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 0x4a78271a08228a185c86d3d40a739b6464071f800ae8cb541519f93fed8e4770. 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/6f2a9b79-3bd7-46a4-b110-eeb4ab7191fc.json and https://artists.proofprofile.net/proofs/artist/6f2a9b79-3bd7-46a4-b110-eeb4ab7191fc.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 0x26a687f310bdbdcd5d5ee3837d7526a46bc7f314aea8d7e4e33b90ce0c2d5ea5. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/TCAIR2474552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb72c56d4638f3cf528a1c4d70d924e3c35d294a67568424642f4ee43ee4c444. 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/TCAIP2400542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb5e1e81e65bc26739e62970e56cf042062251bd92e81742db41d8aadb9d686d. 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/TCAIB2488411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75f98c902898e1fea946e920ecd35a1d472cdc7ecdc5a241446bda4329dc40c9. 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/TCAHY2457229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a09f33b01d76dc38f9b28b0cd8a6f0b928dab1cd984a571bdfd42d1cfa7091c. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/TCAHX2434461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc083a4ba2990a8de7ed58e1827ccc214d05019831407e07aa509714789370b3. 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/QZFZ42447388.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b48a4dbf2202f49b8d5e87e7deae2a775fc7c91675c4fecab24706221256d28. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZFZ72426270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe85eeea67a73b61672d21714f19ef6436a8c67f4e30446c4c34b22c1f68755. 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/TCAHS2371063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31523cfdf62aab7183514426bc9f17c6b31ba8bd10b0489d1f3b63e18aa9c6f7. 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/QZTBA2338446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ddc41f2569fe4d623b661c30505bcae5761eca9c46f54d042e3c6863c1db24e. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZRP42398250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28aef45c64d2431e8fb70a530b9f00d1dbc351b30e7c59ac12028df0809b8a7d. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZMEM2365990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e30b1e5dbe21153c1ff6eb36e66088502b88ba6ce35bc1927ee0dcdfa8fb41. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZNWV2198525.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce8e963d3a579a05785980e7945045797cc32755f9e9ec47defbc3943c95e0d7. 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/TCAFK2185167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43b7d423ba6de91d286da28d6c391d2f88e92542db200617ff742fe6490d23ca. 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/TCAFK2175900.