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 0xc65546e6a274d48f1e96ffb43699f3fab8e96a57cc7778f5d391c9715e7db81c. Chain 2 (Bitcoin): anchored in block 953758 (2026-06-15T07:48:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b43ee1c7-0192-4384-a0d2-f27e1da02a30.json and https://artists.proofprofile.net/proofs/artist/b43ee1c7-0192-4384-a0d2-f27e1da02a30.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 0x480b6b91226cbe50ee9acc2c8a415c4f9cb7f16024c8fcdabbebfecc2ab0b22f. 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/BCKKP2100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea91334ceb1e840e7710334a45d32f14711a3321597579da7d1b00e59506ef98. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/QZNJX2008933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90fe9aee4c63e3e851aa725b98516874e7fcbc2f895e50f540fae8355bbc76e. 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/GBRKQ2214588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce925341c01781f7073d8f095f4a3dd4a3e6ff87c82712fac0aaaff8a9e3f819. 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/GBRKQ2214633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93970d6f2ee8ac54dc0da511cd1ab2f549119d1a9a1970f05824131710fd3dad. 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/GBRKQ2216059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b0e00c6e05e00bf8650222e849398bd7b2d68f3c5b9196b4fd1205ff0c9f7ff. 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/GBRKQ2216063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68e42e5777f97239b68d63ffd9f30ca0761bc4582bdc2795cb09ed3c3f6cf2d. 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/GBRKQ2216069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21a6210e87814dcb3023fa2d63ef1de417e12d08433ee83ba91d35922f16189. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBRKQ2216077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264544b9e6a16f162591b78957473fe0cf90eb1a290d3ecda054c881d7b71f80. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/GBRKQ2216082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e4c1553822283505a5db1afcdb6f3d4b5b282d7dfb301326f9d40d8a27a38c6. 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/GBRKQ2216084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x632376ea1811c554615921e043190e91c0449d11933cf078013074a18a614145. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/GBRKQ2217112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37cbee88b24d2fd99c77c8695d640b56bc93c59623d4693d78adc3af91fe4f0. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/GBRKQ2216086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4920b8f840b4e0315713e66a087c47a267d5f50aed26731b2d85af38dc958753. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/GBRKQ2216089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f4a930eb352bcbcc7e3607dc8bb84913512d4e2c74df1609a7af9586bb60087. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBRKQ2216110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb0fd416ba36f98922b9303c6bcf3ef45f6d4e28e63d66d15cb8fb2fbe16ba2e. 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/GBRKQ2216138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a46d3bff5bac1206484349a35d8399b09895ebca021a87ebc05f96aa95db40b. 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/GBRKQ2216289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c867f159fd21c638d18b4e76e88b28eb4dbef010371dd0e6916de1ca022e9ba. 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/GBRKQ2216343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8a10cc64187b0303d9619a35930b5694b59fc6edc182016f755d2b97e25b69f. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/GBRKQ2217098.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55c0299ceb593d5d82139cd209fcd9270570171278393af5ed90f3e8fa58afe. 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/GBRKQ2216367.