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 0x31af45ccc0fda63f7263626d561a25d129c0dc0bf555343b72a48f473f1b6f35. 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/184c903c-8415-4cf6-baac-a0319d1f1dee.json and https://artists.proofprofile.net/proofs/artist/184c903c-8415-4cf6-baac-a0319d1f1dee.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 0x9177550c65963ee373184fb8793061e0406a71b527e084c7c380a97a9736cfc1. 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/QZTB72495836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304a00d140556777849377ad8e9ec94c7229d91a7c3e9deeb3e163254e802492. 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/QZTB72495837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd194e51c9dc3009ec8da303b44de78c148dcee180cfd7a95e2c146e782deb2cb. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZTB72495845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1ec677f5011b83efba09f2f120b98cea262ac181e54be5875805f242ce10d34. 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/QZTB72495847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x679b0a25f16d8979bc83bc8bee2293d6043b3c85e050b685886a0f4e10766c69. 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/QZTB72495849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ca91f2c769f3b1e3f45bdc457ed8b4ceffab39448ad41acbf8e52163d347bf8. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/QZTB72490724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85306ee1b1d817e4a35dc7d7f21fa5ee0bf5daf8c2f62189ed5c1538fc5fe43c. 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/QZTB72490725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1710b77c047f10f56d8c458ddd54a3a857da8cc27232519d9886bd71fad6dcf. 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/QZTB72490728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba7ff4969d360c13d751ba00e8bcfc36a4be6c149d6cffdfb532bd94a754ea59. 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/QZTB72488498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0514c6a09b1daae0de6ab487f864cdff19a4a32a0484c630c9b4f45765a7c82f. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZTB72488500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4e6e1fbfea86f7caa5f9345e80aa70136a2ea5dd5bf8015e295b4ec01775aca. 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/QZTB72488504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0257f3373bd53b9ca08f68477c5b048b76111af445583fc7f05093698d81a0b2. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZTBC2467011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf7f7d351e535bfd4a2d162645fe7aff1b3a5182b0c9021cd5e4a2c3c777dc8. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZTBC2467020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2557bc03df88ae7b5cd17f07e6e0c7109b6d866e309e121c79d150ed67a144a0. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZTBC2467021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d40840f0a983fa0e752f0715c29943a9b35027d377657372ceb4d690931a9bb. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZTBC2467022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a521dc3ce3b43209f6d359a1d0775e4e11db9c0b88dc3526280ddde72f83909. 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/QZTBC2467025.