thumb|The Daylight Inn, 2011 Sidney Charles Clark (1894–1962) was a British architect, chief architect for Charrington's Brewery from 1924 to 1959. Early life Sidney Charles Clark was born in 189
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 0x9f0f186c7219f7b96b4253bb690b8e6163f434e9454d54c41546f6ab73394b83. Chain 2 (Bitcoin): anchored in block 953630 (2026-06-14T12:06:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/30bb80d3-d0f0-42d2-a68c-1775abfec4d2.json and https://artists.proofprofile.net/proofs/artist/30bb80d3-d0f0-42d2-a68c-1775abfec4d2.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 0xf738bf803daac3b9aaf113ffa31ab17cab9d6d2d7120f2c928bd7d024ad7f514. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITS782200163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b62c7fcd7faa57a93d353e4c512f445c88edfb145beb10b46e86ae9600a877. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITS782200168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69e51a1862622ff331f716d6bce67d9d8d8c9ce4b96659a8b8f61d245cb77f23. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITS782300094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1d5d4b42b9825fa456daac6989264b05ef41dbea5128eebfd1738323342ee18. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITS782200165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180b297df899e0a89a2c59fa465ed09471a7cefe16800f99fdbc9d9e4e4643f0. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITS782200148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f5daed5a32a57b629574aaa98df888a84e5aea9a3d6cef1314b402dd861695. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITS782300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x162e86ac5747c1cf4de0327984072288a06625f50c1ffe86c97af597dee964d5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITS782300258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3504733c9b9fac5f48b5013e9e60fa04aceda96c9e40d70e9af944098b2b1b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ITS782300248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac914ccf38a36773f15f73549b2cdbee8acf7bc877cea6a22966fd7e2b43158. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITS782300161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8541b2b7ddb2c5bd9c60f066a034e6cc6c806adf6140929f4f11fd2b02d409f. Chain 2 (Bitcoin): anchored in block 959146 (2026-07-22T17:16:38Z), 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/ITS782000461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17cd6562fbe73d67f82a30b1b006256664964e766b322d681f46fba40b02db7c. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/ITS782000462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4b553e648fe68a458ddcc6c48d1406bd3d98b166a33e08b446e56d461650854. 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/ITS782000463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d69d3db237ec7af07d08b6cd075b6a8248ca388d4f3a00937257ed91efac94. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/ITS782000464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1af73149cab5aed7864261ecf56413b96d88d9635adeb4ff76e9b8bbf530a4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ITS782401604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87bab9d43c074cc3983c6bc899e698f61c3e49f2a4de4ec01c650a0801faed5. 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/ITS782400251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc652a750dd468a6932f19f9fb790e86812c698ae5f1f27da5775b99b198af544. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/ITS782000473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb152b951ecba3fca473f2d3a9e1635f9dfb34ed8c36405accdb01d5bc1e3ff7. 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/ITS782000478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa56e49c7e028b000447aac3ea828ae7617e8c5b4cc0513158fa259c0006fc85. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ITS782401860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf349f5e54e7eb4c28ea203ab1948a6c67d6ae210ddc5bd6a48e4afb623e0fff. 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/ITS782300895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe7a7d75ba59dca51357bdbfd60b327692d77e6ba0dc3d619a7510a4fad14fb7. 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/ITS782300905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00768e6bc2bbbfac4a0b902ad246b64fff0ab5d69ee2ac01d4a3a90276259da7. 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/ITS782300907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b61d46d9b2840cfd8f21ab56a9552c728d15728e6809c6b2b1a54f566ef03e6. 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/ITS782300917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa8165e82221f0f593bbedd642de393e38b1a4ea2fe63739b6cce4a362eb937. 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/ITS782300919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd826017ba3b0fc49ea05aa8750379db64ad04b925b8c5ae4cc95ebae420699d5. 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/ITS782300901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b04a6dc0410956ef96036dc242aed923744e0bb88220a212493a1bfc977f35. 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/ITS782300909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3895b752635ecd66410e5e483fd6a6d94d755e27b81cc50b1c56a19f118a94. 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/ITS782300911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65dd98f6d3df61b8335ce30ad72123d410434768cb3299fefaff5945882430f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ITS782300913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6933116573a47864853d65dae0dfa008793fdd4fd0c0e9790bd63f4b2d9bdf85. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ITS782300915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc99829a36ac5c494b96709bf9307e8c3d95721623d94b0e17771325343a452e. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/ITS782300921.