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 0x3b42bc7c3bcc706177ee2cb4cfe816d4b3f3fe03c5134576dc6d8ca734c3108b. 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/13b9e9d1-ef5b-4038-ae62-6abc533bf394.json and https://artists.proofprofile.net/proofs/artist/13b9e9d1-ef5b-4038-ae62-6abc533bf394.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 0x2098a7ade6f5e99e15b05411b0f3d1e207593c58277fef1400149471c4a09a0a. 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/CH7812061573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf49b70f17bc83bd8c73be672277909a747485ff365d3e7fa0679918c60889613. 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/CH7812232802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a8b09a556cfc90755b6e4a67b5ba8cfca0db5bbc9fa1ba47d6f3011418658b. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/CH7812347301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e2555990e4d5a25d165a6927fddd81dfeba610822fd0900fcebd665f4b37f81. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/CH7812362440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabab1298e9ea83d52acaa79a3764afd1e2d304f3b8b836e7e0fa1d41430a9f14. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CH7812364791.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1ecf62a001fd0a8a1ae7ff9bf2024516db3e89dca6bf7266b33bffbce56dcf. 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/CH7812400552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x765b6c983baec32aae26b2fbb94c1390d31c8bc4deb386779c94cefa9d04826f. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/CH7812400553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9bae89a691b7ef901b57125accfe1ab117eb8be8f67361b9c2fe401fcd8d8d2. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/CH7812400554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c65dc9bb212ae3113a3c741050534a39414b86cf419ad57ecb656043320a54. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CH7812371203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd379e7aa53ee8cbfbf169ebf8c41c1409f99cedae9d38511832771997c7e4852. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/CH7812400563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d271d6fd4c86b46c7e8d02bbff9d484d71dd69ff7010be2607715deccbc53ee. 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/CH7812528341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8371ed7727cb91d58d3bf2a50bcf5fca8913a06bca3db5a6f555cf8befb3b22e. 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/CH7812528342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4af585491dcce6ed77dbadfb4dd96b126778c42c2413665f1a49099cccde423. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/CH7812528345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31fa7789ecb8b568862f198596ff51eb2dc80ef0cc2ed56d0efe660f941ef199. 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/CH7812528346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52e271c1c6f14cedebcc7f5a960334e2a3687d7d417eb702006bbcb023339bb0. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/CH7812528347.