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 0x34ea56e758f463a344fe3b5130382b8124ba83d82117be2c74b59c7781950c86. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3bf2413a-d58d-4b62-8c18-598365e46a55.json and https://artists.proofprofile.net/proofs/artist/3bf2413a-d58d-4b62-8c18-598365e46a55.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Lucia di Lammermoor / Act 1: Preludio - "Percorrete le spiaggie vicine"
Chorus of the Royal Opera House, Covent Garden
Orchestra of the Royal Opera House, Covent Garden
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 0xf2c3c3240b33fa5e9427a6e2565c0baf97200989a798ccf9615d4e94950fc3bc. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF077130501 — a six-check JSON result.
Lucia di Lammermoor / Act 1: "Tu sei turbato!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2997061de0e3836a434bb4d8faaa7ac3a2f44f3d42a07aecd1268563b2434a06. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBF077130502 — a six-check JSON result.
Lucia di Lammermoor / Act 1: "Cruda, funesta smania"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x479ef2071a7c38da621c045272708faf69964f350ce28832eda0676bfffd71a5. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GBF077130503 — a six-check JSON result.
Lucia di Lammermoor / Act 2: "Lucia, fra poco a te verrà"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9a94b31c860053d91c41569d7b00e38d776ff1861c231a09d1ef152f25f191. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077130511 — a six-check JSON result.
Lucia di Lammermoor / Act 3: "Ohimè! sorge il tremendo fantasma"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x624e62eb12c5f88aac0e82c2d06d12250e373153ebbe04e6dd9bb78ab9222ed3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBF077130529 — a six-check JSON result.
Lucia di Lammermoor / Act 3: "Si tragga altrove"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c37c1fc96008da99119e62ada76f47281e373487fef37d18bd205febd04748. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/GBF077130532 — a six-check JSON result.
La traviata / Act 1: "Dell'invito trascorsa è già l'ora"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3fe23ad97ecbb6fd5e5217d0ac4ca6491cd7c29508ffc4023690c9bba1fe9884. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBF076841702 — a six-check JSON result.
La traviata / Act 1: "Un dì felice, eterea...Si ridesta in ciel l'aurora"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x945fcda3e354c11512f02e7ecfee66407c67daf3d0d48f4577fb3a3c37915ed4. 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/GBF076841705 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd47825efb01bdba20f8f12e1ea61aa1cf8b407c075238f577695be0b193d61dc. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF077230806 — a six-check JSON result.
Turandot / Act 1: Fermo! Che fai? T'arresta
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bfea038f991f609eace1902843fdc23318e6db73b6dc79875337c344a3216d. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF077230807 — a six-check JSON result.
Turandot, Act I: Non piangere, Liù! – Ah! Per l'ultima volta!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd27fbda005b5fa18fc652fcdc17b26a6b983b50cc2a74b14c8febdc61647c82. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBF077230810 — a six-check JSON result.
Turandot / Act 2: "Olà, Pang! Olà, Pong!"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf987093568914eb684edf23fa363e0d179504cdc8d713c3cd072a46e2ac0af. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF077230812 — a six-check JSON result.
Turandot / Act 2: Ho una casa nell'Honan
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82155d3b0c134615d577f482391215cde4ce9ec1860b752c8818fad84cfb1ba2. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF077230813 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x010eb1ece4ecd8e951705031a21acb3fa3daee42b1c4e6803c74b4fac56c912b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBF077230814 — a six-check JSON result.