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 0x4975e548afdd59daef8e08da19fc7e9d1e13d44129e26b094fdaa08cf7e6647b. 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/76e11d74-da78-4fae-b16e-fcc6849a55fa.json and https://artists.proofprofile.net/proofs/artist/76e11d74-da78-4fae-b16e-fcc6849a55fa.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 0x7a4ffa08bb1443a45325a19c1c0ee7b42d6cce6dfa29724aceee456f0fcf4d00. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/NLA329717649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f09a41a63b98fdddafa6da4a36001238d23b46a5bcc6dae4d7270c28b96fa4c. 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/NLA329717546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca322338c120d1a3fbf25f4090ea05350925387330f9477b363e66e60cfd667d. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/NLA329717650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d13fbfa4eaec01b033d6d700013ce3f7a68c8561188e46aea01c144566bf52. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NLA329717653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0aa5ff67c6ce4fe84fbf311c17829eb8c160085af9908826d35c7c8e4a0056f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLA329617338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaf9db0e52d3f76b446fbf93dec7fa10c71800609c03ac68472a2789e528ad60. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/NLA329717654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00c84cebaaef21ead7cb1781ede7b5b4e240782482c8f96c707a6deb54a5bfdd. 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/NLA329717630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fb879e67f1aab7688aa56eb1c2f948aaddd3a27cef3614cbf2f3922b2e90a21. 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/NLA329717655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38db9acd2ad439af15f1a079d76672afaadefe43d6eb1c9601e6d0e5f02341b7. 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/NLA329717656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9490b0c410eae931673c2b36809a066a213ac245e168287d80d552428315e70. 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/NLA329717657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c826a3294ddf52d7c1fe9794a2c919056f48c72e94d5411d6aec17807df7201. 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/NLA329717658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fee631386752d78ee30b435fbd13739ca7bc9f03a8d552fbd898903832eb71a. 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/NLA329717659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2074f5026ba296a7243f5fee390c43007cd4db96a3ea5b89e63bce1230d451f8. 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/NLA329717660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0127e7930c66affb259efaa0aba85083956606d3800022bb4ae0d36aab626c1. 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/NLA329717661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef320f9840dd63ecfe5abd44dcf9fe8b4e61d950648ab0a9dd50db70d1c684e7. 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/NLA329717662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81ff4c24d792fbabf7bea868c6a0c42ee8619f1927517ba1112e79d6c730b7bf. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLA329717545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f78397dbafa5c2becdae6ba1aff39bb702db0337e337b87f111f2b87659cb28. 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/NLA329717663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c044a7bcc782af3e5a1e24ec54231bd55e04952f9f654e18ce964d19b33abb. 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/NLA329717664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f2c0dc46219b8ecda4fd75c64ce1b6bdbce66bf5379435758883cf94b06c80. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/NLA329717665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c277aeaf4beaba554afb54af44630df3e2fa69a1a6ec77266d5e521de501446. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/NLA329717666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d34300f991fdb1a800acb17eb1c08804326e4dd2ca6f36638e0d41b384a218. 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/NLA329717598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7bb7151f830280ac581e2e5301159e9f844cf79bd9e705cdafa208d80ec73cb. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/NLA329717667.