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 0x66101c7845923edfc11784bd5205eaa43a6151ea068c608e9faa975bbbfe53ed. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b2e2dc7d-f319-47df-9397-63128461d080.json and https://artists.proofprofile.net/proofs/artist/b2e2dc7d-f319-47df-9397-63128461d080.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 0x734273d4c740387bc90c82a9f3fefd769719f26fcca439893c07349afd7723c2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZDA42111549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x737ec4788cfc6c1e48d9c77db8038fb1a6a731fdaf983c2376ad4a0694469540. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZK6H2069139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2899418adb47490be175bffd85ee2982fa9442d2e905304050661bcc4b97875e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6H2069141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc332e5fa8cd6b2a46bd2e1f308a501189b6b2a26e86f090c156917f1df1acda1. 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/QZHN42097355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd600eeded313207671388356a5894fb1a7173ca1d0948d21ae0b8354701d777c. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:39:10Z), 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/QZHN42097356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e61b61bcf63247fc15db4ae66b001d79c922ed928f6df7c18127a39fff844d. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QZNWZ2154443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa00e55d1d76807c9fbca602bd3c33a9dcd4f9d425d5b8f07c18898311593a1e2. 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/QZHN32243698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4db7765bcebb0f4555699b392df0cc29fde7a0eff20037ef5d4a0b8d8d2c2865. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZMEM2290796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3e97f9f4639ace1f4370c8e453fd686d076a4d7dfe43313e2d15ec52205149. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZMEM2290797.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc42170dcc2fed84ee2b35892e6ad23b25c8485df15dd41e1fd196c80beb7741a. 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/QZMEM2290798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1489a2f0bc797733ecae6f3db2d8023697d93e52dd5278a0da449e3ffbd34a3a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZTAU2236837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb4a4767d047bf707936e886091835054d304ddbe3c38fa0d6401bb6d8658740. Chain 2 (Bitcoin): anchored in block 958689 (2026-07-19T07:11:11Z), 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/QZES62444311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55d0054076ae8c1a6b757f1535112e3ee1f0287e138acbf7b8b1eee9fa7621f. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHN62425530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde305ddae710659342b5112410ad093fa21fcc20b4d3723b98655cc1e9668bd4. 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/QZHN62425532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4483a3412a7fb298501d52f8c74f5a341beea972f45b92eee54ddb95c711d8d. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NL2BN2300021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8091ec4cd60f3735ef293c3580bd6d0083be26278e8eaf207c2966bd6e94c69. 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/QZWFT2473396.