Hard Stuff were an English hard rock group which included John Du Cann and Paul Hammond, formerly of Atomic Rooster. Also in the line-up were vocalist Harry 'Al' Shaw, formerly of Curiosity Shoppe and
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 0xed3f6d0ed27ff95e642b0f398c946525cdd030f51ef87222eb597b8d92ac9c90. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/805b535f-2f57-4578-8a5d-d9252badcd04.json and https://artists.proofprofile.net/proofs/artist/805b535f-2f57-4578-8a5d-d9252badcd04.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x0e0a867f80c83f160701f7810fd6eb7910f78f2afcf655340872f66c982aef7f. Chain 2 (Bitcoin): anchored in block 957624 (2026-07-11T23:13:54Z), 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/QMFME1546564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e4eb79676963d6551031587c3d5c108ac5490a9aa8cf2c12642f6df1ee3a2e7. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QMFME1546565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f220dd66df8a3618b6f6587ff973e73a50e5c5d209bd3d404e67fcebc6ea956. Chain 2 (Bitcoin): anchored in block 957620 (2026-07-11T22:32:56Z), 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/QMFME1546566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69608c9ebc9ec57e03004fbfe4a0b70110b37e0e7c6dbdbdad45b9c092e1ad99. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QMFME1546567.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cc5ef52a7e604b1bf9bc72e7c7d7c53917fc8c0fbee84a3fd1b28a0a1113a6a. Chain 2 (Bitcoin): anchored in block 958691 (2026-07-19T07:19:31Z), 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/QMFME1546568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fa6245c99a16ace704be00cff2c239a7b8cf6216cfdb8f343291012c71104b0. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QMFME1546569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98e14a89d3ae729b3b51ff49bac5ea8b2d8fc860b3b23dd6347cb86d474203a7. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QMFME1546570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fee98255df16c51bf766a6d746d1388db07c3fe4efd2a18f3bb4ebd5ad81727. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QMFME1546571.
The Complete Purple Records Anthology 1971-1973