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 0x31745d866e6ff701628cebea1262a2073b9f4784604ebe3ec6a0b9e77523c1ba. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/82d6fbe1-2f37-45b5-8f4a-437abbefd45f.json and https://artists.proofprofile.net/proofs/artist/82d6fbe1-2f37-45b5-8f4a-437abbefd45f.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 0xca3771f0c44993d14c52c388b04dbdb9dc96960eb891deef8c78256d6a1eccac. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ITF732100533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac98dbf2483e6a773e9a80b7d8dc84aa8957be596cfae4862b4d7c7f8c52b343. 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/ITF732100534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb62f75fda274735bb021a9b7823a1d306bc39d6b3b0778ba261927d518fd64. 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/ITF732100535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd68b53729a8e5027daf6a6f794c747ab01f5e5350b19ca3c98734bb94072308a. 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/ITF732100536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x970035d3a9bed07eaf2b966003cc6dd142b6820c3b00dd39730ecd02976a379f. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/ITF732100537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cb7d80a20f30881c7d94a4f6576b78302be2bc9a07914633a8721e89047bd7c. Chain 2 (Bitcoin): anchored in block 958696 (2026-07-19T07:45:31Z), 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/ITF732100538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14db4a3983ed228ee1283a51334fc60893cc6aa8be5a03a349cbae01a376f477. 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/ITF732100539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5c164ad6e61564cf7255f4891d11d715b6cddfd10f78f15040f36f6d36d8bbb. 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/ITF732100544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d388d09c718d8e60702ef254113ed46d0f5df2e77d35b119a6974fd082ff73a. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/ITF732100545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc195ada0643112d06d703e19c3878365a84455e0816bf4094e9d1a6ffba24db7. 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/ITF732100549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f83e729999018049a064f0a25dabaca8cda38a786e36ea7e16d2e7a8977710. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/ITF732100551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x099d2ac3a3f311b6297f28febb6b0b534f2df270fd374fccc806817f5fe0a8c9. 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/ITF732100552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c91915be66850bb3b57f92ab8e962f5c3eab58dd41e98f5fad4415a694e697b. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T16:28:12Z), 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/ITF732100553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda9933f5f19c971eda690645d8f45b4e7c4939befc577587e27280e28e1d8211. 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/ITF732100554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e0e885da1ede687412814a27cb92fc2714d21fac5ecac9ec0d75656e35b8c43. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/ITF732100555.