Orkest de Volharding (perseverance orchestra) is a Dutch music ensemble, founded in 1972 by Louis Andriessen and saxophonist Willem Breuker, named after the eponymous Andriessen work. The line up for
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 0x94cced2ac9fd487b787e9b4ecb39e3f85d9b26678375abf7e09441b9fc2c96b9. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8af785c1-d638-4511-8e3d-8c9ca360ee51.json and https://artists.proofprofile.net/proofs/artist/8af785c1-d638-4511-8e3d-8c9ca360ee51.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Minimalists Works By Reich, Riley, Andriessen And Gann
M is for Man, Music, Mozart: The Alphabet Song
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 0x4293d8b3da330e33cc90146a0986db0b4e382cb56f556ee37029656e8f1a2df7. 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/USNO19434202.
M is for Man, Music, Mozart: Instrumental I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a8837e1f1b54848994de1ebce33861bd8ee9836ab87c2baf7364af4410821e8. 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/USNO19434203.
M is for Man, Music, Mozart: Instrumental II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe876a914df7ce974b7a2ddcf278070195c36ae183a4cb88c652936cdbcb1c329. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/USNO19434205.
M is for Man, Music, Mozart: The Eisenstein Song
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbf07b02e48262b8798f187475eb4373d9609bbd11ad68159a2713d88079a07b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USNO19434208.