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 0x50d7797baa611804e3ca69e8da4a714308cac9fe2898f8dcd3ac2816ee4e2344. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8836b310-d05f-4436-af9d-a73ae029376f.json and https://artists.proofprofile.net/proofs/artist/8836b310-d05f-4436-af9d-a73ae029376f.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Vocal Recital: Mattila, Karita - Schumann, R. / Brahms, J. / Merikanto, O. / Melartin, E. / Sibelius, J. / Schubert, F. / Dvorak, A.
Northern Lights - Music From Scandinavia
Kuula : Sunrise Op.11 No.3 [Auringon noustessa]
Tapiola Chamber Choir and Friends of Kuula
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 0xaac0dfe88ef3f3523ae6f6d9d190e0e0ce5c298261469ddcd1c3dca15c30084d. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FIFIN9400326 — a six-check JSON result.
Merikanto : Oi, muistatko vielä sen virren, Op. 52 No. 3
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x828afa5787632f81f2ad2450880e16d5d1cf2a9801509857d181d812bbe61cd5. 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/FIFIN8100400 — a six-check JSON result.
Sibelius: 5 Pieces, Op. 75: No. 5, The Spruce
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x389b6ebe86bb7ccd58170442e07c4041c008d605e098d094afb42f1422b18630. 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/FIFIN9201100 — a six-check JSON result.
Viimeiset kiusaukset, Act II: Paavon virsi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb308ac5186d77e4ac754babbde57ba8b2bd112d83c72d51db1af584891299e8. 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/FIFIN7800048 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb43ae4b133284d6bc4c222d0677c3ffd34cde0d5b8d6d04715389ad5e21d2ab0. 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/FIFIN9100011 — a six-check JSON result.
Violin Concerto No. 4 in F Minor, RV 297 "L'inverno": I. Allegro non molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x650a202d4b2e5b9c5c31d992845ffc155f13657119d7f1297ffa306df47f13ab. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/GBAYD8900157 — a six-check JSON result.
Études d'exécution transcendante, S. 139: XII. Chasse-neige
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54fe20e0a6c4841773e421fa1736ab6dca7adaa11e1480ef69e5ceb01cfd5b14. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/GBAYC8800624 — a six-check JSON result.
Classical Music for the Christmas Holiday, Vol. 1
The Nutcracker, Op. 71: Danse de la fee (Dance of the Sugar Plum Fairy)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb621bb64d2a8ba219e2f6950b867120bfdd619a982db2f1b804d3a8549c85c39. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1613247 — a six-check JSON result.
Maria, Herran Piikanen (Mary, Handmaiden of the Lord)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0afeb57578fb02e941a9b07bfc200c2e23acbb275eeaecc798f17f073369cbe. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE9400043 — a six-check JSON result.
Vocal Recital: Sirkia, Raimo - Sibelius, J. / Adolphe, A. / Madetoja, L. / Franck, C. / Berlin, I. (Valkea Joulu)
Rautavaara : Cantus Arcticus, Angel Of Dusk, A Requiem In Our Time
5 Christmas Songs, Op. 1: No. 4. En etsi valtaa, loistoa (Give me no splendour, gold or pomp) (version for children's chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8adffe2ea6b061fe19c0fad6a56c8e4b4a0a696898e3faab826f235094b2a31d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE9400056 — a six-check JSON result.
5 Christmas Songs, Op. 1: No. 5. On hanget korkeat nietokset (High are the snowdrifts)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0ecc8927ef6cfe9b5cfd059cb8b1734ea70350d8f6ad91e81fa1bb2210ab1f5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE9600130 — a six-check JSON result.
Songs of Youth, Op. 20b (arr. I. Kuusisto for voice and orchestra): Arkihuolesi kaikki heita (Cast Off All Care) (arr. for mezzo-soprano and orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x684d78a9a79a80061d6a433c2c987cbd57ce856e08f697659a021711d944b185. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FINDE9500280 — a six-check JSON result.
No onkos tullut kesa (Is it suddenly summer?)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb1536baa907a5125dcaed90892ebdc12ab3676bef8364aecd81d6cd97cdcb62. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/FINDE0000167 — a six-check JSON result.
Englund : Symphony No.1, 'War' & Concerto for Violin and Orchestra
Englund : Epinikia, Symphony No.2, Symphony No.4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6815ffc6d331eab6e996e4c707f554d81cc7d8cc594d6432fcd79b316c965a05. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBELP1100086 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c109db4a2abdfc853528fa22a24007208bdef2a53eb972db7fcccc5a026f7da. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA809007202 — a six-check JSON result.
Massenet / Arr. Marsick: Thaïs, Act 2: Méditation
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08c436e1471764cffeb734dc59bc3ddfc1c5f6b6cfcb6656eecc4114217ff757. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ209300110 — a six-check JSON result.
Schubert / Arr. Wilhelmj for Violin and Piano: Ave Maria, Op. 52 No. 6, D. 839
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39063d265101b93dd02cc6f9060470ee378a0c47aaedc0a863fa7a21635bf127. 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/FRZ209301050 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49a7332c31b22807eefe1be7d4535454c4d1afe304ea39259244b10e1a4f8b7e. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FIFIN1100015 — a six-check JSON result.