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 0x1b0f2119eebb8c30d75de74d8dba3f0e4d26b72ca21d2253e65f93a8b807c4d9. Chain 2 (Bitcoin): anchored in block 953654 (2026-06-14T16:26:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/47dc0c3d-a84d-4b0b-a331-bd38a9546956.json and https://artists.proofprofile.net/proofs/artist/47dc0c3d-a84d-4b0b-a331-bd38a9546956.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 0x684ca6ffb22f33b22cf112d0891fa2e8039ce038440ee10810c7eb61bacaa4f7. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/QZMWW2258460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd380c66adc8b884dd47ae2f39d5cb79f2e9212537890f5c3982e4e21ad5cbe82. 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/QZMWW2258462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b2c9f365e020ad52d09afc6910285eb3372675df5098ad28c592d7da7adc039. 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/USUYG1415226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c315795cf86f66842e723e55999e4cbd1ec40cf98cd107b79a26aae173635b. 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/QM24S2400929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e94fbaee4c53f84f09ea48f4118fc0d1ef278f5ca55c4f433c02591980e2e0. 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/QM24S2401653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab9e505d490756b1d8afad9e9f65503b9caad92b8896291ddda2babb7eb6d92. 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/QZHN82418514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f6753be92d9f49f8e42deb960165ee9506214773dae43cd4bc56a5416838ef. 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/QZHN82418519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c0255243a93f57186ac4d19ce2cdd9552bc53051e09e31dc0c157fece5fb694. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZNWT2398194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441fbd363627eb2e78335df0aeb7bf6387bd6b36a9b065616d33c2fbb25670a2. 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/QZFZ62318108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c993ee996a05eb4632b1a3ee68fe56ed7d07f1e72e5c4f15a55f5bdfe0041ef. 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/QZFZ62318112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc823048f0bc2350c55ea5b2113f53becf2a909d57252353b7cdb2e3c0f6bfc0a. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QZFZ62318117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63a6cf0f13251d3784a62ff2253bd4255174670e3d1e8e8eca741f71329bc4e1. 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/QZTAY2251367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3916a7b46380605d87c5b6ad60b59c61ef23fa84425c475caba8d4ea0bc583d0. 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/QZTAY2251369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d83a2044caefe218143ba4c6e049b2301af3dfc25175fed6cfed65076744b8. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QZHNB2261666.