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 0x8e0ed39bb5f957667c6bbd4809a24b9375348e0bdd3d634ec3ac2e84e817cfa1. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d1c855b2-f489-4471-8849-932b09eaa4fd.json and https://artists.proofprofile.net/proofs/artist/d1c855b2-f489-4471-8849-932b09eaa4fd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Holten: Wisdom and Folly and other Choral Works
Holmboe / Grondahl: Trombone Concerto / Hyldgaard: Concerto Borealis / Jorgensen: Romance / Suite
Trombone Concerto No. 12, Op. 52: Allegro molto
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 0x4362074398ee4d4d4296df18b5a88cfeb463b543a5b5754354336b8d1a49c99f. 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/DKFAA0602403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3f82db3def1ed4b29f4c94b94d8544f90b4137601506891fe4e0f13e3efd00. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/DKFAA0602404.
Concerto Borealis: Rubato - Andante con moto -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e00fc4ec9aa4ef875462749baa4009c1f45b04886781b434daf2ab48b2b8a0. 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/DKFAA0602405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cf78bd4352d275dbbd2963d575c176f79e0f8a0b173cd7e194b441a734e784b. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/DKFAA0602406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02a87e24d6f82c1274e58b3fb9c6798df4c57f79a0a7a752c288a5efa84f871. 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/DKFAA0602411.
Trombone Concerto (1st version): I. Moderato assai ma molto maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe29d47be8b4b20c5de2dd0e3f5b19867e34bb542f1e5cd13ca142f4f1736d454. 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/DKFAA0602413.
Trombone Concerto (1st version): II. Quasi una leggenda: Andante grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e3584b505ba2060351ff8c354ae49e576c8343f8975024b5ceeb9648073cc2. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/DKFAA0602414.
Trombone Concerto (1st version): III. Finale: Maestoso - Rondo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b54fc34888497e7c653f119acb97f4f809fd4e28425f230fe92785aa36fe9a. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/DKFAA0602415.
Trombone Concerto No. 12, Op. 52: Allegro moderato -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa9cca87e20719d55c1f721a1174296ec3745bbdc8c574e6fc8694196ea8de7. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DKFAA0602401.
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 0xcbb7849e6e56f52dd5f44b811ecc916d5cf5e01a72f7f900b6902c7cda2703ed. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/DKFAA0602407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a820629c41c5a7380194b3de8c89da2e7f7b955a124e99dc78322463a5a21e. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/DKFAA0602408.
2003 WASBE Jönköping, Sweden: Danish Concert Band
The Wind in the Willows: II. Ratty and Mole
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee87e745a217862c57c49efc69ee3520462287c95a1d5af1071642a2d99f6e6. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/USVZX1017504.