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 0x6178279e47f9fac68b006916cf89f62475d00efc2a80c8c23717343716acd546. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/50fdd825-06a5-4a7e-987f-6439de694317.json and https://artists.proofprofile.net/proofs/artist/50fdd825-06a5-4a7e-987f-6439de694317.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
12 Sonate da camera, No. 12 in G Major: I. Largo
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 0xdbdf5cc6c6f969a55fe734470ec9b6a7f72f0ad170c369c834a978918939e3d6. Chain 2 (Bitcoin): anchored in block 960225 (2026-07-30T08:04:30Z), 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/DEE472000289.
12 Sonate da camera, No. 12 in G Major: II. Allegro nobile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf3cb3fe7158ef12227b7914756e447c4bcaf27f5ee43f766bebe9e27cfde633. 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/DEE472000290.
12 Sonate da camera, No. 12 in G Major: III. Fuga
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafc6f44e4b2c56d7e0982e720bc7af5b178a5591ba7b69a28e20c8f4b62c7c80. 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/DEE472000291.
12 Sonate da camera, No. 12 in G Major: IV. Scherzo pastorale - Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d0ba868d003759d305785bfe7c1c1bc67312e9647d48782d723e463ad01faf6. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/DEE472000292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c2abd2307e0ab454d20dd30a4ad6d004bf123e8f38419ac062ea47815ab9ea8. 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/DEE472000294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f1a67895eefd5a6610701255a682f2b22b3261cf7f3b0b095299345bec530b3. 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/DEE472000295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fbcb67f0559e8825f672b7f2f66d400eb2a85e74c647bd6ef9cb4d7faa71a74. 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/DEE472000297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf194325fd90be73ed961f8a7161182711b4883ec4d3a0a3ea4e536ae5fe8c1bd. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/DEE472000299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cbbd9d8df4ef791b282a1de31e77a2290cc18de40f7971797e05e1d92eee252. 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/DEE472000300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51e9a079b5c4c2a5f47811fa16e69b2db200e896adf2599198f2c7d07d1e4935. 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/DEE472000301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b0a74df0a109d23f179dc542ee2fbe78c16d9984ed47e8b78782d140461467a. 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/DEE472000302.
12 Sonate da camera, No. 8 in E Minor: I. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x960616b6ac2814351683abe1b91b3f43991daf3ff6dfbf3513fc172f35a1a33d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE472000304.
12 Sonate da camera, No. 8 in E Minor: II. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44004870c0f4a3c6959115aa2b96d9bafceaf3873ac0c3a4003f2b67205caebe. 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/DEE472000305.
12 Sonate da camera, No. 8 in E Minor: III. Affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bfffac273b8974ba3a7c29c4d68918cbeff978a09bf4d791bf936c9471cbea6. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/DEE472000306.
12 Sonate da camera, No. 8 in E Minor: IV. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x822a5bab55f9349758106d3cf13e6653d49969799cee08a6a5fbb7b3ae6bb2ff. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/DEE472000307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4b3ae84e868eab528c756610c6f2d75b84aafae101207cdf99d0a5b1e01672c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEE472000309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd89cf924c6ea629c5161afafc0167983051ddb9d9709a8502136f98c76bfa91. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/DEE472000311.
Concerto for two Mandolins in G Major, RV 532, F.5/2: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d36d52cf7977b77d2430c1d3838551b5b52942cd0b31b9816b08360dd16ac3b. 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/DEE472000098.
Concerto for two Mandolins in G Major, RV 532, F.5/2: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42eaab08af453405a4f0de58609049edf8dc10df1cf79e5feb0ada5e9c43e59d. 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/DEE472000097.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d36d52cf7977b77d2430c1d3838551b5b52942cd0b31b9816b08360dd16ac3b. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEE472000098.
Concerto for two Mandolins in G Major, RV 532, F.5/2: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x723bdc3c70b5dca1b49199bf4867f677841c4323255e308c6f00b34d4a5519c9. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/DEE472000099.
Sonata for Violin, Mandolin and Basso in E Minor: I. Preludio - Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9083673c925173e4a65228ab36e6623bc7e9fd8af651e08300423340c29c2625. 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/DEE472000105.
Sonata for Violin, Mandolin and Basso in E Minor: II. Canzona
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb13333991279b39669669a413b0b0df91d7519b1280470fe990ee04ef6b4cac3. 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/DEE472000106.
Sonata for Violin, Mandolin and Basso in E Minor: III. Courante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9dd5a4e6f708e85ed2af0035d2ffa3157eb79727ef346a48ac6f25b9b5a0e96. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/DEE472000107.