c16b1ceaa448ba11352ce4689315b9af29f46fe3cb45843916628c00b377. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZHN82513636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdd0035c74482bb9121f35b8647b950bcd738ffcffdf35af1dd61cc393984dca. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZHN82512534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc0d082e4b8e6244e375b06b5d69bb5e2658b5c036a1429455207ed9d3f4cce0. 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/QZHN82518273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07ee8cf92cb73826a70a0ba6781ff7a96b247ea9e2d4f548d2398a19591b1d4a. 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/QZHN82518265.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedff90adcbcaf5921d623b29d21a27e5088b16c3bad1cc88162f204eb92f7313. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/QZHN82518269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5819a879c4529b9e76f8fd1e9783fcde3cfe29bdade6f9bac22642eee2b4e8b7. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZHN82513637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb260ed6519966660daf279a2874dbcf421cfaa96e70c608be14c670c93cba455. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZHN82518275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119f945c49724ed5016c39770b8392524383df432cf8ff3e880c0960c6d33fd4. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/QZHN82518271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b62810a044b0c1883d2a7b86c4723038b2d6a069c2477de450239c425bfd845. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/QZHN82518267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878458b4ecc43fcff86f94b5beb8a4060c78ebcf3e767aab9bb4152cd1935a0d. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZHN82518266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7aa9ccfe347d882bfd3502bcff08585752ad2f7a576402d938034545ca4889c7. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZHN82518268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d22de8cfadbf957a5ad08512a019e5d807da31e7a087f4eb96d68fcde7aa4bd. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/QZHN82518270.