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 0x0c21728be9032ff7b12ae75563603489e1c8e9031444867823422f60e2ff04f0. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a289d58a-a6f9-4c47-9913-f69c3940c372.json and https://artists.proofprofile.net/proofs/artist/a289d58a-a6f9-4c47-9913-f69c3940c372.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 0x002cf34735798a60e0bd0005349c987e0205d59433d8428200819fc69b064c47. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZA3V1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46085a0b473ada4ab1164b62a9dd8f20d4ab27d8d64a284fb5c95ce0db53b688. 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/QZA3V1700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x077aaf4fb61ebea01aafe7a90181a00f949185fb72d52fd62ed14a2e8d97a44e. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZA3V1700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b402d8851d68c13107496a99d53ddc7ee50c1b9d8cbe2fa452b4c2539b9fd65. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZA3V1700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b94a2899abc7cfb37cdd309c14ce77d424bc09ef6fbba0b71af8f69b054ee64. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZA3V1700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1d3cd58d46a3a054e2f1c24cd896c968a907aab8d5206a7decc7942ce9ef37d. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/QZA3V1700006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x825834b6ed590f312486a41c40eba0534790e8803b3d0a853255d915050e8977. 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/QZA3V1700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe36ac424e8fef1594d82701e3cd05a5a7d04305979fcbfe9e5ae0743c5776c51. 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/QZA3V1700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88bf26b30fef6c3836d6d72365e82fa2d8ceee81ff532bc38b4efc73bf8cd54a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/TCADI1700387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3b88f063332b5d1ce7325890ba9dcbfda50cb85b654977b036ac8051b5d75f4. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/QZA3V1700011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95cf90f9ac178496ac21b8f1a56d84817d816c4b409f263719876ed903a6c084. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/QZA3V1700010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99cbceb3ae40ffe0f3665268cba1863336371fed6dba79caaf8bab99af98ebb7. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZA3V1700012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4314bc093f793c0e49a63e2044ea3ebef4f9fdb3b17bd2c1273e08640278d3. 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/US8JA2430001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9db39657f6d22c9b2f1bf30707e4a6c9103dd7e678d1ba8e6667053cb0144c49. 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/USDY42038273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a474953b74071b552fc8a34e4cea25e9e3bcfdcc3ce8f7eb01b19bde29b124. 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/USX9P2005811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5ce3e52e3e516aeae54b3a8d3e4d6ffbe03bf6b48ae1f5a020751d1779d262c. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZ5FN2119798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63898e63aecf5ad0a22638d919defdd47615e71d483361e34c7ad820e0861ec. 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/QZ5FN2119803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38bcf061cc18081cee4126733eaab5433a3d16700a8f80003275d8985ca11623. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZ5FN2119813.