thumb|Alphons Diepenbrock. Alphonsus Johannes Maria Diepenbrock (2 September 1862 in Amsterdam – 5 April 1921) was a Dutch composer, essayist and classicist. Life and work thumb|Diepenbrock reading
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 0xf3ef3c43b8cd38b5e341481b55e8eacb7c91e7e722611f5e997091946d7bb5b9. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f0f4a12e-95e9-4b27-939f-cf2455440229.json and https://artists.proofprofile.net/proofs/artist/f0f4a12e-95e9-4b27-939f-cf2455440229.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0xd8eeb62d98062495cb80e979f8b78f8dbb6bca11430156cfc27066bf6c8b92a3. 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/DEB201492701 — a six-check JSON result.
Marsyas Suite: II. Entr'acte: Wandering through the forest
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbb9cf4b40fd542b637ddc8937f520267c7f26d5db9c0dbf2e641c972f1884d7. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/DEB201492707 — a six-check JSON result.
Diepenbrock: Anniversary Edition, Vol. 1: Stage Works and Orchestral Works
Diepenbrock: Orchestral Works and Symphonic Songs
Alphons Diepenbrock: Symphonic Suite Elektra - Hymne an die Nacht 'Gehoben ist der Stein' - Overture 'De Vogels'
Pijper: Piano Concerto; Henkemans: Violin Concerto
Diepenbrock: Anniversary Edition, Vol. 7: Works for Choir a cappella
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x870a3e217e028064ba2ce5b95d6bd1bfefe4cd41841d4eb5975acce0a6199973. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/NLQ661200138 — a six-check JSON result.
Queen Elisabeth Competition - Singing 2000 (Live)
Diepenbrock: Anniversary Edition, Vol. 6: Songs 2
Diepenbrock: Anniversary Edition, Vol. 5: Songs 1
Diepenbrock: Anniversary Edition, Vol. 3: Orchestrated Songs
Diepenbrock: Anniversary Edition, Vol. 2: Symphonic Songs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0990d888c8e8b288c9f236f6216debed5433abe2d3e2b543462787a147fc49c7. 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/NLHR51004606 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc036de911fee2d37b53fc0b3984185ebf98abe0e080b514283ff4cf743295e48. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLHR51004609 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c68b887fcaf56ed0345c053684c7cb69a7a639de7b43bf4eb92e0b7d73986c7. 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/NLHR51004610 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde987ae0acbd9b438ff0c5d24a6e920372aefb1467074da3230c6ee6389d2124. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLHR51004614 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc968cd4c4c6f5cdbeedd7d15dd678bef97e4d871f83fe315f83fe917fa79c467. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/NLHR51004615 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92564cca0bcff2e7050ca29c5c4debdb1d8a179643775d659a77bd978eb77ad. 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/NLHR51004617 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e45bd80f13839015d6eb36542b75a3f557084ee843a960dfd5804a9d1d71fe. Chain 2 (Bitcoin): anchored in block 960199 (2026-07-30T02:30:29Z), 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/NLHR51004621 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9154a59d9711884d5ddb8c63fe464b2fdd2f43aa745b4d663a05f27827bfe2. 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/NLHR51004625 — a six-check JSON result.
Great God of Love. Geistliche und weltliche Meisterwerke der Chormusik aus vier Jahrhunderten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5ffaa24127ec7b8bd696d0fa934249419da097fea3f23ac37ba5ee4efa4cf86. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ATH071153004 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37e7424b0616b4abbaa866b61119af589ab82cd46dbcb291e3c870e2d0cf75fd. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/ATH071153005 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36a8ad2a1b9bc777c3aa83df341bc173325652bb146f3b0036cfeadddf50f4ab. Chain 2 (Bitcoin): anchored in block 960218 (2026-07-30T06:57:05Z), 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/ATH071153007 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc42d60c3201744f30935800accd38d1c1ac6de234f46e63a51632359fbdaa3a. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/ATH071153014 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb88e66f63f2d1120cf18a5ccc40d71c891f5f9b16b5d3d5508edbd484b478aa. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/GBF075211390 — a six-check JSON result.
6 Romances, Op. 6: VI. Nur wer die Sehnsucht kennt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a8eb1644bec1caff4fed70b0b0b154835d424b2f88b627c899fa846a7f705d. 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/FRZ141022100 — a six-check JSON result.
Andante Con Variationi, On W.A. Mozarts 'Ein Mädchen Oder Weibchen', Op. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1be5d25a24cdb9299b746d59da7335d3e0a6f991caff7c98f5232faa44d0d1f. 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/NL3UC2000654 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3219c19ad7dc026e9c42d32fa799ca9564f1a05c7cd8e3ed153290978b1f785. 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/QM7281450494 — a six-check JSON result.
Mahler 7 / Diepenbrock: Im grossen Schweigen
Schäfer, Diepenbrock and Van den Sigtenhorst Meyer
Eduard Van Beinum: Original Masters 1948-1953