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 0x27605ea6ab3ad49d52c8cc3a01b3451c85024aa1afd9a5c47a0c1bcefdb5c653. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5bba05fd-9fa1-4e53-958a-5dc13dfde4db.json and https://artists.proofprofile.net/proofs/artist/5bba05fd-9fa1-4e53-958a-5dc13dfde4db.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0xfdb3d3a85543f101a76538740f976a01ceb77b3b7cef513807a256fdd3530796. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUW61100030 — a six-check JSON result.
The Sussex Mummers' Christmas Carol (version for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d1b565be658ab0bf9bbf886286adcaf7177ef0e6f15f1a39637e888a8d18274. 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/USUW61100031 — a six-check JSON result.
Ding Dong! Merrily on High - Herz und Mund und Tat und Leben, BWV 147: Jesu, bleibet meine Freude (arr. C.M. Taylor for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x792bc2924a538a8b6a92b1c32722d81c9c83eaf68b8ceb7a46802006d5bc5eb0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUW61100032 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc156a24c43cdd0bcc5f1d688ccb09de639215a11179b88645497da859d81088f. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUW61100033 — a six-check JSON result.
The Christmas Song, "Chestnuts Roasting On An Open Fire" (arr. J. Biegel for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264a6a3ed4e91000515124eac454d68349c1c3e5f8d2e0741aa13f6ef72d1cc5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUW61100034 — a six-check JSON result.
Fetes de Noel (Svyatki), Op. 41: No. 3. Chanteurs
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4dbf1e8d22da6742ceae2b693b630169f60e211ac0685293863f0c054aae03. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USUW61100035 — a six-check JSON result.
The Nutcracker, Op. 71 (arr. for piano): III. Dance of the Sugar-plum Fairy
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924ec7d36264b25a637a5ecbd764247f4395c8e5cbe62996860164982cc10bf0. 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/USUW61100037 — a six-check JSON result.
The Nutcracker, Op. 71 (arr. for piano): IV. Russian Dance, "Trepak"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bca48180effbdd60c6fec99e54e3302b2fbef00b516a098aed717a7a2ef5c5d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUW61100038 — a six-check JSON result.
Aus der Jugendzeit, Op. 17: No. 9. Weihnachtstraum
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1ee39f1bb2113fcf891c50c8ccd6f302d380e81f5be3623ec540fa4e0c56795. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUW61100039 — a six-check JSON result.
Yolka (The Christmas Tree), Op. 21: Waltz (arr. for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f66803e90309d469987dd3f0abf4f0a2168239761991cde81e96f83c75112b8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUW61100040 — a six-check JSON result.
In the Bleak Midwinter - 3 Etudes de concert, S144/R5: No. 3 in D-Flat Major, "Un sospiro" (arr. C.M. Taylor for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c2e8c75bf8484b42a7c0b006c4e72f67a54e509e0d44f02cf691a15c519ef88. 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/USUW61100042 — a six-check JSON result.
My Grown-Up Christmas List (arr. J. Biegel for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7855087f1e9d3c08f6c326b4a32b7e04877cf938a927d76895e41c7b24972b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUW61100049 — a six-check JSON result.
Auld Lang Syne (arr. J. Biegel for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9812bd62e076dcb463eb637d4745bb5e68891448a3961dea1437cd10c5927b26. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USUW61100050 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb41dc31d0e247c3423b551c222c0099bd9a6316df4dc61496ee61c0be6643702. 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/USUW61300001 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c54a37b208ca411a93e55bff04ff7722bfb226238236e5f2bb33f67b51e4540. 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/USUW61300007 — a six-check JSON result.
Kamenniy-ostrov (Rocky Island), Op. 10: XXII. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7066aa16d9d34838639c10d201d64b785c054791e6587cb870d869b5911db9d. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/USUW61300013 — a six-check JSON result.
An der schonen, blauen Donau (The Beautiful Blue Danube), Op. 314 (arr. A. Schulz-Evler for piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30fd060fdc6a06b685e41c637d0a1e212dc1ef4c92cf11350bba0ed951640db. 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/USUW61300015 — a six-check JSON result.
Songs Without Words, Op. 19: No. 6, Venetian Boat Song
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2b675fc3f930420197e3efa36f83ddee178a7f430b697bcc71faeeee8f6c2b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM21944388 — a six-check JSON result.
Three Nocturnes, Op. 9: No. 2 in E-Flat Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dabf4cb610a2d6089ffe933b83002c53ee91272d3070d40d61c325d7ae31978. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM21944414 — a six-check JSON result.
Cyberecital: An Historic Recording (Live)