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 0x2d9469c78632019f84a3bb65a69adaa3b3cc9cdeb064c262cff63408060f3341. 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/82453306-bda7-4909-883e-72fa41c6957d.json and https://artists.proofprofile.net/proofs/artist/82453306-bda7-4909-883e-72fa41c6957d.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 0x33a922247b47e82c299182e03c778f21f3521c5450c1b05f024a9367157ea828. 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/GBAHT2100807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x575fe61681609654eed5d5e5dd8d287d009fa50950b5524725b08c71a086ab92. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/QZN882214198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76e85244a6c3cf8b6403125cbdf628e76e0a7fcffaf68fba765f244bb407ad99. 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/US3DF2258820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06923e529fed593ffa8a22dd9c406cf5beb03ec9d1d60f9bed3e39bf4330071d. 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/GX89G2206858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed54e09213edc9fb2ed597a6e1653a4de7ba5266961325df5c3103acdad36896. 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/USANG2228870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbbd7cdf70cccf9011fec2928424ccc8554b8c67f6d1d16e7f42689846d6f4b9. Chain 2 (Bitcoin): anchored in block 958075 (2026-07-14T22:55:31Z), 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/UKZGC2204143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf632687a9a3f409143ab331c348db4854e19641f80ec3da8d927fac0a2528ba8. 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/USANG2278119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d217c39057885cf61632281e4daa0722fda0b349477ca20d6f95b31ac0a5ab. 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/USANG2278122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda2d8e99451611ddced1d48dcdc3c703b48c008a05c4e30ae58b2bbf53f9cc3d. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/USANG2278125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1153508ca5559e1f2e23f688b08a8de9847167b20cfd5432cdffe4c38976c891. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/USANG2271098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8f0e14e3c85932f85c05f5f5c691199b728831dfa559e0d1ae032f1cb3c57f5. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/UKZGC2302449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x987f477f0e74ff12cbc0845e60d8a2adee97d535501449f08f27c4e4104fa53f. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QM3DF2224378.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e86f1db196e7357e92109ea4ec3dc4991b3a8fd4613801d704cba97f4dfe0e9. 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/QZN882184855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe99d1ef50d2375c0db97b0da7acd84170f9e8393ec47b43e8a598e8142ef682c. 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/UKZGC2203944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec6defce335eb80208a49e84cca418bb6ebb968e03d8c50bb90f374fb7ff286. 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/USANG2276989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9408cd71f5812a890f5db40ac99734ba5b52b845418608ae41817fdd646f6de9. 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/QMANG2228936.