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 0x357f8c748657946af108d5c0210dac0b0fcc2c63820fd7359a48c6585850160a. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a273eed-3fe6-4e77-88a9-393d4a98b5aa.json and https://artists.proofprofile.net/proofs/artist/9a273eed-3fe6-4e77-88a9-393d4a98b5aa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Suite in A Minor for Recorder, Strings & Continuo, TWV 55:A2: III. Air à l'italien (Largo, allegro, 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f38257637278c7d3b94d49fb9394a67e581c8a13f6de9911994b4baee34aeb5. 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/FR50X1524504.
Suite in A Minor for Recorder, Strings & Continuo, TWV 55:A2: IV. Menuet I & II (Alternativement)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfdbbb7b3421c0207b96bbfc41797e1543b6351c53444a6c5d527829d562c0bb. 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/FR50X1524505.
Suite in A Minor for Recorder, Strings & Continuo, TWV 55:A2: VII. Polonoise
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0674c54215bfe72181ea59e5d6a45a0d8d4c0cb6ca6ecbb54fb223447ab7f774. 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/FR50X1524508.
Concerto in C Major for Recorder, Strings & Continuo, TWV 51:C1: I. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a961c3d68a36bf6dda7bb36f383c58e6be9125bec1575fc29cda53e9940cd0a. 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/FR50X1524509.
Sonata in F Major for Two Chalumeaux, Violin & Continuo, TWV 43:F2: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x033d66c46b2b968e471687d77357485b711fbe2a0d5c04f7e4a1a9a2243e6ad5. 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/FR50X1524514.
Sonata in F Major for Two Chalumeaux, Violin & Continuo, TWV 43:F2: III. Grave
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91e5feeff902564078b9485066e5e1100e38079d4ad05305668b4f4af52c93bf. 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/FR50X1524515.
Concerto di camera in G Minor for Recorder, Two Violins & Continuo, TWV 43:G3: II. Siciliana
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2efbb79274774d79cc5b434759ce7eedabab27371d7bf5e6a6f3bb4781774508. 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/FR50X1524518.
Sonata in F Major for Two Chalumeaux, Violin & Continuo, TWV 43:F2: I. (Largo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f42a919138fa9d94ce78d2469f9bb1099ecbb5e6cf793b34dabcfd6fda8615. 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/FR50X1524513.
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 in F Major for Two Chalumeaux, Violin & Continuo, TWV 43:F2: IV. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fec3fbab1a1714f565867e2099678e4b7d794af2d3d73fc0022e78907192966. 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/FR50X1524516.