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 0xf348cdb854e9ba011516d9812bf0283410d88c5cbe096f79db77a8b78cfe95bb. Chain 2 (Bitcoin): anchored in block 954063 (2026-06-17T07:49:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/473a309d-e56d-462b-a47b-3829f366a968.json and https://artists.proofprofile.net/proofs/artist/473a309d-e56d-462b-a47b-3829f366a968.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Les Pêcheurs de perles, WD 13, Act I: Seule au milieu de nous
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 0x7d1dca8704382a4206ee2969eafeb86229b548a8381e524dfe03cd2c3ad081e7. 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/NLE421702609 — a six-check JSON result.
Les Pêcheurs de perles, WD 13, Act I: Le ciel est bleu!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275fd364ee9395450f60f518245f26b8aea36be73d2fd26d29a9bef328bca61a. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLE421702612 — a six-check JSON result.
Les Pêcheurs de perles, WD 13, Act II: L'ombre descend des cieux!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b100dd42e230a10bf7de71df255c31d6ba299b8239b996506bb8dd39ca39d1. 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/NLE421702614 — a six-check JSON result.
Les Pêcheurs de perles, WD 13, Act II: Ah ! Revenez à la raison
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa58325f293146b1beaf923b6731fb9f6535543628286161be47e193a619871. 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/NLE421702618 — a six-check JSON result.
Les Pêcheurs de perles, WD 13, Act III: Entends au loin ce bruit de fête!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8911b9809b32902ea60c003344d4053823a84ba6a1fb7760f8a0fe19281e3672. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE421702622 — a six-check JSON result.
Les Pêcheurs de perles, WD 13, Act III: Sombres divinités
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e7dba6807e24268e1802e84da18dec98c5dc4971b15b790a953102b16d3138. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE421702624 — a six-check JSON result.
Les Pêcheurs de perles, WD 13, Act III: Ô lumière sainte, ô divine étreinte
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4efa9977cd1de20cd1d7884b198a8c49e22e43272fccd2bbba1867a0708925. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/NLE421702625 — a six-check JSON result.
Les Pêcheurs de perles, WD 13, Act III: Le jour enfin perce la nue!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a4c8c38f679a37f140f163545431adac69a4f69a0007293977ed4738bdf0996. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLE421702626 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14cf41ce16c97e2d2e6cdb6c694d868654e7979cb8d002e1c68f8fd588ddf169. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR9W12033451 — a six-check JSON result.
De profundis, LWV 62: I. De profundis clamavi ad te, domine
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd25a5d7f0b7232412f1f86ac35513470812627795ac89498eb00b5c0b3cd7efd. 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/FR9W12033458 — a six-check JSON result.