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 0x7c66ce835051614e2f3f55417b9dbe30cbd8e20a7eef0fb94a4bc579b0e9b6a5. 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/5077bd64-a76f-4735-a07e-b1c604180e1e.json and https://artists.proofprofile.net/proofs/artist/5077bd64-a76f-4735-a07e-b1c604180e1e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0x9821284ff4225695115dfd5e9a60bd18d37cd1ee0d8953f4cefd95be0e8c6ad4. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/EEHA11910901 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb09ae27a86d8d56fb0486a04af2d6de2d8040a78960e57b7c864cdbef4c83fd. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/EEHA11910903 — a six-check JSON result.
Rowland (Lord Willoughby's Welcome Home) [Arr. for chromatic kannel by Anna-Liisa Eller]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35460bc91ff505c3a3a5a74e988cdc87bf7910b37779bd353253a288951168ee. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1906010 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7fb126be2857b027f96d5c3696e564f9b37bafe29503ecc6a37e13afacde20. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1906020 — a six-check JSON result.
Lachrimae (Arr. for chromatic kannel by Anna-Liisa Eller)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b37e416da02396a3ca68ca719c9e3f913ee510e59e5a059b4a3b97926631af. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1906030 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f871f03b4fc5384451c7fecb3148de8a0e0cee1e66d162d15b8e00755c2c0be. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1906040 — a six-check JSON result.
[Unmeasured] Prelude in D Minor (Arr. for chromatic kannel by Anna-Liisa Eller)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x579b0f6c74488dc8374be2d66687e646f58ec2b3ad865d7dda06ba37a4420a05. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1906050 — a six-check JSON result.
Dame, vostre doulz viaire (Arr. for psaltery by Anna-Liisa Eller)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a41c95dd865cee65d41c73a4dc6b4435c0987114135c3743544fe811a77117d. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1906060 — a six-check JSON result.
Premier livre de pièces pour clavecin: 1. Prélude (Arr. for chromatic kannel by Anna-Liisa Eller)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdeb7dae17cc5133bd0c8ef8606758907cf85a126ac82bfcbe3d5ae98badae39. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1906070 — a six-check JSON result.
Premier livre de pièces pour clavecin: 2. Allemande (Arr. for chromatic kannel by Anna-Liisa Eller)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e81d6270fd11cb782c3698223ac00f75b02521236ffdc41e0b4f1391c27c583. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1906080 — a six-check JSON result.
Tombeau sur la mort de Mr. Comte de Logy (Arr. for chromatic kannel by Anna-Liisa Eller)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f763a2bee645e000b9c2e71e12888d33a8e9a81454a04c9b071e0fdef59b191. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1906090 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb987d947a8f8a42e8161bf4ed9dc491db357d7bd6b1b036601de9f6dd29a8748. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1906100 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8960fee7d2eec6b3efc070a63d4ab15935d43062d418fe7d7e723729c55e186c. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1906110 — a six-check JSON result.
Suite in D Major: 6. L'Entretien des Muses (Arr. for chromatic kannel by Anna-Liisa Eller)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x407850156bf98c50f68b74220a50d925b6b4777e34a9a33771bebe1b8e96ef99. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM1906140 — a six-check JSON result.