Cornelius Cardew (7 May 193613 December 1981) was an English experimental music composer, and founder (with Howard Skempton and Michael Parsons) of the Scratch Orchestra, an experimental performing en
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 0x97198f20a33484bdb5b4893089142aac8e62494985bbe2aee26ff477874fa7cb. Chain 2 (Bitcoin): anchored in block 954124 (2026-06-17T18:22:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7c023c38-9cfa-4d59-a9d8-45796433f4de.json and https://artists.proofprofile.net/proofs/artist/7c023c38-9cfa-4d59-a9d8-45796433f4de.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Cornelius Cardew: The Great Treatise Serves
Die Abflussrohre spuckten ihre Eisblöcke wie abgelutschte Bonbons auf den Gehsteig
Ives: Die vier Sonaten für Violine und Klavier
We Sing for the Futur: Thälmann Variations
Cardew: The Great Learning / Bedford: Two Poems For Chorus On Words
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 0xcc19ae4d38fa3d1902c471903ab4ef1edb34c6411696abafb485aab7e1c238d2. 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/DEF057103570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a5da044edc9f7bfe6aca3a84cc23366a78109cc3ab60772fb7a7cdacbe37bf. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057103580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9881f6b84eb1a5269e03d43c02a66f190c36e028c24bdee225479f142cea5fb7. 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/DEF056801460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94261b9b75d0ba87c29dde16ea3064cf24d0916277fc0df72f73d7f37c512485. 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/ITK197500079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92ed9c8549b3fe54bf970e171d3c85c988b19d33b795672073d1c3cdc2a45bba. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITK197500080.
Sailing the Seas Depends on the Helmsman
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3bf0a2d10d35c0881ce1c80c690bf86918651ce309aebe5266f9caedd6ba567. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITK197500084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3f76601ac4616aa99d31805e4e0c2accafadf3e9e43e389491732c27bbf1217. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF057403195.