thumb|Seldom Sene at the Quincena Musical de San Sebastián, 2021 Seldom Sene is a recorder quintet founded in Amsterdam in 2009. The group consists of five women: Stephanie Brandt, Ruth Dyson, Eva L
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 0x949760c5b5fdd1d0b49bfbc7c07c250fe230d36f3a4fb687328fa83b0a904e80. 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/8b98b43b-a434-45a1-b853-ef8bf9bf44a1.json and https://artists.proofprofile.net/proofs/artist/8b98b43b-a434-45a1-b853-ef8bf9bf44a1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Orchestral Suite No. 3 in D Major, BWV 1068: II. Air
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 0x494c0b69bba5db928681b5fce2a8632a6103da216a631cb9cfa4fcadfbde2e64. 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/NLY331406810.
Fortune Infortune: A Portrait of Margaret of Austria
Taracea: A Mosaic of Ingenious Music Spanning Five Centuries
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a9364705d22215c98020d50dde9a00fc546d664f0ad22999cf97ebaa88d706c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLY331405806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd188f53b1cd6432c10b0c2aabbde9eab0438d4ea18451d26039c0f6775c78d8. 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/NLY331405814.
Concerto Grosso, Op. 3 No. 10, RV 580: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaada5551927c54c6cc099f2dc2bde22458ab7cef16903b79d6e563234b47a451. 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/NLY332002363.
Concerto Grosso, Op. 3 No. 10, RV 580: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfeba28ef579d07bdc6ec2320bc33a0fddb60cbc250abcf3f604579b4ac932c28. 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/NLY332002364.
Concerto Grosso, Op. 3 No. 10, RV 580: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57fe6db4048befcbaaf699673854878ffbeaabec9ef95ef0bd88312b2bb4cd35. 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/NLY332002365.
Concerto in G Minor, BWV 975: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ec0d07b71f64af126366f909d7dc8a9f38d073d6fee835e67ede68bfe5eebe4. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NLY332002366.
Delight in Musicke: English Songs and Instrumental Music of the 16th and 17th Century
Goldberg Variations in G Major, BWV 988: I. Aria
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d324bfe2a34f3ebe799d96e8760449eb23cefb84d6dcca7c3215950916e774. 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/NLY331704250.
Goldberg Variations in G Major, BWV 988: II. Variatio 1. à 1 clav.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd41930d981f84d1cb580f59e48247466ac88d761e2d728d962ffc29dd366dad. 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/NLY331704251.
Goldberg Variations in G Major, BWV 988: IV. Variatio 3. Canone all unisuono. à 1 Clav.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5137a38ccd0efeb252d526f58d90685b13d223b55a7bdc4397a9670bcc53ef08. 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/NLY331704253.