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 0x9dd2dd8f818697d4d5f6bd14e8af484a4142ac9b91af24513eb306c79203a8a3. 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/0e5260c5-5428-472b-ae4a-4379908964f3.json and https://artists.proofprofile.net/proofs/artist/0e5260c5-5428-472b-ae4a-4379908964f3.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 0x256c0c0a5aa9a076f1f48030184a888998c92e5c8f7bebb00ae61fe76919602a. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/USHM81750127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe86da29411ebb78093786bb169015e408a120787b17afc837046516d2b9665d1. 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/USHM81750129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ecfd07e9928a2f3d15a6c8af05128ee98aba13554bbab29b076d9039e1bee13. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/USHM81750133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7239922cac9a049a1022e95b478a4b29c02f92ba87177788660f2c1e3e05582c. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/USHM81750132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf486e8362336cdd3efa7b9bde82e38c94d04d5f18eae06badab7935562c10b95. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZFYW2082467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d44816b629bcb8912a3b27f3b3b8967805c64b27fa613b5adde6a8a7e6f549b. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZJZC1900289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ae1e6f0d77541dadd7847fa69d39f105c4b7f4357b9d7df280682826039fea. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZJZC1900283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d8773447aa93d1d224297ffcbe66dec26933d58168497e575eed2cf1789ede. Chain 2 (Bitcoin): anchored in block 958116 (2026-07-15T07:27:32Z), 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/QZJZC1900287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2568f6437db37fc7aaafec7de553dec76bf2d8843374bf260c677445758db06. 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/QZJZC1900291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce36f63353146c50074fb0c55381ea37fe9ac26fae9999dab1a129a4fdc4760a. 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/QZJZC1900292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d8773447aa93d1d224297ffcbe66dec26933d58168497e575eed2cf1789ede. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZJZC1900287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e8ffb3011dd25b5bb167c01f5c53f21d8588ec8690a16bd2a64b62cf1e5921. Chain 2 (Bitcoin): anchored in block 958842 (2026-07-20T07:48:27Z), 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/QZJZC1900286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69cf8338d78d8fffd2e6387ab77e8b2eae7a1f6e9c500db4ab2222dd33a21bb8. 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/QZJZC1900284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942fe0202f460e8f25966c12b84fdff67d250579ad8591da2eb53b89855c9d4c. 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/QZJZC1900288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce36f63353146c50074fb0c55381ea37fe9ac26fae9999dab1a129a4fdc4760a. 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/QZJZC1900292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a6bcd357857cdbb47a6685cabff6e57650dc09996530fa73c5aa428d510716. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/QZAKB2155252.