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 0x730b1b13f1970cffd463bc725321e80ac486efcd58329b39d3157f0e9125c85c. 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/4a476d09-def6-4875-a667-84bc79f97c9a.json and https://artists.proofprofile.net/proofs/artist/4a476d09-def6-4875-a667-84bc79f97c9a.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 0x98208e83602dad094ef6f2eb3b1771ade9153f1af8b24d242231fed46b6faa1a. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CH7812181003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x617e9b420fc8d2c39e9b1a3836e0c133236086662d8da115800242bd3cac75c4. 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/CH7812181004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25d518173d36d3b796d10becb14f483e590a09f3749ee73f92b877f217336db9. 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/CH7812181005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x314f598db186068d5daeeb84dd2f79a98344c7d6ca0c6baeeed6ed8c6c58359a. 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/CH7812181006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b64984c4179793c135a83b90c3223e83f7e883f7103d12a9eafda8835c100e1. 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/CH7812181007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35aebdf08810bc0e35f3f840ada7a1cf89079fca8ad8d884ca48881bf314ecc7. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/CH7812181008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ebc5ccb0e6557d0ef55f2bcb94bdad8d8d6a3a6b88bad9564e0639015d56feb. 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/CH7812181009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f42304b1c89eaf193ccba8f65328cfd5edb8dcfb0a47512336f9cc6607985be. 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/CH7812181010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc877bf4c6b51f94e36871a95b46c16d359f53d6829000664e2ead3765d9687. 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/CH7812181011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b1a62976db8538d461bda1f93d6e0b3bce3ac1b83404585ffb698a7c0671fa. 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/CH7812181012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe201f1440f4fddf1d8107794b866539037744bd891a5244aa8cbdf54b7632731. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/CH7812181013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eab8fb2357f6e31c9bd5859fb3b28b021e4a3c32f9b3f5d3cbf1c7801a23223. 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/CH7812181014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8d4df7398241e61ecff3fbc2327f520fcb5080bac076d1abc2eb9db61deeee8. 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/CH7812181015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45bc634d16427e00babee7b5b06d1af80311616a8c3b7736d7c7181ccc324b88. 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/CH7812197982.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x042d39d9326d7a2beea33db1f1059184f4c8e244132545829483c75a9b1e27f8. 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/DE1CZ2300032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe459e5f5f871078ed0dfcf2585f42f5f0d00afd88e9d7a56eb2b5944551e3112. 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/DE1CZ2300015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf55827d1be98aca4c06ea6104750294481279fc8dc50428e9926244502e2f254. 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/DE1CZ2300033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d7856fba54e2501dc7c1ba5c1acd17085948358b9dd0ab39abb48249ef6d0b8. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/DEPI82308202.