Marjorie Alexandra Cooper (May 28, 1902 – September 12, 1984) was an educator, civil servant, and political figure in Saskatchewan, Canada. She represented Regina City from 1952 to 1964 and Regina Wes
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 0x7a5f92a13064a0e6125232b59811ab2320fe65a38f92ad909f81aa45d6ca520c. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/12bd7519-099a-47ee-b455-50b99c9bc185.json and https://artists.proofprofile.net/proofs/artist/12bd7519-099a-47ee-b455-50b99c9bc185.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 0x9523b4e8f589d9e9e0f0e4fc84b79ee13c8909cfb266c0bcd6b5b84991930e1c. 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/QZS632504057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac627cc0a1f2bcd0de0ff2fa61895959d5c4e1603db85c4610e896cf21f50936. 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/QZMHM2570262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01b7300c68e07a5376e0bdce15b28c4f300785339335e13cb7b3136f320a8dc. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZMHL2542126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7aba96c8b2b858bdecb7308ef13ffa33d9395444c34f63f5e7a08f17492fe3f. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZMHP2586896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a40de51903a62835d026c7d6bbbc93bdcf65dc94bce9aa0d610f24ff6f28013. 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/QZS632538485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a670fdf35406e459dda5f96968b8c30076b0c059328bcefa18203c2efc8d0b3. 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/QZS632545580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ed7bb7de8435d877ea069a7b33c0f33ce4315f6793df69f2283a615cfdc2759. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/QZMHM2530365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9f435b3416a1da7834b2a60e4f9caa60aeb81df288283f87f8a1423e3d6f701. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/QM42K2507078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf636f2478275cb6d7c79c7cc39e70687ec45f7b4306ce368dee69b8d52b4dc3d. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/QZMHK2539134.