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 0xe7799fc0745b797ca22f281482b23e27d5f68fe43783209f89d8a21245b4e4c9. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cab43f8b-68fb-48bf-bb02-1abb6d373b0a.json and https://artists.proofprofile.net/proofs/artist/cab43f8b-68fb-48bf-bb02-1abb6d373b0a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
From Mannheim to Berlin - Sonatas for Violoncello Piccolo
Cello Sonata in G Minor, Op. 1 No. 4: II. Allegro
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 0xf48ebe9de82e2dccdec8ed63bd5758f183d94930132bda0adb47e1d792f4c9df. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BEE022212302.
Cello Sonata in G Minor, Op. 1 No. 4: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1419f4bb388edb18ae528a41786ced01d9d67b11fd2c62fafe8326a7c683f2. 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/BEE022212303.
Cello Sonata in G Minor, Op. 1 No. 4: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x301451de7315d0235a582dd72717ccf98c661e21cbba1e89faae2ba54003cd1e. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/BEE022212304.
Cello Sonata in B-Flat Major, Op. 2 No. 2 "La Dupleïx": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ae7dbe2255fb3536939aed081af3b44124fcb24b81dc0ed2c762859c55b6cb7. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BEE022212305.
Cello Sonata in B-Flat Major, Op. 2 No. 2 "La Dupleïx": II. Adagio amoroso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38fe93c67566ff6a82064eb7220be09e501c59b96f6dd072364a095e365ee26e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BEE022212306.
Sonata for Harp with Singing Accompaniment of Keyboard in B-Flat Major, Op. 8 No. 3: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b7345fc18ae278ddef7b2aa818071c01069893e7d82e25c3cff5a6e060ee76. 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/BEE022212308.
Cello Sonata in G Minor, Op. 1 No. 4: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacadbd2ee1e379fe410ffe5ab83028cdd644a976d07f2af2d26bb95d295a4aa9. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/BEE022212301.
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
Sonata for two Violins and Continuo, Op. 1 No. 2 (Arranged for two Cello Piccolos): I. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956405764801dac07843a9dfd2670a1c44ddff0d984745c496ea473ab648d3c8. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLB152400658.
Sonata for two Violins and Continuo, Op. 1 No. 2 (Arranged for two Cello Piccolos): II. Allegro - Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8df6f66d5b47a40125fc3ffc0f9c1a7fab7a342526d458895eab1271da6fa483. 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/NLB152400659.
Sonata for Cello and Basso Continuo, Op. 5 No. 3: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd17b1da5da05e4257891e762b067de84cf6152ebd47bc61e8cdca4850b1c34c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NLB152400664.
Sonata for Cello and Basso Continuo, Op. 5 No. 1: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033506b776bd8683b02e5d07502fe7033994ca61650ab27c5ef9665d6be3e80f. 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/NLB152400672.
Sonata for two Violins and Continuo, Op. 1 No. 2 (Arranged for two Cello Piccolos): III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107001ab3c5910f8f1c3777a76464be8383932bd6b8e79331a48a070ec7594b4. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/NLB152400660.
Sonata for Cello and Basso Continuo, Op. 5 No. 3: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8bb93d840046dd63366f9cc98ce3572c3005077f1fbdd03a0de1d1e25731b3e. 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/NLB152400661.
Sonata for Cello and Basso Continuo, Op. 5 No. 3: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fd94a2a99cf4694a798dc0596335e1d944cf0a0592a5073bf547467dde29992. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/NLB152400662.
Sonata for Cello and Basso Continuo, Op. 5 No. 3: III. Affettuoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2839d14932e98ef7d7779f2520e6d0ff1530bf9bcf6471e3474eec2e81a2e537. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLB152400663.
The Art of Playing the Guitar or Cittra (Arranged for Cello Piccolo and b.c.): Canon
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc39e0eeef6dad613bb6d87ca87ae84e866253e063d116855a8f74bac1dec334. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/NLB152400665.
Sonata for Cello and Basso Continuo, Op. 5 No. 2: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a57d4edfb5699ded19bcc24c310d009c5a2af969c38fb9f9539a7528a34ac8a. 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/NLB152400666.
Sonata for Cello and Basso Continuo, Op. 5 No. 2: II. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8577f0533c1b1db884d288bfb621951dd4e1bd29f8be4cc3ac7c0a344d4f243. 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/NLB152400667.
Sonata for Cello and Basso Continuo, Op. 5 No. 2: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa56ac4779ecac07c9b719118c34a98a4a6f346f9d9aac83f92f73eaa32b68631. 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/NLB152400669.
Cello Sonata in D Major, ABV 39: I. Cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b48c8b42220ecdeccb3463ee7c931fe55342e4d0b45f57e441c1f6e83496a00. 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/BEE022414101.
Cello Sonata in D Major, ABV 39: IIIb. Variation 1
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aab950a6e1d21faa7b6267ca63907b11f79cbbca58119dad45d30a1d3a9abd7. 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/BEE022414104.
Cello Sonata in D Major, ABV 39: IIIg. Variation 6
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59fae41abaee4b089588f3c67de3d74928dce69fac863d841ecd694dc8038286. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/BEE022414109.
Cello Sonata in C Major, ABV 20: IVe. Variation 4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc04012e3956b134f482f33e768ada3a034da2cf21e259b763cd03e5005798d5. 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/BEE022414123.
Trio for 3 Cellos No. 1 in B-Flat Major, ABV 54: II. Adagio
Cello Sonata in C Major, ABV 20: III. Aria
Cello Sonata in D Major, ABV 39, III. Con Comodo