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 0x3688103f6d0681629746d60f22b9f9c4c77cac6c9df9885a2380afa5eef99943. Chain 2 (Bitcoin): anchored in block 953696 (2026-06-14T21:45:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/72cfb288-2818-4b0e-ab98-d4f1ba6932eb.json and https://artists.proofprofile.net/proofs/artist/72cfb288-2818-4b0e-ab98-d4f1ba6932eb.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 0xcc6db28ba0e0145e6011535158caf3911ce1099c24fdc7dcf8492f6faab06ca3. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZHN62331320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db985af0bd2f70034bb2f02962ad3356f7e16b155c7bffe1d34afe519c7853f. Chain 2 (Bitcoin): anchored in block 958756 (2026-07-19T16:12:29Z), 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/QZES92368388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78336264b8dfe56b79dcd4feb1d23ce87b5cea9b67ade0399c0d42580e1f1e75. Chain 2 (Bitcoin): anchored in block 958653 (2026-07-19T03:54:23Z), 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/QZWFS2312642.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bca06e65e6bb1dd93ec74e5025d46dc003a9d785adb722abffd63b1c7a93b53. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZWFS2312643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e831605a15eb5a724dade7f7318c313f845311634425e987b641b96f1863331. 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/QZMEN2492551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02522fcd94d2821bbc9869d0b0cc2bc9c9397dc37a13653c6e79c929a48be0c3. 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/QZMEN2492552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9046c2a821341e6b209d5e1add419e7a1614dca95160939a9a97e6c9894fbacf. 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/QZMEN2492553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5878e202031540c2630831567279c9bd7d6c30ef28baddf72e22ba00b68ca127. 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/QZMEN2492554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333f15e0525d621d32d31ec5646399b12d93ad94e6e52bfbd4d38c3caddaebd8. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZMEN2492555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85823b159b7f94dcdff41b79fd6d9e4cd85486d718f7233b01fda8d599ec6824. 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/QZMEN2492556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57c7e4f37351af28bd95d787ac4142ad1b251cbbcc261e25a173e177923d765b. 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/QZMEN2492557.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50cf238b228cddedebf3f2e0b0ae75e8aef47a28ca10fd48684de66c0bf2cb41. 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/QZMEN2492558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d350feb1a835181e40aedc124b134db0b930a47347d25afc4170a19bfe26c2c. 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/QZMEN2492559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8de936d0fafe7ce82c60b5c0a591bf59957c1ea1c678431bb6d1e2201115f47e. 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/QZMEN2492560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ae7ab86bacdf40c15e9d966169bfc64d458ec8479119aab1cc115a796f7abd. 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/QZMEN2492561.