Rudolf Werthen is a Belgian violinist, conductor and teacher. He is the founder and artistic director of the orchestra I Fiamminghi and was chief conductor of the symphonic orchestra of the Flemish Op
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 0x72c55fd6ecbf35bcf4dc43c246e594488ea2a7b0acce273963f4d3819788d973. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0a53c377-4422-45eb-8e93-04bcf15797b2.json and https://artists.proofprofile.net/proofs/artist/0a53c377-4422-45eb-8e93-04bcf15797b2.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Górecki: Three Pieces in Old Style, Good Night & Kleines Requiem für eine Polka
Kleines Requiem für eine Polka, Op. 66: IV. Adagio - Cantabile
I Fiamminghi (The Orchestra of Flanders)
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 0xbbc70c5fd1211e72d7fd64044bbec1fa5dc0feaf54286aeb6bc86bcd76cf9c6f. 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/USTE10407417 — a six-check JSON result.
Symphony No. 6, Op. 173 "Celestial Gate"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d3a99c6034aef78fb12910b77bfbef12ed99f5b4d506baf90508deb22faab4. 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/USTE10301392 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf38508505b0b5503c1b857b98e3dedf4375edf35ce3a30ff666d6eb25797a15. 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/USTE10304392 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fa1d3db2686760e3c1e7f6ed76f0b09e0f2121144a4509249743fc41aadbb50. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10305392 — a six-check JSON result.
Fratres (Version for Strings & Percussion)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa899dc65143153f1670485eeda8e741073d015aff4d365a90f26c042ff0431bc. 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/USTE10301387 — a six-check JSON result.
Fratres (Version for Violin, Strings & Percussion)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04f1b2ea669f7919fe1e1a880cdcf533ac9cb4ce364ad7a7702805bd6f06884e. 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/USTE10302387 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9559b5670b38ade0fb3892558321c8a6082651816d938de3a89b05486990a413. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10303387 — a six-check JSON result.
Fratres (Version for Wind Octet & Percussion)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6707095c06683dcd48f40634229f15e054b25fe851bb0fcfe76be2fe8624d7da. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10304387 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f442f6a2c169cf16efa3ab8e2502b1af93f1d98f23bb6b4ae3e3431d8072fb. Chain 2 (Bitcoin): anchored in block 960101 (2026-07-29T11:46:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10305387 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8127a5e1877e4421b03fa742c7f7b4beecdeaffff21685d8ff873b1253d0e48. 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/USTE10306387 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d2b1ae60b3b6fe74b7f00bc773880f7c4014aa66656cc9dac6427bb3b487edf. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/USTE10307387 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e5f720dff8adef44307d677fbebec6573ce07dae6b548d8c8380af4bfba14c. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10308387 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ae20de2ee8fc19f5412a87bcb5150d12eb7459c33de6ae16002c964904aae84. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USTE10309387 — a six-check JSON result.
Concerto for Harp & String Orchestra, Op. 267: I. Largo, maestoso e grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a1d067a8c040aeda5a8aebbededa3aac1d8a32320ce8cea91ac48c835c45f5. 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/USTE10306530 — a six-check JSON result.
Concerto for Harp & String Orchestra, Op. 267: IV. Dawn in Paradise. Adagio rubato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc342349d489398bb035ddaf6a461a64f721cd5916f922847e8b3d52d7f1ee84. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USTE10309530 — a six-check JSON result.
Concerto for Harp & String Orchestra, Op. 267: V. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x818d7fd4320814467e4c3b6e231a8b9484b242ba903a1e3b6ba8a9bed94d4cce. 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/USTE10310530 — a six-check JSON result.
Concerto for Harp & String Orchestra, Op. 267: II. Andante espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb740839c353ade7ba49b4a66999fbf733ba371e7fd00dc7a5da1e4f1c9565e48. 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/USTE10307530 — a six-check JSON result.
The Four Seasons, Violin Concerto in F Minor, Op. 8 No. 4, RV 297 "Winter": II. Largo (Arr. Y. Kondonassis & R. Werthen)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ffd28ebb50b9b157a19c06aacb536c414eebf24a462a239cfe1161365b99c88. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USTE10311523 — a six-check JSON result.