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 0xc29e5121e9f729798567a345671f238796075067dd64395d8d918d4e1085c377. Chain 2 (Bitcoin): anchored in block 953596 (2026-06-14T06:21:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0b2f0394-fccc-42a1-844e-6c3863178f99.json and https://artists.proofprofile.net/proofs/artist/0b2f0394-fccc-42a1-844e-6c3863178f99.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 0x89bf16499c3004dd540e189fefbc7fd6b7d19c213057786147246c0f443ef8e4. Chain 2 (Bitcoin): anchored in block 958991 (2026-07-21T10:04:40Z), 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/QZRP52471435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33a2d93dd8e7609bb7c8a78de39effddb2d37e8159f6113a10f3e458a4db4574. 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/QZRP52471436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ae0edd26927cd05fa1003d00f2ae72b37350a99cd5a5bf600df3c5334b9ac64. 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/QZRP52471437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86d3a6d09a1c50e6201a8b50cab45f30897d034681454a8cee2f7305b0d0d3d8. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/QZRP52471438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56968270b9be1ab3950ac455bedd2a5639a90ffbd447ad0de033b30adf565422. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/QZRP52471439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d849b30d25b96b2a79a663afbc8554e709743f7e7e9876507f9251853712ae0. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/QZRP52471440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x221391aa20b494fa29e03295445298d246d1a7267a473aa32d79fa2293e7c69e. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZRP52471442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd08a1452ac41aecf82aa405ca345ed0fbffe4b24290ce638070d0b690ba688e. 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/QZRP52471444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc88e08ac9c01037f5ac57bf3e6ac4889e2218f4215275ab3c939a8c110730bbb. 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/QZRP52471446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85f7a31348c46f4f3a3bb9c4e94ae0c7b9089c51ce54d2930a829df7339f7d94. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZRP52471448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ecd923ebffc08bca5f07643875b71bd0041785a3345e328d5ed9c25ad37623. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/QZRP52471450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x961a9eb07c90994d473d3663311b0de56f832ce3d2cca13849839a6a2a397fb8. 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/QZRP52471452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ccc05475c2cc4d33841fa32a1c7325909b9d7ac0d6c0d675df479bc03d6985. Chain 2 (Bitcoin): anchored in block 958734 (2026-07-19T12:54:58Z), 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/QZRP52471454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed5dcf53a497edff3b9c5a35c407fe50c64367bab301bf291eb6019a23d413f. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZRP52471456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb64fab3149171ecb4849f54469cd28aeddcd0406f8207bb3082624ba55b3e88b. 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/QZRP52471458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82f86cc719fe10e9aa7b8b73a0b7c2a5172a634c8b889f26129f9a414e31eb28. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/QZRP52471460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe01ea77e6f90ad917b2335a7cc624beb8e2cc16fe3b05d86ee60b926b5edcace. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZRP52471462.