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 0xf87794fa60d1718ee7b9434f54b21362f5932b4bde8d2be66cfe90b25ce84e74. 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/e045ebdd-c42c-4cb7-8f70-9dfa9d57306d.json and https://artists.proofprofile.net/proofs/artist/e045ebdd-c42c-4cb7-8f70-9dfa9d57306d.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 0xba0176aee163a2d95b5c5043445e2dc8540e40f728c314c67d5deb1e9a7c9a7d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QT3EZ2492962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27193527c988c2d87cb21ccd0d0ed4733e3e20d97911638f21eb341236ef15c7. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QT3EZ2492967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19bb5feadc658b527173d32d67186e92a29157c5342fe5c4534250d3d24b34e6. 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/QT3EZ2492969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea2853822da7dc698da384883edb0d1fe2b695a8a49e6719287bfba82b9ba51f. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZFZ22582022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e65ff9b89cf5c2af0014285eaa8202ee0ee63fd3030b4adc291378e48f7086. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZK6F2563295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dc3d8e66a4f2cff764ec0a7dd28d8a13ea0a532f8c4cb49f176e6a17fe2e37e. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/QZK6F2563300.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b889bb817ec190cc92f25f12f794a588d6a9fe98287a49a046f130fd1646bc0. 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/QZMEN2523558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f6098b1101ff6deaa7f8f2c9d2728e5055a240aff4e4f89ae295877a3b2c968. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QZTB22516734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc55206270ab6ba71610a31531d605c2611fa78a4c986f15af10f9f9ab756cd6. Chain 2 (Bitcoin): anchored in block 958802 (2026-07-20T01:04:02Z), 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/QZTB22516735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe258cc8c3053bd4f71fa65e388a0fff247a4699cfd80f2dd0e728b19a9ff1a3e. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZTB22516736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x955dfe4c69b81357adc76c8bc57968637c0556625de11432418f46f4dafea8db. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZTB22516738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931a3017b1bcf4d9d9c3f0462daa1a4097efe87a32bab9cd39a0654b26a46e4a. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZTB22516739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00cf3a4986989f10d6de7ff2e67cb01d92604c6e444a103525c09e984a779eba. 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/QZTB22516741.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048b5dec5eb465e3f7af75914bcacb712eca18983608760da05ed824e462dc19. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T07:01:59Z), 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/QZTB22516742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58ab4f1fb5241f36bbbd015d9f6fb0737968f99448ab5e7e66d051537a5ea4df. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZTB22516743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e5f71f36497480845c45b45fb846a39852f3b1cb06b0df3fed255cfb02ff25. 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/QZTB22516744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb2cde28d3fe881965da61c7a7dc087ce78d019cc258cb136e2a01ce4f27155. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/QZTB32574311.