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 0x972e42a19859ef811025b5fefa50d26bca845650095774e426aa6da2894e6466. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de5e02cb-f1e9-4be3-aae3-e49ebb74e1e7.json and https://artists.proofprofile.net/proofs/artist/de5e02cb-f1e9-4be3-aae3-e49ebb74e1e7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x9f35c915132936cbee5482811643ba9f5894215a94d9e23c148625854bfb1070. 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/QMT2Q1228006.
Burgmüller: Eighteen Characteristic Studies, Opus 109
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc255bd69dedab3ec26bbaae46854c844d3a9b552258d5a907963a64518bed042. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QMT2Q1229001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c82f606a2322f280cf33f5c744853e22bcb7b40675ff59058fc48cfbf7ce59e. 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/QMT2Q1229007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1161a219f172e0f3138157eef56be07a767c2820c2d2b719b0c94bd7e2d8c15. 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/QMT2Q1229009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaa25f7f5e383baf73a9c1a856cfb2d671c366500b66ac208b272946e51623bb. 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/QMT2Q1229010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9830e27239be1855507798ffdb90dfc3e5c6a09a03a0d045e9c1d983dc958d1a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QMT2Q1229013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f4743cf221681b4e749ded8e61a6bad246a54caabd070efca7160b18724a7a8. 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/QMT2Q1229014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb81b060c0b00ffe12ba38041fd773b641aec6789486fc6647023033c92602dc7. 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/QMT2Q1229018.
Angelsong: Christmas Music for Piano and Flute
Mendelssohn: Selected Songs Without Words/Scherzo in E Minor — for the Piano
Songs Without Words: Venetian Boat Song, Op. 19, No. 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe20108f112f396cab94416a7462eb971ef11dd13e49839f4a5c52794afc3df14. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM91296505.
Songs Without Words: Venetian Boat Song, Op. 30, No. 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cd9213f4f9563bb88b9badc31da1741c62692f8e86994fa571f2681c3d98d87. 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/USHM91296506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a44e4592ec56a2123da22c4733316b137941085da04e2d05b877c5346d6da4b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM91296511.
Chopin: Selected Works for Piano, Book Two
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b32f373b420d865d34a282cf24ff0ff77f7857680200bd09b5423494fed82e3. 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/QMT2Q1200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91fd4d3601e59b17a7121df66dee28063788670807ead84a211c55f9c9303997. 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/QMT2Q1200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4d80630d675f1375c6bd338093292c4a3c18305241758bb4be236e87173070a. 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/QMT2Q1200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x244de8aee47b1e6974d788f6d1c203df6f41d7aec6a9a661f73bfed90f8c8563. 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/QMT2Q1200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c1f3ff958ee76222acbd594dedcea9896bd4cd48ad6f90856963b115ab32e8. 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/QMT2Q1200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02752882e1808e6bef3efe7eafae03fece8e33444577f51e42b2d0ba3e5054b7. 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/QMT2Q1200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c39fc279dc65823dc9de873ebe43a1f4c0cbebf9c1a4b07504d26fc341797f7. 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/QMT2Q1200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11c514d8e494241b666a61f03e20c185acfa763318cea048830737294b871e71. 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/QMT2Q1200009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d363bb35bd428a6e7c95ae0191261f878eb7830ca128d1aeb62a8e03c9776cb. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QMT2Q1200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60589d9374e42f4140f275ce1658b9da751050f207fe7ced9eda24b8da52af36. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QMT2Q1200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0183999a43c1ec6846d9dff83ddc073a5b44e7252cfb1a8ec35c4360f0ce3b03. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/QMT2Q1200012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1968c23f32fac3b9364106bfac4c5a21c870d946af3364f9b8fe0df0aa99e5c5. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QMT2Q1200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5804e86a3ae6af98ab7e4f7f2b5d7fab79c4251358cde272c53e3cb654ec8333. 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/QMT2Q1200018.
Chopin: Selected Works for Piano, Book One
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107772af1de62057eb0a0914e782111d941d2b3b107a0077be2a047509697c98. 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/QMT2Q1207001.
Schumann: Album for the Young — Opus 68, for the Piano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x074c820e70ada473122b6b49bfb1abc182c41261d34a32e46f846e3c368f56c3. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QMT2Q1222008.