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 0x50ad7a97ef958803eb292900d2bd112922a6018d7f8a8249d01d5bc3e91ad6b3. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5d575dec-abfa-47bb-9a1b-04c908994b70.json and https://artists.proofprofile.net/proofs/artist/5d575dec-abfa-47bb-9a1b-04c908994b70.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 0xef46fc58f4ad78c6cda508ab3e3fc9117aa737838c14bdb0c5a9a7a6dde58517. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T07:34:01Z), 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/TCABQ1348837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8bc003c55e54fa2edfb07b8cdb6c2e6754a47af2c203b3322efd7bc327b866c. 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/TCABQ1348843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d38e6b55fd7b3e12ad2b902116eb3ff5f93e69acdeaff305ed7bce1ec9b87c0. 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/TCABQ1348845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0402bbd33e9f8adb3ccb84fb45a5b9166692675ea8b55c17c5aae310fadc34. 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/TCABQ1348857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fa23041213d5e2a300ec9b663ba7af4734f7418cce36f75c7035e32bd1ad393. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCABQ1348860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06b0e31a85db369c1e9fab44da52b9c8a9ba89bb48d0b3c9a2faa6875ec8ee32. 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/TCACL1652045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d39591f92452b2501b9fef790110e69e2b353473e398ce01bc3945ef20fdde9. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TCACL1652046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89a230b17f6f68effa3631857685e83e19d474b87e69648d683f2c04987c2b09. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCACL1652049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f951ac24262a751b8b5c013ef82f6e6961d4b53a7391a8f95aee80980db967. 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/TCACL1652051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe1c66a753685fa3c42da98d2dc3bbe42e26bc7cd81d47a3b6e09f6e0b400fc5. 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/TCACL1652053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0436a09439ba9895ff81004e8142236e98e2109e6cb68788e8e072787f50f8. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCACL1652057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab0dc76b6d04eb9c8039399d9ffa6ac088bf73d6211816f3f2f7d2d060b78473. 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/TCACL1651987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559ec78663df5170404127d5fc913fcec3f9182ae1e41e70a4ae8404a387a1e3. 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/TCACL1651988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d92e93f7c5e0bec94b13e87e09f573f81871c878c73f4599121d17bcf9bd15. 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/TCACL1651992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25dc3b088530784ef6482b041f62bc2cc2aee46487945471de3d4b812cfe4c6b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TCACL1651995.