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 0xbff95cb9bc9e42215bca272a256eb12330dcd6a8cbde83b13efd37f6bc790a41. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d2e33dcc-dfa4-4b9b-a742-33dceed3697b.json and https://artists.proofprofile.net/proofs/artist/d2e33dcc-dfa4-4b9b-a742-33dceed3697b.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 0x480ee22dc73cf4b30022e15bc6cd0f1572cc5cfbbf0e9673c61c4f5efde88237. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/US7VG1751266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x684e4f63bc7efae2bee677f4b29b268d83a7712e556828ceba5aad558cc73c41. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/US7VG1751267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2cfcafc7f419203cad8e97f562445785cb093f6bfaf4ced63e61a832d2543a. 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/US7VG1751268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5e10e2273ef53e5cfa41d38378ea215ac9f3dac5554328c195e6f43ceb8ea7. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/US7VG1751269.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8cb74e1e9bdfa8b3489e24f3429f497fbdc68fbaef9d7daba5cf1264af554a. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/US7VG1751270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16c24b4be75a6c7855f7c8182dc6312d2b6dcacf485ef98506707c777ae2d3c2. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/US7VG1751271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8efa387303f3fb6683836924a9fee75bd8e21ab7b5c003feb53a611d3a26c8da. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/US7VG1751272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a6030e83195fc84fdc780f405adec0cc3c49a75de08c190a61467088431183c. 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/US7VG1751273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188e8420ce5d1502f4402572834897cca866a23b5a82cf9ac4ce8bb2f552b146. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/US7VG1751275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50ed3a5a26b5c61196f610a76b0f04cb2d8c27cdad6a5197e0d944451f85f708. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZW9K2207629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99ffbb3c014b45da080e518dc1ff0350fcf3494ed1ed7c00bb8c3baed30ccba6. 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/GBLFP2167706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a4297e7a806dd7c57b95f3855aaef5ef0ef69250733641ddf7dc722bc857d09. 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/QZGLM2088440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb70e75765a336a9e6894604cef98a98fda051dd952c7e8f4e183e061c0e5489a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZGLM2088441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95219843017fff84369010715a62615b47978c8b24e6cac4418dcdf2d1d5b5f0. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QZGLM2088442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747999e75b72f3147358bda78c286cb2f4f4e272f4da2375af16bf636a8ffd35. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/US7VG1967720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x657b87fd7de61d01c939493e8d2789d84686f1bb73eee932d79e5c77c814f50b. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/US7VG1755330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb24fde63f86722c830a1bf0db4c4b0fc13d4ceef679b41afd13b9bfd0cc97528. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US7VG1751261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4ac1c5203672ef92deb566371865c495a395d9224786b0f75e6b22414129f46. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US7VG1751262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58188556baef812a380e60fc169c791672ded85437ad5291b4e76d6cd45c378e. Chain 2 (Bitcoin): anchored in block 957249 (2026-07-09T02:31:37Z), 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/US7VG1751263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x543521b37a075cafc7e23cad9bbf6d2651b912abdb8d7c78a9a9673a05c2cba2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/US7VG1751264.