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 0x1fa9919596e22a2d3b0d9f4c330d3b0720bc0f6bbf011214372d9cd080c29803. Chain 2 (Bitcoin): anchored in block 954027 (2026-06-17T00:55:08Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/398e5d75-6b7d-4afc-809c-bb3ce3d014c0.json and https://artists.proofprofile.net/proofs/artist/398e5d75-6b7d-4afc-809c-bb3ce3d014c0.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 0xbb240c19cf3c86cb2d78daf9741aad7b38c71d8fd6b25809f889cdf34f9b82dc. 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/QM24S1902280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70b73abced6f25ba6722849c1578461cdd32d8c2333f586b64b1b80267678eda. 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/QZH5E1966478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc444c4ab662961dc1c8d898c002fc68fbcbcc4cdfd2d8f39e4c04e1470184247. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZH5E1992981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb0ff5f7cfa3946b4b30619e0240637dc700f7379c942847d24359dd67a07788. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/QZDA82107596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60099f7025068430a69e00bb41ab18ad9be3c0d0b89bb976f826547d000c95c4. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/CA5KR2134491.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2952c91dfc1681f3aeb9eb15bfaa22b87d4699f55b4fc384bdb3ec4a9c5cafa. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USA2P2044780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x638cf729e864b37be70a1adfe7fee5c387f95c3161889a268b9e8871d6e88e5e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/TCAEW2007870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddc2f8a214068f78cf3e6a2cd1c83d77b14ef1531dfc3604a75ad153be94b4ea. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZFZ62048195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7f14a811fe0fa34497a3bbc3c7a63e554329077dcfd9031675d9abb0f993ff. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/QM42K1956655.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba1e8944b7d9fa0f408552645d72317e067225be876858bb5cf3e9d9725e061a. 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/QZHNB1984111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18099d17aee39df2482c7f758e778f7ab40ae75230ca298158a6cd04d1c57f5. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QM24S1918527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e0c9f3385e61a2309932961f09cd8cbf868c1b9a8cc222babdbacbd7de071c7. 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/QZFP52119308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91a56d4b4769c010d3a21e9fcb657cbcb0b3f5adcbc301f445e7eecf83ec5299. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/QZFP52119305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b10b5b8a11927fcb64b16d1d47b2364607522bcc644b207cbd4b14b5a57d9ec. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/QZFP52119303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x654d11fe541319fdc1de9746e515470c39f62fafedd4b90e990f9a084d53ea0f. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/GBLV61911964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa6791e6d07bd1be1ea65e3d1364bf453e5560aa710b153903fdf8c0c4de5dd2. 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/QM42K2031901.