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 0x18c48ca836c10751712230fc09e67329961026b1da49b8e8128ff3d874c0860d. Chain 2 (Bitcoin): anchored in block 953772 (2026-06-15T10:33:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c93ef912-39c9-440d-801e-62337d9f93fd.json and https://artists.proofprofile.net/proofs/artist/c93ef912-39c9-440d-801e-62337d9f93fd.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 0x314aa1b22f1e313cf3ff60c852f284de8880ee79d0f4f68c421756c882f89046. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ITAC31001002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860cc522aff86c5d05d5489e08e1e1c18acbdc5081f9882f6875862e94f6f790. Chain 2 (Bitcoin): anchored in block 958487 (2026-07-18T03:43:59Z), 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/ITAC31001003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe10f45851748f903e9a5074794ab282418db7a1a217e8cba067eefa3e2e023a. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/ITAC31001007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547a3e6d2a5f8d9ef0b8ae00ed6ad55313360172446b8696a1a5f35a1419197e. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/ITAC31001008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24aae81a2698a6caea849a651dd3fb3c1b456ed1fb1a921d6713c9f3775e977b. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/ITAC31603502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc659a4473f79de1a67fbe6a50600b1878e83a0be55b5694c988f55975b4f3248. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ITAC31603503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc001c1fd5aeb3ea77adcd4b0ff8cfebe9186d2115d741e9e764c2f66f5004ad9. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/ITAC31603504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefa813ff37c50c75407aa624dc8dc366030086308d28a4101d788e415c5af2eb. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/ITAC31603505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b32450aeef68f6fcf8fb39a114353a05baa6a409e61708a610366339787f49f. 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/ITAC31603506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cfbe53c314417ba74a5d58351f7533a34e9ecceb14e2361827ff8da9490af06. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/ITAC31603507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7005282c0d85661b9fd4ac43276f8e54e9f11cb1d521ee63077a2a1e275f74c7. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ITAC31603508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1733ede9f007f4c9c569043cb83e2de830a63b78bc9527fba367d9ab17762ae. Chain 2 (Bitcoin): anchored in block 958733 (2026-07-19T12:51:21Z), 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/ITAC31603509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba3bea7da64889027708c5b0b257ad55485ebd2180395d6ff748741398e6004c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ITAC31603510.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e11bec5215bd3883dbd31f95142e4f204bd6afefd0ede430a7da62fb244b52c. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/ITAC31603511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b8c436a139abd5fd4c0069e4c745720617647348049a792ee610bb6dd78cdea. 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/ATAV62000120.