Eric Gordon Cunningham (April 14, 1949 – January 1, 2015) was a politician in Ontario, Canada. He was a Liberal member of the Legislative Assembly of Ontario from 1975 to 1984. Background Cunningham
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 0x63a01f8c4ece1400563b3da6c2e3ce812ca82df8020613bf269ee18869bc4319. Chain 2 (Bitcoin): anchored in block 953618 (2026-06-14T09:16:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1bb18c99-cd4c-47f7-ad98-191abb0cc037.json and https://artists.proofprofile.net/proofs/artist/1bb18c99-cd4c-47f7-ad98-191abb0cc037.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 0x1d7d5c8ccf9006b3d2dc2ecae688d85f6d39683fb63f860a0c2908ca621d05d7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QMREU9500301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3629ad6b04b41b5b5a9cb5ea2321818e3601ade48fd1f1677de1e4a984346919. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/QMREU9500302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4eaf18f72f5cdc101a85b1149b02f9adcace631b12307e0fe07536d5c1677363. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QMREU9500303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x643ed83e86c3ffccb35282d0070516478761467d594c93ba16703a03c55b1006. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QMREU9500304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b9c8314440330867b041853a28b1c006a01e831663419cb3f271489cf2788f. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/QMREU9500306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d2e0bf428eb20cd49398c0147f03fbe5cab9c75ddd34aea1f182595863e8c7b. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QMREU9500309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf69dfa34e6bbf9a81075e61b47db0d29f0448d3993a77580be82fd206eb7c8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMREU9500311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa36b4b7d701b8c86eda6d5cc5910c246631ed87700f2e1d66e346df5c24b046d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMREU9500312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7bbba02ee548db309c482f7bde86a7f2d881270ed1c47260e871fcdf4618b8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMREU9500313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f23107efa74b4f471cd4e16b3540614e4c31c769fad2b7980cc4b3f5a1a9436. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/QMREU9500314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f28f3e9205da9439873122f7893cb758021cc471d4f8a6d0234d86ac2456118. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMREU9500315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06d7283ccc8042044ccddb85a85df9494b525e1e768c71d8eb166660130c90eb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QMREU9500317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff01029107607114d6435b50e7b96ec04c73b25763750366ea61b6a4485e805. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/QMREU9500305.
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 0x2e53942e2f0576e39321fd2aea0ea32b83bf41e9db18e17c0787bcd6c3cf90de. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QMREU9500307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d05a650ff445067c880dfc6f6a3c25992be889f33b174f8ddd59488c6c84435. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QMREU9500308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf44286cc958195b486867e16d7f6dc062454447beea048aaf29cdfd1518e2b94. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/QMREU9500310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30a3e1d0d3767616f145af5335b4ef74811769daaf8a6cd6a2a9c3ac55a2a0ea. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/QMREU9500316.