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 0xcf636570660a745e84b22a050976a2e4829e658c9ce897693124f11599a833ec. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/244d2f3b-782a-4fff-b012-eb4a34fb6edd.json and https://artists.proofprofile.net/proofs/artist/244d2f3b-782a-4fff-b012-eb4a34fb6edd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Eclipse: Piano works by Tchaikovsky, Rimsky-Korsakov, Rachmaninoff and Medtner
6 Pieces, Op. 51: Valse Sentimentale, Op. 51, No. 6
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 0xef87e5a21a66cc8a69bf44e3d254d62995dedee785d5d9e8bfcaac084e40cf0d. 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/CH6542271694.
Preludes, Op. 23: Prelude, Op. 23 in D Major, No. 4, Andante Cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30653aa32ccc3860fe93c72d45227fd360bfa56cf368780e244aca68acbc7643. 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/CH6542271692.
Preludes, Op. 23: Prelude, Op. 23 in C Minor, No. 7, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4835d891f5b34aa290ea54c3dfce557d180e802c03baa66a1c704ff74584153c. 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/CH6542271695.
Forgotten Melodies I, Op. 38: Canzona Serenata, Op. 38, No. 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23e8d686d826bda7f19ce8d2db8ef75951b098f2d3ee5bc75714c44fc699a0b. 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/CH6542271691.
6 Pieces, Op. 19: Nocturno, Op. 19, No. 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x314c49c8b3442382bb916dabf2bc82ed528df6e7d2fd6311a5dbb23d038d7f47. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/CH6542271693.
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
Pesenka, Inr 90: Little Song, in Dorian Mode
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180802bd6af3358460783fca32a409b8cd1a9a2ea0b2e80c2bc487bd7d240c3d. 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/DEPI82308918.
2 Piano Pieces, Op. 38: Prelude-Impromptu, Op. 38, No. 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dc448c44924905fdfde621e3df8d729281edb8082e40fcb9769baccc34a1fcf. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/CH6542271697.
2 Piano Pieces, Op. 38: Mazurka, Op. 38, No. 2
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cee89322935774c2603c711d020d7b1da1b08726e4b0213a715f2abb23a5457. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/CH6542271690.
Preludes, Op. 32: Prelude in G-Sharp Minor, Op. 32, No. 12, Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1110b7b7d9b7dbee6882ad90f403c3ca02e589f7f96cbc3d43b0233ad8417b2e. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/CH6542271750.
Preludes, Op. 23: Prelude in E-Flat Major, Op. 23, No. 6, Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13e9b9b14d16f7d1328a9a7a329c6b40a8d40c8442781bf7c4212a5c109261ea. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/CH6542271699.