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 0x428bea89b0067783ce7730d4b982ec7fed46161737d2e9a101cddd9d594d14a3. Chain 2 (Bitcoin): anchored in block 954513 (2026-06-20T06:31:18Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9e8ffd2d-5ac3-4b39-a32d-66aca839958f.json and https://artists.proofprofile.net/proofs/artist/9e8ffd2d-5ac3-4b39-a32d-66aca839958f.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 0xbcfea7a5bde6e73e4bc8b0bf7d71818d55c28030a72fecb02ebc7e6bcca762c2. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/PLC062114570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a8fa33c835e63e05ccdc4e9d5e06830ee088c0ef1f9eb199f9a4ef8630cab90. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/PLC062114568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf9bf63b188cf20be386ccacc9ba1e95a0e81c2ee3f96d3497fbbcadcc690ca6. Chain 2 (Bitcoin): anchored in block 960177 (2026-07-30T00:21:01Z), 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/PLC062114574.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3979272e39175aee92e52c89c4f5eab2b3c33e82b5a2a2cb9fd4f91c932de472. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/PLC062114566.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x603501bc0eb9c51d1cddfc2340705b00e5396f93502422eca773449bc2a80e0e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PLC062114576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36cb1dc12448ae47ea75c873563c506f4a20ff2a68731af72b5d6e1248c33003. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLC062114572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca7a9bb07e7896c3e36b741dfecaf0d4d04221d0f17067893dd21bfd269bfa95. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/PLC062114602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ce9f31b67ac62ccc6e8f1a55679c10a935bcc3520657319d7c5cf124870a313. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/PLI366767120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa59ae4a34ca5d5c01fb29af3068e4ed743380f24cae26de4b1160cfd2d697059. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLI369876960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1078b6173382bff5fa77de2b7a02c27395d508f68b64388957138dd3408f0322. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLI366767170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a9cb840c9cff652d39819fbbe1e8feb207245d67c578dbd1f141b734765244. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PLI366767230.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b922df29af53bbf6ecb5ee6498db2691e0bf8f5902a87bad912bd0315552a9. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLI367659550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcdf97c65684ccc158c1b9805f5dbbb88b0d1de4ba44d930c16d59cf4995d236b. 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/PLI369046900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d86e8e98fb06b498c428f305ab13515c0cbbfdc28460c7eb5f99883d6b85f29. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PLI362463080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec48508fe57eff8dbd5667ac7a92bd81fa348cd88da0713ed6874e416edc9917. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PLI365926400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea553ef579d3d92117d776fb56fdd37d4c52929223dbccb92d9171d6991b426d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/PLJ921800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffea7ac9beecaf61931f10dced886e3d37fd731614dd85a11cc9f2c720720fbb. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/PLJ921800012.