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 0xe2cf718df3eec1756052f67c20dbcc56696b1e88d11df9295b166256741d970a. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4850c3d5-6d52-43b3-9531-6f397e13ad4d.json and https://artists.proofprofile.net/proofs/artist/4850c3d5-6d52-43b3-9531-6f397e13ad4d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concert Royal No. 1 in G (Version for 2 Harpsichords): I. Prélude. Gravement
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 0x4a908e11d39a0f78f225a8f57d72bde82ac937a048191286e1f8a1b40b121d39. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FR7JM2374010.
Concert Royal No. 1 in G (Version for 2 Harpsichords): II. Allemande. Légèrement
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39a22c670f438e941b5cc9bdf6cefad06de364f7027db124fc90e9dd35284683. 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/FR7JM2374020.
Concert Royal No. 1 in G (Version for 2 Harpsichords): III. Sarabande. Mesuré
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd487ea651f5cc21be1384498d17ffba40e88d25f00eef2a6f40845a7f95910. 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/FR7JM2374030.
Concert Royal No. 2 in D: I. Prélude. Gracieusement (Version for 2 Harpsichords and Theorbo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3427d3c8a357445b2c5bbb74a4a74aa596079c402bdf7f2dd9ae46a5b8976e17. 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/FR7JM2374070.
Concert Royal No. 2 in D: IV. Air contrefugué. Vivement (Version for 2 Harpsichords and Theorbo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b33e10433169e63beb77d674f98e4af96dd66502871df25662c50080d8370a1. 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/FR7JM2374100.
Concert Royal No. 4 in E: I. Prélude. Gravement (Version for 2 Harpsichords)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0fc50dea46c065e521621251e8f7eb69d5225c474e7c31923943a50c2f60b4c. 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/FR7JM2374200.