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 0xf79482969ee648a7e457d4ca54f0f06740cb2119c6a85dc276c0f2573d689330. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fdf41775-6245-4e4c-adb1-5df781c0ae43.json and https://artists.proofprofile.net/proofs/artist/fdf41775-6245-4e4c-adb1-5df781c0ae43.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Musical Highlights from the Low Countries: Works by Jean de Castro, Johannes Tourout, Giaches de Wert, Orlando di Lasso, etc.
The Feast of the Swan: A Renaissance Brotherhood at Table
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 0x1400291609a8625ae143ea0f1e178a02c60c87ffae4fa119fd92f3eb03f2e0e7. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLSB72400207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f420a1a684fc5b8f88f252ec267b0d65f859ed7675b7971f545b5d44c41bcb8. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/NLSB72400210.
Parle qui veut: Moralizing songs of the Middle Ages
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34429e1959c942078739267e0974f3c03820ccc5cde3efeb156dbabcf0d37143. 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/GBASH1752901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d260633f5d642a06bad57408b379898656059c2487079253e6e777fded30c1b. 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/GBASH1752902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe9cb3c04647d84922ba020a83443d65ea679126795a3d1fca44d9d70b1af834. 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/GBASH1752903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf9bf8fde69cbb582ffbe01c30f0d8d5a2f22d846e73303b056ad74c76afa188. 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/GBASH1752904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04c6f14c84c67abc83f33c2228aea63dd92959d7d4d326e6bc15271098788815. 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/GBASH1752905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6761c4cdab72f389695c77025bf3e223bbe900d24dc76b204abd4e76ef1979e9. 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/GBASH1752906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9f688a0db9461be32eb695e4f33af6f1cab51df1bbf361eb89a1c7fcb92db70. 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/GBASH1752907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77a95c2103de3b111b6c059771c04ddca952ae418d5db7f50d0a7f29ceaff09e. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/GBASH1752908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb78457b3aef264e0c72f0a4852d7610fa43a9e31be32a14c7ec025e32d4190f4. 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/GBASH1752909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2592a7e1c079b6b5ae0e745a0f130ed9dbaec237f73c34518971710a0ec30b6f. 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/GBASH1752912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe0da06e02731c0f8c832d49dc52249fda0eb64d5506ba6c38ddd4d20b6994e8. 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/FRZDG1801288.
Firenze 1350, un jardin médiéval florentin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b66370fa96a0a42ff992721b24584964c60e03f48eb690bad5f10be11daeb9. 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/FRZDG1901393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f78a883e0c17ba5ec534ede21a45161e204d677cb4b538c68173564643438b0. 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/FRZDG1901396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84855e1eb24f682a6141093586e733474a3515af1e0e3fd0515d8a341facf63. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/FRZDG1901403.
Le cueur vous demeure: Leuven Chansonnier, Vol. 3 & 4
Leuven Chansonnier: No. 29, Le corps s'en va et le cueur vous demeure
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4d51fa375eaf2f6181e96206864c6345a2b308fcd86fd1b85d257bd075deef9. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEE022414601.
Leuven Chansonnier: No. 38, Ha, cueur perdu et desole - Instrumental Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87fd7e567a0918afea59a2e7387199551246b611a4318976ba38d79f19302a4a. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/BEE022414602.
Leuven Chansonnier: No. 16, De touz biens plaine est ma maistresse
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bdc5dccbb42c0e5fb76b1ead5f59906204cbe21c5d2e2b61c3d247f90b12ddd. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/BEE022414603.
Leuven Chansonnier: No. 15, Puis qu'a vous servir me suis mis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0645a8845eb3d8fc93a9777a8de4bc5aa8138ba8873aba028c7049f2cb729375. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEE022414604.
Leuven Chansonnier: No. 23, Au travail suis que peu de gens croiroient
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3eae9b611f173773fce70ea53f7bbd1608863acfe0462b710e0d49632e6b0918. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/BEE022414606.
Leuven Chansonnier: No. 20, Comme femme desconfortee - Instrumental Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4efd05fb2c3a2a1ccdc5658ee470a0f798a0556d3114c49d2d75460e261b10e5. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BEE022414608.
Leuven Chansonnier: No. 6, La despourveue et la bannye
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556371bf6f63794272296650b966642bfce8056d3effce91d6498875517b12a0. 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/BEE022414609.
Leuven Chansonnier: No. 27, Tout a par moy affin qu’on ne me voye
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x082d461fb1313fa81df5788acc662f86409183d735e18df452b9ba198e79304d. 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/BEE022414612.
Ou Beau Chastel: Leuven Chansonnier, Vol. 2
Leuven Chansonnier: No. 4. Le souvenir de vous me tue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4af4cd5d18570f6f5d64cff30da30614e6da00f1d72935b362bd751713d968b5. 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/BEE022210907.
Leuven Chansonnier: No. 1. Ave Regina caelorum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d04926ce6331bb0d9139c9077d4ffabed528d6801a7d7082a8fc447b4a53c6. 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/BEE022210912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2080f201a4a8141f32aff4daade5ec70ec515e54618c5b53b990878f18c5e9e. 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/BEE021805401.