Benjamin Herman (London, 9 May 1968) is a Dutch jazz musician. He is best known as an alto saxophonist and as leader of the jazz band New Cool Collective. Herman also plays the C-melody saxophone and
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 0xe098fcde1c9f0058e9b4fa904999a2bac424f37d8e27c8473aa6e9c9656ba78b. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4b9ca328-b7dc-429e-bcc0-6f69e6476ae6.json and https://artists.proofprofile.net/proofs/artist/4b9ca328-b7dc-429e-bcc0-6f69e6476ae6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x90ea376dde531cdc5e0b2ef963862a8194ac96c2e7c1f676b09b7d1712e2039e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:59:33Z), 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/NLH212300148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d86c5b548e39a687e41085b44caf80c9174154b2ffe43bdc941a3a5009e51e0. 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/NLH212300149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6845332ed75244500d2e1ddfd01121c2b7ae3648bd2285aa5f82308beef42fb9. 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/NLH212200037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef40ba655d75864cacaf289178eb5f4950165b10062d23c58090277ac46352ac. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLH212200036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3321e55c86d6e8dcf98cb8efe97b424a24080a09fbc82a2f8e6c46dfd8f7245c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLH212200038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6def5d5bfbf4a79a1fbe71b2b6beb67b8dd3202d84fbe83dffc7229215a0ca. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T16:46:52Z), 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/NLH212200039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6287a1d21f43780ed57c1b0a5432ef17d42a8de302072b1d074a79e9316593c7. 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/NLH212200041.
Jan Douwe Kroeske presents: 2 Meter Sessions #1744 - Benjamin Herman
The City of Prague Philharmonic Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb075c3e0846c561c647425dbe2a2ef3d67333fc3e0329282edd33a5c3818e7c. 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/NLH211800038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4ec7c762d8a651036dedab87790b8c0bf9e2603b0b0c46b9ae891d2a3cda8eb. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:11:46Z), 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/NLH211800039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab25cb969129a4aca2956e9a0fd8fedb97dd92411b00ea64cc2eed8064f2e09e. 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/NLH211800040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a24c1a7ae54991c98be3ed5c037f9ed3d91b93035132e318210688fb879022b. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:27:16Z), 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/NLH211800041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeb5690e1ca23d669ed942e105bcf697f395f1e5bf9b4eff8654c195438ccc0e. 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/NLH211800043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78491cc81dcaab7a54fb234cc5b2b822424c9d99c4f9788fd2a6c78219db0845. 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/NLH211800044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34c836c0047c83a3a55a9bf2fb12aa2f6b5cac4dcddbd7651dca01b5b3ea26e2. 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/NLH211400950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1ca4d11d8f6bae7a5c0ab88e3da6938a94e291a431374297911403925c7859a. 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/NLH211400951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc32e4c77221a05aabfc567c8705f12ceba242bc33ce9c36d350b32dbec8ebd2d. 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/NLH211400952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb70746aa8cbfe635a631a414222460033266205c417fceb5defcd605c2945972. 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/NLH211400953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c399ad5c6f6853c31b2cbff7d0bb8bd405b0fcb0ba69a162188881c875de760. 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/NLH211400956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa80b8b8646e04d06eef701a106e222458a004972d2ad6399d2a7f4e8cfaa1825. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:27:32Z), 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/NLH211200748.
Hypochristmastreefuzz (Live at North Sea Jazz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616d517fef2de0fdbc1ad2e29217ddf4a983cb794d81637d0bb80865b9e2fab1. 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/NLH210900436.
Van der Grinten/Herman Quartet: Lost Languages in Sad Serenades & Jocular Jazz
The Van der Grinten/Herman Quartet: Psychodixie for C-Melody Saxophone
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03501c474bf48269a629c7f4be8a016b9838181c68a4222781805b4304c42298. 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/NLH212100033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca0ed0dfc7d265580187cf580d63123c7d39767278465ee7295a4555227122af. 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/NLH212100034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8768f88e58b13eb911a657e9b0928958e12440e383397e9f8b5e156fb347465e. 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/NLH212100036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf372ce23905662350f311722ae631218c56690cec01e3bac08fbfdce06bbf811. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/NLH212100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975d4674efa3ed589a1ece1e4e1cd68a28822cf7d1e356b45b1e2a9053a4d799. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLH212100018.