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 0xf43ae97886e971da750dc3cc3331206b25f244ba7f89992dd899c3f329c367f9. Chain 2 (Bitcoin): anchored in block 953996 (2026-06-16T20:04:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2fa8e0d9-c804-4ed9-baa9-bc8ffc2ee384.json and https://artists.proofprofile.net/proofs/artist/2fa8e0d9-c804-4ed9-baa9-bc8ffc2ee384.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 0x6cea754cd5e16471da41673463478508d493e31f62329bd7114f73ef66d03b0a. 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/ES7311600088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b66b4047913184ffaa1ab3a472fa03b721d2459ef1cdcb90a4c045857ecf6d8. 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/ES7311600089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7c7f9845ae33c701a3f0b18e0eda78bddd1cb5eb945b7f07a571ce4a72e893. 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/ES7311600090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f01d8a86eac5bec1d71c47c744e60b40918ff658d873c59a773e4fd9c15e338. 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/ES7311600091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x176660f008ad92ae302c53a73159f51653de5d2656d9b6761c0633d8a6ebb209. 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/ES7311600092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x871c3daf5a0e6e4a1a1a84df88614e73d82f9af1af043cbd7feccd18969e20e8. 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/ES7311600093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e710b886c03aeb51218990fa3947cf58219c31651eadf4496fde4fc02bcb02f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES7311600094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83256dfb102cd11f4c30ea96821d9443065485f465e3002810d8bf4d7282a57a. 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/ES7311600095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9c042bf360b71ce84fbad0c7ceebdee908a68c2f0e487c405c9b5b0a45247e. 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/ES7311600096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d290bfddb730e3b7e05838edce9a7066351f02a98604f5e1ff43296aabdf158. 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/ES7311600097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ed49f2fd2b7ca3e9220a8dd5bdeec799e879b65a58c24c6fcc52ce9e13b7d5. 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/ES7311600098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812420dec4b4e72ba61e329031fff9a66a0acd1a80944b93c9a0e0f72224e156. 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/ES7311600099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2111812e1e8a99d3b6d555e1c42de0547cb7e4874ff2034a95653cf6f692527d. 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/ES7311600100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ac793926defc1b3342d5b57f8efb07524d11a5f9fd74f94b95ccd3242a5630. 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/ES7311600101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce8042319b6fd8214a0efae570b106b751b67a8a938ef28d2ea3cff53891af7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ES7311600102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c9c9d2c5f281dd753591d0f016a5f9878d38cfbdb2b22fe5c0b8afd00d3fe3. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:03:18Z), 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/USCGJ1831540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f466413681f304ee0ace7a14b931060c385fe3ebeee9c5c5f89e2ab3c7d0bb. 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/USHM81790311.