Cyril Chambers CBE (1897–1975) was an Australian politician who served as a member of the House of Representatives from 1943 to 1958, representing the Labor Party. He was Minister for the Army in the
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 0x28479a1ae02d7761b6853ff23fcfeda44874c292e6aeb5fe28cf28351c03d371. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2a57b5d2-4bf2-4312-a423-cab5a6f554fe.json and https://artists.proofprofile.net/proofs/artist/2a57b5d2-4bf2-4312-a423-cab5a6f554fe.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 0xb045eaae09a34d01fcbb275463792923cd84387053e2c49fc9bf7a16ffd85aba. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/GBSMU4069029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa14b8afbf46626c18a41ff28b547eefe15c55922b1da1f40b053f828cda3dff2. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/GBSMU4069030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59142bbfd180dae170493ffd721f1dd0ce6ec76f501bf4739af6f7ccc314360f. Chain 2 (Bitcoin): anchored in block 958617 (2026-07-18T22:07:13Z), 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/GBSMU4069032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531ec3bc4bf110cb9c21db6cd8fad899cdb1cb513418ddb01c078bbd4e334e22. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/GBSMU4069033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d2a8e01919fb862ef2628fccc9bdeffd1ed6563decfa6160f79599a4b0a510. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GBSMU4069034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a569b5bb38a912e4c2289b707ab8a06c9c3585b126f98f40473bc81c8177a21. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/GBSMU4069036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1fbf5825e5eab2d6245b2e3c773611aa2077dd9a1cacacd14486da2761698e6. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/GBSMU4069039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe15539d601361e15311eb562455ff4c743ea6b9e5a28be114a553bfb7bbe7a16. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/GBSMU4069040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dd95671de5d2a694357dac45bbb6acf02786b7018cdf47a1fb2561c31c8b734. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/GBSMU4069041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa269a043b0e5a7661908ed979da43ade1b721f3cd651209788511266f18ca6f9. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GBSMU4068207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50fbf2dd7a72820691f8a19e5cb9938846775c441b549159b932f2c1ad081f97. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/GBSMU4068208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf945db20f62b81c957491d207c6fefcb4c9c413253df801b6624e8ad1242d0a. 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/GBSMU4068210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc33f961fd26f9aa0101b2a8b6ce40f8f7afd59f228a45732435eddf9f8fe7c2f. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/GBSMU4068099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe7ea0b72214889169edd56243bb57450a3d0a3823018e34471c92b518d704f5. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/GBSMU4068105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f542b56b03bfc149bd27e95fa2c8fb60b244c8ab578928d938ebc0b2cc1587b. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/GBSMU4068106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04584cce57ce4b33d5f712bdd39fc6c36a430bd02d32d99f4000d6256ed41c6c. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBSMU4068109.