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 0xc194823b8614679dcab7d01162c8293e8e941e0e7265a02401f25a733193ef71. 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/ede8f7f7-149b-4d4e-aa34-3531d0dcebac.json and https://artists.proofprofile.net/proofs/artist/ede8f7f7-149b-4d4e-aa34-3531d0dcebac.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 0x640112f4494b246ec4f09fca17bd3f8f7883ecf453324d8f5f07af6b92fb2f2f. 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/SEXTZ0700106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342bb3c914f3f15ba1aa96079ff5622768a6141c52fab3144aaf93dce5a7756c. 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/SEXTZ0700101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48f55f9ef7162264e08ef02818e74fbcd1587742b6f7c60c9906b679da5578c. 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/SEXTZ0700108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f962bd94d3e2171942e28fdf2a0fc6f50cf03aaf989bb7d4adcc63bf003d78. 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/SEXTZ0700104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcf6d05e8ccf92ebd53f3cc8bb30a4603291f38cfdea0e5330ee4eef5c59de79. 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/SEXTZ0700107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebe20eb0e7c9d09c642c36f75bbc6a7142603e753e77848a2d6046cfac8b6fe3. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/SEXTZ0700103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d32c1fa2e86212ddc6dff56602e20fbcf3ee99a744c47d3da565a428527527f. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/SEXTZ0700105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x476bf9d37e08de8de6186163c72c5801c1bd835537059ddf9c261b4675e36352. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/SEXTZ0700111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf5cc90e06ce96fd31a87329014c4be52e49c35ca360ec1fa9f4a7f8bd3a914. 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/SEVLW2311001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf99c8a15e7fc107e641a9489ae14589994e10f6f4dd676d68fe44e3deed33090. 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/SEVLW2312001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09536e6418362c202d60f29a00f821109ceb1bc4f6f4882af85fab11b2a6474d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/SEXTZ0700102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313519e7db16c6490b1b9b7b25270d9fc73c05df65172260971051afdc0c6882. 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/SEVLW2309005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920cbee3eac4ddc82890ad30112fe206e8c5bf0f8d87702953ce5f59bda34ec3. 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/SEVLW2310013.