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 0x7926141de5b42b52baa8bc7f8c0276dfcb5c9252ce0722dfdab9233dca3aa79f. Chain 2 (Bitcoin): anchored in block 953621 (2026-06-14T09:42:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/20081542-ff7f-4e20-8a9e-ec5b9b261483.json and https://artists.proofprofile.net/proofs/artist/20081542-ff7f-4e20-8a9e-ec5b9b261483.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Variatie 1, Andante con moto, "Wat God doet ,dat is wel gedaan" - Instrumentaal
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 0x2cb7b8282c70f687bc19f8178d4eb017e3ee8f5832a29889f06434773857a213. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/NLG620582993.
Variatie 4, Trumpet voluntary, "Wat God doet ,dat is wel gedaan" - Instrumentaal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb6752ac04b1ffb5ed54347741abf66d608947a1fe40d36607f8dd948ef51f90. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T16:28:12Z), 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/NLG620582996.
Orgelkoraal Psalm 25, "Heer wijs mij toch zelf de wegen" - Instrumentaal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed9c8a5c4ad1e6af8c773574c46e88eff82949c4c0284885042373514e3646f5. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/NLG620583008.
Dutch Christian Mixed Choir "The Mayflower"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x715a8cb74ab4a70e184acc8d9c8597f24be16939019c2662874eacba3995fb75. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/NLG620616142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41fa9ec96531c9fb8ff140f4a752898f01235008ec83b9dae153919343e9f687. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/NLG620616147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1651c93320be45c1913594b0ac186c04b791232acd324bbab0bc2fa4ab9b6a8. 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/NLG620616150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd37286616ee44c4a7a9777d3adaf58bae46edbe4e9f5356fc2e3a7eaec610344. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/NLG620616152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaec80e9b2b77d670cf660135e119057d9282380502d57478f0fb28e852d80e2e. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/NLG620616157.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69a4e1fc504668344e4caa194f28e98aa36916a41b76810a1b8ec235eb5d963a. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLG620616159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b1498886d11acb4dbd4acdbb5e7ff1c76af714f017df456b49fba0665d60175. 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/NLG620598635.