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 0xc525ff5b5efa6b512d87c87f3464bc1631be2390e5e517cabdafda9f1bdcfa9d. 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/6fd3138d-e055-4bf1-9bca-8ceab7c2fada.json and https://artists.proofprofile.net/proofs/artist/6fd3138d-e055-4bf1-9bca-8ceab7c2fada.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 0x3f8fca29f9051d20719f0be11b41996f5215e9831e70eb221e0ab02d5d31b3ed. 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/TCAEF1971346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92344d1cace3fcd18d2418d81108cf5fe5cad62a4ed94e7ddb0a5fdf0cd22918. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/TCACY1794992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e44e3d8ffea1a4ab9a8c369d71bd81797994d9c0c6b850476254514a088f6e. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCAEI1940989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e4dc667a876b5785c342329e87016fc2d687298d58db2ca227ea6660d36d7f5. 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/QZK6J2205890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefc1d45c5769f5d6cc2f6aaca5b8dc8304879cf485cb2cfa90cdb916c844366a. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZMEP2255215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c0579ff8dffa745976fa8eb0b35c10a686c95ac5feec4cb3d1c827d9495ab96. 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/CA62E2501101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43245dd1e4d517b05ef15eefdfdc2582b152ae0e9ab5d690507274756e3c296d. 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/CA62E2501126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b4524beac92da60df13accd736fb6f4b69df80d68aa38d7c3c4fac59f37d242. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/USHM91362867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6891bc21669427463b4d414925e224c77b5577191779ba06513c06f788fa649. 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/QZK6H2375526.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fceca2f3a9cb0c1bf39a2cf68ac995e1a681625ac93db4105272a00a5fbdcb1. Chain 2 (Bitcoin): anchored in block 960456 (2026-07-31T19:53:57Z), 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/QZDA52259743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5f2533dbcbe47bbdbd4bb421d1646ba6f2d676c428902a87e6a46e7a3ec0a0c. 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/TCAGG2279458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x542ee11bcacd6d40b86d43a3b609dca73c8380073dfd156dedfd645a0cd8d121. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/SEYOK2304740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a79e0ea6b58660a2833e777962d66a48b322c45cd34dcab6fe974c7343d0e4a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZMEN2267505.