Unit 4 + 2 were a British pop band formed in Hertfordshire, England, who had a number one hit on the UK Singles Chart in 1965 with the song "Concrete and Clay". The track topped the UK chart for one w
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbc3a97c97173c54f2e87218fed0ca8291c3e2d8f0188a14dcb87aac8e481cb9. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ff6ef3ce-80eb-4df5-96b8-b76498749dc7.json and https://artists.proofprofile.net/proofs/artist/ff6ef3ce-80eb-4df5-96b8-b76498749dc7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Best of Unit Four Plus Two, Deluxe Edition
Concrete And Clay/You've Never Been In Love Like This Before
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96b7a92c7dddfcdc09c2491946af32576fc1cd87da10860bdd0699a3901f39af. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/NLB120600156.
Concrete and Clay / (You've) Never Been in Love Like This Before - Single
(You've) Never Been in Love Like This Before
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9a2ad599cba1f815f788f704798878a9ef62958711ec8c87db73abeee01dae. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/AU6G01300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d46c34952e775afe257378b1a934e6d5222727dba16f0e58479b9653619426. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLB120600153.