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 0xf2850f7b3af8e9c1a3508b0f1df123b719d6ee1f68b6e6b174bd2aa483e0f4af. 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/f366e09e-f28f-42c3-8de3-57c988efb597.json and https://artists.proofprofile.net/proofs/artist/f366e09e-f28f-42c3-8de3-57c988efb597.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 0x98c770bec68f2920a418c3687a51b77c277cc4fdfb5f05a8ca9afdeb8ea819a1. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/US3DF2042588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d09424edb65bd0520653968227b385c606ed1c4924884fdca1c54f06b9dc9df. 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/GB2LD2110240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49e0f9c508fd9720eadcd00da91e641432c018caef6305480a0d8ae87757334c. 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/NLUM72300045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7642bedf333017e7d84c407aa198fa31c9b82915fc27497fff157bc4d68a10. 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/GB2LD1800757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x991495f77d710c48a69db113a8fc5d68103ebe62de2c2b229584128cc74dc4e2. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/NLQ8D2200908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a9d98f3772d6f19cada3e355d5f8726ac018717f9018a01e89b6336efdb829d. 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/GBKQU2178080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x225a8116e5a5af2c2e088d51d27720432e1fb1ae232ac2c49510c9565a9a0077. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/NLQ8D2100923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfe4f74650601938c3357c96b2f6c3610fae3d25cf7814d20d5d71f72220b46c. 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/GBKPL1973482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa86344e41f65e09b72b98a338c7b669e1e828da8341d9d0d51ea96641f14ccee. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/NLQ8D2101537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bcabf9ddfde1a273896758b3c1e5c352f6fcbc326e8c715393e1b7f77b4f3e3. 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/NLQ8D2101548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d30171a2f8f29925dc9c0e5bafea9e4473473f6fc0ebd74a625f7bfa938243b. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/NLUM72300510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dad41695678c084da86cc469b28ce85ca5a7ea36b1e296a5ed0042bd1230917. 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/NLQ8D2000700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3657a60d3ef60385545436ca3281f2a342a5ba628b8cf75b190055e5ba57c71. 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/GBKPL1936115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12c07c4c454478cea8df25b4c2b5cbf0f84351c04f98efa6ea4701a3a43378b3. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/QZFPL2100374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d84f9867782d9e2d9bee3f993abaf7aa12c199a5ea66f1b83ce37a803506bab. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FRX762083952.