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 0x030c10122e2f06b975fd4e567ee12f5f47dc31ca8c6f0c28d9a6227fa1983fe6. Chain 2 (Bitcoin): anchored in block 954553 (2026-06-20T11:51:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ac234c0e-bf40-412a-a299-e9fe02b8ca20.json and https://artists.proofprofile.net/proofs/artist/ac234c0e-bf40-412a-a299-e9fe02b8ca20.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xf7980f1f21683b6fca1fd835b22f685cf2dd0d93e67480f7f16bf1dded336819. 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/NLQ2E1700015.
Psalm 32-4 Koraal Gij Zijt Mij Heer Ter Schuilplaats in Gevaren
't Voorbedachte Lied. Psalmcomposities voor Koor en Orgel, Vol. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a657ecca03245b5b394b49e482ee804d2ca26cb19c5afb40d395c6fe879789. 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/NLQ2E1900008.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900011.
Psalm 130-1 Arioso Uit Diepten van Ellenden
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe2741b2cd23053b52b0c0649da93ecbb369232a42ab68683221a4b34d26819d. 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/NLQ2E1900013.
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 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/NLQ2E1900017.
Psalm 122-3 Aria Dat Vreed' en Aangename Rust
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56ff62d0c3f8a6d197751a9c07ae9ec6d0291d7f3af47e8c3ac52f09f2903af7. 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/NLQ2E1900018.
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 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/NLQ2E1900029.
Psalm 471-1 Koraalcanon Juicht O Volken Juicht
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21b3425d3f712091f8e4d891e1444a3bae658a3b9cffb1b777457c24173e92da. 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/NLQ2E1900030.
Psalm 46-6 Motet de Heer de God der Legerscharen
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900001.
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
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900002.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900010.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900015.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900021.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900022.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900024.
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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLQ2E1900032.