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 0x73e5d1152afb31a9001d71ca0d0a20c065a278e9800299e9f65122f64adbaccf. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c989aa7b-3963-46e0-b216-c6b3e554533f.json and https://artists.proofprofile.net/proofs/artist/c989aa7b-3963-46e0-b216-c6b3e554533f.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 0x1da8448fe3098a760efd17e3a8a19108fd00ed6a95b02750eac401161a83bf8b. 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/TWFX72000101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0b3a4b1e2277bdfc03e6a3c4a4c88d5996e3b92cf6e413664f8dec96613665. 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/TWFX72000102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495c53ed8b21b2971c44531eeaafb569566d6da7c21f761083941748cee106b8. 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/TWFX72000103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a8bf8b75a738db4c78a33f418c1fad61864e63164b286dd4ebe9fe0b97611d1. 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/TWFX72000104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15ed71c4d8d1aaea95826a59f8eaa431fab6bbeb089f67d91154d84b9cc83920. 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/TWFX72000105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa89dacf8554896481247c7925a1603711e150d654b5e39c76626535e3de4a55b. 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/TWFX72000106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc5f459c0d687a3139d702efd74de7889ac6390bfd3dc28ccb8b323d7cc55ce0. 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/TWFX72000107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39e9882344e50a8a4243ef2eb73511995b14a93ad96ebe37426104a2e80ccac2. 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/TWFX72000108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8df807f4000975136ad4ffb97a268bf5e36a877ca04924a972fd8f17a60efab. 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/TWFX72000109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da8d80e6d554abd3530d6167e617dd60ffb35cd1b3356dadf55a91e552c6f9e. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/TWFX72000110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fd050178d7e5ef513cec7e4776e9292bc75a5093327a1207692653839390953. 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/TWFX72000111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bfca53f5da854aaf6d1a88db8c7eac8f87a7986a55ae79ddb4f572a2fcda155. 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/TWCG52492868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0b3a4b1e2277bdfc03e6a3c4a4c88d5996e3b92cf6e413664f8dec96613665. 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/TWFX72000102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da8448fe3098a760efd17e3a8a19108fd00ed6a95b02750eac401161a83bf8b. 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/TWFX72000101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb12b7eb64487eb003502db932f1842617ffa2c6914975c4dee468630c639ab. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/TWFX72000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x773faaafddc47fd5e06582db498c412d1ec76858e169e0574ccd34fa8b1c6b9d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TWFX72000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa4db212a7c1fc9cb327cc63c6b952532113aab699756f6b25f8a1d4b875a37. 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/TWFX72000001.