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 0xe3d19f50a30385138f52efcf7924f24ad200ee0f900f2537dd05aa163c364c48. 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/2463e66f-8b81-4888-93fa-897c2ec4d62d.json and https://artists.proofprofile.net/proofs/artist/2463e66f-8b81-4888-93fa-897c2ec4d62d.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 0xeb9cf999ec84fee63b5742e6a02ce2b4038504ff648e4075eedb16357ccd3df1. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/JP92N2359737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe570443be0e2c88472d63826ec04bf4999be42331facb4fc6745c0055f8761d7. 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/JP92N2359738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb093e26200764607856340f78ef9a43584d7a0bcba926a0b04669ce436780f86. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QM6N22437218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1bbb6cb85aa01e87568f25a13d2162333bfd4caa30161735229e94248005d9a. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QMDA62453033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0c74e48ed329788bde99bcdb68f9a558122ea00303110292f675007e03b8ec. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/JP92N2252966.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55b611667e2e303fa7ac5f09d580c082f6dfeaaad92c483403e979732de0402. 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/QM6P42404469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb9cf999ec84fee63b5742e6a02ce2b4038504ff648e4075eedb16357ccd3df1. 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/JP92N2359737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe570443be0e2c88472d63826ec04bf4999be42331facb4fc6745c0055f8761d7. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/JP92N2359738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99d343bcdcc2ed632b04246fd305606ad48ba4e2d97e11fedd9818f1de90d94a. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/QM7282410233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cc7a32c115ca26f7f3d3b2e564c6d97e6befbf35f15edd3adaff7cf98bcd976. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QMDA72455181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54bcf1bf76e61a1ca8f40b521bc81d8199de8846c6535d2f59bdda3c56058fd7. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QMFME2407377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645e7f9baae10b59706779386f64ac70891dea765c995ca7a8c5fca38a85c6f8. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QM4TW2575043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b87656151601bb209e3db2868daae3b26eed74e32de5c4db0fee66ad099e143. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/QM6N22548850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x433369afcd061f3f6963654f43c5a356491e70e53fe8f7d6ef2ef5e4612415bd. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/JP92N2428733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6792417b1dd6823d2ca84e5c059765a17751db4fac4d3edc508a1fb486226293. 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/JP92N2428729.