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 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, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 moderato -
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 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKFAA0602401 — a six-check JSON result.
Trombone Concerto No. 12, Op. 52: Allegro molto
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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKFAA0602403 — a six-check JSON result.
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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKFAA0602404 — a six-check JSON result.
Concerto Borealis: Rubato - Andante con moto -
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e00fc4ec9aa4ef875462749baa4009c1f45b04886781b434daf2ab48b2b8a0. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKFAA0602405 — a six-check JSON result.
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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKFAA0602406 — a six-check JSON result.
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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKFAA0602407 — a six-check JSON result.
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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKFAA0602408 — a six-check JSON result.
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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKFAA0602411 — a six-check JSON result.
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 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKFAA0602413 — a six-check JSON result.
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 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKFAA0602414 — a six-check JSON result.
Trombone Concerto (1st version): III. Finale: Maestoso - Rondo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37b54fc34888497e7c653f119acb97f4f809fd4e28425f230fe92785aa36fe9a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKFAA0602415 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73184f6442d99b770d1566f8ba71445b23be0cecbfdf4ec359543bad08ebf25. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD0506708 — a six-check JSON result.
2003 WASBE Jönköping, Sweden: Danish Concert Band
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25885e4e10b47d91cd8873c9f9cdc86a9d65041bc02cef05461d6c58f01eba0. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1017503 — a six-check JSON result.
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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1017504 — a six-check JSON result.
The Wind in the Willows: III. Mister Toad
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x745e2b32263c1cc3c20cabb4a2a7742f6f3aa2980d0a7cbe4bd67609c0f42108. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1017505 — a six-check JSON result.
The Wind in the Willows: IV. The Return of Ulysses
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d6ebf5421ff9a6c3b782176b6bc98dc1aec827a7a3e189ecc07991d38d59500. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1017506 — a six-check JSON result.