Sir Joseph Cook (7 December 1860 – 30 July 1947) was an Australian politician and trade unionist who served as the sixth prime minister of Australia from 1913 to 1914. He held office as the leader of
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 0x4320edc055e9522935ca14b6a28b4390aef77512980d552a8a660569f20092ba. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/331bf28b-3aa5-4b7b-a19f-41b7f7b9cd82.json and https://artists.proofprofile.net/proofs/artist/331bf28b-3aa5-4b7b-a19f-41b7f7b9cd82.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ae3f73f1d04e53422b142b6ca7a24d3e4f21c9926424fc9a465786ed5497754. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZS632579991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x177b2bbf5b409e7c1396250a6994a1b25daee20852c29c58819d3c912139ec30. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZMHM2528492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ad7b93af727d372ab1b8962d26891a3d52ad8946234443cdebbea62a5eb6bef. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T18:01:44Z), 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/QZMHM2549370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6eb2abe777fb6f87e331b505f8f723259ff18bc4e77308aab10a1689227ab8b8. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/QZMHP2547989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7203b0c7bf6db9d363d5ebf86ecbb3377af718568d4feb3ed64883ed904277d7. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZMHK2525130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76d61b5b5b1ee81ee95439a7911bdf194de673bca3bcbad11c8fd0f0bbe89adc. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/QZS632535716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a38a5b906007585365f37d28826002aced863cf857dbc4b8ca577cfb901a44d. 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/QZMHK2536150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa9c6dff69da0640a0b2a2af6bdd9cb71ed4536ae5efd060da3cc981096e782b. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZMHL2533246.