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 0x3e04fb72675db637a9e661ae04bae28a813a83a4efef19d3865cee7cc0ad9a02. Chain 2 (Bitcoin): anchored in block 953780 (2026-06-15T12:02:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d38b974d-bf13-4885-b182-50899d4d9a60.json and https://artists.proofprofile.net/proofs/artist/d38b974d-bf13-4885-b182-50899d4d9a60.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 0xdad462584ab16f0254b4b54e43f6afcb688f217997ef5c5be639080775db07fd. 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/QZNWS2380660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c206b7648e60044e53c48588153f060b76bf9cd1e6c38c6ec725dfb30795930. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZNWS2380661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x078ad7b2e3a31f58e06a3080af528ac80f5eba9d655e7b3fc95a7ffd64d705cc. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZNWS2380662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ab7ffd1f36716890c133493f2d908a5f41342373dd8dcf48675a33575dcbe32. 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/QZNWS2380663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8efc6c04e921a9fb70221a90fcbd14e098717a55a307ac9b9ae9e586df08437b. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZNWS2380664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfeaafdc55e58000d91aeea981fb607ded3f7547b6d06a50498fae13882db68d. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/QZNWS2380665.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8642fbf76dcebb16168a7c86e096133a973553414b5bcc4597fd7fcf3448dbf8. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZNWS2380666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99dc7d9279c118ed49baa61f3c43eddb013bed85c57f3215b09f1cf66e4013e5. 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/QZNWS2380667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e74ef7c8f27855a9b5d17f3200213001541391c00c207aa22e5232c751d0f89. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZNWS2380668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3513b218bde6c3f8cd86e99f60053a4e3ed94e3a7a10d03fb0bccc635967031a. 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/QZNWS2380669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81bbcc404f83901123e6baf15af2f70401f6489132e13983ea4fb8b42a0ee79d. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZNWS2380672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f0c4161cdddeebeba812c37c023409490931ef9a2af5d9a870ee6a8aa60159b. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/QZNWS2380678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963355a0c5bf55b7d1a453853d1c9bd4595b63d76ee753b693956c9d040d4efe. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZNWS2380680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1aeb5921db7cfa30288178bffb67d0778643dc8f6c4f35aba4372a4bb006dbb1. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/QZNWS2380682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e67711e141167930087c559be9825c1641b8eab90a255c6370edfdb65354a55. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZNWS2380684.