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 0x7939bb4663992fb097e284cebdbaa77c30abca6bbb45cbecd06938b991962763. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b7ad4dac-462a-4867-b9bb-e247fba09834.json and https://artists.proofprofile.net/proofs/artist/b7ad4dac-462a-4867-b9bb-e247fba09834.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mahler: Symphony No. 5: IV. Adagietto. Sehr langsam (Arr. Falk for Piano)
Mozart: Ave verum corpus, K. 618 (Arr. Falk for Piano)
J.S. Bach: Oster-Oratorium, BWV 249: 1. Sinfonia (Arr. Falk for Piano)
Oster-Oratorium, BWV 249: 1. Sinfonia (Arr. Falk for Piano)
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 0x98e742eaadb6e8b0adb6534d2336f92b60e8ea8db13cfbeb997f7fe915b66837. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/SE5ZV2406701.
Schubert: 4 Impromptus, Op. 90, D. 899: No. 3 in G-Flat Major. Andante
4 Impromptus, Op. 90, D. 899: No. 3 in G-Flat Major. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x331711652a791caf9f55b087e5f77563ad692bad77a73318cccd639aae1fb9f0. 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/SE5ZV2405201.
Mozart: Fantasia No. 3 in D minor, K. 397
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f8255248b9f3477da22d94f132cf36c43ca4582035b9c1bbed6485f6b14a45. 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/SE5ZV2403601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a269a36e1dea44510a9157fff95f931f83b863f9bfe5e154c79bcfba9a34eb2. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/SE5ZV2347901.
Piano Sonata No. 16 in C Major, K. 545 “Sonata facile” - II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01e1566f9584bbfd8603b929076d32d39109fb27b105e188f42c887cb683d647. 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/SE5ZV2342402.
Piano Sonata No. 8 in C Minor, Op. 13 Pathétique - II. Adagio cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3848da4f9a7cad4f6cd7c6a247444655a08962e07fc9d60c2d679eb1d7363864. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SE5ZV2341101.
Nocturnes, Op. 15: No. 2 in F-Sharp Major (Larghetto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece40311795951062b87cba6ff6ecf771bbe0bf1e8d02425a292fcd01c6162ec. Chain 2 (Bitcoin): anchored in block 958041 (2026-07-14T18:13:17Z), 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/SE5ZV2338301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xece40311795951062b87cba6ff6ecf771bbe0bf1e8d02425a292fcd01c6162ec. 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/SE5ZV2338301.
Chopin: Nocturnes, Op. 15: No. 1 in F Major (Andante cantabile)
Nocturnes, Op. 15: No. 1 in F Major (Andante cantabile)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162c7589f3987e842dff8d8b4145127e4bd22ac847760275568c4d453b0c5315. 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/SE5ZV2335501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f43b79cb9cc8b184b3375280fa98595d156f73302c03d8c5b7fa548ef44c88. 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/SE5ZV2333901.
Chopin: Nocturnes, Op. 9: No. 1 in B-Flat Minor (Larghetto)
Nocturnes, Op. 9: No. 1 in B-Flat Minor (Larghetto)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f7acfb3c892424913ae5c096b25488ca4ec0de023fd9cb9737fd86f816b305. 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/SE5ZV2324101.
Chopin: Nocturnes, Op. 9: No. 2 in E-Flat Major (Andante)
Nocturnes, Op. 9: No. 2 in E-Flat Major (Andante)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0e005384a90fd9ad947f84f04b23e784c5c08db2c2d6b04fb9e59b315687752. 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/SE5ZV2323401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06a19b12687f52d5559a7e95c5d6ab69a806e6a11b1728c809d147049c0dc981. 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/SE5ZV2321701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x572a3162868e23c87bf4e949805ef4a33342f6a867377ed3867e5d14739bb5f1. 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/SE5ZV2318003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e4dc1e493b19da2a888e5040107d247eb44910c25efa593479fee59d7b49e06. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/SE5ZV2317501.