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 0x2fa84668eb71a18587d67f865dd5fd1cf3001a6f31eabeaf3d9c13bf67817e8d. 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/12827f8f-0265-4a18-8c1d-6ea07d0d1675.json and https://artists.proofprofile.net/proofs/artist/12827f8f-0265-4a18-8c1d-6ea07d0d1675.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 0xc91d0265c872a17ae8ce88320e1376b18ef5db634a4093a0948a524af9c77db1. 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/CALVP2432873.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcbff4c2f1c78bc7b7ddc74e8403c129b6329fbb6230be5514997ad8719ff290. 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/TCAIS2460772.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53b9b6b7598dfb4b811450da3c79cb684d389ab6c2a37a0d86c6d3bab7e4f31. 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/CALVP2406377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b24cc53cfab0af37f6b5e0103c66807ca1c4acb87615ae544e3fcc2dd024349. 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/CAGOO2462350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29d6f2bb80abb2aa6dc1153f6ccb9a6389a7ab0724b5d3adfe85744113e1ecca. 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/CAGOO2462351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21db114f2d744d103e110efbeda4829936c7478a9b175d470f13fa813f33177b. 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/CAENV2454979.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ec4b80df165477614e6cc88c75d376e96c404b38f32d4561abcbcf322ea71b. 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/CAENV2441889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f83a9098fdb4908217512ffd3af269a98c07df7f48188d9dcfb223a727b52cc. 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/CAENV2411082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171b5bef8883995e20d7864d801f4d5634acb2fa420f829cd4aed08930eeaa8a. 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/TCAHY2447990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb0387055e8766361e21f28480c899049ee51a52558779c0bc4582cdce583be7. 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/TCAHY2446597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc24c94ee18a3eb53b6895e23f531bd4f969d2e0be4aca8c07bd8868127a0479a. 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/TCAHY2438635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ecf90d72f2a02fd80dfb7bc3d244be81cd347a89973d299a70a91ed16f5de2. 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/TCAHW2487180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8c175fef23f9335a6d23b560d672808d9d0d638a3b06a871c19e0b434688e8a. 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/TCAHW2426115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ab5a31dd689335f79d28d01dbce89fbdbc21c30856d200fd4166ad7436028f. 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/TCAHW2426709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d7d19a6105d427f4fa76fa1bf55ece2554329f7cb8bd5f8b055449439e7b673. 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/SE66N2307356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60f43e8aab4f24c2285a65a9c98bf34c4d82b17b2faff54a8aba320d1317b7c6. 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/SE6A92300502.