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 0x5ffe752c0595e08975f80f876bdb2f50cae5445959aab5c6b418c1b112fdfe1a. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/db3220fb-5a23-4b50-9694-f4172a207d02.json and https://artists.proofprofile.net/proofs/artist/db3220fb-5a23-4b50-9694-f4172a207d02.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 0x18b7e7f14e41718c07667f59ccf989a02fb2f0b9080feb0b989323038f1b9b9d. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/GBRKQ2484114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbf58b4d079dae26aea01f4e55a05c950a27075ef71bb48629be0d2650c20f9. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/GBRKQ2551116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b54485fc7a7ed94512bc7aab2616d80043329c3600f02b8cbe9f628028e135e. 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/GBRKQ2200298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c169cef2a9ff04dbec3835d1bae938f6050661133ef992b9d97e1210b8958c. 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/GBWUL2047987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67e30d2d25691499f64c22803d1b8a045b8db5edfd7147c419fc371b65a7b9cd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZFYZ2218771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf02b34ac6d38f343f8cd84842389b95b0311e89fec35faa1362367435c4d346f. 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/USLZJ2471308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39032c03273e25d07659ef4df4842bd82c06c0164e94a0e86b000df4d148fa2. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/USLZJ2365846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92128bb18bc4c5a61155f735835e92dcd7aa0e2575cec15a1d2d75f232366590. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/USLZJ2365817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe39032c03273e25d07659ef4df4842bd82c06c0164e94a0e86b000df4d148fa2. 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/USLZJ2365846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ea59ba6c8bc2fc4806680e9de89bda2e49db14c072d34eb9bbd5805ad4f752a. 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/QZ5FN1861447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f51d543c953ef4e10c1f10ab2ec9a6cad73c88ca4d72c14afda077024263b1c. 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/GBWUL1930610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb118e3f715c319d29bbad2abe9af12291ead0acd2f6d5fe1f1b285d2d0d441. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/GBWUL1930611.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6c8f1bc0d0102ca69c62e5bf0950b1ccd234b1a648f51ebd9db7c4c9a81c28b. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/GBWUL1930612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aea98e5d4bf5ac4db4d1e349896ca13ad1e331bd5596daec23721b1eeffae7f. 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/QZWV32447366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735269ef14dd195f50b6cfbe33d643efda71528d39ae196544c485ff64fa384b. 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/QZWV32451354.