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 0x3fc0f3c8562bc8f5e5375998f58eec9d0d614892cdd1dfdd28c75c4feb7020be. 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/82085343-af4a-4371-ba77-c3b76b1c2c95.json and https://artists.proofprofile.net/proofs/artist/82085343-af4a-4371-ba77-c3b76b1c2c95.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 0x4aa973bab4ca7a9d7edd3769394fd2511116047037efd9de397881a4ca181f9e. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T11:03:33Z), 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/GBAZB2208463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f5e71519710b1276160eb7fab85e8e94549f8f4b5ae449b2cbcd619413907df. 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/GBCJY1800208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1976c9b604a7c5706454e232a87395e18c253ea8f4ffc12ecf79f201cb2a29dc. 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/GBCJY1700144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6dd75abadfb1d43aa9a9e4dc197c2748ab0aa0515dac6dbea5a985348fad1a. 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/CA6D22200633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x363720650508036499770c2f193305fad65bfebbcec917d643033555c511d1ee. 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/GBCJY2200086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34cbdafda81f8f7fea367e57d6ee33c638861db386914e0a778e54bcd1dc7100. 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/CA6D22100685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb664945885f45c9070df92a56a34ff900f7eb7e19e7d5247e91e0c788f3da1d2. 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/FR9W12245689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x801d90771df0082faa2beacbfd4d8826b2415098e91848e60df0caa80e8db75c. 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/FR9W12245466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda6dd75abadfb1d43aa9a9e4dc197c2748ab0aa0515dac6dbea5a985348fad1a. 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/CA6D22200633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3786a29bccf147b3df3e8d0e8213cca9886b1d9177725257fa4adb457eb8e25. 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/GBCJY2200311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa560b59fb855101ff927a7fcafb8467c4e41f557b15930c15a98a303a5921c11. 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/GBCJY1900166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe338b5fcf58c69118bd2a4637ada24d01e4e17b4a52b84acab7de0d946ce2747. 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/GBCJY2100325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4efe1652f7b420e2e9b258567c4d1d257e602bb47377de5752b79ca3cd334f27. 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/GBKQU2460121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf06409c9dcf8517b5ffb977a0e191c2f5a3f3eeb62531666fe2fcfdce2c84f4. 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/GBKQU2444344.