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 0x667e744a367594e1d8cc25835b9f3a0b5ef022bd52f5ac9804271c47c3661a2d. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2de23de8-ea89-4720-8665-6f68497f815b.json and https://artists.proofprofile.net/proofs/artist/2de23de8-ea89-4720-8665-6f68497f815b.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 0xf2bbaa1047db2b9040291a0772ea8e61ea9a34582553044c42f3c97debe3a726. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/SE6I32364755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2bbaa1047db2b9040291a0772ea8e61ea9a34582553044c42f3c97debe3a726. 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/SE6I32364755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9477f14c07e947b0aa78d726d0b0124db1b3cb52a65bc5621d3011e4ed943bd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFYY2458922.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3a2b1b0077c9786a26e76321fef8317bf54aeb168b3b828821d7873e3f82cee. 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/SE6SA2394987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8bb5c055e1f81fdc9b87eb3b438c401a5456c9593f93c6aac994765bee476b. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/SE5752359855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb11e9b17e29f928c2b571fb9a5e5cd51208cfaf9405fd6981535e076d6b9a9a4. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZFYY2458923.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61a2ccc5760e9009f256520b826a3d74af83acbeaa86548cec4eab63bd3125ff. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFYY2458925.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x858a769f09d227e10a3d1c9771a0ae538ad283b0872d3cc93610972b24b8e0e8. 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/QZTBD2317914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdffb8036f9ef8189647bb37769db9738338040f357590f07a8b04163975be7bc. 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/QZTB32394969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ab42453f26b6b94c96da060a715cefad1ee68bdc9bfc4e87e57e6ab8b4742be. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/QZNWX2401516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b3efd1e21cd674094fcd611d32a8fe0cbd81b27bec786a5b45581af390e3a5. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZWFF2457092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7de3c387237a192efb026b33dbd1f11c35338ec9f04add0e926c66e3299547c3. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZZ7K2458886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95abeecfeff50ea4975ea407b3b1b80a261e1b4a6ed51002421084f08454d717. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZDA62563960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d242796cc5d49fdb0c7078917e1d26b7c8f715b7be2d1abe02978ffa9c10cd. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/SE6XW2219534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1b3efd1e21cd674094fcd611d32a8fe0cbd81b27bec786a5b45581af390e3a5. 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/QZWFF2457092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x343db9412abc92665b65bd17b6f1079e481a25379eb60b80fd7334977f4276aa. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZTAS2513940.