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 0xf6269eb53ff9c8d3e06472083af470ca836d9dfafad235c719d01c034fefb8de. 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/d75fda3e-aae3-46a3-93d3-27cf7845affe.json and https://artists.proofprofile.net/proofs/artist/d75fda3e-aae3-46a3-93d3-27cf7845affe.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 0xb0701084679fa7376e7a1276453fe32ec84d7063dca06256ded7b3a45d56fa67. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/FR96X1970337.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4462d98b9ad485a4cdfaf340affe7f0cf61ef6be87355b423e6ca3f6bb8936f6. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/FR96X1993781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x192d7d0f8385f24faadc256313a4b780a23f62a2a860e8b54e6adc0ae08e786c. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/FR10S2006135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02e2421030174c1c8f319bf89e24f80ccea12f29cbc5982ccda1b7d91ca36f9. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/FR26V2065708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9ca61d43f4b6d8c77d37a74234843a5492c10381c1f083230b7d1b632995695. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/FRX762089326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6af71d08e9fdd8b547f455191463adbfad4594416dabda1bbdf2f6054beaf259. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/FR96X2148146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec527cc45836ae7dc3cb14e811949ea15abe320ad244f36be39a13294856837. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/FR96X2148145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0219493078da3a9b9d0b69dd2398376701d4f00c3a4f489e44f8fe5018e287. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/DGA0M2460396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0219493078da3a9b9d0b69dd2398376701d4f00c3a4f489e44f8fe5018e287. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/DGA0M2460396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d4be2a658216440b401559afd1b7d6ecc952b7e36c1fb4b9a2cb490e947d71. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DGA0L2451214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc9d340e7113653b7acb5fc1ca0d9fa962f29e6e1db33ac1069c580692c5585b. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/RUAGV2500747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98cd33eba2027e5bb04f9c9b2695a974bacceafa3fe74d5d6fd005a54f0c03fa. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/RUAGV2504113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafcd173dae355b43cc7da9e58eb1e0021edba413239a87d5ee074203d9e4b494. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZMZ92585589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f12482cfd3e50aebed698d549c267a2244a57176cded9748b236bfd1ef4025b. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/RUAGV2511493.