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 0x3df604a13262454fc9d125faf2e9aa715e8a26a132920a3227f7b8641ea4a790. 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/d2136328-2acf-40af-9d85-1d7046029d91.json and https://artists.proofprofile.net/proofs/artist/d2136328-2acf-40af-9d85-1d7046029d91.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 0x0d2acb10098c954897b49c94e6765f8429e50700e595c8aa9e9375e13c247d6d. 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/QMBZ91593394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48979fd3e62e416411052200bfc12fdbb8ba0e3da379e8e2ee1a80f6e07462e6. 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/QMBZ91593395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0af44c388f9b633685f08665ec068208274befe8cefb5c6c0dd9926eb99d93a0. 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/ARF840700509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0c6e103741cbb58c22a24c4445d5f0b9afdcdd6123d66cc2f7eda083f2a0355. 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/ARF840700510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bd41da0485ebef7bba087714fc5bd93889e51e210e6b2cdae694e6b77eb6ddd. 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/ARF040500586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ddac4418bf505f86ecf335bc17a9c05bd1ba45f072c7a93f311b39a87098429. 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/ARF040500589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d533d671226ac00183b52d76b527750f38c73d26fcdc34754e8985c8aafd8cd. 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/ARF040500590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb46e742096199706594734abee76fd5ba39572fd2c4e4759983ba6bee01b6a. 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/ARF040500592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2331a803c6cb7fdafa53edaf3ed4e9fe695e6d0ca6f3bd4b920e9b0e4d0e85cf. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/MXB552300026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf58a126ec5e7c5461db7a411eea42102ee8d3573ec765c1c135dc0395cb7f97f. 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/MX1680800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8955163cc6ee061f529df91bd702f6e2751a294f7088b2d31870050e93d0eaf5. 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/MXF060800051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137142f41eae292a65dd727a9480e1e577226aede1ab939232e696381145c869. 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/MXF060800083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d8a18db3bf85ecaba31e6d1ba2a286d30277a56630868fa68c42efa93b6cbd. 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/MXF060800114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4ab776c37d48646fd9d9fe39d8392e622178b9e6157ec459a7a042e5250cd3. 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/MXF060800214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45c18b029a06f5b1eaf14ac261e25c9372cd5010a26af27f8f262dfe6e115b3b. 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/MXF060800258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x404a2dd169c7dae02ea19803acf15a30362c21ef00fe895b8f8a573f0576e132. 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/MXF060800273.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5eefae306de204e58d90ae82ccc786a57fffaabf104921cea88ebc411f7a742e. 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/AR6B52400082.