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 0xefee7f74b114ae4b0b5823f3ddfd288c53e3e4def148e3487a327fc43a2d4b29. 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/bc10dd6f-5cbe-45b0-8c7e-8ac16f6dfd8c.json and https://artists.proofprofile.net/proofs/artist/bc10dd6f-5cbe-45b0-8c7e-8ac16f6dfd8c.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 0x6cc629f8420d149f266a8c3a3bd180b44605e53f60c19b60239cc762f0bb1674. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/INA2Q2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x571959b8580e3059b5b9c34ba1a97ef21035ad185966aee1728aa3a595d13af5. 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/INA2Q2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8929cbff10979a6d22c51f222d787746957b24508db84506000510d4617a7fe. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/FRX762339199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f525aff9f2f587b9039a010be423122fe1d5d0910e954be5f1b38d756ac6ce4. 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/INA2Q2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a2dcf70353be53e1295ac24cd5ba1871ade541d2793e910c9e811491cb9982. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/INA2Q2000009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe369b303a4e4ab3a60598f4560191eeffa994eac37def57c694ca388a635fc16. 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/INE182117880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb23fabdfa9dc2715f0592fa1354f680519db853eccc915fecd382880287eb679. 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/INA2Q2000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1cfaf018ab565ceb5ad52d7fd606c6164a14d9c79d815d187708a6fb175ac95. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/INS182006724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda9b0a359bc89dfc7a71fb6b62f475a6c7e839b75b23ff9c0ecfbdfaa3259bd. 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/INA2Q2000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3c316fcf7ca251a54da304050daaf4b0ee41c5de90363ab8c5ba8d413342d7. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/INA2Q2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d351a72be42d2b2fb9932b6b082e4bb20fc1a1dc6f774fbe4da3488a1e37e4. 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/INA2Q2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd43c6e7a8a7a4d1220d8c15c8a0d1707af4083d1d3effa32b6ee79b6ef114c8. 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/INM5C2000003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d4dc88a7d10d406551f679e18ab11d99ba324813ab22dd38a412c1b54cca2a6. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/INS181905947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe688d742e3a51a8239697c5e30117603af59fa36f823df9265a1d52afe972f47. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/INM5C1900028.