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 0x3f0f47148d9ed08b1da8f68528c8e3770ed770f000b4171f868d7599b8542ac8. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/33ce6dbf-1111-4cb0-9709-e7fe8a6763b7.json and https://artists.proofprofile.net/proofs/artist/33ce6dbf-1111-4cb0-9709-e7fe8a6763b7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Alessandro Marcello, Oboe Concerto In D Minor
Oboe Concerto in D minor - Allegro moderato
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 0x212826b7a83bcafcbc02bd2c4fec9b5720a201e975d022174491f5976ab05238. 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/KYCC20001383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec0db6ff534baa07934e648530f8f852f401171f4e6ab910a86cd71cad715eb. 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/KYCC20001384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08ec1ddd1e2436fe6afb279177f5454628e203eda851f4578329c7542618e5fb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/KYCC20001385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9850be83c0e0f3fd5c57e079422539a48d135f90f225d3b6a37dcf8bcdae4a7c. 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/KYCC20001386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42c09aa829cdd84a2ddbb96120c6f133b030513d5928ca4ebf57bb63209d1bd3. 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/KYCC20001387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bd63aeb6d4ab0cb7df7ebc9bca2a11cf3134787bb629a7abe382cedab7b1b5b. 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/KYCC20001388.
Oboe Concerto in E flat - Maestoso e deciso Larghetto cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd41d2911ab2fbe3496be162e3b9e17a8d94c1e4fc33903785840b005afadd25. 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/KYCC20001392.
Oboe Concerto in E flat - Allegro a la polonese
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa23be3e5ecb0d1453a3da2768b018f154c0524f67a715d548c284de12f543e32. 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/KYCC20001393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d57a48372b35189a61e028ebd8369e078c91b48abbfb67cf0d0a3e811f5655d. 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/KYCC20001394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6db5f6529ad9abec4e46ae0895805d1dab0e5e3f21995ae34a429b89ff979f83. 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/KYCC20001396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x246cbebc5f47e3a54f07401a880fb7093662bff0a6fea1f8d04ce6eaa0865a21. Chain 2 (Bitcoin): anchored in block 960164 (2026-07-29T23:23:05Z), 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/KYCC20001395.
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 0x3bf6805285838513d943c4569dc3ff71ef4eaff60cc80ab3162be9e0f6468639. 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/KYCC20001397.