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 0xc0b37b619188b3df18b286093c338bea29c4d6537ece04582a975f2ca607ee90. 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/f9a7dd54-c85c-4271-82cd-cf21f7cdd2fb.json and https://artists.proofprofile.net/proofs/artist/f9a7dd54-c85c-4271-82cd-cf21f7cdd2fb.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 0xf55d7a8f03e68d9551e6f4b40a78e899e4cc6ff522d7d8c889808d6565444a38. 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/NLP972300018.
Beste Zangers Seizoen 2021 (Aflevering 7 - Anneke Van Giersbergen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f86ebb6a9573d498e70e28f42f8fa0f0fa9542e10658601aa5d50bde1458984. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLSU32100046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61cfc103e90e5a3aeda7a8ef710037be2fc1fffdb8f817f20f4dc371a966dfce. 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/NLSU32100052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0552761b0414b28711993deedd1da1c349607eda4d77b564dc48c89f9e6f50f6. 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/NLSU32100040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f86ebb6a9573d498e70e28f42f8fa0f0fa9542e10658601aa5d50bde1458984. 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/NLSU32100046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61cfc103e90e5a3aeda7a8ef710037be2fc1fffdb8f817f20f4dc371a966dfce. 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/NLSU32100052.
Beste Zangers Seizoen 2021 (Aflevering 8 - Duetten)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61cfc103e90e5a3aeda7a8ef710037be2fc1fffdb8f817f20f4dc371a966dfce. 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/NLSU32100052.
Beste Zangers Seizoen 2021 (Aflevering 6 - Joe Buck)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0552761b0414b28711993deedd1da1c349607eda4d77b564dc48c89f9e6f50f6. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/NLSU32100040.