Marjon Strijk is a Dutch classical soprano. She is focused on Renaissance and Baroque music. She has recorded Bach cantatas with the Holland Boys Choir, conducted by Pieter Jan Leusink. Career Stri
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 0xf581a028dfef81f60ffa09ea7d237cc64536734c744cd95388c96d2b0266a37e. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a8cb6aed-0a49-4b11-b82c-91b96a8ed57b.json and https://artists.proofprofile.net/proofs/artist/a8cb6aed-0a49-4b11-b82c-91b96a8ed57b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
J.S. Bach: Complete Sacred Cantatas Vol. 10, BWV 181-200
Himmelskönig, sei willkommen, BWV 182: II. Coro. Himmelskönig, sei willkommen
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 0x14f9f7abd5319022b502fff8a53a7c2aae492d2e9e6d76b319176000f206dfb1. 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/NLY331307674.
J.S. Bach: Complete Sacred Cantatas Vol. 09, BWV 161-180
J.S. Bach: Complete Sacred Cantatas Vol. 08, BWV 141-160
Herz und Mund und Tat und Leben, BWV 147, Prima Parte: I. Coro. Herz und Mund und Tat und Leben
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2441cd22a234d0da0441aacd2fdc21f95cb4551dc748a8e66c2223a49c4b2ef1. 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/NLY331307465.
Herz und Mund und Tat und Leben, BWV 147, Seconda Parte: X. Choral. Jesu bleibet meine Freude (Coro)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3f33d3d8403aaa4a105e96480e74fa73faf08613faf0a38bf88dfc97a49cbf2. 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/NLY331307474.
J.S. Bach: Complete Sacred Cantatas Vol. 07, BWV 121-140
J.S. Bach: Complete Sacred Cantatas Vol. 06, BWV 101-120
J.S. Bach: Complete Sacred Cantatas Vol. 05, BWV 81-100
J.S. Bach: Complete Sacred Cantatas Vol. 04, BWV 61-80
J.S. Bach: Complete Sacred Cantatas Vol. 03, BWV 41-60
Jesu, nun sei gepreiset, BWV 41: I. Coro. Jesu, nun sei gepreiset
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe8dc91be29582c3f626168bdfa334c2f9294cfbe2070f4c093ae2459b538a75. 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/NLY331306813.
J.S. Bach: Complete Sacred Cantatas Vol. 02, BWV 21-40
Ich hatte viel Bekümmernis, BWV 21, Prima Parte: II. Coro. Ich hatte viel Bekümmernis
Holland Boys Choir, Netherlands Bach Collegium & Pieter Jan Leusink
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc04751e6fa34cc240f43cb3e9085d7c6999ea7091b954e43986313654191ef. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/NLY331306677.
J.S. Bach: Complete Sacred Cantatas Vol. 01, BWV 1-20
Wie schön leuchtet der Morgenstern, BWV 1: I. Coro. Wie schön leuchtet der Morgenstern
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6cba69397a5d0146e558dfc354b9adf1c024dba8d07d2024cd4b102d920a1b9. 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/NLY331306556.
Christ lag in Todesbanden, BWV 4: II. Coro Versus I. Christ lag in Todesbanden
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e7767f580e43f6e907ae803cce69cb95f7ed11c9b4b968fe1c4ef441bd0fb3. 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/NLY331306575.
Christ lag in Todesbanden, BWV 4: III. Duetto, Versus II. Den Tod niemand zwingen kunnt (Soprano, Alto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88d7a335325bd740cc3e708ddab5a7a390c7b34e3035579b49104fcf053b2a39. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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/NLY331306576.
Christ lag in Todesbanden, BWV 4: IV. Aria Versus III. Jesus Christus, Gottes Sohn (Tenore)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9ba04523910fced02b6295495ddd61a6a991ddb0009e8a526878c379174b2ec. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/NLY331306577.
Christ lag in Todesbanden, BWV 4: V. Coro, Versus IV. Es war ein wunderlicher Krieg
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93459aa263a7cbe0f4bab94fb1aeb020fc521e97d1366d5c3ac47f06ca0eab20. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLY331306578.
Christ lag in Todesbanden, BWV 4: VI. Aria, Versus V. Hier ist das rechte Osterlamm (Basso)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc953639c3b8db8bfeb305c87e981e07e248a364f5c8a14ece92926aa12cfba40. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331306579.
Christ lag in Todesbanden, BWV 4: VII. Duetto, Versus VI. So feiern wir das hohe Fest (Soprano, Tenore)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2e355f97f99b79d2c54746f67822583fdcbbaf9a0532364363dcd5b1ba8bcb8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331306580.
Wo soll ich fliehen hin, BWV 5: I. Coro. Wo soll ich fliehen hin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984eaaa7b19b65b55ba60b9b8b7f18c4630a783353e4eb81707b3a8eff93aaab. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLY331306582.
Johannespassion, BWV 245, Pt. 1: Derselbige Jünger (Evangelist, Maid, Peter, Jesus, Servant)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce721bbb4169b7e1828af5acc6cd9c8be87fa5a65040670f355d592c9f20021c. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/NLA460912530.
Matthäus-Passion, BWV 244, Pt. 2: No. 9, Petrus aber saβ drauβen im Palast (Evangelist, Petrus, Ancillae 1, 2) - Chorus, Wahrlich, du bist auch einer von denen (Chorus 2) - Recitative, Da hub
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4efc8f30937bed22ee4c74365c42a2f94924690e51a9cd72b5de8b1e23704242. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460911600.
Matthäus-Passion, BWV 244, Pt. 2: No. 16, Auf das Fest aber hatte der Landpfleger … Barrabam! (Evangelist, Pilatus, Uxor Pilati, Chorus 1, Chorus 2) - Chorus, Lass ihn kreuzigen! (Chorus 1, C
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb579a5bea75805b602957cdf840dd07d1c389d6572003e22b04e8328fa0cd3ee. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/NLA460911607.