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 0x5b0cd5c033eebfdcd03333087af1a5352141964443e1b0c119f61d98defcc360. 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/2a8a98b0-f1f2-45df-b306-cd39b556f818.json and https://artists.proofprofile.net/proofs/artist/2a8a98b0-f1f2-45df-b306-cd39b556f818.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 0xcccca2481ed368bd125c4e29db9cd9092c4d9361a354244f0cb12e9f69bbf72a. 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/ARF039600897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa90a59ab6382da5142f092a4c230a2c8233b934fc01905b418c363053509dc21. 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/ARF037000209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa52f98c0439058e4fa4d5faf53f37dd7b03c867facd3bde85432359041be024b. 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/ARF037100146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcccca2481ed368bd125c4e29db9cd9092c4d9361a354244f0cb12e9f69bbf72a. 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/ARF039600897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a53f27dd3106124e0b51523957e19e21b46800303ce511e104222fd918fa3ad. 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/ARF037200139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680017628ba40580a48ff8ff44d65a7d5152a1697b9de1c13b5137d29be8ba02. 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/ARF039701132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680017628ba40580a48ff8ff44d65a7d5152a1697b9de1c13b5137d29be8ba02. 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/ARF039701132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd625e1338baa12ecb7acc078bec6a6152b577b2cb7c9cfe87e3893664a587d. 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/ARF037400043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a135976f76a8cef84bd850b925f827478c7c81fab92e004f59efaa02b45e2a9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/ARF037700025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ae211da1356625a79766dd9f38132cc61df9a11f3d2693d847707f4346af30c. 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/ARF037600036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b5277dc7c7c48b08b8bf6007f2dbfe96afccb20a0e676529ec100c6dd60cf33. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/ARF037100130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70149bba615e7d5c55d72a862ef8c79411b362ac59a3d829926591d17aa861f5. 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/ARF037300046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c25eaa9b4c4feb8467b68715140cfc8b1be8fa0a8322698013bea5a97e8ab59. 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/ARF039901460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b51d8b7e8d122bd433758a52722a6c05ba4f96456ab3364c8e8810f53ee473. 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/ARF036800013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680017628ba40580a48ff8ff44d65a7d5152a1697b9de1c13b5137d29be8ba02. 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/ARF039701132.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe128963683a2c812d0c126929f7aa1846ebde207f2464fbbb5d5097e8935a38b. 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/ARF109900510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66ce6cd690bb728111dc23c03f18f0cc76f04c3223e39c4405aab0805ab16e9f. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/QM6MZ2274567.