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 0xdc1fb43d60c03d1d72a7d946973a7c5e4c6c63481eace7c793ed27e0abb008ac. Chain 2 (Bitcoin): anchored in block 954689 (2026-06-21T10:35:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e29a8f7b-4b82-4c52-91fb-fad40c23f537.json and https://artists.proofprofile.net/proofs/artist/e29a8f7b-4b82-4c52-91fb-fad40c23f537.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 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 0x8b99d19b1baeb5e8da55c054874c5848e4573dcb9435f4e5e3ef13ba2d442c74. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRV770200229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x497417fb24eea35f97f7a734614a7e53bdc5d0ecbbb2d317bf809cfc25108b95. 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/FRV770400025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0299561f2c6f2b05a1fa7d473d131b8a657a6543ad6d159086a243581942b9dc. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/FRV770200217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebb651705520342ccb2c09e502e2114d2371b2cefa814504d4101078d94de80f. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/FRV770400177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5b94f37a95d4e156a5b60de86848f8aad2554a6bc57064103b12e77b18d2ece. 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/FRV770200276.
Cantata BWV 202 "Welcher nur, betrübte Schatten": Sich üben im Lieben
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe17fb1559dcab9f2a6188e3414a1a7db38c64ae95ba2aef9756dce16753e6535. 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/FRV770600204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc97d8b47335b4a4d504b25199fa8c59801e9ce50485ecb43660c20c694af1210. 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/FRV770400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x587ec4507ccd92688cb38a17ffe8b0c42c4cdff876eb14c4f3b585f4f7d2b1c5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRV770600211.
Magnificat in D Major, BWV 243: Quia respexit... Omnes generationes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2dc42845091218a6c0fd69c61c9246437defcf45bfe30e61f0db0d2bc034537. 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/FRV770200222.
Regina Coeli in C Major, K. 108: Ora Pro Nobis Deum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc46bb5d41cb02ad55bc5b96f888ea4641aa7d2a08946aa25a04660d2bc033054. 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/FRV770300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b1826cfdb593cbc6f284204ff7a4ca10941c130687c1b8a85432889c8f22a89. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/FRV770200223.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7e9975a0b1f11f9df7409fec5db406666147680ec79ddf55a81e1c67ab24599. 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/FRV770200218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68b4d9a75abe3d34087b40e5c53e2758c794c1044e5fcac54c99f6c92f1af68a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRV770600205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18ba964bb7d03bfaf4869c9303ee4d9f2f4e51075438be32f961b3b40dfc19b2. 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/FRV770300009.
Le cantique de la vierge Marie, Magnificat
Chorale de la Maison des Etudiants Catholiques de Lyon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10995f6630acbd4ba4a995289c07b0785152dd5b6db441b7bb8b132276bb8632. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/FRV779800018.