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 0x49820e77b8da942f60db9fa81e9730979c86dbdbfdb50165290e22399aa4cc2e. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e4390df5-dd73-4c85-bcaf-4d9215fc429e.json and https://artists.proofprofile.net/proofs/artist/e4390df5-dd73-4c85-bcaf-4d9215fc429e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Finger: The complete music for viola da gamba solo
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 0xd069ffdfe4badba287f887c84f2b28403312111597c76186ed76e3c16741aa67. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DECP61201001.
Sonata No. 3 in A Major: Viola da Gamba Sonata No. 3 in A Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c32e9bc08ac2ca2276b95970c3fe82fb4d2791be219516916b1521639b31b6d. 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/DECP61201003.
Sonata No. 4 in D Minor: Viola da Gamba Sonata No. 4 in D Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0a05307074a4af79b97ede0c3ed64ce44545bea616fb0bdba444713f17c62a0. 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/DECP61201004.
Sonata No. 5 in A Major: Viola da Gamba Sonata No. 5 in A Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49455339eeff02d374784ce1cd81fb55ce618136f8d8d39361a354549891b81b. 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/DECP61201006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd57803a46e337c3d8911452947d46dc53c5d6ad50ea7d406394a99c07942fa82. 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/DECP61201014.
Sonata No. 1 in D Major: Viola da Gamba Sonata No. 1 in D Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34990695af43c1fa42fbdc54b6657ee8461402c82503cb1df282d2c79261daba. 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/DECP61201015.
Sonata No. 2 in D Major: Viola da Gamba Sonata No. 2 in D Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc66522d0a027155e344051c57175f0a75a2535c8586f1c7de55b32c168e3a2d. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/DECP61201002.
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
Sonatina in A Major: Viola da Gamba Sonatina in A Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd6c3bcb8df8a09a67f3a9cf0689a31ce960ab605ae30acdae21dcdbf26a1767. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DECP61201005.
Sonata No. 6 in A Minor: Viola da Gamba Sonata No. 6 in A Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdcc3b71c82fe62a807b22d8cb02ca4a926d3765fa55604353398e16c68d6a1f. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DECP61201007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe1dafd80ca1f4192e74389e0a04d2a0c1d0bab2d742de7e8fc5f4042b4c5e9c. 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/DECP61201009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb32beba0b170fcc8c367d85c04837fcb68222f5e76d373107678be71a84ebaf. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DECP61201010.
Balletti scordati: IV. Sarabande - Double
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7a0b83380a60d01ab4b7f3807e63bc44a4ca452c5fb4ae4700b986ed8cdc75. 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/DECP61201011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b62f09dfc7b04f0e9ae7ee4f39108ecb0438521582939d73ff5d7f8c9b826a5. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/DECP61201012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0964e700a6b20a93c9fb601d95ddca1c1f83b53093322331771630631d13c58e. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DECP61201016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb31f71720545ec62f694e13e65881eed0ea1bfa1ab3044e0ddb2981f47d82c0. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/DECP61201017.
27 Pieces for Viola da gamba: Tempo di minuet, WKO 188
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x758fc827b757e22faba376b4c54c93390e13f261f2eab33daa65baa600ad6354. 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/DECP61507003.
27 Pieces for Viola da gamba: Vivace, WKO 190
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5972aac3c28545fdea8be9c9587cbfba0e1225538ba5fcc74d84eb73c8feb48f. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/DECP61507005.
27 Pieces for Viola da gamba: Tempo di minuet, WKO 200
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e1a0cd3644dbfe305c00fd01e58254f87f1fd31b781c4f519d0fe73542d60fd. 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/DECP61507017.
27 Pieces for Viola da gamba: Prelude, WKO 205
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1db59d5b4891deefdf57493c8bed8bedd30a7128ad08de141b0142a06e990998. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DECP61507022.
27 Pieces for Viola da gamba: Allegro, WKO 186
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcbff42e4fb25cf457b07cfda08f2a50e7b8c3f4174736e09b9c30e7f4d927d6. 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/DECP61507001.
27 Pieces for Viola da gamba: Adagio, WKO 187
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99345a336c216c973e45b987c84e8908637f9832d5b51d110e2e822bbda3052b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DECP61507002.
27 Pieces for Viola da gamba: Andante, WKO 191
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01cf74672bffe012341abd6b3fd9a38dace34c454de362a82dc0f4e191405922. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/DECP61507006.
27 Pieces for Viola da gamba: Adagio, WKO 209
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07cd88233492e689066fac16927a996416481e153a483c06aec2295e56617e87. 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/DECP61507026.
Frescobaldi, Monteverdi, Byrd & Simpson: Masses