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 0x835ee6e9cfb0cfa0d51c5e6d903a1307bc00b4e646b98ad664ee3713526b611d. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6d6dfa03-b7cf-412c-8135-113fefd6ae3d.json and https://artists.proofprofile.net/proofs/artist/6d6dfa03-b7cf-412c-8135-113fefd6ae3d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Psalm 46-6 Motet de Heer de God der Legerscharen
't Voorbedachte Lied. Psalmcomposities voor Koor en Orgel, Vol. 4
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 0xd0ef4dc8624cdd296af2e9cd5215f5d5f6cb72f2c6a2886d474bf4aeee39d8fe. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900001 — a six-check JSON result.
Psalm 46-1 Koraal God Is een Toevlucht voor de Zijnen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37d7d29a1480f5c044d332c51fd272b03f9996c500728f6dafcbec31e3d50a0e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900002 — a six-check JSON result.
Psalm 32-4 Koraal Gij Zijt Mij Heer Ter Schuilplaats in Gevaren
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a657ecca03245b5b394b49e482ee804d2ca26cb19c5afb40d395c6fe879789. 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/NLQ2E1900008 — a six-check JSON result.
Psalm 32-6 Koraal Rechtvaardig Volk Verheft Uw Blijde Klanken
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f5ba940da2250bd11b0097e2b41931d3d4e2df8123d4ab5feed6c18b7052e4d. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/NLQ2E1900010 — a six-check JSON result.
Psalm 101-1 Aria 'K Zal van de Deugd der Milde Goedheid Zingen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01d2293a35d9e0c33440a8fd6335a54dc41196d62c71a12dc51705de12a0d83. 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/NLQ2E1900011 — a six-check JSON result.
Psalm 130-1 Arioso Uit Diepten van Ellenden
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe2741b2cd23053b52b0c0649da93ecbb369232a42ab68683221a4b34d26819d. 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/NLQ2E1900013 — a six-check JSON result.
Psalm 130-4 Koraal Hoopt Op Den Heer Gij Vromen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38a7eef8d61f8ab1c2f2ba4cef73da92958ae19d9bf84e0522eef72e46e1b6f8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900015 — a six-check JSON result.
Bedezang voor het Eten Koraal O Vader Die Al 't Leven Voedt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689545f9b01862aece8a7d5a3b5fc8a8d383b39bb3c0b0de412df6adcd4d7c79. 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/NLQ2E1900017 — a six-check JSON result.
Psalm 122-3 Aria Dat Vreed' en Aangename Rust
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ff62d0c3f8a6d197751a9c07ae9ec6d0291d7f3af47e8c3ac52f09f2903af7. 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/NLQ2E1900018 — a six-check JSON result.
Psalm 21-1 Koraalmotet O Heer de Koning Is Verheugd
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd020a81bd755ede58223a8d0f1a893f514808ef36929e8bbeddbe7d27f929d12. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900021 — a six-check JSON result.
Psalm 92-1 Koraal Laat Ons Den Rustdag Wijden
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b53abe0775726a2d6e8cea4507286bd77a4c2b51258bae8a2106e61253a9df. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900022 — a six-check JSON result.
Psalm 92-2 Koraal 'T Voegt Ons met Blijde Klanken
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe60d9d0b7542d7ac7772b75e4da0859310e5cfb97e14319115644924497e7020. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900024 — a six-check JSON result.
Psalm 100-1 Koraalmotet Juich Aarde Juicht Alom Den Heer
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf234e5d3a24ddbc0580b8614235d8dcf55c06bbb3e567322ba39f477b941ff18. 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/NLQ2E1900029 — a six-check JSON result.
Psalm 471-1 Koraalcanon Juicht O Volken Juicht
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b3425d3f712091f8e4d891e1444a3bae658a3b9cffb1b777457c24173e92da. 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/NLQ2E1900030 — a six-check JSON result.
Psalm 148-5 Motet Looft Looft met Waar' Erkentenis
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc25eaa30b2693a9e945a328750e697bf6f1dfd27a13576d3f7d2224f235ccb21. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900032 — a six-check JSON result.
Psalm 134-1 Motet Looft Looft Nu Aller Heren Heer
Zingt Den Heere een Nieuw Lied! Psalmcomposities voor Koor en Orgel, Vol. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f9b0f1bf38bb3cafdaa20b9e4d16d4ad1e34f86440c071801d12911d0cba04a. 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/NLVZ21681026 — a six-check JSON result.
Psalm 134-2 Koraal Heft Uwe Handen Naar Omhoog
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c1ccec03d735a2ed82e8e6f52088dd23791bb3980d33b747c3c416cfe7508e8. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/NLVZ21681028 — a six-check JSON result.
Psalm 134-3 Koraal Dat 'S Heeren Zegen Op U Daal
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e8812d3189f92202f9e12def1a207f698f328424b910f2c1ba9a82f926725d. 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/NLVZ21681030 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d99345284de35d2bc4634315dbd1ead92d4678f69a4c84d60589af87e63363. 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/NLVZ21681032 — a six-check JSON result.
Psalm 90-1 Gij Zijt O Heer van d'Allervroegste Jaren
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x394514c37535d0bcc43d074ab19e135b6d3d1ebd565ff718cb670d7f9898c38f. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLVZ21681033 — a six-check JSON result.