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
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf738bf803daac3b9aaf113ffa31ab17cab9d6d2d7120f2c928bd7d024ad7f514. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ITS782200163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b62c7fcd7faa57a93d353e4c512f445c88edfb145beb10b46e86ae9600a877. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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 953536 (2026-06-13T17:25:41Z), 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/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 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/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 953536 (2026-06-13T17:25:41Z), 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/ITS782300258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84f80df3e177d3eaa6d0f8c93816ba255e9d3626a70e50cd3cb6364aec5f875. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/ITS782300162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f3504733c9b9fac5f48b5013e9e60fa04aceda96c9e40d70e9af944098b2b1b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/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 0x7c06882058c8a773c3238da4401f9eacc6026cdbab7c24aea271cdd73a99f993. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ITS782401519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c6ea60070af305a2637483c4b38387e01c19d0b829fd4d0fc915c4d95430c82. 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/ITS782401521.
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 0xf535d34ff21698e805cab8d8ac31c14587107ab83472938ef579c77d0cad0371. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/ITS782000465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7697895dc7b3074164320e96a272144b7512bf66f224fe4debe28656b8f0b20. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/ITS782000466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x083f95039e4b906a1ac146083b1fc9172cbdd445e9f25c8a62b8fe7a6d381cb2. 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/ITS782000469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4479391be0d16438125ec0fef8d1bff6c97eb6471d5544498dc0bad49666f757. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/ITS782000470.
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 0x7c06882058c8a773c3238da4401f9eacc6026cdbab7c24aea271cdd73a99f993. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/ITS782401519.
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 0x204cfb60376dc263338c88b6bc46485e637cbd3131b8f00ddbd7ed2eb8cab689. 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/ITS782300899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84f80df3e177d3eaa6d0f8c93816ba255e9d3626a70e50cd3cb6364aec5f875. 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/ITS782300162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf535d34ff21698e805cab8d8ac31c14587107ab83472938ef579c77d0cad0371. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/ITS782000465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd75949e56143aa37c325d6862dfc483730402bd9b699ff1f242a78e92c51132b. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/ITS782000476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb152b951ecba3fca473f2d3a9e1635f9dfb34ed8c36405accdb01d5bc1e3ff7. 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/ITS782000478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67797b84432da100aba1eb5f3c7226a2d4e9403133a147c38f3f1b173ee4e9e8. 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/ITS782000480.
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 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/ITS782300895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe7a7d75ba59dca51357bdbfd60b327692d77e6ba0dc3d619a7510a4fad14fb7. 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/ITS782300905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00768e6bc2bbbfac4a0b902ad246b64fff0ab5d69ee2ac01d4a3a90276259da7. 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/ITS782300907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6adef51b99f2b0e9bea51da0eaeec0c4a1b59f5d2b78e555d13406d114de48d. 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/ITS782300897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b61d46d9b2840cfd8f21ab56a9552c728d15728e6809c6b2b1a54f566ef03e6. 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/ITS782300917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa8165e82221f0f593bbedd642de393e38b1a4ea2fe63739b6cce4a362eb937. 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/ITS782300919.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x204cfb60376dc263338c88b6bc46485e637cbd3131b8f00ddbd7ed2eb8cab689. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/ITS782300899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd826017ba3b0fc49ea05aa8750379db64ad04b925b8c5ae4cc95ebae420699d5. 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/ITS782300901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d42c2068a1aaa8d86f5f1aa8a4ec5e6853b59d2c5ff637181e666136372b59. 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/ITS782300903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b04a6dc0410956ef96036dc242aed923744e0bb88220a212493a1bfc977f35. 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/ITS782300909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3895b752635ecd66410e5e483fd6a6d94d755e27b81cc50b1c56a19f118a94. 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/ITS782300911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf65dd98f6d3df61b8335ce30ad72123d410434768cb3299fefaff5945882430f. 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/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.