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 0xb45b26964ad1b2b9bd3a9d9faea4448f9a2bbbf49a17e98c4dec083600fbc20a. Chain 2 (Bitcoin): anchored in block 953895 (2026-06-16T05:46:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0fe4e71b-868c-4af6-86b2-1c70b3d295d2.json and https://artists.proofprofile.net/proofs/artist/0fe4e71b-868c-4af6-86b2-1c70b3d295d2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
War Requiem, Op. 66: I. Requiem aeternam: a. Requiem aeternam - 2023 Remastered Version
Britten: War Requiem (2023 Remastered Version)
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 0x8229d5c9444ed0ad7b79b53b8a1be82d56b1f804b595c6948288f7dbcc756a43. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/GBBBC2300943.
War Requiem, Op. 66: III. Offertorium: a. Domine Jesu Christe - 2023 Remastered Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x274851c487c30f0dc8590f938eb96de441845694a7611b786a157b5f97728afc. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/GBBBC2300954.
War Requiem, Op. 66: III. Offertorium: b. So Abram Rose, and Clave the Wood - 2023 Remastered Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x473fc56800b50e4fc7087db6958274825ae0bee27baaca08787f36f0e5358d7e. 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/GBBBC2300955.
War Requiem, Op. 66: VI. Libera me: c. Let Us Sleep Now...In Paradisum - 2023 Remastered Version
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2deb51391b21c1e418624a3a80451ec10dfcc5b9dcaa211f161184197f70df7e. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBBBC2300961.