David William Kilgour (February 18, 1941 – April 5, 2022) was a Canadian human rights activist, author, lawyer, and politician. He also served as a senior fellow to the Raoul Wallenberg Centre for Hu
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 0x70fad85d5db8aa1736ccb0a50516c082ce9bd28067a31fe67430be1fca71b965. 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/465cfac3-5856-49b1-b991-8b3dca0cae9f.json and https://artists.proofprofile.net/proofs/artist/465cfac3-5856-49b1-b991-8b3dca0cae9f.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 0x1caca86dbb26469cfdebc2622af380fb07172226041b3250b6342b017fbdc7f5. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/NZFN00400459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa027aa7336ec03d446afa4d379f914a06600a76a393770b5833a2e8407396680. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T22:50:27Z), 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/NZFN00400460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384064dd853384e83e57e0f2f37d004805cf886ffacbc80c135b03a8de6adf2f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NZFN00400470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7b3d429b9e40391330129f21ecc078d5c2f0fabb333e30ce276314c4466c3a6. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:01:51Z), 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/USMRG0343001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd10da5c1f1db304fa7e7a6a9f55189e2c9ea5f516c3a61868e1fa94553c919f. 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/USMRG0343002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2b5bdd6c755e8f0dbcbe07483ebbea66fc45db539f13d0a0bda7a64f64d7c4c. 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/USMRG0343005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd61da64485d0a5d0cc706884e9f6ae31102ea3c897e6b88de292fc5cb0c7c5c. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/USMRG0343006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfad372d8f1d35d0a53542366e362b82a43d74a429201a97a370f686439baa9e. Chain 2 (Bitcoin): anchored in block 957692 (2026-07-12T10:37:51Z), 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/USMRG0343008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd9125d5248840129b9061e7b9602f3be724791d611920e16e70f27fdc4514f. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/USMRG0443020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fde1d0bd0d1b0c40a5e684ea8718f2b80e3654b1922e06463b9463ff4cf1042. 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/USMRG1141901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45a18580982f48dda7c40e6d8c8fdfc76ea5dfca7c6bddd7cf1eb07400f67109. 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/USMRG1141905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8e78b477b633ea37f0fdc0d371c18e989e4b13a1dd1aabef52850e8c9f1aa88. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/USMRG1141908.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4ca032ea7b3397ed91a6674dbde83f824d3152177c732cc5a855369c0306189. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/USMRG1968803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd07235e97eea5f43dc8dc112cde224c24906cc6b6a00ecf70cdd2bcc2967a5be. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T15:59:44Z), 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/USMRG1968806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67a203a7aff7bb678f2b1cfe904a6f1b0b5dcfe5c02b74966b0d4148b197704. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USMRG1968807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b290a488239053193b339aa36a7015d887f080d844ac888298f8175216b9ff. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/USMRG1968810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3942ab6d2013aecf3972c468c91d099e842e68f206a0ca3abd3df60ef3aa764b. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/NZRH10900333.