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 0x5769e55fbb9ce352bd919595e54b6b8b70e94403832a69f6266e44e4391d3ca1. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bc64b1ae-964b-4574-a424-16452d16d790.json and https://artists.proofprofile.net/proofs/artist/bc64b1ae-964b-4574-a424-16452d16d790.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Four Seasons, Concerto No. 4, Op. 8, Rv 297 "Winter": II. Largo in E-Flat Major (Arr. for Left Hand 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea3b864c915fb7daf45ea7293594d752e82190ce64d802c80df17ccbca22b059. Chain 2 (Bitcoin): anchored in block 958063 (2026-07-14T21:07:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZQ5B2100015.
16 Waltzes, Op. 39: No. 15 in A-Flat Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa338a327c29bf480390aadd9551bcfa0d42e4dac701065a403579514d38b766d. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/QZQ5B2100021.
5 Preludes, Op. 16: No. 4 in E-Flat Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabb30a5a74b17b49a9aa3f45e8afe36f31605139550e4614fd065109c20d7d67. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZQ5B2100019.
24 Preludes, Op. 11: No. 21 in B-Flat Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x172ad33c8f83052b4693a8dec010ba35bca66c32d23ffac2c4da496be234e56c. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QZQ5B2100018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9c79e5e443468827135a5209f636e206f3245f0c538a960700838738095183f. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZQ5B2100017.
Piano Sonata No. 2 in B-Flat Minor, Op. 35: III. Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6679c68f6a34798ac51b9f5affff7e9fc76043e7c11d09481fc403805b3fe1ba. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZQ5B2100029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7c6b232fb29546d8ba76d4322c1475160828e8806b11be6c472e1389a81f8f4. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZQ5B2100033.
Nocturne for Dogs: The Stillness of Night
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e6d5ddf85aa10d5657e552b5af636ec978e6cfb0499309978210737e7e0b96. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZQ5B2100020.
Suite No. 4 in D Minor, HWV 437: IV. Sarabande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7d20e47f4a75441bf1c3b188382f5ad7c2405322d7897acf0b0efee21c5ba98. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QZQ5B2100035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2242ab4e65292f466eef07c18dabc91f867bbfe35cedbdb1e22e7316ed17ba2a. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZQ5B2100036.
7 Gypsy Songs: Op. 55: IV. Songs My Mother Taught Me
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b70697fe8c5c70d3052dcefeca9409b39ad704b182061d427f52313bf7d558. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZQ5B2100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0768d082a3bb93157f0b0f64d082103dd9c51d68846089ecff5bf1fc9a867095. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/QZQ5B2100038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00974e9e216c7df6b71ca9b4ab0465b32dd86a67f56c4d5a3f8998be096692b3. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZQ5B2100034.
Kinderszenen Op. 15: I. Von fremden Ländern und Menschen
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155882223fece12213fbbc6dfd34f46059ea65549913d426c82a9dacbbf62d72. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T01:56:33Z), 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/QZQ5B2100022.
Kinderszenen Op. 15: XII. Kind im einschlummern
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce2823fdaeffcc6205e1d3c2fd40cd8cc439c8801bf5fb7ad0453601a0224047. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/QZQ5B2100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ca7efed7765296f2ae95c81a62acff59b835fe2a02df6cbcdaae8f19a3a2597. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/QZQ5B2100032.
Keyboard Sonata in B Minor, WQ 55: III. Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32cd7823a9bda1e310b87572477c88744f007bcc1fcfe52cd6fef3141019efe4. Chain 2 (Bitcoin): anchored in block 958697 (2026-07-19T07:58:24Z), 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/QZQ5B2100024.
Arabeske No. 1 in B Minor: Andante con moto (Arr. for Left Hand)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x668364e88f465949ef0068381667157eec7c45876021fd7d723b685e0c5d7255. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZQ5B2100016.