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 0xf7c9af8601bc1b4e06f07921679b4ac2f0dc58bb868a941c34a567a58f5144a3. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c324a2cf-8278-4955-b4ee-510995a3cda4.json and https://artists.proofprofile.net/proofs/artist/c324a2cf-8278-4955-b4ee-510995a3cda4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rodrigo / Arr. Carradot: Concierto de Aranjuez: II. Adagio (Excerpt)
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 0xb579fe0f31c44d8ade3b7cd4113340aff59f94452646008971a69ad8774cd91a. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/GBAYC8301042.
Legrand / Arr. Astier: Les parapluies de Cherbourg
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9787883736f37ff07cd0299ba965b721bbe883e716615a1535464b3e515366e6. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBAYC8301043.
Dvořák / Arr. Carradot: Symphony No. 9 in E Minor, Op. 95, B. 178 "From the New World": II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x099994bcbc033c13c5a7c8d1e1f27150ccde3398045e5be219d16830c2ee24f8. 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/GBAYC8301036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf9d3dd3f5857bed7c5210e3133395ac46cce9056b630809604d721d4d3e909. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GBAYC8300497.
Kern / Arr. Carradot: Show Boat, Act 1: "Old Man River"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12dbe72f5e60d44d3db8f8f36148d05ef27c27c2aed9ac53621593ac52102b1. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/GBAYC8301039.
Massenet / Arr. Carradot: Thaïs, Act 2: Méditation. Andante religioso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb22a160e9a4e523644b475511937640a77ca58d721311e4ac475314d1ea950c5. 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/GBAYC8301040.
Rimsky-Korsakov / Arr. Carradot: The Tale of Tsar Saltan, Act 3: Flight of the Bumblebee
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa95bce567c3461130a6dc33985cf7b49fdbe5b5853e6f49ac9a02294986d873. 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/GBAYC8300501.