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 0x04ba8ed113f22bde92af6d5b6a06b4e18430ad6c3f6eff279f023d4a3401d493. 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/71b15480-bb1b-48fd-84fc-14189f89b822.json and https://artists.proofprofile.net/proofs/artist/71b15480-bb1b-48fd-84fc-14189f89b822.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 0x226188a7db3363f3818ae2b429a8b2d47ce139859dbc0a3473703119c3b7b75b. 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/QZS7J2346221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x674c5e9a60990004155ee402ddf56c73022a5cc92767ff52b148a0d15982053a. 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/QZS7J2344895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac995447ee9dca7e768bbc9a14fd3ce26b517c4544845354eab1b4eb844e2ac6. 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/QZS7J2304042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc1eb1dbe4a583094b2c83c56f2366aa264111c4702f93cf5c04b517ef9f956d. 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/QZNWQ2110838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb81a6161955195a26a4cc6ae8ac3a9f9fee7bed9ee10b137bf721474b96d9241. 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/QZNWQ2110842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x924492120008989e377e892929fc8b4b73ada3d65d17b7b4af97850fcae49598. 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/QZTLA2551796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7431a280a36f3b507c29d6f6e0f875ff112ceb0ef2a9e7aaaf79d56a3f8048a. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:31:46Z), 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/QZQAY2550781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x989609eed65cea44010186f30f28395ed1057c7350858f8457051bfdcbb19f0f. 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/QZS7J2395720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb91ad7cd8c1fa66e56894af08f23013de7888a03fb926e3911f68774d49a8fae. 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/QZS7J2300987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x275e9cbc232fa7ff96b9a1da345ebebf7595401cddb1d8e8440bace064e7397d. 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/QZTLA2338552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3666a9dd28d0e6320044cfab14f0c2f53ee65d976929d2d41e5796c7bdcf0a3a. 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/QZSYP2334126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe3dda8fb42d7a1f0a6c9b04727283578a8db64db8c8a873a2c75846c028ff24. 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/QZTAT2212830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1ed274151a18e73e695e9239abdce3c0fe0b3306c3980e00173c0c48cd4d67e. 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/QZRP52435945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130790cefa26e3da5a318233d76585b5e92e53b41ee72dcb77ff74b578c431a5. 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/QZTBD2413249.