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 0xdc8db1732a2d439fa71453afd9a1f145353c1d816a7e44b72230339b3a857100. Chain 2 (Bitcoin): anchored in block 953754 (2026-06-15T06:45:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/aff4c613-341e-46a1-974b-9626786b7f3c.json and https://artists.proofprofile.net/proofs/artist/aff4c613-341e-46a1-974b-9626786b7f3c.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 0x2f7f1e223deaf7696135a64c4f5917b3c080aa051d3ce2926c6188027a52b22c. 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/CHG472400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28452963dbf1192fa8b72970902c0f4c8b94ae6b9e9da9401b1e51c45fd1bc1e. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CHG472400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7f1e223deaf7696135a64c4f5917b3c080aa051d3ce2926c6188027a52b22c. 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/CHG472400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21bea38d49b0f012d7acdff5ab74668819988895b1a1cdbe3a60b14b7f3ef343. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CHG472400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x128881c9ca8ce82449000219ab353e02e895e08ed86f0119822af58817021a77. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/CHG472400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x531d2f1cfb20ff7be26951aca17bfd57cdb0642050722f72192358422bfc7d58. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/CHG472400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a6e273e05008c1075f698ba60fb6f7cb41e337dff93473c3b90976a584e1c50. 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/CHG472400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd630513c2a1fd79202ca5b56d8d82d880a46f6a814d5d49cfa386d1e52c2e2c5. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/CHG472400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ab299cef1512de2ea5808e7dc3f93ecbc4dfbe803b792d4c9c1e95428c356d. 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/CHG472400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc217ea9ae280dda9b1882bbafddfcf60aeef4eb53eb83404ad89f9e584f6550f. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/CHG472400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1747e69c3b14dd3a3a78e6c2b811e2e17f2d556c9d3e08ddc417e9b3ee5f1c73. 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/CHG472400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925a116c22ee939e144cf4b80ff09a6a2fd8077d87cb91c9c804fd64c58ac254. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/CHG472400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe55361f5c9c2b78a75db9f472791d2f0d5bb2bc3c4fa493af3e5db5d501645bc. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/CHG472400014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9e2d9e714edee7cab1c7cb073e4720c4936860d53254ed267abc6ac3ceea11. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/CHG472400015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ed3fb412908b8bb660367971fdfae3398118d4a20eb4be5eac8cd1ae373dbe9. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T15:07:00Z), 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/CHG472400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c6d1a8dcc9f13913dfa82c10f5a329f99697b9ba119ff0a284deefcb5e07108. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/CHG472400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf14990b61e867b90860bd0bfbebe2b296fa2169ca6fcafa98daa499e13e3c34f. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/CHG472400021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc63972678ea652aaab17bbafc36d1843f248c5a56cb64d2291c683a216091d84. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/CHG472400024.