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 0x16093ade0b966f3def55a0164eaef532805136479d328a0a5df7cc08dbe985d1. 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/384e8a41-779f-4f0c-a39b-8a13b1aaf3f6.json and https://artists.proofprofile.net/proofs/artist/384e8a41-779f-4f0c-a39b-8a13b1aaf3f6.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 0x81e7b5f86ba90ba484e55dc9a66b381ca68aa63a45cc851a5a36e3081ce50bef. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/BKUG92400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68e37f34a4a77dc334b42021362076a57c27cab1f2436f2203bf73eac96fd2b. 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/BKUG92400047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6a034674ea0632192d4be865bef6821e0f08812e65dbc5ec9df0ba5e2cb7d3a. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/BKUG92500099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77280a75d4565fac09c7bac81b0240b0006dd52807203bd9cc4d63e5f0bfc5b8. 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/BCD592300083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98b9b079152b9bd5fc8289668cbe49eb1c60e85e76231c53c5fc24e2ddb0bdac. 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/BCD592300104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca004a2ba172826fefa51efa4c84829938a3fdc5f6443b648ad7e4999401c597. 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/BXLMW2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c7d8cd67ce2060ce2588898df63319a2faa56c94bfe4af71ad70e55550239a. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/BCTVC2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c7a2c930d3fbd8222d245c142106bf7316771f486ebb9e7bc54f82a2e37ad9. 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/BCTVC2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c7d8cd67ce2060ce2588898df63319a2faa56c94bfe4af71ad70e55550239a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/BCTVC2300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a467d8ff280d88a2d1a2f4d2b32da048094147b7d5588835429fd9977d7237. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/BCTVC2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x571b482da82c84bb8ce4000b49de7947dbf1483daf0a5af56bc113dd7e738322. 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/BCTVC2300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5a467d8ff280d88a2d1a2f4d2b32da048094147b7d5588835429fd9977d7237. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/BCTVC2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ca43385a8985e6e1033396b5abfa3218af29f5c1f7b94fa3bcec7a2cfbfddf. 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/BKLY42400093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x104ae3149981c99b81b0a7a2dfe78c9cec6bbda0fc6b937071c6ea3db3360f8e. 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/QZW9K2428718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d9e985909603166eafac305459ed117cb8aa8704bff6a027628b7730252711f. 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/BKLY42500039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd274a3b6005eef6f9373ae3e6d2d31c5d0dc5d6d99735e9e38d1f4f162968f70. 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/BK1SP2400021.