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 0x98f5b984ddd2d51d797f7dd73550a03321b93b51ef2a352ed9f26bf79a8da97b. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6e1fef87-8c3f-4275-88f8-09827873ddc3.json and https://artists.proofprofile.net/proofs/artist/6e1fef87-8c3f-4275-88f8-09827873ddc3.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 0x9b4e2c5f274f047a2174b8232359127549bce8ffcb7fe25da6000cf4aaf7b4e5. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZDA72311419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf21bf40405ac0a01add6bdb34c48ecba1126a640b7770ac96251391ac3fdbdb4. Chain 2 (Bitcoin): anchored in block 958812 (2026-07-20T03:24:09Z), 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/QZDA72311422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaaa410eefdceef158b2e6ef9109572b2ba11152823c9ce6143723162c5468a27. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZHN52418639.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a9d18527778060ccb25ed2e5d3d46b9698dac816d756ac5e8d03290041ac55. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZTB32362619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8066828d3dca3a288f2940fd1b0082e7a83f31a13753f1102c523bf6a183b81b. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZRP52342609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4fc22638dd3b001a03f140f5214b8de42e9524f4b90b8377faeb5d14e10476e. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QZHN52418643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbec0dc8b2a4d201958ad81407e36a9705dc9df8495997327a9d00381c9f5bd5. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QT3EY2404381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a926f347491381e0d91252185736547e5c0cf3ff70837b8ab32e4a17ded7de. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QT3EY2404382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2c55955b9cf460cacb2b36aa42981efe7db076456416effbaf8aefe85b99a7. Chain 2 (Bitcoin): anchored in block 958558 (2026-07-18T13:44:16Z), 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/QT3EY2404383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1635d09242bf53bfc6e88a34d2755189172656c69dae5209d3d9376079ef618. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/QT3EY2404386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf75351e9b426b75cb0c502e6ae20223e1998cf1b65378483a8f579905e8c874e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNWU2508081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bae53e644dfb58b384aa0073b6e0f53b8b471b57b22fa4db109d19682dcdcc3. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZNWX2556847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170a6172147cb4881461b6173c5565a944765005090a328e6f8dd55c6b6536fe. 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/QZNWX2556850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03e96c97f8d13cc47907c197bbe295f4576a35316bb963b6403c4e2a1da28a8. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/QZNWX2556852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x918d47a4e7a5f253cac6e4bdc5b8d3c18f375f32b4e36334a3e1bbe98905d72d. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZTB32541410.