thumb|Langlois de Swarte playing Dido and Æneas (Henry Purcell) with Les Arts Florissants in 2022. Théotime Langlois de Swarte (born 1995) is a French violinist. His repertoire includes Bach, Vivaldi
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 0x8425a1f2a3bd079e9179b245cdb26fc7a1754903bc464f579c0d0049a58ba060. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7d4c9e0e-7016-403a-a15e-ef66c6fe7c7c.json and https://artists.proofprofile.net/proofs/artist/7d4c9e0e-7016-403a-a15e-ef66c6fe7c7c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Robert Schumann: Kinderszenen, Op. 15: No. 1, Von fremden Ländern und Menschen (Arr. for Violin, Cello and Piano by Trio Dichter)
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 0x44400210abb507b4a614b3b39a6eb79434a1f1e2171b0d6d37795db849656431. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR7JM2003010.
Sonata sesta for violino solo: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a004c3610318c2cfa028c39f10d4860c3bda8e6a34562486cb67f60118e244. 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/FR7JM2003020.
Sonata sesta for violino solo: II. Allegro [1]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bfdb568a8cc13b9163fe1760e4c85d67204bdf8b15e650516d0f755a3fc3277. 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/FR7JM2003030.
Sonata sesta for violino solo: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70ac9b24e354ccf2ca89613033f7d05fb38c3c7c58861e715bf5f5a2ff1e2cd2. 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/FR7JM2003040.
Sonata sesta for violino solo: VI. Allegro [2]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51f10fe4d7dd61dd4562733b0599483533be0cf369e94aff20d03a05de8b59ac. 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/FR7JM2003050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30693fa6c0556c79bf3ff15d185cb8797c0be629da8b7c30136384150be273f. 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/FR7JM2003060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4bdd739b1b36e451b226b7a5f94f17b7d02c6bb60fbb2a7dc08e110e7ce9bb3. 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/FR7JM2003070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d5767ec786dc9e1675a9f46499a56dbcc5f446802364088742d075bd7312def. 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/FR7JM2003080.
Suite in A Minor: V. Sarabanda amorosa (Adagio)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ac34350a59ad088dd3ad2df873b360a9a28989ee3be25fbb987a78096079dec. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2003090.
Diverse bizzarrie sopra la vecchia sarabanda o pur Ciaccona
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd09ed597530bcb083da4733a81676e9e003085501801fce0ce9562060b3ecc2c. 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/FR7JM2003100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b1a5863914fa0044dfa566db5faa2c71fda2ecdbb90f4e0a6c78c9f1f7d184. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/FR7JM2003110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8a19d9c5232ac7afed96300fb617921edf5d2198f9f8e76ddd0e1bde2280692. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/FR7JM2003120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa62d88d3fe22f42766752c73d58dd059e5b2d6788bd44b1750bbe5df3712f5dc. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2003130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00e9a58c725457575b1395630dce8488028432a2a1da68b956c7cef3ebab08ab. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2003160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98d3e94f5fb65798ddfee7191b95702b2aa005f601c87127ab680ec98e240341. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/FR7JM2003180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0148a938824fcac5b96a9f68e738c72d907faa3700bd0d0705ecb13c008ce185. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/FR7JM2003190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50a49685f3a2a83e0734ac1b15d4e71aa40e4b6c27c6508753721617dc3aaeba. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/FR7JM2003200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe51f190229e2b13374753c9c32f6da65d29d9d8f16a7468fe3af8ebe4533be7b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2003220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecbdd24461071e7db00137344324ff624c82f6a49f9f072082a028baf25e2bb2. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/FR7JM2003230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5904785c237d6df67d442cab089bab7f94069aa290b7e3ca119d8e46868c4ae6. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/FR7JM2003240.
A new division upon the ground bass of "John come and kiss me"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbd3372f0607b1176270676c42e427251cf2c8d91dbd7b05a055dfee2cd0a88. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2003270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f670843278395fa1f49ad7cb196efbede5a5a0759cfc7942e4bc3bb72eba5e4. 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/FR7JM2003280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b2c7f17a4b2a5659dffaf661f612617352b6afc6a35d20394422b5f687192a. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T14:52:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2003140.
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 0x7317af37d009f0c2324351be1c8c56db9b9a92ba1f9d7c5cf39dcb47a2ee2c1b. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T19:51:00Z), 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/FR7JM2003150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf31bf3a56a45d7325911e236f355c083b5263bbdd63d59f59fdacff57548eb92. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:38:33Z), 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/FR7JM2003170.
Suite in G Major: VI. Giga Al Genio Turchesco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752181d858e9e9310d4ce166c1e85ec879453ba277192985283cb1dccd84292e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2003210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe7611f2838bffda003e43e5e1ebaf71ba55f075702fd3e0af1f0ec95dd21309. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/FR7JM2003250.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f365ffd60ff3c1de6914fc171b22b112b5338a941cb6640a410ccaedf0d3f70. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2003260.
Vivaldi: Violin Concerto in B Minor, RV. 384: II. Largo