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 0xdb73ca51a51bd2732b4236a24a2b9ffa597b0026298ab6ca8cd249a1e400f0a7. Chain 2 (Bitcoin): anchored in block 953724 (2026-06-15T01:43:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8d8671a5-b5c0-47d4-b2cb-b83c6122f4eb.json and https://artists.proofprofile.net/proofs/artist/8d8671a5-b5c0-47d4-b2cb-b83c6122f4eb.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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.
Gruber : Jouluyö, juhlayö [Stille Nacht, heilige Nacht]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d923074e13356b4e3a7975920b8bbadf745a7aa1593b9c30e2814b5f3e1bf18. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/FIFMF7600078 — a six-check JSON result.
Sibelius : Viisi joululaulua Op.1 No.4 : En etsi valtaa loistoa (Give Me Neither Power Nor Splendour)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x234ca5b4eeff59624708fb6715ebcb05b62738d802771d20da88db443d682b5d. 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/FIFMF7600036 — a six-check JSON result.
Sibelius : Viisi joululaulua, Op. 1 No. 5 : On hanget korkeat, nietokset
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cd75a54be6793f0f48b9c8cea2075e46cba782f178e04563ae9c9816e053d38. 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/FIFMF7600074 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x777125e4b748b76edaa3a7e002ac61ad1cad2ba13f6378117329b35b49467cf3. 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/FIFIN8200500 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b106c515b0cf1d4f2180a9ea5f7183a969a07bfcda4910c047461daa169e75d. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/FIFIN8200700 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34f6d7f72a07d3089a0ce77c837c39966b5ad852e085cd09ea424a78e4d1d6e9. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/FIFIN8600093 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b106c515b0cf1d4f2180a9ea5f7183a969a07bfcda4910c047461daa169e75d. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/FIFIN8200700 — a six-check JSON result.
Merikanto : Kesäillan valssi, Op. 1 No. 3 (Summer Evening Waltz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa7a3496309793da601e82544dc9249a2bf8569b59d9f763396859583c4543aa. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FIFIN8200200 — a six-check JSON result.
Merikanto : Soi vienosti murheeni soitto, Op. 36 No. 3 (Play Softly, Thou Tune Of My Mourning)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x469a0b25eb3f145d969e3f54fcd29bd801643d859e43f7cf023ab6cd9dd68995. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FIFIN8400500 — a six-check JSON result.
Beethoven / Mozart / Wagner / Mussorgsky: Opera Scenes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x658fcde5769f08688d3fe3988ff63441ff710b5d048302f51b2465ae519bc168. 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/SEAED8774040 — 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)
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.
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.
Preludes, Op. 28: No. 7, Andantino in A Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e5c2fd1d7513497332c345cd3a4885251811bb0e3e633445aa749fd513005f0. 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/GBAYC2102462 — a six-check JSON result.
24 Preludes, Op. 11: No. 8, Allegro agitato in F-Sharp Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x365a41081ba8d9bc23b7097c08907b89f635f8658292c66d9125418069f5f7f3. 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/GBAYC9600922 — a six-check JSON result.
Kuorojen joulu (Finnish Choral Christmas)
Romeo and Juliet, Op. 64, Act I: No. 13, Dance of the Knights
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd19bbb161bec3f1b6eab23cdfb7dc46341bba4a9f41391c0a0890498e4cff33. 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/GBAYC8700388 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621de62f17f281e5382cbd6c00ebbdbd22c9ad3f6e6339ce5fe499390872b86c. 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/DEC628800661 — a six-check JSON result.