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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea45018647da73a4396db7042d45371ab0486b77b5cd4f7569064a5d1c26b7e7. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3ac9fee4-79fd-493c-bfc8-1325e1e2c40c.json and https://artists.proofprofile.net/proofs/artist/3ac9fee4-79fd-493c-bfc8-1325e1e2c40c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Si Willem Nijholt Komt Binnen - Live 1981
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ffe1f2fa8dc702c578a7e7194e9526c840babea968e95355db9503e86a0b28a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLA308100125.
Mevrouw De Gunst In De Ban Van De Zwarte Kunst - Live 1981
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98464a76f6b0669725ea506003f26df04812c325262a3ca891646fb6c67ebc78. 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/NLA308100137.
Jalan Kenangan - Live At The Wisseloord Studios, Hilversum / 1981
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa3adfb8abef02538ed14a08fad903a063daa30cef556de91253fc260389e957. 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/NLA308100029.
Ajo Tidur - Live At The Wisseloord Studios, Hilversum / 1981
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b6f3e6dab5b7396775789509b97ffe03223700d2b4c0c495b019227ee8366fb. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLA308100031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee7de9a805748b9475140fb8e766e384e0684f94fa9b27ca0aa0d7dc3ff456d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLA308100135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf0a08644afa43fd6ad97b23318ecf5d5f47afe6e8ab8f47269a53d221abfbd8. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/NLA308100127.
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
Het Betjaklied - Live At The Wisseloord Studios, Hilversum / 1981
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7616055adce0d0faa2fbcea2e065d660b235a86b23b7b86247cf6c435400335c. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/NLA308100030.
Telefoneren - Live In Nieuwe De La Mar, Amsterdam / 1971
Wim Sonneveld Met Willem Nijholt En Corrie Van Gorp I (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78dfbc083528d78d969d9d5a65bce9c75406bdd63eabe6cfe343cf2d429f4b4. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/NLA307400164.