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 0x6efb4662c1112f5c8f076539c2726da34f8a80d73a62ca0363069d5328892db5. 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/d6a484ef-1162-46e4-8bb7-d69962b160ad.json and https://artists.proofprofile.net/proofs/artist/d6a484ef-1162-46e4-8bb7-d69962b160ad.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 0x9066683a3949c682636011a6e5404368fa808d3cbe9e561db59526c04afeec4e. 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/BXQ9G2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbcaff7924126f5f3a01e62da465c0b3fb4accf4bad560867e7c56ab89d64331. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BR8LU2200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93df7db4dd5c8aa5490349d9ddb75884f601bac8e4c5818a62f6410dd1549052. 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/BR8LU2200047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa75cddc25d115171070cdbf5d1ac678167692ec9ac1ac64a69d996812320bbbc. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BR8LU2200057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7516a5f1bb38ae4747bf4134a5a30a70a87c31952661beb85c118b59b764d7. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/BR8LU2300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f05a0550642c8bee6b49f439a7afe133a8ad0a432cd73a9ba9e8adfc18bd721. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/BR8LU2300024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19fa0aeaf4e5b02034ce399157feedbaf4db964c3067e0e9313c2bfeba8ff775. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/BR8LU2300025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x287e5d8438a78e8e0b6c3ed00476599bce78e2bb63ed55d10cb4bb45ee3ce8e4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/BR8LU2300045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7516a5f1bb38ae4747bf4134a5a30a70a87c31952661beb85c118b59b764d7. Chain 2 (Bitcoin): anchored in block 958111 (2026-07-15T06:58:20Z), 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/BR8LU2300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7abecdcd0d38bbbcf73d5cd8d07c458121d022317abeeb86435c7fba04b76a6a. Chain 2 (Bitcoin): anchored in block 957833 (2026-07-13T09:36:32Z), 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/BR8LU2300046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a6979a8e5f57400f7e6d9faa5682e4a12e0564db9cfc4307d96995a76157fae. Chain 2 (Bitcoin): anchored in block 958407 (2026-07-17T12:08:48Z), 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/BR8LU2300026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x692574770e604ec51bd43213f04f05420f0354346f452e2ff1b0e89a2e831742. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/BR8LU2300032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x736af376a5cb0c1f9d28dd6ac16a698e5c7124d4b57697a533e3593e786d6556. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BR8LU2400083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb4b44be25fa475d93a88ee3252e8850b7c4981b655fe2396f521d220b437ed. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/BR8LU2400090.