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 0x30675b528e15d04aa06bab9b74e39bf1218779bb3f32c6428f64cf34dfa5206f. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35b0fc75-e35d-4375-92ce-237e9010a0a5.json and https://artists.proofprofile.net/proofs/artist/35b0fc75-e35d-4375-92ce-237e9010a0a5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Romeo & Juliet, Op. 64 (Highlights Arr. L. Karlin for Trombone Ensemble): Dance of the Knights
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 0x682d9302772325bb14c1d86ad21668f593bbe3ee525dea770243cc041c3a2685. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DET901748103.
Pictures at an Exhibition (Arr. L. Karlin for Trombone Ensemble): Promenade I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3ad77aeb00ff6dcda96a20de87c5cc946027194ad3f81ee7b2c73cd257373a5. 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/DET901748108.
Music for the Royal Fireworks, HWV 351: Overture (Arr. L. Karlin for Trombone Ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86182dc1abcc0764bc56685e45508080cb1c1267244f269b56d61c98e7f98235. 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/DET901748101.
Romeo & Juliet, Op. 64 (Highlights Arr. L. Karlin for Trombone Ensemble): The Young Juliet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6ce38a9a91efd8902879311100937b1edcb8aeac65ea2076828585830d0521. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/DET901748104.
Pictures at an Exhibition (Arr. L. Karlin for Trombone Ensemble): I. Gnomus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe7a3ff260fcac622f19e04366b4a5af9704555ef5a9b497a3ac80ffe63f872e. 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/DET901748109.
Pictures at an Exhibition (Arr. L. Karlin for Trombone Ensemble): IV. Bydło
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8af8af4a38def0951bf9913b67a3122063ce96e1c36cf9725cb54c64c9b7e6b8. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DET901748114.
Pictures at an Exhibition (Arr. L. Karlin for Trombone Ensemble): IX. The Hut on Fowl's Legs [Baba-Yagá]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d46ec2b83173ce760914604b427ae3be762e845f62ed70caab2e4952c1852e6. 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/DET901748121.
Pictures at an Exhibition (Arr. L. Karlin for Trombone Ensemble): X. The Great Gate at Kiev
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x308ccc4cacab512ee54c09c78a05db981a4422cf13804d28feb938cd119401c1. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DET901748122.
Romeo & Juliet, Op. 64 (Highlights Arr. L. Karlin for Trombone Ensemble): Introduction
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf535bc0fd8e6c450718f70c5f739d92336b79918e6bbf26cd5e8ef28f9718b37. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/DET901748102.
Romeo & Juliet, Op. 64 (Highlights Arr. L. Karlin for Trombone Ensemble): Romeo at Friar Laurence's
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136b804e7c600643a1232ba7f0a64dfdb1ba26fa1f62d80291ba3df2e0eb315f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DET901748105.
Romeo & Juliet, Op. 64 (Highlights Arr. L. Karlin for Trombone Ensemble): Juliet's Funeral
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc38eda7b9b8814936e077f9fbf613c27cbee0fa1e046873469feb8ae909980. 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/DET901748106.
Pictures at an Exhibition (Arr. L. Karlin for Trombone Ensemble): Promenade II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f8abfa3ef20c4f5482b17ba6ffd839d93bf708a62fbbb5dc9d9ae9ea00cdebf. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DET901748110.
Pictures at an Exhibition (Arr. L. Karlin for Trombone Ensemble): II. Old Castle
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc27d8d5b7ba4dadd0063d3044cc9738bb780d57c6e4b710a088ef34f9589945. 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/DET901748111.
Pictures at an Exhibition (Arr. L. Karlin for Trombone Ensemble): Promenade III
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7a4b6fe8a7c69b8924cacfca984cf502f6f0b505b61c21a7834c854898e9d2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DET901748112.
Pictures at an Exhibition (Arr. L. Karlin for Trombone Ensemble): III. Tuileries
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2e00c4d3e6cd2d6590b13e7bfd33c9b123131541d58ae52dc1230ddeb78b8f2. 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/DET901748113.
Pictures at an Exhibition (Arr. L. Karlin for Trombone Ensemble): V. Ballet of the Chickens in Their Shells
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6c048e7ba74d5ee73f0b69d587126eacd93423a4c27abf3a011d8005d10c88e. 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/DET901748116.
Pictures at an Exhibition (Arr. L. Karlin for Trombone Ensemble): VII. The Market-place at Limoges
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a7a6b77e2eb276c7dd48fdb08082c8160ee6814c2e5820fae24f5ef082f5949. 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/DET901748118.
Pictures at an Exhibition (Arr. L. Karlin for Trombone Ensemble): VIII. Catacombæ [Sepulcrum Romanum]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd36a20afaeba1231ea5e53b6fd72ff24fcdec5f733d3668e48414966868e635b. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/DET901748119.
Romeo & Juliet, Op. 64 (Highlights Arr. L. Karlin for Trombone Ensemble): Juliet's Death
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfee2a27810611e3d7020ae28b0e6ad8466ea25e54d1123a9dfdd2792a35d2331. 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/DET901748107.
Pictures at an Exhibition (Arr. L. Karlin for Trombone Ensemble): Promenade IV
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45babdd59348bea6b69ba856433d1889bf297449bca086851063777f6101f9a8. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/DET901748115.