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 0x3a9e9aebd2b82f876828d28a51196f4e31f29505633fbbe1476db8b59d30a13d. Chain 2 (Bitcoin): anchored in block 953915 (2026-06-16T08:36:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/19fec23c-79f1-4ce6-b185-fd483e88192b.json and https://artists.proofprofile.net/proofs/artist/19fec23c-79f1-4ce6-b185-fd483e88192b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concert in D Major for violin, piano and string quartet, Op. 21: I. Décidé
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 0xc163af8e3e735a22a4092eca011c574d98f2018a1b4fa626a0ceef37d1722acd. 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/NLE422435701.
Concert in D Major for violin, piano and string quartet, Op. 21: II. Sicilienne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32d3bbfc78c8e6dc144d4f254bdb2b966280141f51a545e760868769397c361a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLE422435702.
Concert in D Major for violin, piano and string quartet, Op. 21: III. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165e52fc37a11791d7148fee53c63f88caaad7f4dedfb89ca6806fd300737dd2. 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/NLE422435703.
Concert in D Major for violin, piano and string quartet, Op. 21: IV. Final
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdca7bb5fe6a558d8f69cf8c045cac1d2ea10fb3fabdec047d4eb491b82c90fe4. 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/NLE422435704.
Poème for violin, piano and string quartet, Op. 25
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06e01fdd472a0feaa02ca509645cad690f3437fab3bf5ccfe7808ef677e4d076. 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/NLE422435705.
Les temps des lilas (Arr. for Cello & Piano by Emmanuel Touchard)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a19dc161c5fb92518e1213247d4946323c6c948cb48bc0abb3147e9354304f. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLE422435706.
Les temps du lilas (Arr. for Voice & Piano by Emmanuel Touchard)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb294dc273bac2007a48cfc2cbcf1d0ed28ff10d85ad49fd74eb4679348ef589d. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/NLE422435707.