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 0xf968df7c06e7a00f5a8aafc6c7c911fe0b068784567eef090b0b88ecf0ccc035. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/62278c72-513d-44db-b2ed-b0e7b3c9b5d6.json and https://artists.proofprofile.net/proofs/artist/62278c72-513d-44db-b2ed-b0e7b3c9b5d6.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Sonata a Violoncello e Basso in D Major: I. Amoroso
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 0x9a2f64f51f86bc446cc67e68a4de3bc8a9501110362bc17783975027e31a0c56. 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/SKB260513227.
Sonata a Violoncello e Basso in D Major: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82e821d0a85d96e892fdf905d05278c7bf2e464604a3fff75f86698808994bbb. 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/SKB260513228.
Sonata a Violoncello e Basso in D Major: III. Menuet
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f9d378e40310c059535061f2f26f12d66618f581eacc3bccba37ed1dd472546. 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/SKB260513229.
Sonata a Violoncello e Basso in G Major: I. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01fad37fe7f9c133831415e1fbca3b9b7f83464d8690a1432b1e0dc25657cf1. 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/SKB260513230.
Sonata a Violoncello e Basso in G Major: III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22da6c1d07d9d61ab3aa5ce3157b286cd8880b50898f659484b71e8239780b39. 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/SKB260513232.
Sonata a Violoncello e Basso in G Major: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f9c9f49f702596aec71d590894e95e862f84e964da606042b9100fb1b49114d. Chain 2 (Bitcoin): anchored in block 960349 (2026-07-31T05:23:41Z), 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/SKB260513231.
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 a Violoncello e Basso in G Major: VI. Menuetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14627ee916aa9dcd26d6fcfca0c1c22c6bb09625a42c95397d5824ee8bf4010e. 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/SKB260513233.