thumb|Gré Brouwenstijn (1968) Gré Brouwenstijn (born Gerda Demphina: 26 August 1915 in Den Helder – 14 December 1999 in Amsterdam) was a Dutch soprano singer whose stage career spanned from the early
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dea92e345837a230224644c9560dc5f158175278f7bdf7324f1a7ef59ca7f9e. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1d0a610-df69-4ba3-9f26-2f9dbd1159d9.json and https://artists.proofprofile.net/proofs/artist/b1d0a610-df69-4ba3-9f26-2f9dbd1159d9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Verdi: Don Carlos (Live Recordings 1958)
Die Walküre, WWV 86B / Act 1: "Wes Herd dies auch sei...Kühlende Labung gab mir"
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3727a310b2dfccd5a8b3763d8cce4271b683732c6acb44a643ed76707a9c60e. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBF076141602.
Die Walküre, WWV 86B / Act 1: "Ich weiß ein wildes Geschlecht"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc7307c5d34798d8ead2f4476fbb4c259726e5f97dce68c956e9e1f0c21ded42. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBF076141605.
Die Walküre, WWV 86B / Act 1: "Du bist der Lenz"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb657f8ced0cbd89c267427c16d3087610306a2cc01c34d986e109e0d473da9d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF076141610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5f7a35de9df8a0463f7ef284709f210f64f965b313cef0f002731ee9ab63516. 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/GBF076141613.
Die Walküre, WWV 86B / Act 2: "So ist es denn aus mit den ewigen Göttern"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18b01d930b5cbc540fe46c1759cbe207bf0499b91b9329eaf936ec6df2d6979d. 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/GBF076141617.
Die Walküre, WWV 86B / Act 2: "In wildem Leiden erwuchs er such selbst"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7247d8b70d121acc8f7d87ea6d7c10fb703c6402378aa632b2fefc68dd0ab129. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF076141618.
Die Walküre, WWV 86B / Act 2: "Was verlangst du?"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb60899bc722790da80114d2c563a716b8d6c07acab1551241c82fd4c3bf82f0f. 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/GBF076141619.
Die Walküre, WWV 86B / Act 2: "O sag, künde, was soll nun dein Kind?...So sah ich"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc90368cff0a761a5825cdb2acc0b3ce02b461381902af0ce9ce805f0b9fff6a. 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/GBF076141623.
Die Walküre, WWV 86B / Act 3: "Nach dem Tann lenkt sie das taumelnde Ross"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d75d255f2356f768be07a0b2118441912692adffdceb8b333ba5f157cfbd7e5. 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/GBF076141631.
Die Walküre, WWV 86B / Act 3: "So tatest du, was so gern zu tun ich begehrt"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45c8e1f5ac6c35e4eb0d91d4fa0ad5e1d488eb85e7af0313ffec18c9c1408c06. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBF076141639.
Die Walküre, WWV 86B / Act 3: "Wohl taugte dir nicht...Deinen leichten Sinn"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8210952efc584d2e1666ec1f1c72752788ee6e9c6d3c205b1baaf914da3b2f4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF076141640.
Die Walküre, WWV 86B / Act 3: "Leb wohl, du kühnes, herrliches Kind"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31124b560afa38c359849d0c62cd4af84993627eeb2d8f814b994ea804b8c06. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBF076141642.
Die Walküre, WWV 86B / Act 1: "Friedmund darf ich nicht heißen...Aus dem Wald trieb"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd870f4d44741c5dda6924e4d603271ad967b7bd79b33bee65d76f98ea0f20378. 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/GBF076141604.
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
Die Walküre, WWV 86B / Act 1: "Der Männer Sippe saß hier im Saal"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb480014595dbe0f3ef8411bfa7ec17f4b07c35bec9ff51d216aca1fb0cf0d3bd. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/GBF076141608.
Die Walküre, WWV 86B / Act 1: "Siegmund heiß ich und Siegmund bin ich"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3766a55c65911dd696107d9a386518a3778866b695e0ced28047568f0793885f. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/GBF076141612.
Die Walküre, WWV 86B / Act 2: "Kehrte der Vater nur heim"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c1b5e5f5d48bff32b298b70dcfe87c287b34c37ee5cc4d76f78e3058f74339c. 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/GBF076141627.
Die Walküre, WWV 86B / Act 3: "Nicht sehre dich Sorge um mich"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59da5b6da9778fb6056dffbfe689c0a4fb34dab4ae8db49e94674bc3131261aa. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/GBF076141633.
Die Walküre, WWV 86B / Act 3: "So fliehe denn eilig und fliehe allein!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6039c1a46128ea6b7b9585415d471cb6131426de64882166cba065c8379d15ee. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF076141634.
André Cluytens - Complete Stereo Orchestral Recordings, 1957-1966
Verdi: Les grands opéras I - La discothèque idéale de Diapason, Vol. 13
Paul van Kempen – Complete Philips Recordings
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1701d2207fb4431238b329a183a7a2c6b0632cc28ae0ec08c3437cd758dc99ee. 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/GBAYC9401155.
Symphony No. 9 in E Minor, Op. 95 "From the New World": II. Largo (opening)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb65d36fd6d93c208b300c8e8977d0dbcdd103ff1f6dec161bfcd154ce68d9ef. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYD8200533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x419806dce580ff0126f6b9dcd6a8c59d804937597967bd9ada26bddf5e568acf. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBAYC9101464.
Symphony No. 9 in E Minor, Op. 95, B. 178 "From the New World": IV. Allegro con fuoco - From "Asura's Wrath" on "CyberConnect2"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8019266fb1ca151bd08194eeb7baafd864671150ae4d8a8fd71725b194a6e7. 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/FRS181244634.
Beethoven: Symphony No. 9 in D Minor, Op. 125 "Choral": I. Allegro ma non troppo, un poco maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f2130e7cc2feec5bbff92ceb9b7b9cdeb405d759734a262023d7f13e33cf82. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ115707786.
Beethoven: Symphony No. 9 in D Minor, Op. 125 "Choral": II. Molto vivace - Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcf291145085984b58b88e5de4eb83a60c847d09f1369e4b7a562ff5fcc3e364. 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/FRZ115707787.
Beethoven: Symphony No. 9 in D Minor, Op. 125 "Choral": IV. Presto - "O Freunde, nicht diese Töne!" (Ode to Joy)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1993d93c06b5d24cbccd9cdae5f2913c8b93a258a0e7df843c0d931dafea321e. 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/FRZ115707789.
Beethoven: Symphony No. 9, Op. 125 "Choral"
Tannhäuser, WWV 70, IRW 48, Act I: "Ouverture"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d11e9d8927ffa8e708f5dd33931be6b59b791b88bda1a64ca97c69d052f0775. 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/ITE012112655.
Tannhäuser, WWV 70, IRW 48, Act I: "Geliebter, sag, wo weilt dein Sinn?" (Venus, Tannhäuser)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac6d4900e99595024587d09262e023eec1934bcb7c4fa7b3724a6b3bfb9243f. 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/ITE012112657.
Wagner: Der Ring des Nibelungen, WWV 86 (Live)
Wagner: Highlights from The Ring Cycle - Essential Music from Der Ring des Nibelungen with Ride of the Valkyries, Siegfried's Rhine Journey & More
Richard Wagner: Die Mastersinger von Nürnberg (Bayreuth 1956)
Beethoven, L. Van: Symphonies Nos. 8 and 9, "Choral" / Ah, Perfido! (Amsterdam Concertgebouw, Klemperer) (1951, 1956)