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 0x2b423e386fb99ac318c740d3326b4cac1431494b11797b1645ce5f2eb963f49d. 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/f9837be1-4834-46b0-97fa-102176e01354.json and https://artists.proofprofile.net/proofs/artist/f9837be1-4834-46b0-97fa-102176e01354.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 0xccbd9d32409225a95ce5c89be956b65cd3d83e18d8b0442f014471b9b96d9617. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/DEAR41898622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c1735e6e01da51718178d7f10e86d81169136b7e599b20c6a13ad5871cbe06. 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/QZFYY2077675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a7855e2ccd2342042913499c06059a746b0e89a29c78027278859dfd0f069cc. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZHN52007507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x397b80df32d1145d565ed085b4784e1dce7742e03bb19fbcc20c1549af925a9f. Chain 2 (Bitcoin): anchored in block 958832 (2026-07-20T08:28:21Z), 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/QZNWU2285792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa783fb4ecfe8a16b79e24045edd3e7f1caa253eaa857778c43a41d4f55f27bbd. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T17:24:12Z), 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/QZMEM2362069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0b169c0e74f7c7bb765a8fcc03b30321ee1bd3ef949ded10423823493d776d. 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/FRX282480180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa241a70576ea0c0eda50c9464579ee347cf42e5ac810e956dbce1b20d72ee27f. 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/DGA0H2373262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd098be879309f59d13bcb4bc121452934ea7561282330da65cba0c387828bd22. 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/FRX282480181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc1e5d6885d62fd4d3cde85049ee562f4e6c3207bcf6edfdcc68c6682290e39. 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/FR2X42402057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2583fc73a4b918c345196137a1ac6f153f7f711630d284ad369b8336c3043d6. 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/FRX282480182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f29923627d602634b4e3311eb8f1e02c69b03f6fc4b0fa5a59ac05cfca227f6. 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/FRX282459484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f8c6eaa9a5839470c09cf0b221b1bd163a57b12ca5a9cdc21b49e56817b028. 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/FRX282480183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00660d58a3cc2feb8e2ba8b9b06247cedc17e25dab6d6bce2f6d283260a1b351. 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/FRX282480184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5761a4521adad6c7b17a93c324f3ee5c29edd90d172ad75d5a492509d54b12f9. 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/FRX282480185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x519595053d9e5b59f53c843d196bc4481efe415c15a739f55ed94d9161a3b98c. 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/FRX282480186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b73c4a981f4b23d9a9a3d3c723ca22d735cb38e89d2afe78e6f0bb52c7e226d. 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/DED832500584.